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Porous silicon dioxide carrier and preparation method and application thereof

A technology of porous silica and silica, applied in the direction of silica, silica, catalyst carrier, etc., can solve the problems of complex process and high cost, and achieve the effect of high conversion rate and stability, and good catalytic performance

Active Publication Date: 2021-03-19
北京水木滨华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent uses more complex organic substances and flame retardants, the process is more complicated, and the cost is higher

Method used

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  • Porous silicon dioxide carrier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1.1 Preparation of pore-protected silica

[0046] Dissolve 10g of sucrose in 500ml of water, add 5ml of concentrated sulfuric acid. Then 1000-mesh silicon dioxide powder is immersed in an equal volume of sucrose acid solution, and stirred evenly. The specific surface area of ​​the silica powder used is 339m 2 / g, the pore volume is 1.18ml / g. The impregnated silica powder was placed in an oven at 80°C for 6h to dry, and then heated to 160°C for 6h for dehydration and carbonization. The carbonized silica powder needs to be washed with deionized water until it becomes neutral, and then put into an oven at 120°C for 24 hours to dry.

[0047] 1.2 Preparation of silica support

[0048] After the carbonized silica powder, flour, and field essence powder are mixed evenly, 30wt% silica sol is dissolved in 10wt% nitric acid aqueous solution, and the nitric acid aqueous solution of silica sol is evenly sprayed in the carbonized silica powder and mixed into a plastic form. Th...

Embodiment 2

[0060] Dissolve 15g of sucrose in 500ml of water, add 8ml of concentrated sulfuric acid. Then 1000-mesh silicon dioxide powder is immersed in an equal volume of sucrose acid solution, and stirred evenly. The specific surface area of ​​silica powder is 339m 2 / g, the pore volume is 1.18ml / g. The impregnated silica powder was dried in an oven at 80°C for 6h, and then heated to 160°C for 12h for dehydration and carbonization. The carbonized silica powder needs to be washed with deionized water until it becomes neutral, and then put into an oven at 120°C for 24 hours to dry.

[0061] The process of carrier shaping and calcination is the same as in Example 1 to obtain porous silica.

[0062] The preparation steps of the isobutylene oxyacetylation catalyst and the evaluation of the isobutylene oxyacetylation catalyst are the same as in Example 1.

[0063] The physical properties of the porous silica sample are as follows: specific surface area: 214m 2 / g, pore volume: 1.08ml / g....

Embodiment 3

[0070] Dissolve 25g of sucrose in 500ml of water, add 10ml of concentrated sulfuric acid. Then 1000-mesh silicon dioxide powder is immersed in an equal volume of sucrose acid solution, and stirred evenly. The specific surface area of ​​silica powder is 339m 2 / g, the pore volume is 1.18ml / g. The impregnated silica powder was dried in an oven at 80°C for 6 hours, and then heated to 160°C for 24 hours for dehydration and carbonization. The carbonized silica powder needs to be washed with deionized water until it becomes neutral, and then put into an oven at 120°C for 24 hours to dry.

[0071] The process of carrier molding and calcination is the same as in Example 1 to obtain porous silica.

[0072] The preparation steps of the isobutylene oxyacetylation catalyst and the evaluation of the isobutylene oxyacetylation catalyst are the same as in Example 1.

[0073] The physical properties of the porous silica sample are as follows: specific surface area: 215m 2 / g, pore volume...

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Abstract

The invention discloses a porous silicon dioxide carrier as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) impregnating silicon dioxidepowder with an acid solution of a saccharide compound, and dehydrating and carbonizing the impregnated material to obtain silicon dioxide with protected pore channels, namely a carbon-containing precursor; and (2) roasting the carbon-containing precursor obtained in the step (1) to obtain the porous silicon dioxide. The specific surface area of the porous silicon dioxide is not less than 200m<2> / g, and the pore volume is not less than 1.0 ml / g. When being used as an isobutylene oxyacetylation catalyst carrier, the porous silicon dioxide has better catalytic performance, and has the advantagesof high conversion rate and high stability.

Description

technical field [0001] The invention belongs to the field of catalysts and catalyst carriers, and in particular relates to a porous silica carrier and its preparation method and application. Background technique [0002] Silica is widely used as an important catalyst and catalyst carrier. The preparation of silica with large specific surface area and high porosity has always been a research hotspot. [0003] Chinese patent document CN87100996.X discloses a method for preparing water-resistant silica gel with adjustable pore structure. However, in the process of preparing silica carrier by rolling molding, extrusion molding, etc., using porous silica powder as raw material and silica sol as a binder, fluid silica sol enters into the mixture during the mixing process. In the silica gel channel, silica gel particles formed after molding and roasting adhere to the silica gel channel, causing the silica gel channel to be blocked, which will greatly reduce the surface area and p...

Claims

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Application Information

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IPC IPC(8): C01B33/18B01J21/08B01J23/89B01J35/10B01J32/00C07C67/055C07C69/14
CPCC01B33/18B01J21/08B01J23/8926C07C67/055C01P2006/12C01P2006/14B01J35/638B01J35/615C07C69/14
Inventor 王世华赵文芳郭伟宋立明郑虓
Owner 北京水木滨华科技有限公司
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