Fluidized-bed catalyst for preparing unsaturated nitrile by ammoxidation

Abstract

The invention relates to a fluidized-bed catalyst for preparing unsaturated nitrile by ammoxidation, and mainly solves the problems that in the prior art the lattice oxygen content of a catalyst for acrylonitrile is low, deep oxidation of propylene is easy to occur, the acrylonitrile selectivity is low to cause the low yield of the acrylonitrile. According to the fluidized-bed catalyst for preparing the unsaturated nitrile by ammoxidation, through use of a technical scheme, the problems are well solved. The technical scheme is shown as follows: the fluidized-bed catalyst uses silica sol as a carrier, and contains an active component represented by the following general formula: Mo[12]Bi[a]Fe[b]Ni[c]X[d]Y[e]Z[f]K[g]O[x], wherein b / (a+e)=1.0-3.5. The fluidized-bed catalyst can be used in industrial production of preparation of the acrylonitrile by ammoxidation of the propylene.

Description

technical field [0001] 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 [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 catalysts was mainly carried out from the aspects of catalyst activity and stability through the design of catalyst formulations, such as adding transition metals to active components to improve activity and increase product yield; adding rare earth elements to improve redox ability...

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that in the prior art, the content of acrylonitrile catalyst lattice oxygen is low, propylene is prone to deep oxidation, and the selectivity of acrylonitrile is low, resulting in a low yield of acrylonitrile. A new catalyst is provided Ammoxidation of Unsaturated Nitrile Fluidized Bed Catalyst