排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
MnOx-TiO2,CeO2-MnOx-TiO2 and V2O5-MnOx-TiO2 catalysts for low-temperature NH3-SCR were prepared by sol-gel method.The results showed that both cerium and vanadium prevented the transformation of anatase TiO2 to the rutile phase.The addition of vanadium oxide induced the segregation of crystalline Mn2O3,which contributed little to low-temperature SCR and ammonia oxidation,from the MnOx-TiO2 solid solutions.However,the selectivity of the V-containing catalyst was almost 100% due to the decreased ammonia consump-tion and enhanced adsorption capacity of ammonia on Br(?)nsted acid sites at relatively high temperatures.The electron-donating effect of ce-rium reduced the Mn4+/Mn3+ ratio to some extent,resulting in a decreased activity for ammonia oxidation.This,in combination with the en-hanced ammonia adsorption capacity by Cen+ as additional Lewis acid sites,endowed the Ce-doped catalyst a higher N2 selectivity than MnOx-TiO2 despite the slightly elevated light-off temperature for NO conversion. 相似文献
2.
3.
4.
有人说,北京溢香斋酿造厂是当今北京酿造行业的一支新秀,其产品正走入北京市民的千家万户,外埠客户对此也津津乐道,同行称该厂的酱油、醋品味纯正,香溢万家. 相似文献
1