Process for preparation of catalysts useful for organic compounds convertion reactions

摘要

A catalyst used in the transformation reactions of organic compounds comprise a support, a metal of group VIII and an additional element M chosen from germanium, tin, lead, rhenium, gallium, indium, gold, silver and thallium. The incorporation of the element M in the catalyst is carried out by dissolving an organometallic compound comprising an M-carbon bond in an aqueous solvent. The catalyst is prepared by: (1) impregnating the support with an aqueous or organic solution of at least a metal of group VIII, filtering, drying, calcining in air and reducing under hydrogen at 20-600 degrees C, preferably 90-500 degrees C; and (2) impregnating the resulting product by an aqueous solution of the additional element M, filtering, drying, reducing and calcining. In the preparation of the catalyst, the support is impregnated with an aqueous solution of a compound of the element M, the volume of the aqueous solution being equal or greater than the retention volume of the support. The concentration of M in the aqueous solution of pH 10-14, preferably 10-12, is 0.01-25 mmol/l or 0.5-15 mmol. It is introduced during the elaboration of the catalyst.