High dispersing supported type nickel catalyst prepared by lamellar precursor and preparation method thereof

Abstract

The present invention provides a high-dispersion loaded type nickel catalyst prepared by using lamellar precursor and its preparation method. Said invention uses Al2O3 as carrier, in the surface layer internal hole of Al2O3 the lamellar precursor hydrotalcite (LDHs) containing Ni metal ions is assembled so as to obtain the NiAl-LDHs / Al2O3 composite material, then the composite material is roasted at high temp. and unverted into the correspondent composite metal oxide. Before application the composite metal oxide is undergone the process of reduction treatment so as to obtain the loaded type Ni base catalyst in which the metal Ni is highly dispersed in the surface of internal hole of Al2O3 carrier. Said catalyst has high activity and selectivity, and can be used in catalytic hydrogenation reaction.

Description

Technical field:

[0001] The invention relates to a highly dispersed and supported nickel catalyst prepared from a layered precursor and a preparation method thereof. The catalyst is mainly used to catalyze the hydrogenation reduction of nitrobenzene to prepare aniline. technical background:

[0002] Industrially, two types of catalysts are mainly used to prepare aniline by catalytic hydrogenation reduction of nitrobenzene: supported noble metals such as Pd, Pt, Ru catalysts and Ni-based catalysts such as Raney nickel (Appl. Catal. A: General 2000, 202: 17). The Raney nickel catalyst needs to use a large amount of NaOH strong alkali solution in the preparation process, which has serious environmental pollution problems; while the use of noble metal catalysts is economically unacceptable. The development of new supported Ni-based hydrogenation catalysts that are cheap, efficient and non-polluting to the environment, avoiding the use of strong alkali solutions to improve enviro...