Nickel catalyst protection against oxidn. - by sorption of fat from soln. on internal surface to maintain hydrogenation activity during transport and storage

摘要

Protection of Ni catalyst (I) against oxidn. by atmos. O2 is achieved by chemi- and physisorption of an at least monomol. layer of fat from a soln. on the internal surface of (I), without completely filling the pores. An unsatd. soln. of the fat in a solvent is prepd. at a temp. T1, pref. above the m.pt. of the fat (mixt.), then the powdered catalyst is stirred into the soln., the suspension is cooled by 10-50 K and the solvent is pumped away. If the surface requirement is ca. 75 x 10-20 m2/fat mol., a 10-20 mol. layer with a thickness of (1-2) x 10-8 m is formed. The catalyst is pelleted under a pressure of 3-7 MPa, using a solid additive, which passes into the gaseous state below the operating temp. of the reactor in which the catalyst is used, or a hard fat. Catalyst retains its full hydrogenation activity during transport and storage. It is useful in hydrogenation, e.g. of fats.