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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：21
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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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Effect of Ce doping of TiO_2 support on NH_3-SCR activity over V_2O_5–WO_3/CeO_2–TiO_2 catalyst 认领 引用 被引量：30
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作者 Kai Cheng Jian Liu +5 位作者 Tao Zhang Jianmei Li Zhen Zhao Yuechang Wei Guiyuan Jiang Aijun Duan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第10期2106-2113,共8页
CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction（SCR） of NOx with NH3 were p... CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction（SCR） of NOx with NH3 were prepared by an incipient-wetness impregnation method. These catalysts were characterized by means of BET, XRD, UV–Vis,Raman and XPS techniques. The results showed that the catalytic activity of V2O5–WO3/TiO2 was greatly enhanced by Ce doping（molar ratio of Ce/Ti = 1/10） in the TiO2 support.The catalysts that were predominantly anatase TiO2 showed better catalytic performance than the catalysts that were predominantly fluorite CeO2. The Ce additive could enhance the surface adsorbed oxygen and accelerate the SCR reaction. The effects of O2 concentration, ratio of NH3/NO, space velocity and SO2 on the catalytic activity were also investigated. The presence of oxygen played an important role in NO reduction. The optimal ratio of NH3/NO was 1/1 and the catalyst had good resistance to SO2 poisoning. 展开更多
关键词 CeO2–TiO2 SCR Nitrogen oxides Homogeneous precipitation method SO2poisoning
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Novel CeO_2@TiO_2 core–shell nanostructure catalyst for selective catalytic reduction of NOx with NH_3 认领 引用 被引量：22
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作者 Bingjie Huang Danqing Yu +1 位作者 Zhongyi Sheng Liu Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第5期129-136,共8页
The CeO2@TiO2 core-shell nanostructure catalyst prepared by a two-step hydrothermal method was used for selective catalytic reduction （SCR） of NOx with NH3 in this study. The catalyst presented the obvious core-shel... The CeO2@TiO2 core-shell nanostructure catalyst prepared by a two-step hydrothermal method was used for selective catalytic reduction （SCR） of NOx with NH3 in this study. The catalyst presented the obvious core-shell structure, and the shell was amorphous TiO2 which could protect the active center from the SO2 erosion. The catalyst showed high activity and stability, excellent N2 selectivity and superior SO2 resistance and H2O tolerance. Characterizations such as TEM, HR-TEM, XRD, BET, XPS, NH3-TPD, and H2-TPR were carried out. The results indicated that the catalyst had large surface area and the active sites were well dispersed on the surface. The NH3-TPD, H2-TPR and XPS results implied that its increased SCR activity might be due to the enhancement of NH3 chemisorption and the increase of active oxygen species, both of which were conductive to NH3 activation. The excellent catalytic performance suggests that it is a promising candidate for SCR catalyst. 展开更多
关键词 SCR Core-shell SO2 resistance CeO2 TiO2
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CeO_2-TiO_2复合氧化物的气敏催化性能 认领 引用 被引量：2
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作者 傅军 何平 董名友 《Journal of Semiconductors》 CAS 北大核心 2002年第3期311-314,共4页
采用溶胶 -凝胶法制备 Ce O2 - Ti O2 复合氧化物催化剂 ,取代贵金属催化剂在不同工艺下制备气敏催化元件 ,研究在 C4 H1 0 气氛中催化剂浓度和制备工艺对气敏催化性能的影响 .结果表明 ,Ce O2 - Ti O2 复合氧化剂具有气敏催化活性 ,用... 采用溶胶 -凝胶法制备 Ce O2 - Ti O2 复合氧化物催化剂 ,取代贵金属催化剂在不同工艺下制备气敏催化元件 ,研究在 C4 H1 0 气氛中催化剂浓度和制备工艺对气敏催化性能的影响 .结果表明 ,Ce O2 - Ti O2 复合氧化剂具有气敏催化活性 ,用它制作的催化元件的灵敏度与催化剂浓度、载体焙烧温度及表面改性等因素有关 .选择最佳制备条件 ,其灵敏度相当于贵金属催化剂的灵敏度 。 展开更多
关键词 复合氧化物 催化元件 灵敏度 气敏催化性能 COTO
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CeO_2/TiO_2纳米管催化剂脱硝性能研究 认领 引用 被引量：3
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作者 杨波 何汉兵 《化工环保》 CAS CSCD 北大核心 2019年第1期40-44,共5页
利用废气中本身含有的CO催化还原烟气中的NO_x,可以实现以废治废。采用TiO_2纳米管负载CeO_2,制备CeO_2/TiO_2纳米管催化剂,并对其进行了SEM表征及影响因素实验。实验结果表明:在n(Ce)∶n(Ti)=3∶7、焙烧温度500℃、焙烧时间3 h时制备的... 利用废气中本身含有的CO催化还原烟气中的NO_x,可以实现以废治废。采用TiO_2纳米管负载CeO_2,制备CeO_2/TiO_2纳米管催化剂,并对其进行了SEM表征及影响因素实验。实验结果表明:在n(Ce)∶n(Ti)=3∶7、焙烧温度500℃、焙烧时间3 h时制备的CeO_2/TiO_2纳米管催化剂形貌较好,表面颗粒分布相对均匀;反应温度400～600℃时NO脱除率达98%;该催化剂具有一定的抗氧性能;当n(SO_2)∶n(NO)=(1∶2)～(2∶1)时,NO脱除率仍然在95%以上。 展开更多
关键词 TiO2纳米管 CeO2 选择性催化还原(SCR) 烟气脱硝
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基于钛锡载体的SCR低温脱硝催化剂的表面性质研究 认领 引用 被引量：3
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作者 郭婉秋 张亚平 +5 位作者 王文选 赵明 王俊杰 沈凯 王龙飞 杨林军 《燃料化学学报》 CSCD 北大核心 2015年第11期1393-1401,共9页
采用共沉淀法制备TiO2-SnO2固溶体,浸渍法负载CeO2得到一系列xCeO2/TiO2-SnO2负载型催化剂,在模拟NH3选择性催化还原NOx（NH3-SCR）反应条件下考察催化剂低温脱硝活性。通过X射线衍射（XRD）、比表面积测定（BET）、程序升温还原（H2-TP... 采用共沉淀法制备TiO2-SnO2固溶体,浸渍法负载CeO2得到一系列xCeO2/TiO2-SnO2负载型催化剂,在模拟NH3选择性催化还原NOx（NH3-SCR）反应条件下考察催化剂低温脱硝活性。通过X射线衍射（XRD）、比表面积测定（BET）、程序升温还原（H2-TPR）、程序升温脱附（NH3-TPD）、高分辨率透射电子显微镜（HRTEM）、原位漫反射傅里叶变换红外光谱（in situ DRIFTS）等表征技术,研究了氧化铈负载后催化剂的微观结构、表面物种的存在状态、表面酸位等表面性质及NH3吸附特性。结果表明,Ce∶Ti物质的量比为0.1时,催化剂催化脱硝反应活性最高,同时具有较宽的温度窗口（250-300℃）和热稳定性;铈的过量负载会导致催化剂比表面积减小、活性窗口变窄,同时其氧化还原能力和NH3吸附能力也减弱。NH3-TPD结果显示,CeO2的负载导致催化剂NH3在弱酸及中等酸位的吸附显著增强,与催化剂NH3-SCR最佳反应物温度降低有关。in situ DRIFTS表明,xCeO2/TiO2-SnO2催化剂的Lewis酸位和Bronsted酸位强度均明显增强,同时,在1657-1666cm^-1处出现新的Bronsted酸位,参与SCR反应的主要物质是NH4^＋分子。 展开更多
关键词 CeO2 TiO2-SnO2固溶体 SCR低温脱硝 表面性质 NH3吸附
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