Kaolinite-clay-containing in situ crystallizing ZSM-5 and Y type molecular sieve immobilized bed catalyst and preparation thereof

Abstract

The present invention provides a fixed bed catalyst containing kaolin home position crystallization and Y type molecular sieve and its preparing method, the preparing step is firstly baking kaolin under the temperature 1000-1400 Celsius, then mixing with inoculating seed molecular sieve, adhesive, structure addition agent and water, then extruding, further processing quadratic baking under the temperature 600-900 Celsius after forming, then hydrothermal crystallizing according to the NaY molecular sieve or ZSM-5 molecular sieve synthesis condition, the catalyst product is obtained by modifying treating crystallization product. The catalyst prepared by the invention has ZSM-5 and Y molecular sieves at the same time, the molecular sieve has a high content, high activity and stability.

Description

technical field

[0001] The invention relates to a fixed-bed catalyst and a preparation method thereof. Specifically, the invention provides a method for synthesizing a fixed-bed catalyst containing ZSM-5 molecular sieve and Y-type molecular sieve through in-situ crystallization with kaolin as the main raw material. Background technique

[0002] Fixed-bed catalysts containing molecular sieves are generally synthesized and modified first, and then the molecular sieves are combined with a carrier with or without a binder, and then shaped to obtain a finished catalyst. Catalysts containing Y-type molecular sieves or ZSM-5 molecular sieves are no exception. The catalyst prepared by this method cannot give full play to its catalytic performance, mainly because the active component molecular sieve and its carrier are mechanically mixed, the molecular sieve exists in various parts of the catalyst bulk phase, rather than highly dispersed on the catalyst surface, and the utilization r...