Optimization of Promoter and Support for Co-based/zeolites Catalysts in Catalytic Reduction of NO x by CH 4

Catalytic behavior of Co-based/zeolites catalysts was investigated in NO reduction by CH . Optimization of promoter and support was investigated by catalytic tests, and the relationship between catalytic activity and catalyst structure was illustrated by catalyst characterization. Co-Fe/SAPO-34 exhi...

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Bibliographic Details
Published inHuanjing kexue Vol. 38; no. 7; p. 3085
Main Authors Pan, Hua, Jian, Yan-Fei, Chen, Ning-Na, Liu, Hong-Xia, He, Chi, He, Ya-Fei
Format Journal Article
LanguageChinese
Published China 08.07.2017
Subjects
catalytic reduction
Co-based/zeolites
NOx
promoter
support
CH4
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Summary:Catalytic behavior of Co-based/zeolites catalysts was investigated in NO reduction by CH . Optimization of promoter and support was investigated by catalytic tests, and the relationship between catalytic activity and catalyst structure was illustrated by catalyst characterization. Co-Fe/SAPO-34 exhibited the highest activity among various Co-base/zeolites catalysts. The maximum conversion of NO with 52.7% was obtained on Co-Fe/SAPO-34 at 450℃. The inhibition of activity of Fe/zeolites became severe in the presence of SO , CO , and H O. CO exerted virtually no effect on the SCR activity of Co-Fe/zeolites. The inhibition of NO conversion by H O was reversible for Co-Fe/zeolites catalysts. Cobalt species were mainly present in CoO and Co(OH) states in Co-Fe/SAPO-34. Co O and Co(OH) were the main cobalt species of Co-Fe/ZSM-5, while CoO, CoAl O and Co O might be present in Co-Fe/Beta. The ratio of Fe /Fe in the surface layer of Co-Fe/zeolites decreased in the order of Co-Fe/ZSM-5(3.98) > Co-Fe/SAPO-34(0.52) > Co-
ISSN:0250-3301