Unsaturated nitrile fluid catalyst prepared by ammoxidation

Abstract

The invention relates to an unsaturated nitrile fluid catalyst prepared by ammoxidation, mainly solving the problems of high by-products, poor selectivity and low acrylonitrile yield of an acrylonitrile catalyst in the prior art. In the invention, SiO2 is adopted as a carrier, and contained active components are expressed through the following general formula: Mo12BiaFebNicXdYeZfQgOx, wherein X is selected from at least one of Mg, Co, Ca, Be, Cu, Zn, Pb, Mn or Te; Y is selected from at least one of La, Ce or Sm; Z is selected from one of K, Rb, Li or Cs; and Q is selected from one of Al, Ti or Th. The technical scheme for preparing the catalyst better solves the problems and can be applied to industrial production for producing the acrylonitrile by propylene ammoxidation.

Description

technical field The invention relates to a fluidized bed catalyst for preparing unsaturated nitrile by ammoxidation, in particular to a fluidized bed catalyst for preparing acrylonitrile and butenenitrile by ammoxidation of propylene and butene. Background technique 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 a...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is that there are high by-products in the reaction of acrylonitrile catalysts in the prior art, the selectivity is not good enough, and the yield of acrylonitrile is not high, and a new fluidized bed catalyst for preparing unsaturated nitrile by ammoxidation is provided

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