摘要
采用等体积浸渍法制备了一系列Keggin型杂多酸改性的V-Mo/Ti-W催化剂,并通过X射线衍射(XRD)、BET比表面分析(BET)、NH_(3)程序升温脱附(NH_(3)-TPD)、H_(2)程序升温还原(H_(2)-TPR)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FTIR)等表征方法对催化剂物化性质进行了表征分析。各项表征分析结果表明,杂多酸改性后的HPAs-V-Mo/Ti-W催化剂相比于改性前的催化剂,平均孔径尺寸更大,可抑制硫酸氢铵沉积,以提高催化剂抗硫性能;与V-Mo/Ti-W样品相比,改性后的催化剂具有更强的NH_(3)吸附能力、更好的还原性能和更多的化学吸附氧物种,从而表现出更优异的脱硝性能和N_(2)选择性。杂多酸改性后的催化剂在200~380℃温度范围内、150000h^(-1)高空速、高浓度SO_(2)和H_(2)O存在的模拟烟气中表现出高NH_(3)-SCR活性、优异的抗SO_(2)性能,并保持几乎100%的N_(2)选择性,可作为燃煤电厂深度调峰的宽温催化剂,具备良好的工业应用价值。
A series of Keggin heteropoly acid-modified V-Mo/Ti-W catalysts were prepared by incipient-wetness impregnation method and their physicochemical properties were investigated by using XRD,BET,NH_(3)-TPD,H_(2)-TPR,XPS and FTIR.The analysis indicated that heteropoly acid could inhibit the deposition of ammonium bisulfate by increasing the average pore diameter of the catalyst to improve its resistance to sulfur.Compared with V-Mo/Ti-W catalyst,the HPAs-modified V-Mo/Ti-W catalysts showed higher NH_(3)adsorption capacity,better reduction performance and more chemisorbed oxygen species,which provided better DeNO_(x) performance and N_(2)selectivity.The HPAs-modified V-Mo/Ti-W catalysts exhibited high NH_(3)-SCR activity and excellent SO_(2)resistance performance in a wide temperature range and almost 100%N_(2) selectivity in simulated atmosphere with high concentrations of SO_(2)and H_(2)O and under 150000h^(-1) gas space velocity.Hence,the HPAs-modified V-Mo/Ti-W catalysts can be used as promising wide-temperature catalysts for deep peak shaving in coal-fired power plants.
作者
周佳丽
马子然
赵俊平
马静
赵春林
李歌
王红妍
王宝冬
ZHOU Jiali;MA Ziran;ZHAO Junping;MA Jing;ZHAO Chunlin;LI Ge;WANG Hongyan;WANG Baodong(National Institute of Clean and Low-Carbon Energy,Beijing 102211,China;China Energy Hefeng Coal Power Co.,Ltd.,Tarbagatay Prefecture 834411,Xinjiang,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2022年第7期3615-3623,共9页
Chemical Industry and Engineering Progress
基金
北京市优秀人才培养资助青年骨干个人项目(2018000102592G366)
国家能源集团项目(ST930021011C)。
关键词
杂多酸
选择催化还原
催化剂
heteropoly acids
selective catalytic reduction(SCR)
catalyst
作者简介
第一作者:周佳丽(1992-),女,硕士,工程师,研究方向为环境催化。E-mail:jiali.zhou@chnenergy.com.cn;通信作者:马子然,博士,高级工程师,研究方向为环境材料及催化。E-mail:ziran.ma@chnenergy.com.cn;通信作者:王宝冬,博士,教授级高级工程师,研究方向为大气污染控制。E-mail:baodong.wang.d@chnenergy.com.cn。
