A kind of preparation method of fluid catalytic cracking catalyst

Abstract

A preparation method of a fluid catalytic cracking catalyst, comprising the following steps: (1) mixing and beating a certain amount of clay, silicon source, aluminum source, hydrochloric acid and deionized water according to the formula requirements, adding NaY molecular sieves and mixing uniformly to obtain The material is sent to the spray drying system to dry and form the catalyst powder; (2) mix the catalyst powder with the ammonium / rare earth salt to be exchanged and stir evenly, and heat at a temperature of 90-600°C for at least 1 hour, cooling, washing, drying, and roasting under 100% water vapor at a temperature of 500-700 DEG C; (3) exchanging the rare earth salt solution of the material obtained in step (2) to obtain an ultra-stable molecular sieve catalyst containing rare earth. The method provided by the invention can effectively maintain the original grain size of the molecular sieve in the catalyst, improve the dispersibility and crystallinity of the molecular sieve; improve the activity of the molecular sieve in the catalyst; effectively reduce material running loss, reduce the amount of salt used in the molecular sieve modification process, Reduce production costs and protect the environment.

Description

technical field [0001] The invention relates to a preparation method of a hydrocarbon fluidized cracking catalyst containing an ultra-stable molecular sieve. Background technique [0002] Heavy oil catalytic cracking is an important petroleum processing technology, in which cracking catalyst plays a pivotal role. The current cracking catalyst is generally prepared by mixing the matrix and the active component, beating, spray drying and molding to obtain the product. The so-called matrix materials include kaolin, alumina, silica sol, aluminum sol, sodium metaaluminate, aluminum sulfate, water glass, sepiolite, and some other clays. The substrate of the cracking catalyst is generally composed of two or more than two kinds of the above-mentioned materials mixed uniformly according to a certain proportion. The so-called active components generally refer to Y-type molecular sieves, type-selective molecular sieves and molecular sieves modified by other elements. Y-type molecula...

AI Technical Summary

Problems solved by technology

In addition, during the modification process, the activity of molecular sieves will decrease due to excessive local acidity or local overheating during calcination, and the agglomeration of molecular sieves will also cause uneven distribution of cations in molecular sieves during the exchange process, affecting the stability of product quality.

In addition, since the particle size of molecular sieves is basically less than 10 microns, there will be a certain amount of loss of molecular sieves in the traditional modification process, especially in the process of roasting and drying.