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Silicon-doped aluminophosphate and method for synthesis thereof

A technology of aluminophosphate and silicon doping, which is applied in the direction of molecular sieve characteristic silicoaluminophosphate, chemical instruments and methods, molecular sieve and alkali exchange phosphate, etc., which can solve the problem of late research on the artificial synthesis of aluminum phosphate molecular sieve, no structure discovery, etc. question

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with zeolite molecular sieves, the artificial synthesis of aluminum phosphate molecular sieves is relatively late
In 1971, Flanigen et al. reported the synthesis of aluminum phosphate molecular sieves [Molecular Sieve Zeolites-I, ACS, Washington D.C]. Under hydrothermal synthesis conditions, mixed oxides of aluminum, silicon and phosphorus were obtained with analcime, chabazite, phillipsite -harmotome, L-type molecular sieve, A-type molecular sieve and B-type molecular sieve and other silicon-phosphorus-aluminum molecular sieves with the same crystal structure, wherein the content of phosphorus is 5-25% (as P2O5 ), but no structure different from zeolite molecular sieves was found

Method used

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  • Silicon-doped aluminophosphate and method for synthesis thereof
  • Silicon-doped aluminophosphate and method for synthesis thereof
  • Silicon-doped aluminophosphate and method for synthesis thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 22 grams of 16.31% N,N'-[1,4-phenylene bis(methylene)]bis(1,4-diazacyclo[2,2,2]octane) Ammonium hydroxide (hereinafter abbreviated as R) solution, then while stirring, add 0.43 grams of aluminum isopropoxide and 0.31ml concentration of 2% silica sol, then slowly add 0.68ml concentration of 85% phosphoric acid solution After stirring evenly, a synthetic mother liquor with the following molar ratios can be obtained:

[0026] 0.05SiO2 2 :1.0Al 2 o 3 :2.4P 2 o 5 :4.8R:190H 2 o

[0027] The above synthetic mother liquor was placed in a closed reaction vessel for crystallization, the crystallization temperature was 175°C, and the crystallization time was 84 hours. After the crystallized product was washed and dried, a silicon-doped aluminophosphate was obtained, and its XRD pattern Such as figure 1 As shown, the composition of the obtained silicon-doped aluminophosphate is (excluding water content) (Si 0.01 al 0.5 P 0.49 )O 2 .

Embodiment 2

[0029]Weigh 16.5 grams of 16.31% N,N'-[1,4-phenylene bis(methylene)]bis(1,4-diazacyclo[2,2,2]octane) Ammonium hydroxide (hereinafter abbreviated as R) solution, then add 0.43 gram of aluminum isopropoxide and 0.31ml concentration of 2% silica sol while stirring, then slowly add 0.68ml concentration of 85% phosphoric acid solution After stirring evenly, a synthetic mother liquor with the following molar ratios can be obtained:

[0030] 0.05SiO2 2 :1.0Al 2 o 3 :2.4P 2 o 5 :3.6R:142H 2 o

[0031] The above synthetic mother liquor was placed in a closed reaction container for crystallization, the crystallization temperature was 175°C, and the crystallization time was 84 hours. After the crystallized product was washed and dried, a silicon-doped aluminophosphate was obtained. The obtained doped The composition of the aluminophosphate of silicon is (excluding water content) (Si 0.01 al 0.5 P 0.49 )O 2 .

Embodiment 3

[0033] Weigh 24.8 grams of 16.31% N,N'-[1,4-phenylene bis(methylene)]bis(1,4-diazacyclo[2,2,2]octane) Ammonium hydroxide (hereinafter abbreviated as R) solution, then add 0.43 gram of aluminum isopropoxide and 0.31ml concentration of 2% silica sol while stirring, then slowly add 0.68ml concentration of 85% phosphoric acid solution After stirring evenly, a synthetic mother liquor with the following molar ratios can be obtained:

[0034] 0.05SiO2 2 :1.0Al 2 o 3 :2.4P 2 o 5 :5.4R:213H 2 o

[0035] The above synthetic mother liquor was placed in a closed reaction container for crystallization, the crystallization temperature was 175°C, and the crystallization time was 84 hours. After the crystallized product was washed and dried, a silicon-doped aluminophosphate was obtained. The obtained doped The composition of the aluminophosphate of silicon is (excluding water content) (Si 0.01 al 0.5 P 0.49 )O 2 .

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Abstract

The invention relates to a novel silicon-doped aluminophosphate and a synthetic method thereof. The novel silicon-doped aluminophosphate, on the premise of not calculating the water content, has the chemical composition (Si<x>Al<y>P<z>)O<2> at the following molar ratio: x is more than or equal to 0.001 and less than or equal to 0.1, y is more than or equal to 0.3, z is more than or equal to 0.3, and x + y + z is equal to 1, and the molecular sieve has a unique X-ray diffraction pattern, can be used as an adsorbent, and can also be used as a catalyst or a catalyst carrier.

Description

technical field [0001] The invention relates to a silicon-doped aluminophosphate and a preparation method thereof. Background technique [0002] Molecular sieves are a kind of porous crystalline materials. There are more than 230 types of molecular sieves with known structures, and molecular sieves with new structures are constantly emerging. Most molecular sieves have a large internal specific surface area and an open internal space, which can be used as a place for the reaction to occur, and can also be used to accommodate some guest molecules, such as metals, metal oxides, organic molecules, water molecules, and so on. Since molecular sieves have uniform and regular pores, and the size of the pores is of the same order as that of molecules, it is possible to "select" the entry and exit of molecules, thereby obtaining a shape-selective effect. Because molecular sieves have the above characteristics, they are widely used as catalysts, catalyst carriers, adsorbents and dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/08C01B39/54B01J20/18B01J29/85
CPCC01B37/08C01B39/54B01J20/18B01J29/85C01P2002/72Y02P20/52
Inventor 袁志庆滕加伟付文华刘松霖
Owner CHINA PETROLEUM & CHEM CORP
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