摘要
采用扫描电镜、X射线衍射、比表面分析、氨气-程序升温脱附法和活性检测模拟试验等对某电厂运行21 000 h的烟气选择性催化还原(SCR)催化剂的微观形貌、晶体结构、比表面积、孔径分布、表面酸量和表观活性进行检测,并与同批次新鲜催化剂进行对比。结果表明,催化剂长时间在高温、高尘环境下运行,性能发生变化,活性有所下降,比表面积和孔体积分别降低20.9%和4.39%,表面总酸量减少,部分区域出现铵盐结晶及颗粒团聚现象。在运催化剂表面富集的Na+、Ca2+、K+、NH4+、SO24-、As及表面V和W的流失,加快了催化剂性能劣化的趋势。依据在运催化剂样品的分析数据,结合各SCR系统的实际运行情况,提出SCR催化剂性能评价体系,有利于电厂进行SCR催化剂的优化管理。
The activity, crystal structure, specific surface area, pore size distribution, total acidity and sur- face performance of the SCR catalysts after running for 21 000 h in a certain power plant were character- ized by SEM,XRD,BET, NH3-TPD and the activity simulation experiment as well as the fresh catalyst. The results showed that the performance of the catalyst operated under high temperature and high dust en-vironment was changed. The activity was declined while the total acidity was decreased. The specific sur- face area and pore volume were reduced by 20.9% and 4.39% , respectively. The phenomenon of particle agglomeration appeared and the crystals of ammonium salts were formed on the catalyst surface. Na＋, Ca2＋ ,K ＋ ,NH4＋ ,SO24- and As deposited on the catalyst surface,and the loss of V and W quickened up the degradation of the catalyst performance. Based on the analytic data and the operation conditions of SCR system,the SCR catalyst evaluation system was put forward,which was in favor of the optimization and management of the SCR catalysts.
出处
《工业催化》
CAS
2013年第1期64-69,共6页
Industrial Catalysis
基金
长沙市科技计划重点项目(K1203059-11)
湖南省自然科学基金(11JJ3015)资助项目
关键词
催化剂工程
烟气脱硝
在运催化剂
活性检测
评价体系
catalyst engineering
flue-gas denitration
the used catalyst
activity detection
evaluationsystem
