不同的WO3掺杂量对CeO_(2)的NH_(3)-SCR催化性能影响研究  

Effects of WO_(3) doping amounts of CeO_(2) on NH_(3)-SCR catalytic performance

作　　者：马赫遥 周曙光[2] 王晓祥[1] 杨鸣刚[2] 王瑜钢[2] 潘淑萍 李素静[1] 李伟[1] MA He-yao;ZHOU Shu-guang;WANG Xiao-xiang;YANG Ming-gang;WANG Yu-gang;PAN Shu-ping;LI Su-jing;LI Wei(Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang Xinan Chemical Industrial Group Co.Ltd.,Hangzhou 311600,China;Zhejiang Ecological and Environmental Monitoring Center,Hangzhou 310012,China)

机构地区：[1]浙江大学生物质化工教育部重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310027 [2]浙江新安化工集团股份有限公司,浙江杭州311600 [3]浙江省生态环境监测中心,浙江杭州310012

出　　处：《高校化学工程学报》2022年第2期242-248,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划(2017YFC0210904)。

摘　　要：针对二氧化铈(CeO_(2))活性低、活性温度范围窄的问题,提出了利用浸渍法合成不同三氧化钨(WO_(3))掺杂量的CeO_(2)催化剂的方法,发现4%WO_(3)/CeO_(2)(催化剂中W物质的量为Ce物质的量的4%)为最佳WO_(3)掺杂量的铈基催化剂。结果表明,该催化剂在150~425℃的宽温度区间表现出了90%以上的NO_(x)转化率和N_(2)选择性,同时也具有较好的抗SO_(2)和H_(2)O中毒性能。X射线光电子能谱(XPS)结果表明,4%WO_(3)掺杂能增加CeO_(2)表面化学活性氧物种,从而大幅提高中、低温催化活性。氨气程序升温脱附(NH_(3)-TPD)结果表明,4%WO_(3)掺杂能丰富CeO_(2)的表面酸性位、提高其酸性位强度,有利于反应物种的吸附和活化。因此,适量WO_(3)掺杂改性能够有效增强CeO_(2)的SCR催化性能。Synthesize of cerium dioxide(CeO_(2))catalysts with different WO_(3) doping amounts by impregnation was proposed to solve the problem of low activity and narrow reaction temperature window of CeO_(2).The results show that 4%WO_(3)/CeO_(2)(molar ratio)is the best cerium-based catalyst.The catalyst shows a NO_(x) conversion rate and N_(2) selectivity over 90%in a wide temperature range of 150-425℃,and also has excellent resistance to SO_(2) and H_(2)O poisoning.X-ray photoelectron spectroscopy(XPS)results show that 4%WO_(3) doping can increase CeO_(2) surface chemically active oxygen species,which greatly improves the catalytic activity at low and medium temperatures.Ammonia programmed temperature desorption(NH_(3)-TPD)results show that 4%WO_(3) doping can enrich CeO_(2) surface acid sites and acid site strength,which is more conducive to the adsorption and activation of reactive species.Therefore,proper doping of WO_(3) can effectively enhance SCR catalytic performance of CeO_(2).

关 键 词：WO_(3)掺杂 二氧化铈 化学活性氧物种 表面酸性 

分 类 号：X511[环境科学与工程—环境工程]