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Vanadium-containing MCM-41 heteroatom molecular sieve catalyst as well as preparation method and application thereof

A technology of MCM-41 and heteroatom molecular sieves, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as not being able to meet market demand, and achieve good economic benefits, high activity, and easy operation Effect

Inactive Publication Date: 2014-08-27
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increasing demand for propylene, propylene as a by-product from catalytic cracking, steam cracking and coking production units can no longer meet market demand

Method used

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  • Vanadium-containing MCM-41 heteroatom molecular sieve catalyst as well as preparation method and application thereof
  • Vanadium-containing MCM-41 heteroatom molecular sieve catalyst as well as preparation method and application thereof
  • Vanadium-containing MCM-41 heteroatom molecular sieve catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.4g of NaOH in 200mL of deionized water at 60°C, add 2.5g of cetyltrimethylammonium bromide (CTAB), stir for 1 hour, then add 0.6g of ammonium metavanadate (NH 4 VO 3 ), after it dissolved, 12.4 mL of tetraethyl orthosilicate (TEOS) was slowly added dropwise, then vigorously stirred for 6 hours, and then aged at room temperature for 24 hours. The resulting liquid was poured into a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallized in a blast drying oven at 120°C for 48 hours, and then cooled at room temperature. Then the obtained liquid was divided into 10mL centrifuge tubes, washed by centrifugation at 3600r / min, and then dried in a blast drying oven at 60°C. The dried catalyst powder was placed in a muffle furnace and calcined at 550° C. for 4 hours, and then sieved into catalysts of required mesh.

Embodiment 2

[0025] Get 0.2g of the catalyst in Example 1, carry out the propane oxidative dehydrogenation reaction in a catalytic dehydrogenation test device, the reaction temperature is 600°C, the reaction pressure is normal pressure, and the propane space velocity is 6h -1 , the mass flow ratio of reaction gas propane and carbon dioxide is 1:1. The catalyst is used in the reaction of carbon dioxide oxidation and dehydrogenation of propane, the conversion rate of propane is 33.2%, the selectivity of propylene is 89%, and the yield of carbon monoxide is 8.3%.

Embodiment 3

[0027] Dissolve 0.4g of NaOH in 150mL of deionized water at 60°C, add 2.5g of cetyltrimethylammonium bromide (CTAB), stir for 1 hour, then add 0.6g of ammonium metavanadate (NH 4 VO 3 ), after it dissolved, 12.4 mL of tetraethyl orthosilicate (TEOS) was slowly added dropwise, then vigorously stirred for 6 hours, and then aged at room temperature for 24 hours. The resulting liquid was poured into a polytetrafluoroethylene-lined stainless steel crystallization kettle, crystallized in a blast oven at 120°C for 72 hours, and then cooled at room temperature. Then the obtained liquid was divided into 10mL centrifuge tubes, centrifuged and washed at a speed of 3600r / min, and then dried in a blast drying oven at 100°C. The dried catalyst powder was placed in a muffle furnace and calcined at 550° C. for 4 hours, and then sieved into catalysts of required mesh. figure 1 The XRD pattern in the middle shows that the synthesized sample has the characteristic diffraction peaks of (100), (...

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Abstract

The invention discloses a vanadium-containing MCM-41 heteroatom molecular sieve catalyst as well as a preparation method and an application in preparation of propylene and coproduction of carbon monoxide through oxidative dehydrogenation of propane. A heteroatom molecular sieve is synthesized from a vanadium source, a silicon source, alkali, a template agent and deionized water by using a hydro-thermal method. The method of preparation of propylene and coproduction of carbon monoxide by using carbon dioxide to oxidize propane so as to dehydrogenate has obvious advantages that the preparation method of the catalyst is simple and low in cost, the prepared catalyst has the advantages of high activity, good stability, high propene yield and good regeneration performance, meanwhile greenhouse gas carbon dioxide is consumed and carbon monoxide is coproduced, so that the preparation method has relatively good economic benefit.

Description

technical field [0001] The present invention relates to the present invention relates to a vanadium-containing MCM-41 heteroatom molecular sieve catalyst used in the reaction of carbon dioxide oxidation of propane dehydrogenation to propylene and co-production of carbon monoxide. Background technique [0002] Propylene is an important petrochemical raw material, mainly used in the production of polypropylene, acrylonitrile, acrylic acid, butanol, octanol, propylene oxide and other chemical products. Due to the rich variety of propylene downstream products and the domestic allocation capacity is equivalent to the propylene production capacity, the import volume of propylene monomer has increased year by year in recent years. In 2011, the import volume of propylene monomer was 1.76 million tons; in 2012, the import volume was 2.15 million tons, an increase of 22%. Due to the increasing demand for propylene, propylene as a by-product from catalytic cracking, steam cracking and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/08C01B31/18B01J29/04C07C5/333C07C11/06C01B32/40
CPCY02P20/52
Inventor 郎万中蔡玉郭亚军刘学胡昌龙
Owner SHANGHAI NORMAL UNIVERSITY
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