V2O5-WO3/TiO2SCR催化剂的失活机理及分析

被引：52

作者：

云端

宋蔷

姚强

机构：

[1] 清华大学热能工程系,热科学与动力工程教育部重点实验室

来源：

煤炭转化 | 2009年 / 32卷 / 01期

关键词：

SCR; 催化剂; 失活;

D O I：

暂无

中图分类号：

O643.36 [催化剂]; X701.3 [脱硫与固硫];

学科分类号：

摘要：

催化剂是SCR烟气脱硝技术的核心,减缓催化剂的失活速率,延长催化剂的寿命对于降低SCR系统的运行成本有着非常重要的意义.描述了国内外文献中涉及的SCR催化剂的失活现象,列举了导致催化剂失活的各项因素,比较了碱金属、碱土金属、As和P及HCl等物质的影响规律及因素,并在此基础上总结了各类文献中提到的中毒机理:碱金属通过减少Bronsted酸性位的数量和削弱Bronsted酸性位的酸性导致催化剂中毒,碱土金属则能够在催化剂表面沉积进而造成孔结构的堵塞,催化剂的砷中毒是由气态的砷的化合物不断聚积,堵塞进入催化剂活性位的通道引起的,而磷对于催化剂的影响体现在其能够减小活性位的数量上.针对特定的失活机理,可以通过优化催化剂的特性来减缓催化剂的失活速率.

引用

页码：91 / 96

页数：6

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