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Porous molecular-sieve catalyst for assembling carbide and its preparation

A mesoporous molecular sieve and catalyst technology, applied in the field of catalysis, can solve problems such as easy aggregation of carbide active component particles, inconvenient use, and decreased catalytic activity, achieving low cost, simple method, and good low-temperature catalytic activity Effect

Inactive Publication Date: 2007-01-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of carbide catalysts is that the particles of carbide active components are easy to agglomerate during the reaction process, so that the catalytic activity decreases rapidly.
At the same time, carbide is very sensitive to humid air, which is inconvenient to use

Method used

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  • Porous molecular-sieve catalyst for assembling carbide and its preparation
  • Porous molecular-sieve catalyst for assembling carbide and its preparation
  • Porous molecular-sieve catalyst for assembling carbide and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 0.43g EO 20 PO 70 EO 20 (Molecular weight is 5800) Dissolve the template agent in 167ml deionized water, add 41.67g hydrochloric acid (4M) in a water bath at 50°C under stirring conditions, continue stirring for 3 hours, then add 41.67g tetraethyl orthosilicate (containing 0.2 moles of Si) , continue to stir for 24 hours, then transfer to a Teflon-lined autoclave, crystallize at 100°C for 24 hours, filter, wash, and suction filter, dry the obtained solid naturally at room temperature, and put it into a heating furnace In the process, the temperature was raised to 600°C at a heating rate of 2°C / min, and the temperature was kept constant for 6 hours to obtain the prepared SBA-15 mesoporous molecular sieve. Weigh ammonium paratungstate (5(NH 4 ) 2 O·12WO 3 ·5H 2 O) 1.30g (containing 0.005 moles of tungsten) was dissolved in 30ml of deionized water, then, this solution was impregnated in 9.01g (containing 0.15 moles of Si) SBA-15 mesoporous molecular sieve for...

Embodiment 2

[0031] (1) 1.35gEO 20 PO 70 EO 20 (Molecular weight is 5800) template agent is dissolved in 312ml deionized water, add 125.0g hydrochloric acid (4M) under 40 ℃ water bath, stirring condition, continue stirring for 5 hours, then add 20.83g orthosilicate ethyl ester (containing 0.1 mole of Si) , continue to stir for 30 hours, then transfer to a Teflon-lined autoclave, crystallize at 85°C for 32 hours, filter, wash, and suction filter, dry the solid naturally at room temperature, and put it in a heating furnace. Raise the temperature to 500°C at a heating rate of 2°C / min and keep the temperature constant for 7 hours to obtain the prepared SBA-15 mesoporous molecular sieve. Weigh ammonium paratungstate (5(NH 4 ) 2 O·12WO 3 ·5H 2 O) 2.61g (containing 0.01 mole of tungsten) was dissolved in 15ml of deionized water, then, this solution was immersed in 3.00g (containing 0.05 mole of Si) in SBA-15 mesoporous molecular sieve for 24 hours, after natural drying, and then put into th...

Embodiment 3

[0035] (1) Add 0.43g EO 20 PO 70 EO 20 (Molecular weight is 5800) Dissolve the template agent in 167ml deionized water, add 41.67g hydrochloric acid (4M) in a water bath at 50°C under stirring conditions, continue stirring for 3 hours, then add 41.67g tetraethyl orthosilicate (containing 0.2 moles of Si) , continue to stir for 24 hours, then transfer to a Teflon-lined autoclave, crystallize at 100°C for 24 hours, filter, wash, and suction filter, dry the obtained solid at room temperature and put it in a heating furnace , the temperature was raised to 600°C at a heating rate of 2°C / min, and the temperature was kept constant for 6 hours to obtain the prepared SBA-15 mesoporous molecular sieve. Weigh ammonium molybdate ((NH 4 ) 6 ·Mo 7 o 24 4H 2 O) 0.88g (containing 0.005 moles of molybdenum) was dissolved in 30ml of deionized water, then, this solution was impregnated in 9.01g (containing 0.15 moles of Si) SBA-15 mesoporous molecular sieve for 36 hours, after natural dry...

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Abstract

A meso-porous molecular sieve catalyst with carbide features that the carbide particles are assembled in the pores of meso-porous molecular sieve, resulting in high isolation and dispersion of active component particles and in turn high stability and activity.

Description

Technical field: [0001] The invention relates to a mesoporous molecular sieve catalyst assembled with carbides and a preparation method thereof. It belongs to the field of catalytic technology. Background technique: [0002] Transition metal carbides (especially tungsten carbide, molybdenum carbide, etc.) are a class of catalyst materials with catalytic properties similar to those of noble metals. Excellent catalytic performance has attracted great attention in recent years (Metal carbides and nitrides as potential catalysts for hydroprocessing, Applied Catalysis A: General, 2003, Vol.240(1-2):pp.1-28). Recently, our study showed that Mo 2 C and Mo 2 C / Al 2 o 3 Catalysts have the same properties as Pd / Al for the catalytic decomposition of NO 2 o 3 Catalysts with similar activity (Shengfu Ji, et al.Mo 2 C and Mo 2 C / Al 2 o 3 catalysts for NO direct decomposition, Catalysis Communications, 2005, Vol.6(6):pp.389-393); transition metal ion modified Mo 2 C / Al 2 o 3...

Claims

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Application Information

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IPC IPC(8): B01J29/00B01J27/22
Inventor 季生福吴平易胡林华李成岳
Owner BEIJING UNIV OF CHEM TECH
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