| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1695272 | Applied Clay Science | 2012 | 7 Pages |
Acido-basic MMgAlO mixed oxide catalysts (M = Mn, Fe, Co, Ni, Cu and Zn) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors. They were characterized by XRD, EDX, nitrogen adsorption, TG-DTG, NH3-TPD and CO2-TPD experiments. The cyanoethylation of methanol was used as a model reaction to evaluate the basicity of the LDHs and the corresponding mixed oxides. Mixed oxides were much more active than their LDH precursors, while both were quite selective for β-metoxypropionitrile. A straight correlation between the number of basic sites of the mixed oxides determined by CO2-TPD and their catalytic activity was evidenced. However, the equilibrium between the acid and basic sites is a key factor determining the catalytic activity.
► Transition-metal containing LDHs as catalysts and catalyst precursors. ► Catalysts for cyanoethylation of methanol as a model of base catalyzed reaction. ► Mixed oxides much more active than their LDH precursors. ► Correlation between the number of basic sites of the mixed oxides and their activity. ► Key role played by the equilibrium between the acid and basic sites.
