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Preparation method of porous nanometer silicon dioxide/MCM (Multi Chip Module)-22 molecular sieve catalyst

A nano-silica, molecular sieve technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as low para-selectivity, improve comprehensive performance, low price, and reduce isomerization. effect of chemical reaction

Active Publication Date: 2015-02-25
SUZHOU ZHIRUI PHOTOELECTRIC MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low para-selectivity in the synthesis of p-xylene by alkylation of toluene methanol on MCM-22 molecular sieve in the background technology, a preparation method of porous nano-silica / MCM-22 molecular sieve catalyst is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Add 1.5 grams of MCM-22 molecular sieves to 10.0 grams of ethanol, disperse 6.0 grams of purified nano-attapulgite in 20.0 grams of acetone, and slowly add the nano-attapulgite dispersion at a temperature of 25°C Into the dispersion of MCM-22 molecular sieve, continue to stir after completion, keep warm for 2 hours, filter, wash, and dry to obtain attapulgite / MCM-22 molecular sieve;

[0021] 2. Take 5.0 grams of the attapulgite / MCM-22 molecular sieve prepared in step 1 and place it in a closed container, add 3.0 grams of iodine element, keep it warm at 120°C for 2 hours, and cool to room temperature to obtain Porous nano silica / MCM-22 molecular sieve catalyst.

Embodiment 2

[0023] 1. Add 3.0 grams of MCM-22 molecular sieves to 10.0 grams of ethanol, disperse 3.0 grams of purified nano-attapulgite in 30.0 grams of tetrahydrofuran, and slowly add the nano-attapulgite dispersion at a temperature of 0°C Into the dispersion of MCM-22 molecular sieve, continue to stir after completion, keep warm for 2 hours, filter, wash, and dry to obtain attapulgite / MCM-22 molecular sieve;

[0024] 2. Take 5.0 grams of the attapulgite / MCM-22 molecular sieve prepared in step 1 and place it in a closed container, add 1.0 grams of iodine element, keep the temperature at 110°C for 6 hours, and cool to room temperature to obtain Porous, like silica / MCM-22 molecular sieve catalyst.

Embodiment 3

[0026] 1. Add 2.0 grams of MCM-22 molecular sieves to 10.0 grams of ethanol, disperse 4.0 grams of purified nano-attapulgite in 20 grams of ethanol, and slowly add the nano-attapulgite dispersion at a temperature of 5°C into the dispersion of MCM-22 molecular sieves, continue to stir after completion, keep warm for 4 hours, filter, wash, and dry to obtain attapulgite / MCM-22 molecular sieves;

[0027] 2. Take 5.0 grams of the attapulgite / MCM-22 molecular sieve prepared in step 1 and place it in a closed container, add 2.0 grams of iodine element, keep the temperature at 100°C for 4 hours, and cool to room temperature to obtain Porous nano silica / MCM-22 molecular sieve catalyst.

[0028] Performance evaluation of porous nano-silica / MCM-22 molecular sieve catalyst

[0029] The porous nano-silica / MCM-22 molecular sieve catalyst is evaluated through the experiment of alkylating toluene and methanol to synthesize p-xylene. The reaction conditions are: the molar ratio of toluene to ...

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Abstract

The invention relates to a preparation method of a porous nanometer silicon dioxide / MCM (Multi Chip Module)-22 molecular sieve catalyst, which belongs to the technical field of shape selective catalysis. The preparation method comprises the following steps of: firstly, dispersing MCM-22 molecular sieves in alcohol, adding purified nanometer attapulgite to a hydrophilic organic solvent; and then, slowly adding the purified nanometer attapulgite to alcohol dispersion liquid of the MCM-22 molecular sieves to prepare attapulgite / MCM-22 molecular sieves; and finally, placing the prepared attapulgite / MCM-22 molecular sieves in iodine vapor to prepare the porous nanometer silica / MCM-22 molecular sieve catalyst. According to the preparation method of the porous nanometer silicon dioxide / MCM-22 molecular sieve catalyst disclosed by the invention, the attapulgite / MCM-22 molecular sieves are placed in the iodine vapor for achieving a doping effect, so that the attapulgite can be converted into porous nanometer silica, the number of acid active sites on the outer surfaces of the MCM-22 molecular sieves is reduced, isomerization reaction of the paraxylene on the outer surfaces of the molecular sieves is effectively lowered, and the selectivity of the paraxylene is further improved.

Description

technical field [0001] The invention relates to a method for preparing a porous nano-silica / MCM-22 molecular sieve catalyst, belonging to the technical field of shape-selective catalysis. Background technique [0002] P-xylene is an important raw material for the synthesis of polyester fibers, pesticides, medicines and dyes. At present, the industry mainly uses mixed xylene isomerization, toluene and C 9 Aromatics disproportionation and selective disproportionation of toluene to produce p-xylene. The p-xylene obtained by the first two methods is only the thermodynamic equilibrium concentration among the three isomers of xylene, which is about 24%. The subsequent separation of p-xylene is quite harsh and consumes a lot of energy; In the process, two moles of toluene are needed to generate one mole of p-xylene, and the utilization rate of toluene is low. [0003] Alkylation of toluene and methanol to directly synthesize high-concentration p-xylene has been a research hotspo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70C07C2/88C07C15/08
CPCY02P20/52
Inventor 张宇左士祥吕列超
Owner SUZHOU ZHIRUI PHOTOELECTRIC MATERIAL TECH CO LTD
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