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Ni-O-Nd active structure over inverse Nd2O3/Ni catalyst enables efficient CO2 hydrogenation to methane 认领 引用
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作者 Mingxue Wang Junliang Xia +4 位作者 Yu Xie Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期979-990,I0021,共12页
Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temper... Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temperatures.Herein,an inverse Nd2O3/Ni catalyst with Ni‑O‑Nd structures as catalytically active sites was facilely constructed.It achieved>80%CO2conversion with a CH4space‑time yield up to 143.4 mmol gcat-1h-1at 225℃and 1 bar,which far exceeded its counterpart(Nd2O3+Ni,27.8 mmol h-1),representing one of the state‑of‑the‑art CO2methanation catalysts.Systematic characterizations revealed that the well‑dispersed Nd species on Ni substrate over inverse Nd2O3/Ni enhanced Ni‑Nd2O3interaction and promoted the formation of Ni‑O‑Nd interface.Then,its surface basicity and local environment of Ni was greatly optimized,thus enhancing CO2adsorption and oxygenate hydrogenation abilities.In situ spectra and DFT calculations revealed that instead of the sole carbonyl pathway over Nd2O3+Ni,the Ni‑O‑Nd interface over the inverse Nd2O3/Ni brought a supplementary formate pathway with low energy barriers.Besides,it enabled lower energy barriers for CO2dissociation(0.30 vs 0.61 eV)and CO∗hydrogenation(0.70 vs 0.84 eV).Consequently,CO2activation and oxygenate hydrogenation ability over this inverse catalyst could be greatly enhanced,contributing to its excellent activity. 展开更多
关键词 CO2methanation Inverse Nd2O3/Ni catalyst Ni–O–Nd structure HCOO*and CO*pathway Oxygenate hydrogenation
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CaO含量对SiO2-Al2O3-CaO系轻质陶粒性能的影响及机理分析 认领 引用
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作者 张祎欢 范海宏 +2 位作者 李俊杰 王玉浓 吴瑞 《新型建筑材料》 2026年第8期88-93,99,共6页
以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率... 以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率则呈相反规律。当CaO含量为11.56%、烧结温度1180℃时,可获得综合性能最优的陶粒:单颗粒强度1.75 MPa,表观密度471.43 kg/m3,吸水率3.85%。XRD与SEM-EDS分析表明,钙长石是陶粒膨胀过程的主导晶相,其含量随CaO含量的增加而升高。机理研究表明,适量CaO既可降低熔体黏度促进气体包裹,又能与硅铝组分反应形成钙长石骨架,二者协同作用实现陶粒的轻质化。 展开更多
关键词 SiO2-Al2O3-CaO系 陶粒 工业固废 钙长石 CaO含量 烧结机理
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Tri-functional Ru catalyst drives efficient ammonia synthesis from N2 and H2O 认领 引用
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作者 Ying Hou Wei Hu +6 位作者 Qiao Zhao Yuchuan Tu Guang Yang Yi Cui Wei Liu Liang Yu Dehui Deng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期769-775,I0018,共7页
1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inhere... 1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inherent limitations of the traditional Haber-Bosch approach,which remains highly energy-intensive due to the extreme operation conditions(above 350℃ and over 10 MPa)required to activate the robust N≡N bond(945 kJ mol-1).Furthermore,the process is carbon-intensive,as its primary hydrogen source is derived from hydrocarbon reforming with high carbon emissions[1,2]. 展开更多
关键词 NH3 synthesis N and H2O Tri-functional Ru-based catalyst Reversible Li battery
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CeO_2-ZrO_2-La_2O_3-Al_2O_3 composite oxide and its supported palladium catalyst for the treatment of exhaust of natural gas engined vehicles 认领 引用 被引量：5
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作者 Xiaoyu Zhang Enyan,Long +5 位作者 Yile Li Jiaxiu Guo Lijuan Zhang Maochu Gong Minghua Wang Yaoqiang Chen 《Journal of Natural Gas Chemistry》 2009年第2期139-144,共6页
Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and N... Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and NOx in the mixture gas simulated the exhaust from natural gas vehicles （NGVs） operated under stoichiometric condition was investigated. The effect of La2O3 on the physicochemical properties of supports and catalysts was characterized by various techniques. The characterizations with X-ray diffraction （XRD） and Raman spectroscopy revealed that the doping of La2O3 restrained effectively the sintering of crystallite particles, maintained the crystallite particles in nanoscale and stabilized the crystal phase after calcination at 1000 ℃. The results of N2-adsorption, H2-temperatnre-programmed reduction （H2-TPR） and oxygen storage capacity （OSC） measurements indicated that La2O3 improved the textural properties, reducibility and OSC of composite supports. Activity testing results showed that the catalysts exhibit excellent activities for the simultaneous removal of methane, CO and NOx in the simulated exhaust gas. The catalysts supported on CZALa showed remarkable thermal stability and catalytic activity for the three pollutants, especially for NOx. The prepared palladium catalysts have high ability to remove NOx, CH4 and CO, and they can be used as excellent catalysts for the purification of exhaust from NGVs operated under stoichiometric condition. The catalysts reported in this work also have significant potential in industrial application because of their high performance and low cost. 展开更多
关键词 Pd catalysts natural gas vehicles exhaust methane oxidation NOx conversion CeO2-ZrO2-Al2O3 La2O3
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Utilization of steelwork off-gases through methanol synthesis:Sulfur-induced dynamic migration of ZnOx over industrial Cu/ZnO/Al2O3 catalyst and the poisoning mechanism 认领 引用
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作者 Yukun Tian Yu Zeng +5 位作者 Ziyang Chen Hua Tong Ming Chen Zhiyong Zhong Daiqi Ye Limin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期659-673,共15页
The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonizatio... The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonization.However,steelwork off-gases typically contain various impurities,including H2S,which can deactivate commercial methanol synthesis catalysts,Cu/ZnO/Al2O3(CZA).Reverse water-gas shift(RWGS)reaction is the predominant side reaction in CO2 hydrogenation to methanol which can occur at ambient pressure,enabling the decouple of RWGS from methanol production at high pressure.Then,a series of activated CZA catalysts has been in-situ pretreated in 400 ppm H2S/Ar at 250℃and tested for both RWGS reaction at ambient pressure and CO2 hydrogenation to methanol at high pressure.An innovative decoupling strategy was employed to isolate the RWGS reaction from the methanol synthesis process,enabling the investigation of the evolution of active site structures and the poisoning mechanism through elemental analysis,X-ray Diffraction,X-ray Photoelectron Spectroscopy,Fourier Transform Infrared Spectroscopy,Temperature Programmed Reduction and CO2 Temperature Programmed Desorption.The results indicate that there are different dynamic migration behaviors of ZnOx in the two reaction systems,leading to different poisoning mechanisms.These interesting findings are beneficial to develop sulfur resistant and durable highly efficient catalysts for CO2 hydrogenation to methanol,promoting the carbon emission reduction in steel industry. 展开更多
关键词 Steelwork off-gases CO2hydrogenation to methanol H2S Cu/Zn O/Al2O3catalysts ZnOxmigration Deactivation and promotion mechanisms
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Synthesis of neodymium modified CeO_2-ZrO_2-Al_2O_3 support materials and their application in Pd-only three-way catalysts 认领 引用 被引量：8
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作者 彭娜 周菊发 +3 位作者 陈山虎 罗秀超 陈耀强 龚茂初 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第4期342-349,共8页
Ce-Zr-Al-Nd2O3 （CZAN） support materials were prepared by co-precipitation and impregnation methods, respectively. They were characterized by X-ray diffTaction （XRD）, low temperature nitrogen adsorption-desorption,... Ce-Zr-Al-Nd2O3 （CZAN） support materials were prepared by co-precipitation and impregnation methods, respectively. They were characterized by X-ray diffTaction （XRD）, low temperature nitrogen adsorption-desorption, oxygen pulsing technique, H2-temperamre programmed reduction （H2-TPR） and X-ray photoelectron spectroscopy （XPS）. The Pd-only three-way catalysts （Pd-TWC） supported on these materials were prepared by incipient wetness method and studied by activity tests. The results demonstrated that the CZAN supports obtained by the two methods showed better structural, textural and redox properties than the CZA without Nd2O3, and the addition of Nd203 improved the catalytic activity of TWC. Especially, the CZAN-i support prepared by impregnation method had better thermal stability and redox property. Meanwhile, the Pd/CZAN-i catalyst exhibited the best catalytic performance. XPS measurements indicated that the Nd-modified samples possessed more Ce3＋ and oxygen vacancies on the surface of samples, which led to a better redox property. The excellent redox property of support materials helped to improve the catalytic activity of TWC. 展开更多
关键词 CeO2-ZrO2-Al2O3 support materials Nd2O3 Ce-O-Nd bonds Pd-only three-way catalysts redox property rare earths
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Sulfur poisoning and regeneration of MnO_x-CeO_2-Al_2O_3 catalyst for soot oxidation 认领 引用 被引量：12
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作者 吴晓东 李亨烈 +1 位作者 刘爽 翁端 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第7期659-664,共6页
MnOx-CeO2-Al2O3 mixed oxides were prepared by impregnating manganese and cerium precursors on alumina powders via a sol- gel deposition method. The oxide catalyst exhibited a poor resistance to sulfur dioxide after th... MnOx-CeO2-Al2O3 mixed oxides were prepared by impregnating manganese and cerium precursors on alumina powders via a sol- gel deposition method. The oxide catalyst exhibited a poor resistance to sulfur dioxide after the treatment in 100 ppm SO2/air at 350 °C for 50 h. The formation of manganese sulfate and especially cerium sulfate reduced the availability of surface active metal oxides, blocked the pore structure and decreased the surface area of the catalyst. These changes in chemical and structural and textural properties resulted in a severe loss in the activities of the sulfated catalyst for NO and soot oxidation. The decomposition of sulfates was almost complete during the calcina-tion in air at 800 °C for 30 min, which partially recovered the surface active sites and the catalyst surface area despite the significant sintering of metal oxides. Consequently, the NOx-assisted soot oxidation activity of the catalyst was regenerated to some extent by the oxidation treatment. 展开更多
关键词 MnOx-CeO2-Al2O3 mixed oxides diesel soot sulfur dioxide thermal regeneration rare earths
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Performance of Pd/CeO_2-ZrO_2-Al_2O_3 catalyst for motorcycle 认领 引用 被引量：5
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作者 赵明 陈山虎 +2 位作者 张晓玉 龚茂初 陈耀强 《Journal of Rare Earths》 SCIE EI CAS 2009年第5期728-732,共5页
The Pd-only catalysts for motorcycle were prepared by impregnating CeO2-ZrO2-Al2O3 and CeO2-ZrO2+Al2O3 with PdCl2 aqueous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H2-tem... The Pd-only catalysts for motorcycle were prepared by impregnating CeO2-ZrO2-Al2O3 and CeO2-ZrO2+Al2O3 with PdCl2 aqueous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H2-temperature-programmed reduction (H2-TPR) methods. The XRD result indicated that the CeO2-ZrO2-Al2O3 compound prepared by co-precipitation formed a single solid solution and had good thermal stability, and Pd phase was not observed in all catalysts. The TPR results showed that the reduction temperature of Pd/CeO2-ZrO2-Al2O3 catalyst was lower than that of Pd/CeO2-ZrO2+Al2O3 catalyst whether they were fresh or aged catalysts. The Pd/CeO2-ZrO2-Al2O3 exhibited high three-way catalytic activity at low temperature, high thermal stability, and wide working window, suggesting a great potential for applications. 展开更多
关键词 CeO2-ZrO2-Al2O3 palladium TWC H2-TPR motorcycle rare earths
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CeO_2-La_2O_3/γ-Al_2O_3稀土氧化物混合物催化还原SO_2的实验研究 认领 引用 被引量：6
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作者 胡辉 李劲 +1 位作者 张顺喜 李胜利 《环境科学》 EI CAS 北大核心 2004年第2期17-21,共5页
在La2 O3 中加入变价稀土氧化物CeO2 ,组成一种稀土氧化物的混合物 ,以这种混合物作为CO还原SO2 的催化剂 .采用连续流动固定床反应器 ,在反应气体SO2 和CO按SO2 ∶CO =1∶3,载流气体为N2 ,气体流量为 10 0 0mL/min的条件下 ,实验研究... 在La2 O3 中加入变价稀土氧化物CeO2 ,组成一种稀土氧化物的混合物 ,以这种混合物作为CO还原SO2 的催化剂 .采用连续流动固定床反应器 ,在反应气体SO2 和CO按SO2 ∶CO =1∶3,载流气体为N2 ,气体流量为 10 0 0mL/min的条件下 ,实验研究了该催化剂的活化过程以及温度和反应物浓度配比对活化反应的影响 ,用XRD和XPS对反应前后催化剂进行了表征 ,分析了相结构的变化 .结果表明 :CeO2 和La2 O3 2种稀土氧化物的混合物 ,在CO还原SO2 的催化反应中 ,活化温度比单个的CeO2 或La2 O3 氧化物下降了 5 0℃～ 10 0℃ ,而且具有更高的活性 .这可能是CeO2 和La2 O3 氧化物之间存在着某种协同作用所致 . 展开更多
关键词 CeO2-La2O3/γ-Al2O3 混合物 催化还原 脱硫
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Selective catalytic reduction of NO with NH_3 over sol-gel-derived CuO-CeO_2-MnO_x/γ-Al_2O_3 catalysts 认领 引用 被引量：3
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作者 赵清森 向军 +3 位作者 孙路石 石金明 苏胜 胡松 《Journal of Central South University》 SCIE EI CAS 2009年第3期513-519,共7页
Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. ... Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO2-MnOx/γ-Al2O3 catalysts is 300-400 ℃ . The catalysts maintain nearly 100% NO conversion at 350 ℃. The NH3 oxidation experiments show that both NO and N2O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH3, which improves the denitrification activity at low temperature. The over-oxidation of NH3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH3 and NO desorption experiments show that NH3 and NO can be adsorbed on CuO-CeO2-MnOx/γ-Al2O3 granular catalysts. The transient response of NH3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process. 展开更多
关键词 sol-gel method CuO-CeO2-MnOx/γ-Al2O3 NH3 NO conversion selective catalytic reduction （SCR）
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Characterization of CuO Species and Thermal Solid-Solid Interaction in CuO/CeO2-Al_2O3Catalyst by In-Situ XRD,Raman Spectroscopy and TPR 认领 引用 被引量：10
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作者 He Mai Luo Mengfei Fang Ping 《Journal of Rare Earths》 SCIE EI CAS 2006年第2期188-192,共5页
Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst... Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst calcined at 300℃,two kinds of CuO species coexist on the surface,that is,highly dispersed and bulk CuO crystalline phase.Four kinds of CuO species are present for the catalyst calcined at 600℃,:(1)highly dispersed CuO,(2)bulk CuO on the surface,(3)bulk CuO in the internal layer of CeO2,and(4)CuAl2O4 formed from CuO-Al2O3 interaction.For the catalyst calcined at 800℃,C,besides very little highly dispersed and bulk CuO on the surface,most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased.At 900℃,,all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4.The results show that the distribution of CuO species in the catalysts depends on the calcination temperature;the different CuO species can be effectively confirmed by in-situ XRD,Raman spectroscopy and H2-TPR techniques. 展开更多
关键词 CuO/CeO2-Al2O3 TPR solid-solid interaction rare earths
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Pd/γ-Al_2O_3三效催化剂中CeO_2-ZrO_2-La_2O_3的作用 认领 引用 被引量：2
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作者 蒋平平 张志刚 +4 位作者 郭耘 张顺海 郭杨龙 王幸宜 卢冠忠 《中国稀土学报》 CAS 北大核心 2004年第4期538-542,共5页
用浸渍法制备了CeO2-ZrO2-La2O3复合氧化物,用XRD,TG-DTA,拉曼光谱、H2-TPR和BET表面积测定等方法对合成的样品进行了表征,研究了在单钯Pd/γ-Al2O3催化剂中添加CeO2-ZrO2-La2O3对催化剂活性和热稳定性的影响。结果表明,在Pd/γ-Al2O3... 用浸渍法制备了CeO2-ZrO2-La2O3复合氧化物,用XRD,TG-DTA,拉曼光谱、H2-TPR和BET表面积测定等方法对合成的样品进行了表征,研究了在单钯Pd/γ-Al2O3催化剂中添加CeO2-ZrO2-La2O3对催化剂活性和热稳定性的影响。结果表明,在Pd/γ-Al2O3中加入三元复合氧化物有利于提高三效催化剂的热稳定性,有利于阻止γ-Al2O3在高温时的相变以稳定Al2O3结构,防止在高温条件下催化剂表面积的损失。在Pd的负载量为1 g·L-1条件下,测定了Pd/CeO2-ZrO2-La2O3/γ-Al2O3/蜂窝陶瓷催化剂对CO,C3H6和NO净化的三效活性,研究了催化剂的结构和三效催化活性之间的关系。结果表明,CeO2-ZrO2-La2O3的存在能明显提高Pd基催化剂对CO,C3H6和NO的三效净化活性,扩大催化剂的操作窗口,提高在富氧条件下对NOx的还原性能。 展开更多
关键词 催化化学 CeO2-ZrO2-La2O3 单钯三效催化剂 汽车尾气净化 稀土
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Autothermal reforming of methane over Ni catalysts supported over ZrO2-CeO2-Al2O3 认领 引用 被引量：6
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作者 Xiulan Cai Yuanxing Cai Weiming Lin 《Journal of Natural Gas Chemistry》 2008年第2期201-207,共7页
Ni catalysts supported on Al2O3, ZrO2-Al2O3, CeO2-Al2O3 and ZrO2-CeO2-Al2O3 were prepared by coprecipitation method, and their catalytic performances for autothermal reforming of methane to hydrogen were investigated.... Ni catalysts supported on Al2O3, ZrO2-Al2O3, CeO2-Al2O3 and ZrO2-CeO2-Al2O3 were prepared by coprecipitation method, and their catalytic performances for autothermal reforming of methane to hydrogen were investigated. The Ni-supported catalysts were characterized by XRD, TPR and XPS. The relationship between the structures and catalytic activities of the catalysts was discussed. The results showed that the catalytic activity and stability of the Ni/ZrO2-CeO2-Al2O3 catalyst was better than those of other catalysts with the highest CH4 conversion, H2/CO and H2/COx ratio at 750 ℃. The catalyst showed a little deactivation along the reaction time during its 72 h on stream with the mean deactivation rate of 0.08%/h. The catalytic performance of the Ni/ZrO2-CeO2-Al2O3 catalyst was also affected by reaction temperature, no2 ： nCH4 molar ratio and nH2O ： nCH4 molar ratio. TPR, XRD and XPS measurements indicated that the formation of ZrO2-CeO2 solid solution could improve the dispersion of NiO, and inhibit the formation of NiAl2O3, and thus significantly promoted the catalytic activity of the Ni/ZrO2-CeO2-Al2O3 catalyst. 展开更多
关键词 methane autothermal reforming hydrogen Ni/ZrO2-CeO2-Al2O3
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Preparation and characterization of Fe_2O_3-CeO_2-TiO_2/γ-Al_2O_3 catalyst for degradation dye wastewater 认领 引用 被引量：6
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作者 LIU Yan SUN De-zhi CHENG Lin LI Yan-ping 《Journal of Environmental Sciences》 SCIE EI CAS 2006年第6期1189-1192,共4页
In order to develop a catalyst with high activity for catalytic wet oxidation （CWO） process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation me... In order to develop a catalyst with high activity for catalytic wet oxidation （CWO） process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% （the weight ratio of Ti to carriers）, and the middle product, Fe2O3-CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h, respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30. 展开更多
关键词 catalytic wet oxidation （CWO） Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst dye wastewater treatment
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微纳米添加剂α-Al2O3在表面涂层领域的应用现状及市场前景 认领 引用
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作者 伏建康 杨茂盏 +2 位作者 冉长荣 郭太雄 张千峰 《材料科学》 2025年第3期468-475,共8页
微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层... 微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层性能的潜力。微纳米α-Al2O3颗粒具有较大的比表面积和表面活性,能够增强涂层的机械性能,如硬度和耐磨性,同时提高涂层的耐腐蚀性和耐高温性能。微纳米α-Al2O3也是一种极优良的改性材料,其与有机硅烷、树脂等材料复合改性,既能大幅提升转化膜的应用效果,对其稳定性和耐候性也有较大的促进作用。在金属表面涂层、陶瓷涂层以及复合材料涂层中,微纳米α-Al2O3添加剂被广泛用于提高涂层的使用寿命和稳定性。此外,它在电子器件、航天航空和汽车工业等高技术领域也展现了广阔的应用前景。未来,随着表面技术的发展,微纳米α-Al2O3无铬钝化领域的市场应用将大幅增长,与其他功能性材料的协同作用和复合材料开发也将成为研究的重点。Micro-nano α-Al2O3 is an important functional material, because of its excellent hardness, wear resistance, corrosion resistance and high thermal stability, has been widely used in the field of surface coating. With the development of micro-nano technology, the application of micro-nano α-Al2O3 as an additive in various coating systems has been deeply studied, showing its potential to significantly improve coating properties. Micro-nano α-Al2O3 particles have a large specific surface area and surface activity, which can enhance the mechanical properties of the coating, such as hardness and wear resistance, while improving the corrosion resistance and high temperature resistance of the coating. Micro-nano α-Al2O3 is also an excellent modified material, and its composite modification with organosilane, resin and other materials can greatly improve the application effect of conversion film, and also has a greater role in promoting its stability and weather resistance. In metal surface coatings, ceramic coatings and composite coatings, micro-nano α-Al2O3 additives are widely used to improve the service life and stability of coatings. In addition, it also shows broad application prospects in high-tech fields such as electronic devices, aerospace and automotive industries. In the future, with the development of surface technology, the market application of micro-nano α-Al2O3 chromium-free passivation will grow significantly, and the synergy with other functional materials and the development of composite materials will also become the focus of research. 展开更多
关键词 纳米α-Al2O3 无铬钝化涂层 陶瓷膜 表面硬度 耐蚀性
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Fe基分子筛催化剂应用于NH3选择性催化还原和N2O直接催化分解反应的研究进展 认领 引用 被引量：1
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作者 明淑君 李新楠 +4 位作者 庞磊 苏长罗 程春晖 杨小东 李涛 《低碳化学与化工》 CAS 北大核心 2025年第6期97-112,共16页
柴油车排放的氮氧化物(NOx)和氧化亚氮(N2O)对人类健康和生态环境造成了显著危害。NH3选择性催化还原(NH3-SCR)技术是当前控制柴油车尾气中NOx排放的有效方法之一,而N2O的直接催化分解(简称“N2O分解”)则被认为... 柴油车排放的氮氧化物(NOx)和氧化亚氮(N2O)对人类健康和生态环境造成了显著危害。NH3选择性催化还原(NH3-SCR)技术是当前控制柴油车尾气中NOx排放的有效方法之一,而N2O的直接催化分解(简称“N2O分解”)则被认为是减少N2O排放的最具潜力的技术。这两种技术的核心均依赖于催化剂的开发与应用。Fe基分子筛催化剂在NH3-SCR和N2O分解反应中展现出了卓越的催化性能,为实现NOx和N2O的同步高效去除提供了一条有前途的路径。综述了Fe基分子筛催化剂在NH3-SCR和N2O分解反应中的催化机理,探讨了Fe基分子筛催化剂的制备方法、拓扑结构、助剂金属掺杂,以及反应环境中共存气体对其理化性质、NH3-SCR活性和N2O分解性能的影响。具体而言,Fe基分子筛催化剂的Fe物种形成与分布受到制备方法和分子筛拓扑结构的显著影响。助剂金属的引入不仅能够增大催化剂的酸性位点含量,还能改善Fe物种的分散性,从而优化其催化性能。此外,共存气体(如NO、O2和H2O)对Fe基分子筛催化剂的N2O分解活性产生不同程度的影响。最后,对Fe基分子筛催化剂的未来研究方向进行了展望,并对催化剂设计优化与性能提升提出了建议。 展开更多
关键词 Fe基分子筛催化剂 NH3-SCR N2O直接催化分解 催化机理
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柴油机后处理ccSCR路线N2O排放特性研究 认领 引用
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作者 殷雪梅 李顺红 +3 位作者 吕志华 马江丽 常仕英 于飞 《内燃机学报》 EI CAS CSCD 北大核心 2026年第1期58-67,共10页
为研究柴油机后处理紧耦合选择性催化还原(ccSCR)路线的一氧化二氮(N2O)排放特性,研究了柴油机在世界统一瞬态循环(WHTC)、世界统一稳态循环(WHSC)和低负荷循环(LLC)下不同催化剂、不同尿素喷射量和电加热(EHC)对N2O排放的影响.... 为研究柴油机后处理紧耦合选择性催化还原(ccSCR)路线的一氧化二氮(N2O)排放特性,研究了柴油机在世界统一瞬态循环(WHTC)、世界统一稳态循环(WHSC)和低负荷循环(LLC)下不同催化剂、不同尿素喷射量和电加热(EHC)对N2O排放的影响.结果表明:氨泄漏催化剂(ASC)对N2O生成的分担率最大,高达50%;增加尿素喷射量利于降低ASC后NOx排放,但增加ASC后NH3和N2O排放风险.WHTC、WHSC和LLC循环下开启EHC,尿素喷射量增加,ASC后NOx排放下降、NH3和N2O排放增加;随EHC加热时间增加,ccSCR和SCR入口平均温度均提升,NOx、NH3和N2O排放降低;WHTC、WHSC和LLC循环下开启EHC,尿素喷射量增加是导致ASC后N2O排放增加的主要原因.针对带EHC的ccSCR国Ⅶ后处理路线,建议优化尿素喷射策略并搭配低N2O型ASC催化剂后处理系统,以实现降低NOx同时降低N2O排放. 展开更多
关键词 柴油机 紧耦合选择性催化还原催化剂 尿素喷射量 氨泄漏催化剂 氨气排放 一氧化二氮排放
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Preparation and desulfurization activity of nano-CeO_2/γ-Al_2O_3 catalysts 认领 引用 被引量：4
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作者 Qi Yang Hui Hu Shan-Shan Wang 《Rare Metals》 SCIE EI CAS CSCD 2018年第7期554-560,共7页
γ-A12O3-supported CeO2 catalysts were pre- pared by microemulsion and impregnation methods and characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM） techniques. At the same time, the des... γ-A12O3-supported CeO2 catalysts were pre- pared by microemulsion and impregnation methods and characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM） techniques. At the same time, the desulfurization activity of catalysts was investigated. The results show that nanoscale active substances and a high desulfurization effect are achieved by microemulsion, exhibiting a significant dominance compared with traditional impregnation method. The optimal preparation condition is temperature of 30 ℃ and ratio of [H20]/[surface active agent] of 7 with slow demulsification. The activated catalysts still keep high and stable desulfurization activity during a wide temperature range of 450-600 ℃. Among a series of prepared catalysts, the desulfurization rate of 6CeOz/γ-A1203 is the highest, reaching up to 80 % when temperature is higher than 550℃. The catalytic reduction mechanism of SO2 over nano-CeOz/γ-A1203 follows redox mechanism. 展开更多
关键词 Nano-CeO2/γ-Al2O3 Microemulsion Catalyst Desulfurization
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Highly selective catalytic reduction of NO_x by MnO_x–CeO_2–Al_2O_3 catalysts prepared by self-propagating high-temperature synthesis 认领 引用 被引量：14
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作者 Chao Wang Feng Yu +5 位作者 Mingyuan Zhu Changjin Tang Ke Zhang Dan Zhao Lin Dong Bin Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第1期124-135,共12页
We first present preparation of MnOx–CeO_2–Al_2O_3 catalysts with varying Mn contents through a self-propagating high-temperature synthesis(SHS) method, and studied the application of these catalysts to the selectiv... We first present preparation of MnOx–CeO_2–Al_2O_3 catalysts with varying Mn contents through a self-propagating high-temperature synthesis(SHS) method, and studied the application of these catalysts to the selective catalytic reduction of NOxwith NH3(NH_3-SCR).Using the catalyst with 18 wt.% Mn(18 MnCe1Al2), 100% NO conversion was achieved at 200°C and a gas hourly space velocity of 15384 hr-1, and the high-efficiency SCR temperature window, where NO conversion is greater than 90%, was widened to a temperature range of 150–300°C. 18 MnCe1Al2 showed great resistance to SO_2(100 ppm)and H_2O(5%) at 200°C. The catalysts were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller(BET) analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and H_2 temperature programmed reduction. The characterization results showed that the surface atomic concentration of Mn increased with increasing Mn content, which led to synergism between Mn and Ce and improved the activity in the SCR reaction. 18 MnCe1Al2 has an extensive pore structure,with a BET surface area of approximately 135.4 m^2/g, a pore volume of approximately 0.16 cm^3/g, and an average pore diameter of approximately 4.6 nm. The SCR reaction on 18 MnCe1Al2 mainly followed the Eley-Rideal mechanism. The performances of the MnOx–CeO_2–Al_2O_3 catalysts were good, and because of the simplicity of the preparation process,the SHS method is applicable to their industrial-scale manufacture. 展开更多
关键词 NH3-SCR SHS method MnOx-CeO2-Al2O3 catalyst NOx removal efficiency
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CuO/CeO_2-Al_2O_3催化剂中CuO物种的原位XRD、Raman和TPR表征 认领 引用 被引量：16
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作者 何迈 方萍 +3 位作者 谢冠群 谢云龙 闫宗兰 罗孟飞 《物理化学学报》 SCIE CAS 北大核心 2005年第9期997-1000,共4页
采用原位XRD、激光Raman光谱和TPR(程序升温还原)技术研究了CuO(w,%)/CeO2-Al2O3催化剂中CuO物种的存在形式及其CuO物种的迁移.低温焙烧(300℃)催化剂,CuO以高分散和晶相两种形式存在于CeO2-Al2O3载体表层.随着焙烧温度的升高,CuO开始... 采用原位XRD、激光Raman光谱和TPR(程序升温还原)技术研究了CuO(w,%)/CeO2-Al2O3催化剂中CuO物种的存在形式及其CuO物种的迁移.低温焙烧(300℃)催化剂,CuO以高分散和晶相两种形式存在于CeO2-Al2O3载体表层.随着焙烧温度的升高,CuO开始从表层向CeO2内层迁移.处于内层的CuO部分以晶相形式存在,部分与Al2O3载体反应生成CuAl2O4.高温有利于表层CuO向CeO2内层迁移,同时促进CuAl2O4生成.结果表明结合原位XRD、激光Raman光谱和TPR技术可以有效地观察催化剂中CuO物种的存在形式和分布. 展开更多
关键词 CuO/CeO2-Al2O3 XRD Raman TPR CuO迁移 固相反应
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