Modification treatment method of Y-type zeolite

Abstract

The invention relates to a modification treatment method of a Y-type zeolite. The method comprises the following steps: carrying out ammonium exchange and direct burning on industrially-produced common NaY zeolite, repeating the ammonium exchange and direct burning for at least three times, then subjecting the NaY zeolite to a water steam treatment at a high temperature, and finally processing the NaY zeolite by a critic acid solution. The silicon / aluminum ratio of processed Y-type zeolite is in a range of 9 to 11, and the specific surface area of the processed Y-type zeolite is in a range of 550 to 650 m2 / g. Furthermore, the zeolite stability is improved, the sodium content is decreased, at the same time the amorphous aluminum out of the skeleton is removed, secondary mesopores (3-20 nm) are generated in the Y-type zeolite, strong acid centers are generated at the meantime, no environmental pollutant is generated during the treatment process, the efficiency is high, the modification treatment method is environment-friendly, the whole process is carried out on the basis of conventional modification treatments, and the provided method is suitable for massive preparation of Y-type zeolite with a high silicon / aluminum ratio through modification on NaY zeolite.

Description

technical field

[0001] The invention relates to a modification treatment method of zeolite molecular sieve material, in particular to the modification treatment of industrially produced conventional NaY type zeolite. Background technique

[0002] Because of its unique pore structure, Y-type zeolite is widely used in the fields of adsorption, separation, and catalysis, especially in petrochemical industry, and is the main active component of fluid catalytic cracking (FCC) catalysts. The silicon-aluminum ratio of the Y-type zeolite unit cell framework directly affects the hydrothermal stability and acidity of the zeolite molecular sieve. However, with the heavy and inferior quality of petroleum, conventional zeolites can no longer meet the harsh reaction-regeneration conditions of catalytic cracking; increase the silicon-aluminum ratio of the Y-type zeolite framework, reasonably reduce the acid center density, and increase the relative strength of the acid center , and increa...