Catalyst for preparing acrylonitrile through propylene ammoxidation as well as preparation method and application of catalyst

Abstract

The invention relates to a catalyst for preparing acrylonitrile through propylene ammoxidation as well as a preparation method and application of the catalyst. The catalyst takes silicon dioxide in silica sol as a carrier, and contains an active component represented by a general formula of AaBbCcBidMo<13.2>Ox, wherein A is at least one selected from K, Rb and Cs; B is at least one of Ca, Mn, Fe, Co, Ni, Mg, W, Sr and Ba; C is at least one selected from rare earth elements La, Ce, Pr, Nd, Pm and Sm; the value range of a is 0.01 to 2.5; the value range of b is 1-15; the value range of c is 0.01 to 5; the value range of d is 0.01 to 3; x is the total number of oxygen atoms required for meeting the valence of each element in the catalyst. The prepared catalyst well solves the problem that domestic silica sol is difficult to be applied to acrylonitrile catalysts, and can be applied to industrial production of acrylonitrile through propylene ammoxidation.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a catalyst for producing acrylonitrile by ammoxidation of propylene, a preparation method and application thereof. Background technique [0002] Acrylonitrile is an important monomer of the three major synthesis, and it is mainly used to produce polyacrylonitrile fiber (acrylic fiber) at present. Secondly, it is used to produce ABS resin (copolymer of acrylonitrile-butadiene-styrene) and synthetic rubber (copolymer of acrylonitrile-butadiene). Acrylic acid obtained by the hydrolysis of acrylonitrile is the monomer for the synthesis of acrylic resin. Acrylonitrile is electrolytically hydrogenated to produce adiponitrile, which is the raw material for the production of nylon-66 and one of the important petrochemical products. In the existing synthetic method, the silica sol that adopts, the main problem that exists is: the domestic silica sol alkali metal impurity content is high, partic...

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Problems solved by technology

In the existing synthetic method, the silica sol that adopts, the main problem that exists is: the domestic silica sol alkali metal impurity content is high, particle size distribution is wide, and viscosity is big, and gelation time is short under high concentration, and the synthetic acrylonitrile catalyst and Compared with the catalyst synthesized with imported silica sol, the catalytic performance gap is obvious, so the production of domestic acrylonitrile catalyst is highly dependent on imported silica sol

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