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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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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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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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不同氨(铵)对CuO-La2O3/SiO2催化剂结构与性能的影响 认领 引用 被引量：1
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作者 刘慧敏 王美慧 +1 位作者 于戈文 丁健 《煤炭转化》 CAS CSCD 北大核心 2021年第1期81-88,共8页
以等体积浸渍法制备CuO-La2O3/SiO2催化剂,用于草酸二甲酯(DMO)加氢制乙二醇(EG)反应中,研究了不同氨(铵)源引起的溶液pH值变化对所制备催化剂结构和活性的影响,采用TEM,XRD和化学吸附等手段,表征了催化剂的结构,使用固定床反应器评价... 以等体积浸渍法制备CuO-La2O3/SiO2催化剂,用于草酸二甲酯(DMO)加氢制乙二醇(EG)反应中,研究了不同氨(铵)源引起的溶液pH值变化对所制备催化剂结构和活性的影响,采用TEM,XRD和化学吸附等手段,表征了催化剂的结构,使用固定床反应器评价了催化剂的加氢活性。结果表明:氨源的添加除络合金属离子外,还可以调节溶液的酸碱性,从而改变Cu活性组分在催化剂中的分散度及抗烧结能力,影响催化剂的活性和稳定性;以氨水所制催化剂的加氢性能最优,DMO转化率和EG选择性分别可达98%(质量分数,下同)和97%,并且连续反应200 h后仍保持稳定;以四甲基氢氧化铵制备的催化剂虽然具有较高的Cu分散度和较小的粒径,但由于过高的pH值,使得载体发生晶型转变,导致Cu物种的还原度减小且在原位还原等热条件下迅速烧结,同时活性急剧降低。 展开更多
关键词 CuO-La2O3/SiO2催化剂 草酸酯加氢 等体积浸渍 氨(铵)源 络合
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Catalytic Oxidation of Dimethyl Ether to Dimethoxymethane over Cs Modified H_3PW12O40/SiO_2 Catalysts 认领 引用 被引量：9
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作者 Qingde Zhang Yisheng Tan +3 位作者 Caihong Yang Yizhuo Han Jun Shamoto Noritatsu Tsubaki 《Journal of Natural Gas Chemistry》 2007年第3期322-325,共4页
The attractive utilization route for one-step catalytic oxidation of dimethyl ether to dimethoxymethane was successfully carried out over the H3PW12O40（40%）/SiO2 catalyst, modified by Cs, K, Ni, and V. The Cs modifi... The attractive utilization route for one-step catalytic oxidation of dimethyl ether to dimethoxymethane was successfully carried out over the H3PW12O40（40%）/SiO2 catalyst, modified by Cs, K, Ni, and V. The Cs modification of H3PW12O40（40%）/SiO2 gave the most promising result of 20% dimethyl ether conversion and 34.8% dimethoxymethane selectivity. Dimethoxymethane could be synthe- sized via methoxy groups decomposed from dimethyl ether through the synergistic effect between the acid sites and the redox sites of Cs modified H3PW12O40（40%）/SiO2. 展开更多
关键词 dimethyl ether dimethoxymethane catalytic oxidation Cs modified H3PW12O40/SiO2 XRD
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Conversion and reaction kinetics of coke oven gas over a commercial Fe-Mo/Al_2O_3 catalyst 认领 引用 被引量：2
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作者 屈一新 徐贺明 +2 位作者 赵见峰 王志彦 王亚涛 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第2期293-302,共10页
Producing methanol from coke oven gas(COG) is one of the important applications of COG. Removal of sulfur from COG is a key step of this process. Conversion and reaction kinetics over a commercial Fe-Mo/Al2O3 catalyst... Producing methanol from coke oven gas(COG) is one of the important applications of COG. Removal of sulfur from COG is a key step of this process. Conversion and reaction kinetics over a commercial Fe-Mo/Al2O3 catalyst(T-202) were studied in a continuous flow fixed bed reactor under pressures of 1.6-2.8 MPa, space time of 1.32-3.55 s and temperatures of 240-360 °C. Though the COG contains about 0.6 mol/mol H2, hydrogenation of CO and CO2 is not significant on this catalyst. The conversions of unsaturated hydrocarbons depend on their molecular structures. Diolefins and alkynes can be completely hydrogenated even at relatively low temperature and pressure. Olefins, in contrast, can only be progressively hydrogenated with increasing temperature and pressure. The hydrodesulfurization(HDS) of CS2 on this catalyst is easy. Complete conversion of CS2 was observed in the whole range of the conditions used in this work. The original COS in the COG can also be easily converted to a low level. However, its complete HDS is difficult due to the relatively high concentration of CO in the COG and due to the limitation of thermodynamics. H2 S can react with unsaturated hydrocarbons to form ethyl mercaptan and thiophene, which are then progressively hydrodesulfurized with increasing temperature and pressure. Based on the experimental observations, reaction kinetic models for the conversion of ethylene and sulfur-containing compounds were proposed; the values of the parameters in the models were obtained by regression of the experimental data. 展开更多
关键词 coke oven gas conversion Fe-Mo/Al2O3 catalyst sulfur-containing compound kinetics
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Weakening internal diffusion effect in selective hydrodesulfurization of FCC gasoline by novel designed eggshell CoMoS/Al_2O_3 catalysts 认领 引用 被引量：2
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作者 Bin Liu Yongming Chai +2 位作者 Yajing Wang Yunqi Liu Chenguang Liu 《Journal of Natural Gas Chemistry》 CSCD 2012年第2期194-199,共6页
A simple method for preparation of presulfided eggshell CoMoS/γ-Al2O3 catalysts with sharp boundary is developed, through which the eggshell thicknesses of Co and Mo could be easily regulated by controlling the impre... A simple method for preparation of presulfided eggshell CoMoS/γ-Al2O3 catalysts with sharp boundary is developed, through which the eggshell thicknesses of Co and Mo could be easily regulated by controlling the impregnation time. According to the results characterized by EDS, XRD, HRTEM and FT-IR of adsorbed CO, the active component structures, the nature and/or the amount of active sites on the eggshell catalyst are similar to these on the uniform catalyst. The evaluation results of the catalytic performance in selective hydrodesulfurization （HDS） of FCC gasoline show the presence of significant internal diffusion inhibition effect on HDS of S-compounds especially in the uniform catalyst. Compared with uniform catalyst, the eggshell catalyst could remarkably reduce such an internal diffusion inhibition effect due to a shortened diffusion path of the reactants, thus showing higher HDS activity and selectivity. 展开更多
关键词 CoMoS/γ-Al2O3 eggshell catalyst uniform catalyst internal diffusion hydrodesulfurization
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Catalytic decomposition of CH_4 over Ni-Al_2O_3-SiO_2 catalysts:Influence of pretreatment conditions for the production of H_2 认领 引用 被引量：2
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作者 Jangam Ashok Gangadhara Raju +2 位作者 Padigapati Shiva Reddy Machiraju Subrahmanyam Akula Venugopal 《Journal of Natural Gas Chemistry》 2008年第2期113-119,共7页
This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, a... This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si （4 ： 0.5 ： 1.5） catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2. 展开更多
关键词 in situ reduction Ni-Al2O3-SiO2 catalyst methane decomposition hydrogen production carbon nanofibers
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Selective Hydrogenation of Butyne-1,4-diol to Butane-1,4-diol over Ni/Al_2O_3-SiO_2 Catalysts 认领 引用 被引量：2
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作者 Fang Jie Zhuang Changjian +2 位作者 Meng Jipeng Cheng Lang Lu Jiangyin 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期20-28,共9页
Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by... Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by a series of characterization techniques including BET, XRD, SEM, EDX-mapping, TEM, H_2-TPR, XPS, NH_3-TPD and Py-FTIR. Compared to Ni/Al_2O_3 catalyst, the SiO_2-doped samples exhibited better B_3D conversion. SiO_2 could help to form a strong interaction between NiO with the support, which inhibited Ni agglomeration at high temperature, improved the Ni dispersion, and enhanced the hydrogenation activity. B_1D selectivity was mainly influenced by the quantity of Lewis acid sites in addition to the Ni dispersion. The catalyst with a silica loading of 6.4% demonstrated an excellent selectivity of 75.18%(by 13% higher than the contrastive Ni/Al_2O_3 catalyst), which was attributed to the larger amount of Lewis acid sites and the moderate interaction between NiO with the support, which could facilitate the nickel dispersion on a preferable surface area of 176.3 m^2/g of support. 展开更多
关键词 Ni/Al2O3-SiO2 catalysts butyne-1,4-diol butane-1,4-diol hydrogenation
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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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The nature of the deactivation of hydrothermally stable Ni/SiO2–Al2O3 catalyst in long-time aqueous phase hydrogenation of crude 1,4-butanediol 认领 引用 被引量：4
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作者 Haitao Li Yin Zhang +5 位作者 Hongxi Zhang Xiaoqin Qin Yalin Xu RuifangWu Zheng Jiang Yongxiang Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期2960-2967,共8页
The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent... The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent catalysts used at different time,indicated that the main reason of the catalyst deactivation was the deposition of carbonaceous species that covered the active Ni and blocked mesopores of the catalyst.The TPO and SEM measurements revealed that the carbonaceous species included both oligomeric and polymeric species with high C/H ratio and showed sheet.Such carbonaceous species might be eliminated through either direct H2 reduction or the combined oxidation-reduction methodologies. 展开更多
关键词 1,4-Butanediol Hydrogenation Ni/SiO2–Al2O3 catalyst Deactivation Regeneration
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Application of Li_2SiO_3 as a heterogeneous catalyst in the production of biodiesel from soybean oil 认领 引用 被引量：6
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作者 Jian Xun Wang Kung Tung Chen +1 位作者 Shiuh Tsuen Huang Chiing Chang Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第11期1363-1366,共4页
Biodiesel was synthesized from soybean oil by transesterification over Li_2SiO_3 catalyst.The Li_2SiO_3 can be used for biodiesel production directly without further drying or thermal pretreatment,no obvious differenc... Biodiesel was synthesized from soybean oil by transesterification over Li_2SiO_3 catalyst.The Li_2SiO_3 can be used for biodiesel production directly without further drying or thermal pretreatment,no obvious difference in the FAME conversion（92.4-96.7%） between the air-exposed catalyst（24-72 h） and the fresh one（94.2%）.This leads to important benefits when considering industrial applications of Li_2SiO_3 as a solid catalyst for storing and handling catalyst without taking special actions. 展开更多
关键词 Biodiesel Solid catalyst Li2SiO3 Transesterification Triglyceride
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Influence of catalyst support structure on ethene/decene metathesis and coke formation over WO_3/SiO_2 catalyst 认领 引用 被引量：1
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作者 Zheng Min Chen Sheng-Li +4 位作者 Zhang Jun-Hui Liu Yan Sang Lei You Ju Wang Xiao-Dong 《Petroleum Science》 SCIE CAS CSCD 2013年第1期112-119,共8页
8wt%WO3/SiO2 metathesis （disproportionation） catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-deso... 8wt%WO3/SiO2 metathesis （disproportionation） catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-desorption, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, UV-visible diffuse reflectance spectroscopy （DRS） and scanning transmission electron microscopy-high-angle annular dark field （STEM HAADF）. The results of STEM HAADF showed that WO3 species were not uniformly distributed on the SiO2 support. The experimental results of 8wt%WO3/SiO2 performance in ethene/decene metathesis revealed that the catalytic effect of 8wt%WO3/SiO2 catalyst and coke formation over it were closely related to the support pore structure： The 8wt%WO3/SiO2 catalyst with a more complicated pore structure showed better catalytic performance but the coke deposition rate was also faster. 展开更多
关键词 Metathesis WO3/SiO2 catalysts pore structure coke formation
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磁性纳米TiO_2/SiO_2/Fe_3O_4光催化剂的制备及表征 认领 引用 被引量：43
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作者 廖振华 陈建军 +2 位作者 姚可夫 赵方辉 李荣先 《无机材料学报》 SCIE EI CAS 北大核心 2004年第4期749-754,共6页
以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样... 以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样品为双层包覆型结构,SiO2为中间层,最外层是锐钛矿型的TiO2。该复合光催化剂对甲基橙溶液有较高的光催化活性,并具有可利用其磁性回收重用的特点,应用前景广泛。 展开更多
关键词 TiO2/SiO2/Fe3O4 包覆 磁性 光催化
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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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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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以钢渣为原料的SiO_2-CaO-Al_2O_3系陶瓷烧结机理 认领 引用 被引量：16
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作者 艾仙斌 李宇 +2 位作者 郭大龙 赵立华 苍大强 《中南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2015年第5期1583-1587,共5页
以主要化学成分为Ca O和Si O2的钢渣为原料,制备Si O2-Ca O-Al2O3系钢渣陶瓷,采用差分扫描量热仪(DSC)、X线衍射仪(XRD)、扫描电子显微镜(SEM)与热力学计算研究钢渣陶瓷烧结过程及反应机理。研究结果表明:在以钢渣-黏土-长石-石英为主... 以主要化学成分为Ca O和Si O2的钢渣为原料,制备Si O2-Ca O-Al2O3系钢渣陶瓷,采用差分扫描量热仪(DSC)、X线衍射仪(XRD)、扫描电子显微镜(SEM)与热力学计算研究钢渣陶瓷烧结过程及反应机理。研究结果表明:在以钢渣-黏土-长石-石英为主要原料的Si O2-Ca O-Al2O3体系中,钢渣陶瓷晶相以钙长石相为主;钢渣陶瓷烧结初期以扩散传质反应为主,之后形成高温液相,促进反应进行和晶体长大,并完成坯体致密化;经过湿磨的钢渣中存在大量的氢氧化钙等矿相,这些矿相在钢渣陶瓷烧结过程中能够分解产生具有很强反应活性的氧化钙,因而促进了原料间的反应和陶瓷致密化过程。 展开更多
关键词 钢渣 陶瓷 烧结机理 SiO2-CaO-Al2O3系
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Performance of V_2O_5-WO_3-MoO_3/TiO_2 Catalyst for Selective Catalytic Reduction of NO_x by NH_3 认领 引用 被引量：17
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作者 高岩 栾涛 +2 位作者 吕涛 程凯 徐宏明 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第1期1-7,共7页
The V/O5-WO3-MoOy＇TiO2 honeycomb catalyst was prepared with industrial grade chemicals. The structural and physico-chemical properties were analyzed with X-ray diffraction （XRD）, scanning electron micrograph （SEM... The V/O5-WO3-MoOy＇TiO2 honeycomb catalyst was prepared with industrial grade chemicals. The structural and physico-chemical properties were analyzed with X-ray diffraction （XRD）, scanning electron micrograph （SEM） and mercury porosimetry. The NOx conversion and durability were investigated on a pilot plant test set under the actual operational conditions of a coal fired boiler. The catalyst monolith had good formability with mass per- centage of V ： W ： Mo ： TiO2 ： fiber glass = 1 ： 4.5 ： 4.5 ： 72 ： 18. Vanadium, tungsten and molybdenum species were highly dispersed on anatase TiO2 without causing the transformation of anatase TiO2 to ruffle by calcining under a current of air at 450℃ for 4.5 h, but there were some degrees of crystal distortion. The catalyst particle sizes were almost uniform with close pile-up and the pore structure was regular with complete macro-pore formation and large specific surface area. The NOx conversion was sensitive to temperature but nearly insensitive to NH3. The catalyst showed strong adaptability to NOx concentration with activity above 80% in the range of 615 1640 mg.m-3. Within the range of 720-8640 h continuous operation, the NOx conversion dropped at a rate of about 1% reduction per 600 h. 展开更多
关键词 selective catalytic reduction V2O5-WO3-MoO3/ZiO2 catalyst physico-chemical property flue gas life time
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