Abstract
A highly basic solid catalyst was obtained by dispersing nitrate or carbonate of Group 1 elements such as KNO 3 , CsCO 3 and nitrate of Group 2 elements such as Ca(NO 3 ) 2 over alumina and zirconia at the surface density of 10–15 cations nm −2 and activating them at 773–873 K, that is far below the decomposition temperature of carbonates, in an inert atmosphere. The basic center may be composed of the oxygen anions liberated from the decomposition of nitrate or carbonate anions that was dissociatively adsorbed on the support surface during the preparation. The catalysts derived from the carbonate of Group 2 elements are also highly basic, though the process of the basicity generation is different from that of nitrate of Group 1 and 2 elements and carbonate of Group 1 elements.
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