A kind of preparation method of transition metal modified silicalite catalyst

A technology of stevensite and transition metal, which is applied in the field of preparation of transition metal-modified ferrierite catalyst, can solve the problems of high cost and easy deactivation of the catalyst, and achieves the advantages of reducing production cost, solving easy deactivation and facilitating popularization. Effect

Active Publication Date: 2019-12-13
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology has problems such as high catalyst cost and easy deactivation.

Method used

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  • A kind of preparation method of transition metal modified silicalite catalyst
  • A kind of preparation method of transition metal modified silicalite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Weigh 0.602g of magnesium sulfate, add 9.0g of deionized water, the molar ratio of magnesium sulfate to water is 1:100, add 5g of 98% concentrated sulfuric acid, stir at room temperature for 0.5h to obtain a uniform solution of magnesium sulfate and sulfuric acid a.

[0027] b. Weigh the silicon source water glass Na 2 SiO 3 •9H 2 O 71.125g, add 90g deionized water, the molar ratio of water glass and water is 1:20, stir at room temperature for 0.5h, form a uniform solution, and obtain solution B.

[0028] c. Under vigorous stirring at a speed of 150r / min, slowly drop the mixed solution A of the previous step into the solution B of this step, and at the same time add 11.518g of ethanol as a template agent, and the molar ratio of the template agent to water glass is 1:1. After stirring for 2h, a homogeneous solution C was obtained.

[0029] c. Stir the solution C for 0.5 h with a high-speed shear emulsifying glue maker, and put the obtained gel into a polytetraflu...

Embodiment 1

[0034] The catalyst activity test figure of embodiment 1 is as figure 1 It can be seen from the figure that the T50 (the temperature at which the conversion rate of toluene is 50%, the same below) for the catalytic degradation of toluene by the catalyst is 240°C, and the T90 is 289°C. The catalyst has good catalytic activity for catalytic degradation of toluene.

[0035] The catalyst activity test figure of embodiment 1 is as figure 1 As mentioned above, it can be seen from the figure that the experimental results of the catalytic life of the catalyst for 100 hours. The experimental condition is that the intake air velocity is 10000h -1 , the intake toluene concentration is 1000ppm, and the catalytic temperature is 300°C. It can be seen from the figure that the catalytic activity of the catalyst does not change much after 100 hours of continuous catalysis, and the catalytic efficiency drops by 4.5%, so the catalyst has good catalytic stability.

Embodiment 2

[0037] a. Weigh 0.602g of magnesium sulfate, add 8.1g of deionized water, the molar ratio of magnesium sulfate and water is 1:90, add 5g of 98% concentrated sulfuric acid, stir at room temperature for 0.5h, and obtain a uniform mixed solution of magnesium sulfate and sulfuric acid a.

[0038] b. Weigh 142.250g of water glass Na2SiO3•9H2O, add 270g of deionized water, the molar ratio of water glass to water is 1:30, stir at room temperature for 0.5h, and form a uniform solution solution B.

[0039] c. Under vigorous stirring, at a speed of 150r / min, slowly add solution A to solution B, and simultaneously add 32.045g of methanol as a template agent, the molar ratio of template agent to water glass is 1:0.5, stir for 3h, A homogeneous solution C was obtained.

[0040] d. Stir the solution C for 0.5 h with a high-speed shear emulsifying glue maker, put the obtained gel into a polytetrafluoroethylene-lined hydrothermal crystallization kettle for 24 h to crystallize, and the crysta...

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Abstract

The invention relates to a preparation method of a transition metal modified silicon-magnesium zeolite catalyst. The preparation method comprises steps as follows: a, magnesium sulfate is added to deionized water, concentrated sulfuric acid is added, and a solution A is obtained; b, a silicon source is added to the deionized water, and a solution B is obtained; c, the solution A is slowly added to the solution B, meanwhile, a template agent is added, and a solution C is obtained; d, the solution C is stirred for 0.5 h at high speed, and obtained gel is put in a hydrothermal crystallization kettle for crystallization; e, a solution obtained after crystallization in the step d is subjected to suction filtration, a mother solution is removed, a product is dried in a drying oven at the temperature of 100 DEG C for 24 h, and raw silicon-magnesium zeolite powder is obtained; f, the raw silicon-magnesium zeolite powder is added to a metallic nitrate solution and stirred for 2 h, a co-precipitation agent is dropwise added, pH is regulated to 10, a mixture is stirred and dried in the shade, and a catalyst precursor is obtained; g, the catalyst precursor is roasted at the temperature of 500-600 DEG C. The silicon-magnesium zeolite catalyst prepared with the method has the advantages of high catalytic activity and good stability.

Description

technical field [0001] The invention belongs to the field of environmental protection materials, in particular it relates to a preparation method of a transition metal modified silicalite catalyst. Background technique [0002] The "Thirteenth Five-Year Plan for Ecological and Environmental Protection" requires that by 2020, the total national VOCs emissions will drop by more than 10%. The implementation of this plan puts forward high requirements for VOCs control technology. Common VOCs control technologies can be divided into two categories: one is recovery technology, mainly including adsorption technology, absorption technology, condensation technology and membrane separation technology; the other is destruction technology, mainly including thermal incineration technology, catalytic combustion technology, Biological treatment technology and photocatalytic technology. Catalytic combustion technology has been widely concerned and developed rapidly due to its advantages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01D53/86B01D53/72
CPCB01D53/8668B01D2255/2073B01D2255/20738B01D2255/50B01D2257/7027B01J29/78
Inventor 牛建瑞钱恒力王曼段二红刘洁刘浩彬
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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