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Porous material and method for producing the same

A manufacturing method and porosity technology, applied in the field of raw material composition for the synthesis of porous metal fluorides, can solve the problems of pore structure damage and unstable use

Inactive Publication Date: 2011-01-12
权恒道
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since these silicates or metal oxides are corroded by the reaction in the environment of corrosive gases such as hydrogen fluoride, the fine pore structure is destroyed, so they have the disadvantage that they cannot be used stably.

Method used

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  • Porous material and method for producing the same
  • Porous material and method for producing the same
  • Porous material and method for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Sodium silicate (Na 2 SiO 3 , 3g) was dissolved in 28% ammonia water (114ml), and was added into chromium trichloride aqueous solution (about 10% chromium content, 240g) while vigorously stirring. The pH after mixing is about 7. The precipitate was filtered and taken out, washed with deionized water, dried, and fired in a nitrogen atmosphere at 450° C. to obtain a chromium salt of a silicon-containing precursor. The specific surface area measured by BET method is 366m 2 / g.

Embodiment 2

[0060] The precursor prepared in Example 1 was treated with nitrogen-diluted hydrogen fluoride (hydrogen fluoride / nitrogen=1 / 3) at room temperature for 4 hours, then the temperature was raised, and finally, only hydrogen fluoride was used at 350°C to obtain a porous Chromium fluoride. The specific surface area measured by BET method is 176m 2 / g.

Embodiment 3

[0062] The porous chromium fluoride prepared in Example 2 was used as a catalyst for gas-phase fluorination of dichloromethane. Gasify dichloromethane (0.3g / min) and anhydrous hydrogen fluoride (300ml / min), react in the presence of a catalyst, wash the product with water, dry it with soda lime, and analyze it with gas chromatography. Difluoromethane (CH 2 f 2 ) and chlorofluoromethane (CH 2 The yield of CIF) is shown in Table 1.

[0063] 【Table 1】

[0064]

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Abstract

A material composition is disclosed which is preferably used for synthesizing a porous metal fluoride which has a large surface area and is stable in a corrosive environment. A porous metal fluoride obtained by subjecting such a material composition to hydrogen fluoride treatment has a larger surface area and is stable in a corrosive environment, and thus can be used as a fluorination catalyst.

Description

technical field [0001] The present invention relates to a raw material composition for synthesizing a porous metal fluoride, a porous metal fluoride obtained by fluorinating the raw material, a fluorine catalyst containing the porous metal fluoride, and a method for producing a fluorine compound using the catalyst. Background technique [0002] Porous substances having micro- and medium-sized pores are widely used in catalysts, selective separations, selective reactions, sensors, and the like (Non-Patent Document 1). However, almost all such porous substances are silicates or metal oxides (Non-Patent Documents 2 and 3). Since these silicates and metal oxides are corroded by reaction in an environment of a corrosive gas such as hydrogen fluoride, the fine pore structure is destroyed, and thus they cannot be stably used. [0003] Metal fluorides have been used as stable porous substances, such as porous aluminum fluoride (non-patent literature 4, 5), porous magnesium fluoride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/04C01G51/08C01G53/08C01G9/04C01G15/00C01G23/02C01B9/08C07C19/08C07C17/20C07B61/00B01J27/132B01J23/26B01J23/86B01J35/10B01J37/03B01J37/26C01F5/28C01F7/50C01F11/22C07C19/10
CPCB01J37/031B01J37/26C07C19/08B01J35/1014B01J23/864B01J23/26B01J27/132C01B9/08B01J35/1019B01J35/613B01J35/615
Inventor 权恒道杨会娥田村正则关屋章
Owner 权恒道
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