Catalyst for acrylonitrile production

Abstract

The invention discloses a catalyst for acrylonitrile production, relates to the technical field of catalysts for chemical production, and particularly relates to a catalyst for acrylonitrile production. The catalyst is characterized by comprising a compound of a basic body containing iron, bismuth, molybdenum, magnesium and carbon, an optional catalytic oxide containing one or more elements of lithium, sodium, potassium, rubidium, cesium, cobalt, nickel, strontium, manganese, calcium, barium, phosphorus, boron, antimony, chromium, tungsten and vanadium, and a catalyst carrier, and the general formula of the catalyst is AaBbMgcFedCeBifMogOx. According to the catalyst for acrylonitrile production, basic bodies of iron, bismuth, molybdenum, magnesium and carbon are arranged in the catalyst, and one or more of active elements of lithium, sodium, potassium, rubidium, barium, phosphorus, boron and the like are added in the catalyst, so that the overall activity of the catalyst is improved, the temperature and pressure required by the reaction of the catalyst are reduced, and the limitation on production equipment is reduced; therefore, the preparation cost is reduced, the temperature and pressure required by the reaction are reduced, and the safety during production is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production catalysts, in particular to a catalyst for acrylonitrile production. Background technique [0002] At present, the industrial production of unsaturated nitriles by ammoxidation of olefins still generally adopts the fluidized bed ammoxidation process. Catalyst is one of the core technologies of this process, and its research and improvement have been paid attention to all the time. At present, there are two main types of catalysts for industrial propylene ammoxidation to acrylonitrile: Mo-Bi series and Sb series, among which Mo-Bi series catalysts dominate, accounting for 95% of the olefin oxidation market. On Mo-Bi catalysts. By introducing metal components with variable valence states into the catalyst, such as Fe, Ce and other elements, the oxidation-reduction performance of the catalyst is improved, and the recovery of the effective state of the active component of the catalyst is ...

AI Technical Summary

Problems solved by technology

[0003] At present, the common catalysts for acrylonitrile production need to be used at relatively high temperature and pressure to maintain high activity and meet the catalytic requirements, resulting in strict production conditions for acrylonitrile, which further leads to a sharp increase in production costs. The preparation of acrylonitrile has certain potential safety hazards. In addition, the existing catalysts are usually carried on the catalyst carrier, such as spherical silica gel carrier, the catalyst is wrapped on the spherical carrier, but when the catalyst is used, only the outermost ring of the spherical carrier The catalyst can directly contact and react with the raw material of acrylonitrile, and the contact area is small, which leads to a slow overall reaction rate of the raw material of acrylonitrile, resulting in prolongation of the overall production cycle. Therefore, we propose a catalyst for the production of acrylonitrile to solve the above-mentioned problems