Carrier material containing molecular sieve and amorphous silica-alumina and preparation method thereof

Abstract

The invention discloses a carrier material containing a molecular sieve and amorphous silica-alumina and a preparation method thereof. The preparation method is characterized in that in NaY molecular sieve modification, before final hydrothermal treatment, amorphous silica-alumina slurry and a surfactant are introduced so that the molecular sieve and the amorphous silica-alumina are dispersed uniformly and molecular sieve agglomeration or channel blocking is avoided, and thus a specific surface area and a pore volume of the carrier material are improved and catalyst performances are improved. The carrier material is especially suitable for being used as a carrier component of a hydrocracking catalyst.

Description

technical field [0001] The present invention relates to a composite carrier material and its preparation method, in particular to a carrier material containing molecular sieve and amorphous silica-alumina and its preparation method, especially for hydrocracking catalyst containing Y-type molecular sieve-amorphous A silica-alumina catalyst carrier material and a preparation method thereof. Background technique [0002] In general, a hydrocracking catalyst is a catalyst that has both cracking and hydrogenation-dehydrogenation functions. The cracking function is provided by an acidic carrier, while the hydrodehydrogenation function is provided by an active metal. Most of the acidic carrier is alumina or amorphous silica-alumina as the carrier, together with a certain amount of molecular sieve. The basic preparation process is to first Alumina or silicon-containing alumina is directly mixed with molecular sieve and other additives, then shaped, dried and fired, and finally impr...

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that part of the amorphous silicon-alumina is easy to enter the pores of the molecular sieve, which not only blocks the pores of the molecular sieve, reduces the pore volume and specific surface area of ​​the molecular sieve, but also covers part of the acid center, which affects the catalytic performance of the molecular sieve. It also affects the modification process of molecular sieves, so that the catalytic performance of molecular sieves and amorphous silicon aluminum cannot be fully exerted

In this method, molecular sieves will agglomerate in the silica-alumina carrier, or molecular sieves and amorphous silica-alumina will enter into each other's channels, blocking some channels and covering a part of the acid center, so that the specific surface area, pore volume and acidity of the carrier will increase to a limited extent.