Nickel-based molecular sieve catalyst and preparation method of same

Abstract

The invention provides a nickel-based molecular sieve catalyst and a preparation method of same. The nickel-based molecular sieve catalyst includes: a component (A): a molecular sieve carrier, a component (B): nickel metal, and a component (C): including one or more selected from the following metals: Mg, Ca, Cr, Bi, Ce, Sn, Cd and Cu, wherein the metals in the components (B) and (C) are supported on a framework structure of the component (A) in the form of metal oxides; the component (B) and the component (C) are respectively measured by mass of the metal oxides; and the mass ratio of the component (A), the component (B) to the component (C) is (75-98):(1-20):(0.5-10). The nickel-based molecular sieve catalyst is produced through a chemical method and has uniform distribution of active components. The catalyst is high in conversion rate of adiponitrile and selectivity of hexanediamine when being sued for catalyzing the adiponitrile to produce the hexanediamine.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysis, and in particular relates to a nickel-based molecular sieve catalyst and a preparation method thereof. Background technique [0002] Raney catalyst is a widely used reduction catalyst, mainly used in the catalytic hydrogenation of organic compounds. According to the different metal active centers, there are Raney iron, Raney cobalt, Raney nickel, etc. Among them, the Raney nickel catalyst with nickel as the active center is the most widely used. For example, hexamethylenediamine is used as a monomer for the production of nylon-66. At present, adiponitrile is mainly used as a raw material, and Raney nickel catalyst is used to prepare it in a tank reactor or a fluidized bed reactor. At present, the main problems of this catalyst are low activity and selectivity, large amount of catalyst, and serious environmental pollution. Therefore, it is necessary to develop new and more efficie...

AI Technical Summary

Problems solved by technology

At present, the main problems of this catalyst are low activity and selectivity, large amount of catalyst, serious environmental pollution, etc. Therefore, it is necessary to develop new and more efficient catalyst materials to improve the yield of hexamethylenediamine products and achieve atom economy.

[0003] At present, there are mainly the following methods for modifying the Raney catalyst: one is to add a modifier to melt during the preparation of the parent alloy, and then crush and activate it to obtain it. The disadvantage is that the high-temperature melting of the alloy consumes a lot of energy; After the modifier is added in the preparation process, the catalyst is modified by means of ultrasonic treatment. The disadvantage is that the performance improvement of the catalyst by ultrasonic treatment alone is small; the third is to use the impregnation method to modify the prepared catalyst. The catalyst uniformity is poor