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Double-pore-channel crystallization aluminosilicate molecular sieve catalyst and preparing method thereof

A technique of aluminosilicate and molecular sieve, which is applied in the direction of molecular sieve catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems of less research, achieve the improvement of propylene ethylene ratio, propylene selectivity and propylene ethylene ratio, and improve acid Effect of Center Strength and Density

Active Publication Date: 2016-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few studies on the application of molecular sieves with other framework structures in MTP reactions.

Method used

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  • Double-pore-channel crystallization aluminosilicate molecular sieve catalyst and preparing method thereof
  • Double-pore-channel crystallization aluminosilicate molecular sieve catalyst and preparing method thereof
  • Double-pore-channel crystallization aluminosilicate molecular sieve catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Catalyst preparation

[0044] Preparation of dual-channel aluminosilicate molecular sieve carrier:

[0045] 2.72g templating agent hexamethylene-1,6-bis(trimethylammonium bromide)[(CH 3 ) 3 N + -(CH 2 ) 6 -N + (CH 3 ) 3 ]Br 2 was dissolved in 10 g of deionized water, and 40 g of silica sol (SiO 2 Mass content 30%), stir rapidly until the mixture is uniform. In addition, 1.92 g of sodium chloride was dissolved in 10 g of deionized water, and sodium hydroxide was added to adjust the pH to 11-12, and then 0.82 g of sodium metaaluminate was added under stirring. Add the aluminum salt solution to the above-mentioned silica sol containing the template agent, and the molar ratio of the template agent, silicon oxide, aluminum oxide, sodium oxide and deionized water in the obtained uniform white gel is 1.5:40:1.0:6.2 :500. Transfer the gel into a synthesis kettle, hydrothermally crystallize at 180°C for 48 hours, and then centrifuge, wash, dry, and roast the solid pr...

Embodiment 2

[0054] Catalyst preparation

[0055] Preparation of dual-channel aluminosilicate molecular sieve carrier:

[0056] 5.02g templating agent decamethylene-1,6-bis(trimethylammonium bromide)[(CH 3 ) 3 N + -(CH 2 ) 10 -N + (CH 3 ) 3 ]Br 2 was dissolved in 10 g of deionized water, and 15 g of silica sol (SiO 2 Mass content 30%), stir rapidly until the mixture is uniform. In addition, 1.91 g of sodium bromide was dissolved in 10 g of deionized water, and sodium hydroxide was added to adjust the pH to 10-11, and then 0.25 g of sodium metaaluminate was added under stirring. Add the aluminum salt solution to the above-mentioned silica sol containing the template agent, and the molar ratio of the template agent, silicon oxide, aluminum oxide, sodium oxide and deionized water in the resulting uniform white gel is 4.0:50:1.0:6.2 : 3000, the gel is transferred to a synthesis kettle, hydrothermally crystallized at 200°C for 24 hours, and the solid product is then centrifugally was...

Embodiment 3

[0087] Response evaluation

[0088] Catalyst performance evaluation was carried out using a micro-fixed-bed reactor. The HDM1, Mg / HDM1, HDM2 and Mg / HDM2 prepared in Examples 1 and 2 were respectively pressed into tablets, crushed and sieved into 40-60 mesh samples, and 2 g of samples were taken respectively and put into stainless steel reactors. Activated for 1 hour, purged under nitrogen atmosphere for 0.5 hours and lowered to the predetermined reaction temperature of 480°C. Switch to the methanol feed pump to pump methanol into the reactor, and the methanol feed weight space velocity is 2h -1 , The reaction product was analyzed online by gas chromatography, and the reaction results were shown in Table 1 when the feed was fed for 60 minutes.

[0089] On the crystalline aluminosilicate molecular sieve catalyst with ten-membered ring and twelve-membered ring double-channel channel prepared by the present invention, the reaction activity is high, the conversion rate of methano...

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Abstract

The invention provides a double-pore-channel crystallization aluminosilicate molecular sieve catalyst and a preparing method thereof.The preparing method of the catalyst includes the following steps that a double-pore-channel crystallization aluminosilicate molecular sieve carrier with the ten-membered ring ordinal micropore characteristic and the twelve-membered ring ordinal micropore characteristic is adopted, wherein a twelve-membered ring has the non-through pore channel characteristic; the molecular sieve carrier is subjected to ion exchange through a weakly acidic solution, then the product is loaded and modified through metal elements or non-metallic elements to be dried and roasted, and the propylene methyl-alcohol or / and dimethyl-ether conversion preparing catalyst can be obtained.The catalyst is used for a propylene methyl-alcohol or / and dimethyl-ether conversion preparing reaction, the mass selectivity of propylene in non-aqueous products can be 50wt% or above, and the mass ratio of propylene to ethylene is larger than 15.

Description

technical field [0001] The invention relates to the field of catalysis for preparing propylene from methanol or / and dimethyl ether, in particular to a dual-channel crystalline aluminosilicate molecular sieve catalyst and a preparation method thereof. Background technique [0002] Propylene is an important basic organic chemical raw material, mainly derived from processes such as catalytic cracking, naphtha steam cracking and propane dehydrogenation, accounting for more than 95% of the production capacity of propylene. With the rapid growth of demand for propylene derivatives such as polypropylene, acrylonitrile, and propylene oxide, the gap between the supply and demand of propylene is increasing year by year. Therefore, new ways to produce propylene have always been a research hotspot at home and abroad. In view of my country's energy structure characteristics of "rich coal, less oil and less gas", the methanol-to-propylene (MTP) technology for the production of propylene b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J32/00C07C11/06C07C1/20
Inventor 王莹利许磊卢鹏徐力陈磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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