Preparation method of catalyst used for heavy oil cracking

Abstract

The invention discloses a preparation method of a catalyst used for heavy oil cracking. The method comprises the following steps: uniformly mixing glacial acetic acid and an ethanol aqueous solution, adding dodecyltrimethoxysilane, heating the materials and stirring the materials, adding clay and toluene, continuously stirring the materials, heating the materials and performing backflow stirring, performing steps of filtering, washing, drying and crushing, adding deionized water and stirring the materials, adding diaspore and aluminium sol, beating the materials to obtain a first material; adjusting the pH value of a first material system to 0.7-1, stirring the materials, adjusting the pH value of the system to 5-5.8, slaking the material to obtain a second material; adding a molecular sieve in the second material, heating the materials, performing spray drying, calcining the materials, washing the materials, filtering the materials, and drying the material to obtain the catalyst used for heavy oil cracking. The preparation method is characterized in that the specific surface area of the catalyst is large, the appropriate aperture distribution and active center are in favor of diffusion and pre-cracking of heavy oil macromolecules, and the heavy oil cracking capability of the molecular sieve is increased.

Description

technical field [0001] The invention relates to the technical field of heavy oil cracking, in particular to a catalyst preparation method for heavy oil cracking. Background technique [0002] Researches on the processing technology of low-quality heavy oil are very active at home and abroad, mainly in the two fields of decarburization and hydrogenation. Among them, the decarbonization process is relatively mature, and the hydrogenation of low-quality heavy oil mostly adopts the hydrocracking process using catalysts. The macromolecular cracking of heavy oil The catalyst is mainly composed of active component molecular sieve and matrix. The matrix includes two parts: carrier (such as kaolin) and binder (such as aluminum sol, silica sol). The matrix is ​​the main material of catalytic cracking catalyst, accounting for more than 50% of the catalyst components. . In the early catalysts, the substrate was only used as a carrier, which mainly provided physical properties such as g...

AI Technical Summary

Problems solved by technology

Since the 1990s, the heavy and inferior quality of crude oil in the world has become increasingly serious. In order to make heavy oil molecules close to the active center of the catalyst and realize the orderly cracking of heavy oil macromolecules, in addition to the general carrier function of the matrix in the heavy oil catalytic cracking catalyst, It is necessary to provide a certain pore structure and active centers. The current catalysts cannot meet the needs and need to be solved urgently.