Mesoporous MgO and Ni-MgO prepared by using carboxylic acids

摘要

MgO and NiO-MgO with large mesopores were prepared by using the corresponding nitrates and carboxylic acids.Their pore structures were characterized by N_2 adsorption,and reduced Ni-MgO samples were used in the liquid-phase hydrogenation of ketone.The mesopore size of MgO was controllable with the alkyl-chain length of the carboxylic acid inthe range between 13 and 38 nm.The mesopores are located at the MgO interparticles.In the hydrogenation of 4-heptanone to 4-heptanol,the catalytic activity of the Ni-Mgo,which had mesopores at 11 nm,prepared using dodecanoic acid was higher than that of a commercial Raney Ni with mesopores around 4 nm,while the Ni surface of the Ni-MgO was lower than that of a Raney Ni catalyst.At an optimum regulated size of mesopores,the Ni-MgO catalyst would show high catalytic activity satisfying both rapid mass transfer of the reactants and high dispersion of Ni metals on the catalyst surface.