Porous molecular sieve catalyst for assembling tungsten carbide and its preparation

A mesoporous molecular sieve and tungsten carbide technology, which is applied in the field of catalysis, can solve the problems of inconvenient use, easy aggregation of tungsten carbide active component particles, and decreased catalytic activity, achieving low cost, good structural order, and The effect of simple method

Inactive Publication Date: 2008-01-23
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 tungsten carbide catalysts is that the particles of tungsten carbide active components are easy to agglomerate during the reaction, so that the catalytic activity decreases rapidly.
At the same time, tungsten carbide is very sensitive to humid air, which is inconvenient to use

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 0.35g EC 20 PO 70 EO 20 The template agent (molecular weight is 5800) was dissolved in 95ml deionized water, and 31.25g hydrochloric acid (4M) was added in a 50°C water bath with stirring, and the stirring was continued for 3 hours; the 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 added to the above solution, continued to stir for 3 hours, then added 31.25g of tetraethyl orthosilicate (containing 0.15 moles of Si), and continued to stir for 22 hours, Then, transfer to a Teflon-lined autoclave, and crystallize at 100°C for 24 hours. The product is filtered, washed, and suction-filtered. The obtained solid is naturally dried at room temperature for 24 hours, and then placed in a heating furnace. , the temperature was raised to 550°C at a heating rate of 2°C / min, and the temperature was kept constant for 7 hours, which was the solid product of tungsten carbide pre...

Embodiment 2

[0028] (1) Add 0.67g EO 20 PO 70 EO 20(Molecular weight is 5800) template agent is dissolved in 106ml deionized water, in 40 ℃ water bath, add 62.5g hydrochloric acid (4M) under stirring condition, continue stirring for 5 hours; Weigh ammonium paratungstate (5(NH 4 ) 2 O·12WO 3 ·5H 2 O) 2.61g (containing 0.01 mol of tungsten) was dissolved in 50ml of deionized water, then added to the above solution, continued to stir for 8 hours, then added 10.42g of tetraethyl orthosilicate (containing 0.05 mol of Si), and continued to stir for 30 hours, Then, it was transferred to a Teflon-lined autoclave, crystallized at 85°C for 32 hours, filtered, washed, and suction-filtered, and the obtained solid was naturally dried at room temperature, then placed in a heating furnace at 2°C / Raise the temperature to 600°C at a heating rate of min, and keep the temperature constant for 6 hours, which is the solid product of tungsten carbide precursor assembled in the prepared SBA-15 mesoporous m...

Embodiment 3

[0032] (1) Add 0.42g EO 20 PO 70 EO 20 (Molecular weight is 5800) template agent is dissolved in 100ml deionized water, add 41.7g hydrochloric acid (4M) under stirring condition in 45 ℃ water bath, continue stirring for 4 hours; Weigh ammonium paratungstate (5(NH 4 ) 2 O·12WO 3 ·5H 2 O) 1.30g (containing 0.05 moles of tungsten) was dissolved in 30ml of deionized water, then added to the above solution, continued to stir for 7 hours, then added 20.84g of tetraethyl orthosilicate (containing 0.1 moles of Si), continued to stir for 24 hours, and then , transferred to a Teflon-lined autoclave, crystallized at 90°C for 26 hours, filtered, washed, and suction-filtered, and the obtained solid was naturally dried at room temperature, then placed in a heating furnace at 2°C / min The heating rate is increased to 550 ° C, and the temperature is kept constant for 7 hours, that is, the solid sample of the tungsten carbide precursor assembled in the prepared SBA-15 mesoporous molecular ...

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Abstract

A meso-porous molecular sieve catalyst with tungsten carbide features that the tungsten 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 tungsten carbide and a preparation method thereof. It belongs to the field of catalytic technology. Background technique: [0002] Transition metal carbides (especially tungsten carbide) are a class of catalyst materials with catalytic properties similar to noble metals, and have shown excellent catalytic properties in reactions such as oil and gas hydrodesulfurization, denitrogenation, and hydrocarbon isomerization. , has attracted great attention in recent years (Metal carbides and nitrogenes aspotential 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/00B01J27/22
Inventor 季生福胡林华吴平易李成岳
Owner BEIJING UNIV OF CHEM TECH
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