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Method for improving acidity of MCM-22 molecular sieve based catalyst

A technology of MCM-22 and molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low acid density, weak acid strength, limitations, etc., and achieve increased acid density and high catalytic activity Effect

Inactive Publication Date: 2013-03-13
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, compared with Beta, Y molecular sieves, MCM-22 molecular sieves have lower acid density and weaker acid strength, and the application of this molecular sieve is limited in reactions requiring stronger acid catalysis

Method used

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  • Method for improving acidity of MCM-22 molecular sieve based catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Get 20g roasting and remove the Na-type MCM-22 molecular sieve of template agent, be 0.05 mol / liter Al(NO 3 ) 3 The solution was treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product was exchanged in 400 ml of ammonium nitrate solution with a concentration of 0.8 mol / liter at 80 degrees Celsius for 2 hours, twice in a row, filtered and washed After drying, it is calcined at 540°C to obtain hydrogen-type molecular sieves. The molecular sieves were pressed into tablets and crushed into 20-40 mesh particles, which were designated as Cat-B. The change of propylene and butene conversion with time on the obtained catalyst sample is shown in figure 1 with figure 2 .

Embodiment 2

[0021] Get 20g roasting and remove the Na-type MCM-22 molecular sieve of template agent, be 0.1 mol / liter Al(NO 3 ) 3 The solution was treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product was exchanged in 400 ml of ammonium nitrate solution with a concentration of 0.8 mol / liter at 80 degrees Celsius for 2 hours, twice in a row, filtered and washed After drying, it is calcined at 540°C to obtain hydrogen-type molecular sieves. The molecular sieves were pressed into tablets and crushed into 20-40 mesh particles, which were designated as Cat-C. The change of propylene and butene conversion with time on the obtained catalyst sample is shown in figure 1 with figure 2 .

Embodiment 3

[0023] Get 20g roasting and remove the Na-type MCM-22 molecular sieve of template agent, be 0.2 mol / liter Al(NO 3 ) 3 The solution was treated in a stainless steel reactor at 175 degrees Celsius for 72 hours, filtered, washed and dried; the product was exchanged in 400 ml of ammonium nitrate solution with a concentration of 0.8 mol / liter at 80 degrees Celsius for 2 hours, twice in a row, filtered and washed After drying, it is calcined at 540°C to obtain hydrogen-type molecular sieves. The molecular sieve is pressed into tablets and crushed into 20-40 mesh particles, which are designated as Cat-D. The change of propylene and butene conversion with time on the obtained catalyst sample is shown in figure 1 with figure 2 .

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Abstract

The invention provides a method for improving acidity of an MCM-22 molecular sieve based catalyst. The method comprises the following specific steps of: processing a roasted Na-type MCM-22 molecular sieve for 5-180 hours at a temperature of 50 to 250 DEG C by 0.01-1.0 mol / L Al(NO3)3 solution; and washing and drying the obtained products and exchanging the obtained products with ammonium nitrate solution; and filtering the obtained products, washing the obtained products by deionized water, drying the obtained products, and then roasting the obtained products to obtain the H-type catalyst. According to the method, in the process of preparing the catalyst by modifying the MCM-22 molecular sieve by the Al(NO3)3 solution, the acid density and the acid strength of the molecular sieve can be effectively improved; and compared with those of the unprocessed MCM-22 molecular sieve based catalyst, the activity and the stability for catalyzing transformation of propylene and butane of the catalyst provided by the invention are obviously improved in the process of catalyzing alkylation reaction of benzene and liquefied gas.

Description

technical field [0001] The invention belongs to the field of molecular sieve catalysts, in particular to a method for improving the acidity of MCM-22 molecular sieve catalysts. Background technique [0002] MCM-22 molecular sieve (US 4954325) is a widely used catalyst material, exhibiting excellent catalytic cracking (US 4983276), catalyzing the alkylation of benzene (US 4992615; US 5334795; Studies in Surface Science and Catalysis, 1999, 121:53) and other catalytic properties. However, compared with Beta, Y molecular sieves, MCM-22 molecular sieves have lower acid density and weaker acid strength, and the application of this molecular sieve is limited in reactions requiring stronger acid catalysis. Through research, researchers have discovered some modification methods that can improve the acidity of molecular sieves, such as loading cations, optimizing the deamination process, and modifying with aluminum supplementation. [0003] Shen Zhihong et al. (Journal of Fuel Chem...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C2/66C07C15/02
Inventor 徐龙伢辛文杰刘克峰魏会娟谢素娟刘盛林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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