A kind of preparation method of propylene oligomerization nonene catalyst

Abstract

The invention provides a preparation method of a catalyst for nonylene-producing propylene oligomerization, and belongs to the technical field of catalysts. The preparation method comprises the following steps: A, adding HZSM-5 molecular sieve powder to water to obtain a uniform slurry; B, adding active Al2O3 powder into the slurry obtained in the step A, placing in a constant-temperature water bath and stirring; C, uniformly adding a metal salt solution into the slurry obtained in the step B to obtain a mixed slurry, placing the mixed slurry into the constant-temperature water bath, reactingwhile stirring, drying, grinding and roasting to obtain a finished catalyst product. The molecular sieve and the aluminum oxide are mixed as a carrier, so that the problems that polyphosphoric acid inthe existing solid phosphoric acid catalyst for the nonylene-producing propylene oligomerization easily causes corrosion to equipment and the catalyst is easily powdered due to abrasion, easily minced due to hydrolysis and easily deactivated and the like are solved; meanwhile, metal is used for modifying the catalyst carrier, so that the strength of the catalyst is improved while the activity andthe selectivity of the catalyst are improved, powdering is further prevented, the abrasion resistance is improved, and thus the service life of the catalyst is prolonged and the cost of the catalystis reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a preparation method of a catalyst for producing nonene by propylene oligomerization. Background technique [0002] Propylene oligomerization nonene catalysts are commonly used in the industry as solid phosphoric acid catalysts (SPAC). This catalyst uses silica gel, diatomaceous earth, etc. Water vapor was continuously fed into the reactor to ensure its catalytic activity. [0003] The main preparation method of the solid phosphoric acid catalyst is to impregnate or knead the polyphosphoric acid and the carrier under certain conditions by using the impregnation and blending method, and then it is obtained through molding, drying, roasting and activation. The preparation process of solid phosphoric acid catalyst is relatively mature, and it has good catalytic activity. It is the most widely used catalyst at present, but its disadvantages are low mechanical strength, easy wear a...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the high corrosion of equipment due to the presence of polyphosphoric acid in the catalyst for the production of nonene from propylene oligomerization, the catalyst is easy to pulverize, and hydrolysis mudification occurs at the same time, resulting in catalyst deactivation and other problems

The present invention provides a preparation method of a nonene catalyst for propylene oligomerization, which uses a mixture of molecular sieve and alumina as a carrier, which solves the problem of catalyst corrosion, and at the same time, improves the activity and selectivity of the catalyst by modifying the carrier, and solves the problem of Catalyst pulverization and sludge deactivation problems