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Method for preparing molecular sieve catalyst used in carbon 4 liquid gas aromatization reaction

A liquefied gas, aromatization technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of carbon deposition, catalyst stability limitation, etc., and achieve the effect of high aromatization reaction performance

Inactive Publication Date: 2009-09-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The focus of hydrocarbon aromatization research is mainly on the ZSM-5 molecular sieve with strong acidity and better channel shape selectivity. However, due to its strong acidity and serious carbon deposition, the stability of the catalyst is limited. Therefore, how to improve the ZSM-5 molecular sieve The Stability of -5 Molecular Sieve Catalysts Becomes a Hot Issue in Aromatization Research

Method used

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  • Method for preparing molecular sieve catalyst used in carbon 4 liquid gas aromatization reaction
  • Method for preparing molecular sieve catalyst used in carbon 4 liquid gas aromatization reaction

Examples

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Embodiment 1

[0031] A certain amount of rare earth-70 wt% ZSM5 / 30 wt% ZSM11 co-crystallized molecular sieve (rare earth content accounts for 1.2 wt% of rare earth-70 wt% ZSM5 / 30 wt% ZSM11 co-crystallized molecular sieve), alumina and deionized water are mixed evenly Finally, extrusion molding, drying, 550 ° C roasting for 4 hours. 20g of the obtained roasted product was placed in 200ml, 0.2M NaOH solution, stirred in a constant temperature water bath at 75°C with air bubbling for 2h, cooled to room temperature, filtered, washed until neutral, and then washed with 0.8mol / L nitric acid at 80°C The ammonium solution was exchanged 3 times, washed 2 times, dried at 120°C, calcined at 540°C for 3 hours to obtain H-type molecular sieve, and then treated with water vapor at 550°C for 3 hours, and zinc metal was loaded by impregnation method, using ZnCl 2 The solution was soaked at room temperature for 12 hours, dried at 120°C, and calcined at 580°C for 3 hours. The resulting catalyst had a Zn load...

Embodiment 2

[0033] A certain amount of rare earth-50 wt% ZSM5 / 50 wt% ZSM11 co-crystallized molecular sieve (rare earth content accounts for 5.2 wt% of rare earth-50 wt% ZSM5 / 50 wt% ZSM11 co-crystallized molecular sieve), aluminum oxide and deionized water are mixed evenly Finally, extrude into strips, dry, and bake at 530°C for 8 hours. 20 g of the obtained roasted product was placed in 200 ml of 0.8 M KOH solution, and after alkali treatment temperature was 55 ° C, air bubbled and stirred for 9 h, then cooled to room temperature, filtered, washed until neutral, and used at 80 ° C with 0.8 mol / L The ammonium nitrate solution was exchanged 3 times, washed 2 times, dried at 120°C, calcined at 540°C for 3 hours to obtain H-type catalyst, and then treated with water vapor at 450°C for 8 hours, zinc metal was loaded by impregnation method, and Zn(NO 3 ) 2 The solution was soaked at room temperature for 12 hours, dried at 120°C, and calcined at 600°C for 2 hours. The resulting catalyst had a Z...

Embodiment 3

[0035] A certain amount of rare earth-10 wt% ZSM5 / 90 wt% ZSM11 co-crystallized molecular sieve (rare earth content accounts for 4.2 wt% of rare earth-10 wt% ZSM5 / 90 wt% ZSM11 co-crystallized molecular sieve), alumina and deionized water are mixed evenly Afterwards, extrusion molding, drying and calcination at 550°C for 4 hours. 20 g of the obtained calcined product was placed in 200 ml of 0.5 M NaOH solution, and after alkali treatment temperature was 65 ° C, air bubbled and stirred for 2 h, then cooled to room temperature, filtered, washed until neutral, and used at 80 ° C with 0.8 mol / L The ammonium nitrate solution was exchanged 3 times, washed 2 times with water, dried at 120°C, and calcined at 540°C for 3 hours to obtain an H-type catalyst, and then impregnated to support zinc metal, using Zn(NO 3 ) 2 solution, dried at 120°C, calcined at 580°C for 3 hours, and treated with water vapor at 600°C for 3 hours, the resulting catalyst had a Zn loading of 2 wt%, which was desi...

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Abstract

The invention relates to a method for preparing a molecular sieve catalyst used in carbon 4 liquid gas aromatization reaction. The concrete steps of the method are as follows: 1. the prepared rare earth-ZSM5 / ZSM11 co-crystallization molecular sieve, alumina and water are mixed uniformly, extruded and molded, dried and baked; 2. the above product is put in alkali solution with the concentration of 0.05 to 2.0M and air-bubble-stirred for 1 to 10 hours at 45 to 100 DEG C; 3. the product in step 2 is washed to neutrality, exchanged by ammonium nitrate solution, dried and baked into H-type molecular sieve; and 4. the product in step 3 is processed by high-temperature water vapor and loaded with metal zinc, thus obtaining the catalyst. The method has the advantages that the modified molecular sieve catalyst shows better carbon 4 liquid gas aromatization reaction performance compared with catalyst that is not alkali-treated.

Description

technical field [0001] The invention relates to a molecular sieve catalyst for improving the performance of the aromatization reaction of C4 liquefied gas and a preparation method thereof. Specifically, it is a method of improving the aromatization reaction performance of C4 liquefied gas by alkali treatment-steam treatment-loaded metal. Background technique [0002] Aromatics are an important basic raw material of petrochemical industry. Among the total of about 8 million known organic compounds, aromatic compounds account for about 30%. Among them, BTX aromatics (benzene, toluene, xylene) are called primary basic organic raw materials. BTX aromatics mainly come from catalytic reforming, pyrolysis ethylene by-products, coal processing by-products, aromatization of light hydrocarbons, conversion between aromatics, etc. , first printed in Beijing in August 2001]. [0003] In order to obtain new sources of aromatics, the research on the aromatization of light hydrocarbons at...

Claims

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Application Information

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IPC IPC(8): B01J29/80C07C2/00C07C5/00C10G50/00
Inventor 刘盛林安杰徐龙伢辛文杰谢素娟王玉忠
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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