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Catalytic reduction of NO x by CO on hydrotalcites‐derived mixed oxides CoAlM and MgAlM (M=Cr, Mn, Fe, Co, Ni, Cu)
Author(s) -
Yu Liu,,
XueZhong Wang,,
XiangGuang Yang,,
Yue Wu,
Publication year - 1999
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19990170607
Subject(s) - hydrotalcite , calcination , chemistry , catalysis , spinel , redox , nox , transition metal , inorganic chemistry , reaction mechanism , metallurgy , organic chemistry , materials science , combustion
Two series of mixed oxides, GIAlM and MgAlM (M= G, Mn, Fe, Co, Ni, Cu), were prepared by calcining their corresponding hydrotalcite‐like compounds (HTLc). The ratio of Mg: Al: M (or Co: Al: M) was 3:1:1. The catalytic activity of all samples for the reaction of NO + CO was investigated. The results showed that the activity of CoAlM was much higher than that of MgAlM. The structure and the property of redox were characterized by XRD and H 2 ‐TPR. The results indicated that only MgO phase was observed after calcining MgAlM hydrotalcites, and the transition metals became more stable. The spinel‐like phase appeared in all of CoAlM samples after the calcination, and the transition metals were changed to be more active, and easily reduced. The activities of three series of mixed oxides CoAlCu obtained from different preparation methods, Different ratio of Co: Al: Cu and at different calcination temperatures. were studied in detail for proposing the mechanism of reaction. The ability of adsorption of NO and CO were investigated respectively for supporting the mechanism.