Effect of hydrogen addition on SO2 tolerance of silver-alumina for SCR of NO with propane

被引：34

作者：

Shimizu, K ^{[1
]}

Higashimata, T ^{[1
]}

Tsuzuki, M ^{[1
]}

Satsuma, A ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

JOURNAL OF CATALYSIS | 2006年 / 239卷 / 01期

基金：

日本科学技术振兴机构;

关键词：

nitrogen oxides; silver alumina; reduction; sulfur oxide;

D O I：

10.1016/j.jcat.2006.01.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of H-2 addition and silver loading on the SO2 tolerance and de-NOx performance of Ag/Al2O3 for the C3H8-SCR reaction was investigated by catalytic testing combined with various characterization results. SO2 tolerance is improved by H-2 cofeeding as well as an increase in Ag loading of Ag/Al2O3. In situ IR results shows that the reaction of sulfates on Ag-containing sites with H-2 results in the desorption of SO2 or migration of the sulfates to alumina surface. TPD/TRP results show that sulfate desorption in He or in H-2 occurs at lower temperature for the higher loading sample. Combined with UV-vis and in situ IR results, these findings suggest that the higher SO2 tolerance of high loading catalyst for the H-2-C3H8-SCR reaction is caused by the higher rate of sulfate reduction that is more advantageous over partially reduced silversites than over Ag+ sites. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：117 / 124

页数：8

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