期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108925
关键词
Nitrogen oxides; NH3-SCR; Acidic promoter; Fe; Zr catalyst
资金
- National Natural Science Foundation of China [52174298, 51874058]
- Chongqing Talents Plan for Young Talents [CQYC201905017]
- Chongqing Human Resources and Social Security Bureau [cx2020028]
This study investigated the effects of MoO3 and WO3 on the selective catalytic reduction performance of Fe/Zr catalyst. It was found that WO3 might promote the catalytic activity by improving the redox property and surface acidity.
MoO3 and WO3, as acidic promoter, were widely used in the modification of vanadium based and vanadium-free based catalysts, which could significantly ameliorate the catalytic performance of the catalysts. In this work, the effects of MoO3 and WO3 on the selective catalytic reduction (SCR) performance of Fe/Zr catalyst were studied, and the role of acidic promoters was clarified. The results indicated that MoO3 and WO3 could improve the catalytic activity of Fe/Zr catalyst in the entire reaction temperature range. Noteworthy, Fe/Zr-W catalyst exhibited the highest SCR catalytic activity, and the NOx conversion rate achieved nearly 100% at 250 degrees C. The characterization results suggested that the promoting effect of WO3 on catalytic performance of Fe/Zr catalyst might be due to the improvement of redox property and surface acidity, higher Fe3+/(Fe2++Fe3+) ratio and abundant surface chemisorbed oxygen. The in-situ DRIFTS experiments indicated that both E-R and L-H mech-anisms were obeyed on Fe/Zr-W catalyst, while only E-R mechanism was obeyed on Fe/Zr and Fe/Zr-Mo cat-alysts in the NH3-SCR reaction at 250 degrees C. This study might provide an alternative development of high-performance vanadium-free catalyst for NOx abatement.
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