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Catalytic performance of highly dispersed WO_3 loaded on CeO_2 in the selective catalytic reduction of NO by NH_3 认领 引用 被引量：9
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作者 Lei Zhang Jingfang Sun +3 位作者 Yan Xiong Xiaoqing Zeng Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第10期1749-1758,共10页
The influence of tungsten trioxide(WO3)loading on the selective catalytic reduction(SCR)of nitric oxide(NO)by ammonia(NH3)over WO3/cerium dioxide(CeO2)was investigated.The NO conversion first rose and then declined wi... The influence of tungsten trioxide(WO3)loading on the selective catalytic reduction(SCR)of nitric oxide(NO)by ammonia(NH3)over WO3/cerium dioxide(CeO2)was investigated.The NO conversion first rose and then declined with increasing WO3loading.It was found that the crystalline WO3in the1.6WO3/CeO2sample could be removed in25wt%ammonium hydroxide at70°C,which improved the catalytic activity of the sample.The obtained samples were characterized by X‐ray diffraction,Raman spectroscopy,X‐ray photoelectron spectroscopy,hydrogen(H2)temperature programmed reduction,NH3temperature programmed desorption,and in situ diffuse reflectance infrared Fourier transform spectroscopy.The results revealed that the dispersed WO3promoted the catalytic activity of WO3/CeO2while the crystalline WO3inhibited catalytic activity.The oxygen activation of CeO2was inhibited by the coverage of WO3,which weakened NO oxidation and adsorption of nitrate species over WO3/CeO2.In addition,the NH3adsorption performance on CeO2was improved by modification with WO3.NH3was the most stable adsorbed species under NH3SCR reaction conditions.In situ DRIFT spectra suggested that the NH3SCR reaction proceeded via the Eley‐Rideal mechanism over WO3/CeO2.Thus,when the loading of WO3was close to the dispersion capacity,the effects of NH3adsorption and activation were maximized to promote the reaction via the Eley‐Rideal route. 展开更多
关键词 NH3 selective catalytic reduction WO3/CeO2 catalyst WO3 state Dispersion capacity Diffuse reflectance infrared Fourier transform spectroscopy
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Influence of calcination temperature on selective catalytic reduction of NO_x with NH_3 over CeO_2-ZrO_2-WO_3 catalyst 认领 引用 被引量：16
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作者 李军燕 宋忠贤 +4 位作者 宁平 张秋林 刘昕 李昊 黄真真 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期726-735,共10页
A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction （SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure... A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction （SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure, surface acidity and redox behavior of CeO2-ZrO2-WO3 catalyst was investigated using various characterization methods. It was found that the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃ showed the best catalytic performance and excellent N2 selectivity, and yielded more than 90% NO conversion in a wide temperature range of 250-500 ℃ with a space velocity （GHSV） of 60000 131. As the calcination temperature was increased from 400 to 600 ℃, the NO conversion obviously increased, but decreased at higher calcination temperature. The results implied that the higher surface area, the strongest synergistic interaction, the superior redox property and the highly dispersed or amorphous WO3 species contributed to the excellent SCR activity of the CeO2-ZrO2-WO3 catalyst calcined at 600℃. 展开更多
关键词 CeO2-ZrO2-WO3 selective catalytic reduction calcination temperature amorphous synergistic interaction rare earths
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CeO2与WO3协同作用对CeO2-WO3催化剂脱硝性能影响的研究 认领 引用 被引量：1
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作者 宋忠贤 杜慧显 +7 位作者 赵保林 刘雪平 康海彦 刘彪 毛艳丽 扶咏梅 刘盼 郭一飞 《燃料化学学报》 CSCD 北大核心 2019年第9期1129-1136,共8页
采用原位自组装法分别制备纯CeO2、WO3和CeO2-WO3(CW)催化剂,并研究其NH3选择性催化还原NOx的催化活性。结果表明,WO3的加入使得CW催化剂以微孔为主且具有最大的孔容和较大的比表面积,提高了其催化性能。WO3的加入增强了Ce和W之间的相... 采用原位自组装法分别制备纯CeO2、WO3和CeO2-WO3(CW)催化剂,并研究其NH3选择性催化还原NOx的催化活性。结果表明,WO3的加入使得CW催化剂以微孔为主且具有最大的孔容和较大的比表面积,提高了其催化性能。WO3的加入增强了Ce和W之间的相互作用,显著地提升了Ce^3+和Oα的含量。CW催化剂具有最多的酸性位点。因此,CW催化剂催化活性最好,在250-400℃温度下NOx转化率为100%。 展开更多
关键词 WO3 CeO2 选择性催化还原 表面酸性 氧化还原能力
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xCeO2-yWO3-TiO2脱硝催化剂的制备与性能 认领 引用 被引量：3
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作者 边雪 胡吕 +1 位作者 彭朋 刘思洋 《东北大学学报（自然科学版）》 EI CAS CSCD 北大核心 2019年第12期1716-1720,共5页
我国面临着大气污染物氮氧化物排放限制要求,以及商业催化剂(V2O5-WO3/TiO2)危废处理困难等问题.以工业偏钛酸为钛源,采用共沉淀法制备了xCeO 2-yWO3/TiO2催化剂,研究了活性组分Ce,W含量对催化剂脱硝效率的影响,其中30Ce4W催化剂脱硝率... 我国面临着大气污染物氮氧化物排放限制要求,以及商业催化剂(V2O5-WO3/TiO2)危废处理困难等问题.以工业偏钛酸为钛源,采用共沉淀法制备了xCeO 2-yWO3/TiO2催化剂,研究了活性组分Ce,W含量对催化剂脱硝效率的影响,其中30Ce4W催化剂脱硝率90%和95%的温度区间最宽分别达到了310℃和285℃.采用XRD,XPS,BET,NH 3-TPD,H2-TPR等测试方法对催化剂结构及脱硝性能机理进行表征.结果表明,30Ce4W催化剂表面较高的Ce^4+占比和化学吸附氧含量、较高的比表面积有利于提高脱硝性能,且该催化剂表面氧化物更容易被还原并对NH 3的吸附能力较大,因此其脱硝效果最佳. 展开更多
关键词 NH3-SCR CeO2-WO3/TiO2 烟气脱硝 偏钛酸 共沉淀法
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Activity and hydrothermal stability of CeO_2–ZrO_2–WO_3 for the selective catalytic reduction of NO_x with NH_3 认领 引用 被引量：7
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作者 Zhongxian Song Ping Ning +5 位作者 Qiulin Zhang Hao Li Jinhui Zhang Yancai Wang Xin Liu Zhenzhen Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第4期168-177,共10页
A series of CeO2–ZrO2–WO3（CZW）catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction（SCR）of NO with NH3 over a wide temperature of 150–550℃.... A series of CeO2–ZrO2–WO3（CZW）catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction（SCR）of NO with NH3 over a wide temperature of 150–550℃.The effect of hydrothermal treatment of CZW catalysts on SCR activity was investigated in the presence of 10% H2O.The fresh catalyst showed above 90% NOx conversion at 201–459℃,which is applicable to diesel exhaust NOx purification（200–440℃）.The SCR activity results indicated that hydrothermal aging decreased the SCR activity of CZW at low temperatures（below 300℃）,while the activity was notably enhanced at high temperature（above 450℃）.The aged CZW catalyst（hydrothermal aging at 700℃ for 8 hr）showed almost 80% NOx conversion at 229–550℃,while the V2O5–WO3/TiO2 catalyst presented above 80% NOx conversion at 308–370℃.The effect of structural changes,acidity,and redox properties of CZW on the SCR activity was investigated.The results indicated that the excellent hydrothermal stability of CZW was mainly due to the CeO2–ZrO2 solid solution,amorphous WO3 phase and optimal acidity.In addition,the formation of WO3 clusters increased in size as the hydrothermal aging temperature increased,resulting in the collapse of structure,which could further affect the acidity and redox properties. 展开更多
关键词 CeO2–ZrO2–WO3 Hydrothermal stability Solid solution Acidity
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V_2O_5-WO_3-CeO_2/TiO_2催化剂的制备及其脱硝性能 认领 引用 被引量：3
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作者 崔晶 黄华存 +1 位作者 董文华 安学文 《化工环保》 CAS CSCD 北大核心 2019年第2期178-183,共6页
采用一步浸渍法和分步浸渍法分别制备了V_2O_5-WO_3-CeO_2/TiO_2催化剂,考查了其脱硝性能、抗SO_2中毒性能和脱硝活性稳定性,并通过SEM、EDS、XRD、激光拉曼等技术对催化剂进行了表征。实验结果表明:分步浸渍法制备的催化剂的脱硝活性... 采用一步浸渍法和分步浸渍法分别制备了V_2O_5-WO_3-CeO_2/TiO_2催化剂,考查了其脱硝性能、抗SO_2中毒性能和脱硝活性稳定性,并通过SEM、EDS、XRD、激光拉曼等技术对催化剂进行了表征。实验结果表明:分步浸渍法制备的催化剂的脱硝活性优于一步浸渍法,且抗SO_2中毒能力更强;在m(V_2O_5)∶m(WO_3)∶m(CeO_2)∶m(TiO_2)=1∶5∶10∶100时催化剂脱硝活性最佳,且具有良好的脱硝活性稳定性。表征结果显示,分步浸渍法与一步浸渍法制备的催化剂晶型结构相差不大,而分步浸渍法制备的催化剂颗粒粒径更小、更均匀,催化剂中Ce、O、V和W元素的含量更高。 展开更多
关键词 选择性催化还原 CeO2 V2O5-WO3-CeO2/TiO2催化剂 分步浸渍法 一步浸渍法 脱硝活性
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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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Novel promoting effects of cerium on the activities of NO_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts 认领 引用 被引量：15
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作者 房志涛 林涛 +3 位作者 徐海迪 吴干学 孙萌萌 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期952-959,共8页
A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic re... A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2. 展开更多
关键词 NH3-SCR NO cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths
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