Liquid-phase Hydrogenation of Ketones over Mesoporous Ni-MgO Catalysts Prepared by Using Fatty Acids

摘要

MgO and NiO-MgO with large mesopores were prepared by using fatty acids. The pore size of MgO increased with increasing alkyl-chain length of fatty acids. Each fatty acid was coordinated with Mg to form an organic-inorganic complex, and the complex formed lamella mesophase in the precursor heated at 170 deg C. The lamella mesophase, however, collapsed by removing fatty acid during calcination at 400 deg C. The calcined MgO consisted of the aggregates of crystallites, and the mesopores were located at interparticles. Ni-MgO catalyst with large mesopores (NM-b) was prepared by using the mesoporous MgO as a catalyst support. The catalytic activity of NM-b was higher than that of a commercial Raney Ni catalyst in the liquid-phase hydrogenation of 4-heptanone. Since the pore size of NM-10 was larger than that of Raney Ni, the Ni-MgO with large mesopores is probably effective in rapid mass-transfer of the reactants.