Method for preparing unsaturated nitrile catalyst using with ammoxidation method

Abstract

The present invention relates to a preparation method of an unsaturated nitrile catalyst, which is produced by an ammoxidation. The present invention mainly solves the problems in the prior art that in the ammoxidation, an ammonia conversion rate is low; the remnants ammonia is high; carbonyl by-products, such as acrolein etc, are high. The present invention solves the problems well by a technical proposal that SiO2 is used as a carrier, and the catalyst consists of a combination is adopted which contains active components and which is expressed by the following general formula: in the formula of Mo12BiaFebNicXdYeZfOx, the X is selected from at least one of Mg, Co, Ca, Cu, Zn, Pb, Mn, Cr, Nb, Zr, Ti, Sn or Ru; the Y is selected from at least one of La, Ce, Sm or Ge; the Z is selected from at least one of K, Rb, Na, Cs, In, Tl or Ag, and at least one of an organic compound which contains active-oh and can mutually react with a silica sol is added into an initial material in the process of the catalyst preparation. The present invention can be used for the industrial production of unsaturated nitrile, which is produced by an olefin ammoxidation.

Description

technical field [0001] The invention relates to a method for preparing an unsaturated nitrile catalyst by ammoxidation of olefins and olefins. Background technique [0002] The ammoxidation of olefins to prepare α and β unsaturated nitriles was developed by BP in the 1960s. The core technology of this process is to use a catalyst whose active components contain Mo and Bi. After continuous improvement, the Mo-Bi series catalyst is very mature at present, and the process of preparing acrylonitrile by ammoxidation of propylene has been widely used in industry. In the past, the improvement of the catalyst was mainly carried out from the aspects of the activity and stability of the catalyst, such as adding transition metals to the active component to improve the activity and increase the yield of the product; adding rare earth elements to improve the redox ability; adding elements such as Na and P To improve the wear resistance of the catalyst; add Fe, Co, Ni and other elements ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low ammonia conversion rate, high residual ammonia, a

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