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Optimizing CuO on 3D Ordered Macroporous CeO2 for CO Oxidation in Rich Hydrogen 认领 引用
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作者 Xiaohua Chen Guoqiang Song +5 位作者 Fangfei Liyan Claudia Li Wenxia Zhou Feiyang Hu Lei Gong Sibudjing Kawi 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期841-852,共12页
CO preferential oxidation (CO-PROX) in rich H2 is considered a feasible strategy to solve CO poisoning for fuel cells,but obtaining good activity at low temperatures is still a challenge.Herein,three-dimensional or... CO preferential oxidation (CO-PROX) in rich H2 is considered a feasible strategy to solve CO poisoning for fuel cells,but obtaining good activity at low temperatures is still a challenge.Herein,three-dimensional ordered macroporous (3DOM) CuO/CeO2 catalysts were fabricated by a templating approach,with the metal-support interaction (MSI) adjusted through active metal loading.The 10CuO/CeO2 catalyst achieves complete CO conversion at 110℃ and demonstrates excellent stability.Characterization studies have shown that the 10CuO/CeO2 catalyst has abundant active sites and oxygen vacancies;this phenomenon could potentially be attributed to the synergistic effects arising from the MSI between CuO and CeO2.Moreover,in situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) were used to identify the intermediates and confirm that appropriate MSI enhances CO adsorption and activation.The findings of this study make significant contributions to the advancement of 3DOM CuO/CeO2 catalysts for CO-PROX and establish a promising strategy for optimizing the MSI in supported catalyst systems. 展开更多
关键词 CO preferential oxidation CuO/CeO2catalysts metal-support interaction ordered macroporous structure rich H2atmosphere
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Br-doped CuO promotes water dissociation and enables efficient asymmetric C-C coupling during electrochemical reduction of CO2 to ethylene 认领 引用
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作者 Canyan Yang Wei Liu +6 位作者 Zhao Zuo Jinhua Xiao Huawang Zhao Bihong Lv Zuoming Zhou Xiaomin Wu Guohua Jing 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期261-268,共8页
Carbon-carbon(C-C)coupling,the rate-determining step in electrocatalytic CO2reduction reaction(CO2RR)to C2+ products,has low efficiency and poor stability.It originates from an ineffective water dissociation ... Carbon-carbon(C-C)coupling,the rate-determining step in electrocatalytic CO2reduction reaction(CO2RR)to C2+ products,has low efficiency and poor stability.It originates from an ineffective water dissociation capability and a high energy barrier for the C-C coupling pathway on existing catalysts.Herein,an efficient and facile Br-CuO electrocatalyst was synthesized to promote water dissociation and achieve an impressive Faradic Efficiency(FE)of around 60% C2H4 at a current density of up to-350 mA/cm2 with stability of 16 h.Combinative theoretical and experimental protocols strongly evidence that the architecture of Cu0-Cu+ sites is crucial for the enhancement in CO2 RR activity.Cu0 activates CO2and Cu+ strengthens *CO adsorption to further boost C-C coupling.Furthermore,Br doping can facilitate the dissociation of water to generate *H,which promotes the protonation of *CO to *CHO,thereby enabling the low energy barrier asymmetric *CHO-*CO coupling.The in situ ATR-FTIR and Density functional theory(DFT) was analyzed to explain the reaction mechanism and pathway.This study elucidates the critical function of water dissociation and provides a promising avenue to efficient CO2-to-C2H4 electrocatalysis. 展开更多
关键词 Br-doped CuO catalyst Ethylene selectivity CO2electroreduction Water dissociation
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Catalytic Oxidative Properties and Characterization of CuO/CeO_2 Catalysts 认领 引用 被引量：8
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作者 蒋晓原 周仁贤 +2 位作者 袁骏 吕光烈 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2003年第1期55-59,共5页
The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that eith... The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that either CuO or CeO 2 ac tivity is quite low for CO oxidation. However, when CuO and CeO 2 are mixed, the oxidative activity of the catalyst increases significantly, probably owing to the valency status of copper species (Cu 2+ and Cu+) on the CeO 2 surfa ce, the dispersion and reducibility. XPS surface analysis shows that CuO loading is very important in forming of either Cu 2+ or Cu+. Rietveld analysis s hows that some CuO, which has smaller ion radius than Ce 4+, enters the Ce O 2 lattice after CuO and CeO 2 are mixed. When the CuO loading reaches 5.0%, the size of CuO crystals is a minimum (6.1 nm) and the micro-strain value i s a maximum (2.86×10 -3), resulting in high surface energy and the best ac tivity for CO oxidation. 展开更多
关键词 physical chemistry CuO/CeO 2 catalysts CO micro-reactor GC system rare earths
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Promotional effect of CO pretreatment on CuO/CeO_2 catalyst for catalytic reduction of NO by CO 认领 引用 被引量：14
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作者 顾贤睿 李昊 +3 位作者 刘礼晨 汤常金 高飞 董林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第2期139-145,共7页
The CuO/CeO2 catalysts were investigated by means of X-ray diffraction （XRD）, laser Raman spectroscopy （LRS）, X-ray photoelectronic spectroscopy （XPS）, temperature-programmed reduction （TPR）, in situ Fourier t... The CuO/CeO2 catalysts were investigated by means of X-ray diffraction （XRD）, laser Raman spectroscopy （LRS）, X-ray photoelectronic spectroscopy （XPS）, temperature-programmed reduction （TPR）, in situ Fourier transform infrared spectroscopy （FTIR） and NO＋CO reaction. The results revealed that the low temperature （〈150℃） catalytic performances were enhanced for CO pretreated samples. During CO pretreatment, the surface Cu＋/Cu0 and oxygen vacancies on ceria surface were present. The low va- lence copper species activated the adsorbed CO and surface oxygen vacancies facilitated the NO dissociation. These effects in turn led to higher activities of CuO/CeO2 for NO reduction. The current study provided helpful understandings of active sites and reaction mechanism in NO＋CO reaction. 展开更多
关键词 CuO/CeO2 catalysts CO pretreatment oxygen vacancies NO reduction rare earths
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Preparation, Characterization of CuO/CeO_2 and Cu/CeO_2 Catalysts and Their Applications in Low-Temperature CO Oxidation 认领 引用 被引量：9
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作者 郑修成 韩东战 +4 位作者 王淑萍 张守民 王淑荣 黄唯平 吴世华 《Journal of Rare Earths》 SCIE EI CAS 2005年第1期47-51,共5页
CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were ... CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were examined by means of a microreactor-GC system, HRTEM, XRD, TPR and XPS techniques. The results show that CuO has not catalytic activity and the activity of CeO2 is quite low for CO oxidation. However, the catalytic activity of CuO/CeO2 and Cu/ CeO2 catalysts increases significantly. Furthermore, the activity of CuO/CeO2 is higher than that of Cu/CeO2 catalysts. 展开更多
关键词 catalytic chemistry CuO/CeO2 catalysts Cu/CeO2 catalysts carbon monoxide oxidation rare earths
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Local structural evolutions of CuO/ZnO/Al2O3 catalyst for methanol synthesis under operando conditions studied by in situ quick X-ray absorption spectroscopy 认领 引用 被引量：5
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作者 Xue-Ping Sun Fan-Fei Sun +5 位作者 Song-Qi Gu Jing Chen Xian-Long Du Jian-Qiang Wang Yu-Ying Huang Zheng Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2017年第2期35-43,共9页
In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for met... In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for methanol synthesis. In this work, the catalyst, whose activity increases with the reaction temperature and pressure, was studied at calcined, reduced, and reacted conditions. TEM and EDX images for the calcined and reduced catalysts showed that copper was distributed uniformly at both conditions. TPR profile revealed two reduction peaks at 165 and 195 °C for copper species in the calcined catalyst. QXAFS results demonstrated that the calcined form consisted mainly of a mixed Cu O and Zn O, and it was progressively transformed into Cu metal particles and dispersed Zn O species as the reduction treatment. It was demonstrated that activation of the catalyst precursor occurred via a Cu^+intermediate, and the active catalyst predominantly consisted of metallic Cu and Zn O evenunder higher pressures. Structure of the active catalyst did not change with the temperature or pressure, indicating that the role of the Zn was mainly to improve Cu dispersion.This indicates the potential of QXAFS method in studying the structure evolutions of catalysts in methanol synthesis. 展开更多
关键词 In situ Quick X-ray absorption spectroscopy CuO/ZnO/Al2O3 catalyst Operando condition
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Effect of yttrium addition on water-gas shift reaction over CuO/CeO_2 catalysts 认领 引用 被引量：5
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作者 佘育生 李雷 +3 位作者 詹瑛瑛 林性贻 郑起 魏可镁 《Journal of Rare Earths》 SCIE EI CAS 2009年第3期412-418,共7页
This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 cata... This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 catalysts with yttrium content in the range of 0-5wt.%. Properties of the obtained samples were characterized and analyzed by X-ray diffraction （XRD）, Raman spectroscopy, H2-TPR, cyclic voltammetry （CV） and the BET method. The results revealed that catalytic activity was increased with the yttrium content at first, but then decreased with the further increase of yttrium content. Herein, CuO/CeO2 catalyst doped with 2wt.% of yttrium showed the highest catalytic activity （CO conversion reaches 93.4% at 250 ℃） and thermal stability for WGS reaction. The catalytic activity was correlated with the surface area, the area of peak γ of H2-TPR profile （i.e., the reduction of surface copper oxide （crystalline forms） interacted with surface oxygen vacancies on ceria）, and the area of peak C2 and A1 （Cu^0→←Cu^2＋ in cyclic voltammetry process）, respectively. Besides, Raman spectra provided evidences for a synergistic Cu-Ovacancy interaction, and it was indicated that doping yttrium may facilitate the formation of oxygen vacancies on ceria. 展开更多
关键词 CuO/CeO2 catalyst water-gas shift yttrium cyclic voltammetry rare earths
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A comparative study of CuO/TiO2-SnO2,CuO/TiO2and CuO/SnO2catalysts for low-temperature CO oxidation 认领 引用 被引量：10
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作者 Kairong Li Yaojie Wang +4 位作者 Shurong Wang Baolin Zhu Shoumin Zhang Weiping Huang Shihua Wu 《Journal of Natural Gas Chemistry》 2009年第4期449-452,共4页
Nanometer SnO2 particles were synthesized by sol-gel dialytic processes and used as a support to prepare CuO supported catalysts via a deposition-precipitation method.The samples were characterized by means of TG-DTA,... Nanometer SnO2 particles were synthesized by sol-gel dialytic processes and used as a support to prepare CuO supported catalysts via a deposition-precipitation method.The samples were characterized by means of TG-DTA,XRD,H2-TPR and XPS.The catalytic activity of the CuO/TiO2-SnO2 catalysts was markedly depended on the loading of CuO,and the optimum CuO loading was 8 wt.%(Tloo=80℃).The CuO/TiO2-SnO2 catalysts exhibited much higher catalytic activity than the CuO/TiO2 and CuO/SnO2 catalysts.H2-TPR result indicated that a large amount of CuO formed the active site for CO oxidation in 8 wt.%CuO/TiO2-SnO2 catalyst. 展开更多
关键词 sol-gel dialytic processes CuO/TiO2-SnO2 catalyst low-temperature CO oxidation
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Experimental and Kinetic Study of Selective Catalytic Reduction of NO with NH_3 over CuO/Al_2O_3/Cordierite Catalyst 认领 引用 被引量：7
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作者 雷志刚 龙爱斌 +1 位作者 贾美如 刘学义 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第5期721-729,共9页
The CuO/γ-Al2O3/cordierite catalyst, after being sulfated by sulfur dioxide (SO2) at 673 K, exhibits high activities for selective catalytic reduction (SCR) of nitrogen oxide (NO) with ammonia (NH3) at 573-723 K. The... The CuO/γ-Al2O3/cordierite catalyst, after being sulfated by sulfur dioxide (SO2) at 673 K, exhibits high activities for selective catalytic reduction (SCR) of nitrogen oxide (NO) with ammonia (NH3) at 573-723 K. The intrinsic kinetics of SCR of NO with NH3 over CuO/γ-Al2O3/cordierite catalyst has been measured in a fixed-bed reactor in the absence of internal and external diffusions. The experimental results show that the reaction rate can be quantified by a first-order expression with activation energy Eá of 94.01 kJ·mol-1 and the corresponding p re-exponential factor A′ of 3.39×108 cm3·g-1·s-1 when NH3 is excessive. However, when NH3 is not enough, an E ley-Rideal kinetic model based on experimental data is derived with Ea of 105.79 kJ·mol-1, the corresponding A of 2 .94×109 cm3·g-1·s-1, heat of adsorption-Hads of 87.90 kJ·mol-1 and the corresponding Aads of 9.24 cm3·mol-1. The intrinsic kinetic model obtained was incorporated in a 3D mathematical model of monolithic reactor, and the agreement of the prediction with experimental data indicates that the present kinetic model is adequate for the reac-tor design and engineering scale-up. 展开更多
关键词 kinetics selective catalytic reduction CuO/γ-Al2O3/cordierite catalyst monolithic honeycomb reactor mathematical model
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Preferential oxidation of CO in excess H_2 over the CeO_2/CuO catalyst: Effect of initial support 认领 引用 被引量：2
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作者 Zhiming Gao Yuanyuan Gong +2 位作者 Qiang Zhang Hao Deng Yong Yue 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第4期475-482,共8页
Three series of CeO2/CuO samples were prepared by impregnation method and characterized by XRD, N2 adsorption-desorption, temperatureprogrammed reduction （TPR）, XPS and TEM techniques. In comparison with the samples... Three series of CeO2/CuO samples were prepared by impregnation method and characterized by XRD, N2 adsorption-desorption, temperatureprogrammed reduction （TPR）, XPS and TEM techniques. In comparison with the samples prepared with CuO as initial support, the samples with Cu（OH）2 as initial support have higher reducibilities and smaller relative TPR peak areas, and also larger specific surface areas at calcina- tion temperatures of 400 ℃--600 ℃. As a result, Cu（OH）2 is better than CuO as initial support for preferential oxidation of CO in excess H2 （CO-PROX）. The best catalytic performance was achieved on the sample calcined at 600 ℃ and with an atomic ratio of Ce/Cu at 40%. XPS analyses indicate that more interface linkages Ce-O-Cu could be formed when it was calcined at 600 ℃. And the atomic ratio of Ce/Cu at 40% led to a proper reducibility for the sample as illustrated by the TPR measurements. 展开更多
关键词 preterential oxiclation CO excess H2 CeO2/CuO catalyst TPR XPS interlace
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Stable CuO/La2Sn2O7 catalysts for soot combustion:Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support 认领 引用 被引量：5
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作者 Xiaohui Feng Rui Liu +6 位作者 Xianglan Xu Yunyan Tong Shijing Zhang Jiacheng He Junwei Xu Xiuzhong Fang Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第3期396-408,共13页
To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La2Sn2O7samples containing varied CuO lo... To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La2Sn2O7samples containing varied CuO loadings were fabricated and characterized by different techniques and density functional theory calculations.In these catalysts,a spontaneous dispersion of CuO on the La2Sn2O7pyrochlore support formed,having a monolayer dispersion capacity of 1.90 mmol CuO/100 m2 La2Sn2O7surface.When loaded below this capacity,CuO exists in a sub-monolayer or monolayer state.X-ray photoelectron spectroscopy(XPS),Raman spectroscopy,and Bader charge and density of states analyses indicate that there are strong interactions between the sub-monolayer/monolayer CuO and the La2Sn2O7support,mainly through the donation of electrons from Cu to Sn at the B-sites of the structure.In contrast,Cu has negligible interactions with La at the A-sites.This suggests that,in composite oxide supports containing multiple metals,the supported metal oxide interacts preferentially with one kind of metal cation in the support.The Raman,in situ diffuse reflectance infrared Fourier transform spectroscopy,and XPS results confirmed the formation of both O2-and O22-as the active sites on the surfaces of the CuO/La2Sn2O7catalysts,and the concentration of these active species determines the soot combustion activity.The number of active oxygen anions increased with increase in CuO loading until the monolayer dispersion capacity was reached.Above the monolayer dispersion capacity,microsized CuO crystallites formed,and these had a negative effect on the generation of active surface oxygen sites.In summary,a highly active catalyst can be prepared by covering the surface of the La2Sn2O7support with a CuO monolayer. 展开更多
关键词 CuO/La2Sn2O7catalyst Soot combustion DFT calculations Preferential interaction Monolayer dispersion on pyrochlore support Active O2-and O22-sites
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Ce_xTi1-xO_2 Mixed Oxides Supported CuO Catalyst for NO Reduction by CO 认领 引用 被引量：1
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作者 楼莉萍 蒋晓原 +3 位作者 陈英旭 吕光烈 周仁贤 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2003年第3期331-336,共6页
Ce x Ti 1- x O 2 mixed oxides of different mole ratios ( x =0, 0.1, 0.2～0.9, 1.0) were prepared by co precipitation of TiCl 4 with Ce(NO 3) 3 and then loaded with different amounts of CuO. The effects of CuO on NO+CO... Ce x Ti 1- x O 2 mixed oxides of different mole ratios ( x =0, 0.1, 0.2～0.9, 1.0) were prepared by co precipitation of TiCl 4 with Ce(NO 3) 3 and then loaded with different amounts of CuO. The effects of CuO on NO+CO reaction were investigated, and the structure and reductive properties of various CuO/Ce x Ti 1- x O 2 were characterized by the methodologies of BET, TPR and XRD. The results show that different Ce/Ti mole ratios and calcination temperatures induce changes of structure and reductive properties of the Ce x Ti 1- x O 2 mixed oxides. When x =0.1～0.5, amorphous CeTi 2O 6 phase mainly forms at 650 ℃ compared to the formation of CeTi 2O 6 which crystallizes at 800 ℃. When x >0.6, some TiO 2 enters the CeO 2 lattice and a CeO 2 TiO 2 solid solution is formed. The activity of 6%CuO/Ce x Ti 1- x O 2 calcined at 650 ℃ is largely affected by the x values, which is the highest when x =0.3, 0.4 and 0.9. The NO conversion reaches 70% at a reaction temperature of 150 ℃. By comparison, the x values have little effect on the activity of 6%CuO/Ce x Ti 1- x O 2 calcined at 800 ℃ . There are strong interactions between CuO and CeTi 2O 6, i.e., formation of the CeTi 2O 6 phase shifts the CuO reduction peak temperature from 380 to 200 ℃, and CuO, in turn, shifts the CeTi 2O 6 reduction peak temperature from 600 to 300 ℃. 展开更多
关键词 catalitic chemistry Ce x Ti 1- x O 2 mixed oxides CuO/Ce x Ti 1- x O 2 catalysts CeTi 2O 6 phase NO+CO reaction activity rare earths
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Effect of Addition of Base on Ceria and Reactivity of CuO/CeO_2 Catalysts for Low-Temperature CO Oxidation 认领 引用 被引量：3
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作者 Xiucheng Zheng Xiaoli Zhang +2 位作者 Shuping Wang Xiangyu Wang Shihua Wu 《Journal of Natural Gas Chemistry》 2007年第2期179-185,共7页
In this work, we have reported the influence of the addition of base （KOH） on the physicochemical property of ceria synthesized by alcohothermal process, and the alcohothermal mechanism was also put forward. Further... In this work, we have reported the influence of the addition of base （KOH） on the physicochemical property of ceria synthesized by alcohothermal process, and the alcohothermal mechanism was also put forward. Furthermore, the prepared CeO2 was used as the support to prepare CuO/CeO2 catalysts via the wet impregnation method. The samples were characterized by N2 adsorption-desorption, X-ray powder diffraction （XRD）, high resolution transmission electron microscopy （HRTEM）, and temperatureprogrammed reduction by H2 （H2-TPR）. The catalytic properties of the CuO/CeO2 catalysts for lowtemperature CO oxidation were studied using a microreactor-GC system. The crystal size of CeO2-A was much smaller than that of CeO2-B, and the corresponding copper oxide catalysts exhibited higher catalytic activity than that of the CeO2-B-supported catalysts under the same reaction conditions. The alcohothermal mechanism indicated that KOH plays a key role in determining the physicochemical and catalytic properties of ceria-based materials. 展开更多
关键词 alcohothermal synthesis ceria CuO/CeO2 catalyst CO oxidation alcohothermal mechanism
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Effect of Addition of Sm_2O_3 on Property of CuO-γ-Al_2O_3 Catalyst 认领 引用
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作者 蒋晓原 周仁贤 +1 位作者 毛建新 郑小明 《Journal of Rare Earths》 SCIE EI CAS 1997年第3期20-26,共7页
Effect of the addition of Sm 2O 3 on CuO γ Al 2O 3 catalyst for CO oxidation reaction was investigated. The result shows that the right amount of Sm 2O 3 can promote the adsorption of the surface oxygen and recovery ... Effect of the addition of Sm 2O 3 on CuO γ Al 2O 3 catalyst for CO oxidation reaction was investigated. The result shows that the right amount of Sm 2O 3 can promote the adsorption of the surface oxygen and recovery of CuO γ Al 2O 3 catalyst. Sm 2O 3 plays an important role in change of γ Al 2O 3 phase into θ Al 2O 3 phase. In addition, the right amount of Sm 2O 3(5%) can improve the oxidation activity of the CuO γ Al 2O 3 catalyst. Whereas an excess of Sm 2O 3(10%) makes the CuO crystal in CuO γ Al 2O 3 catalyst become bigger and restrain the oxidation activity of the CuO γ Al 2O 3 catalyst. 展开更多
关键词 Rare earths CuO γ Al 2O 3 catalyst Sm 2O 3 Oxidation activity
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Introduction of ZnO,Sn,and P promoters in CuO/CeO2 catalysts for improved production of dimethyldichlorosilane in the Rochow-Müller reaction 认领 引用 被引量：1
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作者 Xinyang Li Yongxia Zhu +5 位作者 Baofang Jin Yongjun Ji Lei Shi Dongxing Fu Dingrong Bai Fabing Su 《Resources Chemicals and Materials》 2022年第3期249-260,共12页
Developing an efficiently supported Cu-based catalyst with promoters to substitute the existing non-supported Cu-based catalysts is highly desirable to the Rochow-Müller reaction. Using a simple ball-milling meth... Developing an efficiently supported Cu-based catalyst with promoters to substitute the existing non-supported Cu-based catalysts is highly desirable to the Rochow-Müller reaction. Using a simple ball-milling method and CeO2 support, we prepared a high-performance CuO-ZnO-P-Sn/CeO2 catalyst by integrating highly dispersed multicomponent promoters of ZnO, Sn, and P with the active component CuO. This catalyst shows a significantly enhanced dimethyldichlorosilane selectivity because these promoters can substantially increase the Cu+ content and the formation of an active CuxSi phase. This work provides a new approach to efficiently designing Cu-based catalysts for the Rochow-Müller reaction. 展开更多
关键词 Rochow-Miller reaction CuO/CeO2catalyst Promoters Heterogene0us catalysis Solid-phase synthesis
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Effect of CeO2on Activity of Catalysts CuO/ZnO/Al2O3/CeO2for Synthesis of Methanol 认领 引用
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作者 Zhou Songhua Li Wenbo +7 位作者 Wu Zongjin Chen Zhongyang Huang Chen Zhang Chuanwei Wang Bo Pan Hongyan Lin Qian 无 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第3期104-114,共11页
The size of the nanoparticles and the number of oxygen vacancies have a significant effect on the catalytic activity of copper-based catalysts used for the synthesis of methanol from syngas.In this study,the authors p... The size of the nanoparticles and the number of oxygen vacancies have a significant effect on the catalytic activity of copper-based catalysts used for the synthesis of methanol from syngas.In this study,the authors prepared a series of catalysts CuO/ZnO/Al2O3/CeO2(CZAC)with CuO particles of different sizes and varying number of oxygen vacancies on the surface by changing the added volume of CeO2 by using the co-precipitation method.The properties of the catalysts were characterized and their activity was evaluated by using high-pressure fixed-bed reaction equipment.The results showed that the addition of CeO2to CuO/ZnO/Al2O3not only influenced the size of the CuO particles and metal-metal interactions,but also had an effect on the concentrations of oxygen vacancies and strongly basic sites.The presence of CuO particles of small sizes and a large numbers of oxygen vacancies on the surface of the catalyst were beneficial to its activity for the synthesis of methanol.The catalyst CZAC,when modified by 5%of CeO2,recorded CuO particles of the smallest size(8.9 nm),strong intermetallic interactions,and the highest concentrations of oxygen vacancies and strongly basic sites.It also exhibited the highest catalytic activity,with a space-time yield of methanol of 0.315 g/(h·g)that was higher than that of the enterprise RK-5 catalyst[0.215 g/(h·g)]. 展开更多
关键词 catalyst amount of CeO2added size of CuO particles oxygen vacancies methanol synthesis
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Effects of Carrier on CuO/TiO_2 and CuO/Ti0.5Zr0.5O_2 Catalysts in the NO+CO Reaction 认领 引用 被引量：1
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作者 GuangHuiDING XiaoYuanJIANG XiaoMingZHENG 《Chinese Chemical Letters》 SCIE CAS 2005年第2期275-278,共4页
Using TiO2 and Ti0.5Zr0.5O2 as carriers, the CuO/TiO2 and CuO/Ti0.5Zr0.5O2 catalystswere prepared by the impregnation method with Cu(NO3)2 as active component. The catalyticactivities in NO+CO reaction were investigat... Using TiO2 and Ti0.5Zr0.5O2 as carriers, the CuO/TiO2 and CuO/Ti0.5Zr0.5O2 catalystswere prepared by the impregnation method with Cu(NO3)2 as active component. The catalyticactivities in NO+CO reaction were investigated using a microreactor-GC system, and structure andreducibility of catalysts were characterized by means of physical adsorption, TPR, XRD, NO-TPDtechnologies. It was found that the activity of CuO/Ti0.5Zr0.5O2 catalyst was higher than that ofCuO/TiO2, probably due to the large specific surface area of Ti0.5Zr0.5O2 that played an importantrole in NO+CO reaction. 展开更多
关键词 Ti0.5Zr0.5O2 solid solution supported CuO catalysts NO+CO reaction.
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CuO/Bi2O3光催化耦合过一硫酸盐氧化降解盐酸四环素 认领 引用 被引量：16
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作者 丁丽丹 周家斌 +4 位作者 刘文博 陈新 冯芹芹 杨玉玲 张天磊 《环境工程学报》 CAS CSCD 北大核心 2021年第3期898-910,共13页
利用共沉淀-浸渍法合成了基于可见光响应的CuO/Bi2O3复合催化剂,并对其光催化活化过一硫酸盐(PMS)去抗生素盐酸四环素(TC-HCl)的性能进行了探究。分别运用XRD、XPS、FESEM、UV-Vis DRS等技术对催化剂进行了结构以及形貌的表征。... 利用共沉淀-浸渍法合成了基于可见光响应的CuO/Bi2O3复合催化剂,并对其光催化活化过一硫酸盐(PMS)去抗生素盐酸四环素(TC-HCl)的性能进行了探究。分别运用XRD、XPS、FESEM、UV-Vis DRS等技术对催化剂进行了结构以及形貌的表征。考察了PMS浓度、催化剂投加量及pH对TC-HCl去除的影响。结果表明:CuO的掺杂有利于提高Bi2O3的可见光催化性能,也增强了对PMS的活化;在可见光照射100 min、催化剂的用量为0.2 g·L−1、PMS的投加量为10 mmol·L−1的条件下,CuO/Bi2O3复合催化剂对初始浓度为40 mg·L−1的TCHCl的降解率可达到99.6%;SO4-·和·OH是催化降解TC-HCl的主要活性物种;该复合催化剂具有很好的稳定性。以上研究结果可为探索新型非均相催化剂在抗生素废水处理的应用提供参考。 展开更多
关键词 CuO/Bi2O3复合催化剂 光催化 过一硫酸盐 盐酸四环素
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微波加热分解法制备CuO-Ce0.6Zr0.4O_2及其催化CO氧化性能 认领 引用 被引量：4
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作者 杨志强 毛东森 +2 位作者 吴仁春 俞俊 王倩 《物理化学学报》 SCIE CAS CSCD 北大核心 2011年第5期1163-1168,共6页
采用微波加热分解法制备了一系列CuO含量(0-25%,w)不同的CuO-Ce0.6Zr0.4O2催化剂,并用X射线衍射(XRD)、透射电镜(TEM)、N2吸附-脱附(BET)和H2程序升温还原(H2-TPR)技术对催化剂进行了表征,利用色谱流动法考察了其催化CO低温氧化性能.结... 采用微波加热分解法制备了一系列CuO含量(0-25%,w)不同的CuO-Ce0.6Zr0.4O2催化剂,并用X射线衍射(XRD)、透射电镜(TEM)、N2吸附-脱附(BET)和H2程序升温还原(H2-TPR)技术对催化剂进行了表征,利用色谱流动法考察了其催化CO低温氧化性能.结果表明:当CuO含量为15%时,所制备催化剂的催化活性最佳.在催化剂中存在三种不同类型的铜物种,即高分散、小颗粒和大颗粒的CuO.催化剂表面高分散和小颗粒的CuO有利于催化活性的提高,而大颗粒的CuO对催化活性具有抑制作用. 展开更多
关键词 微波加热 氢氧化四氨合铜 CuO-Ce0.6Zr0.4O2催化剂 CO氧化
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花球状CuO/CeO2材料上HCN的催化消除 认领 引用 被引量：2
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作者 伊志豪 孙杰 +4 位作者 李吉刚 周添 卫寿平 解洪嘉 杨育霖 《材料导报》 EI CAS CSCD 北大核心 2021年第8期17-22,共6页
利用水热法和沉积沉淀法分别合成了微米级花球状CeO2载体和含有不同质量分数CuO纳米颗粒的负载型CuO/CeO2材料。考察CuO/CeO2材料对HCN的防护时间和消除率,并与KZ09-1防毒活性炭样品对HCN的防护性能进行比较,进而评价CuO/CeO_... 利用水热法和沉积沉淀法分别合成了微米级花球状CeO2载体和含有不同质量分数CuO纳米颗粒的负载型CuO/CeO2材料。考察CuO/CeO2材料对HCN的防护时间和消除率,并与KZ09-1防毒活性炭样品对HCN的防护性能进行比较,进而评价CuO/CeO2催化材料对HCN的防护性能。催化材料在25℃、体积空速为120000 h-1、水汽体积分数为5%的反应条件下,对130 mg/m3HCN的防护性能为:10%CuO/CeO2>15%CuO/CeO2>5%CuO/CeO2>KZ091>3%CuO/CeO2>1%CuO/CeO2。考察反应温度对HCN消除率的影响发现,当反应温度为100℃、反应时间为2 h时,催化材料对HCN的消除率可达98%。考察不同反应温度条件下反应产物的选择性,对HCN在催化材料上的反应机理进行推测,当反应温度为25~50℃时,催化材料对HCN的消除以化学吸附为主,伴随有催化水解和催化氧化反应;当反应温度为50~100℃时,HCN在催化材料表面通过化学吸附、催化水解及催化氧化反应消除,其中催化水解和催化氧化占主导作用;当反应温度为100~200℃时,HCN在催化材料表面通过化学吸附、催化水解、催化氧化以及NH3-SCR反应协同消除。 展开更多
关键词 CuO/CeO2 防护时间 化学吸附 催化水解 催化氧化 NH3-SCR
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