Catalytic reduction of NO_x by CO on hydro- talcites-derived mixed oxides CoAlM and MgAlM (M = Cr, Mn, Fe, Co, Ni, Cu)

摘要

Two series of mixed oxides, CoAlM and MgAlM(M = Cr, 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 indicate that only MgO phase was observed after calcining MgAlM hydrotalcites, and the transition metals became more stable.