Preparation method of carbon nitride/microporous molecular sieve composite material

A technology of microporous molecular sieves and composite materials, which is applied in the field of preparation of solid inorganic composite materials, can solve the problems of high cost, low shape-selective performance, cumbersome preparation of shape-selective catalysts, etc., and achieve improved mass ratio and high shape-selective performance , The effect of improving the shape selection performance

Inactive Publication Date: 2013-11-06
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a simple synthesis method, low cost, and high shape-selective performance for the preparation of a shape-selective catalyst in the process of synthesizing p-xylene by disproportionation of toluene, which is cumbersome, high in cost, and low in shape-selective performance. Preparation method of shape-selective catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix 0.4 g of melamine and 1.0 g of microporous molecular sieve MCM-22, grind them thoroughly until they are evenly mixed; then put the well-mixed mixture of melamine and microporous molecular sieves into a tube furnace, and pass nitrogen gas at a flow rate of 20 mL / min at room temperature After purging for 30 min, the nitrogen flow rate was adjusted to 1 mL / min, the temperature was raised to 550 °C at a rate of 1 °C / min, and then lowered to room temperature to obtain the carbon nitride / microporous molecular sieve composite material CN / MCM-22 (1).

Embodiment 2

[0014] Mix 0.4 g of melamine and 1.0 g of microporous molecular sieve MCM-22, grind them thoroughly until they are evenly mixed; then put the well-mixed mixture of melamine and microporous molecular sieves into a tube furnace, and pass nitrogen gas at a flow rate of 20 mL / min at room temperature After purging for 30 min, the nitrogen flow rate was adjusted to 1 mL / min, the temperature was raised to 550 °C at a rate of 5 °C / min, and then lowered to room temperature to obtain the carbon nitride / microporous molecular sieve composite material CN / MCM-22 (2).

Embodiment 3

[0016] Mix 0.4 g of melamine and 1.0 g of microporous molecular sieve MCM-22, grind them thoroughly until they are evenly mixed; then put the well-mixed mixture of melamine and microporous molecular sieves into a tube furnace, and pass nitrogen gas at a flow rate of 20 mL / min at room temperature After purging for 30 min, the nitrogen flow rate was adjusted to 1 mL / min, the temperature was raised to 550 °C at a rate of 10 °C / min, and then lowered to room temperature to obtain the carbon nitride / microporous molecular sieve composite material CN / MCM-22 (3).

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Abstract

The invention relates to a preparation method of a carbon nitride / microporous molecular sieve composite material. The method takes the microporous molecular sieve ZSM-5 or MCM-22 as a matrix, and adopts melamine as a precursor. The carbon nitride (C3N4) is loaded to the external surface of the microporous molecular sieve by means of mechanical grinding method and temperature programmed calcinations. The melamine and the microporous molecular sieve are in a mass ratio of 0.1:1-1:1. The composite material obtained by the invention has very good shape selective catalysis on a toluene disproportionation process. Also, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of preparation of solid inorganic composite materials, in particular to a preparation method of carbon nitride / microporous molecular sieve composite materials used in the process of synthesizing p-xylene by disproportionation of toluene. Background technique [0002] The process of toluene disproportionation to p-xylene is a typical shape-selective catalytic process. Microporous molecular sieves such as ZSM-5 and MCM-22 are commonly used catalysts in the field of shape-selective catalysis. However, due to the existence of a large number of acid sites on the outer surface of these microporous molecular sieves, the para-products generated in the pores of the microporous molecular sieves are easily isomerized on the acidic sites on the outer surface of the molecular sieve, thereby reducing the Product selectivity. In order to obtain p-xylene with high selectivity, the microporous molecular sieve must be modified to red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C07C15/08C07C15/04C07C6/12
CPCY02P20/52
Inventor 薛冰苏进孙海南李永昕柳娜许杰
Owner CHANGZHOU UNIV
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