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Silicoaluminophosphate molecular sieve with high silica-alumina ratio and CHA structure, and synthetic method thereof

A technology of silicon-aluminum phosphate and high silicon-aluminum ratio, applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silico-aluminophosphate, etc. Improved catalytic activity, good technical effect, and reduced coking rate

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] One of the technical problems to be solved by the present invention is the low silicon-aluminum ratio of silicon-aluminum phosphate molecular sieve with CHA structure, poor reactivity and fast coking rate when used in the production of low-carbon olefins from methanol. Aluminum molecular sieve, the molecular sieve has the advantages of high silicon-aluminum ratio, high reactivity in methanol to light olefins, and slow coking rate

Method used

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  • Silicoaluminophosphate molecular sieve with high silica-alumina ratio and CHA structure, and synthetic method thereof
  • Silicoaluminophosphate molecular sieve with high silica-alumina ratio and CHA structure, and synthetic method thereof
  • Silicoaluminophosphate molecular sieve with high silica-alumina ratio and CHA structure, and synthetic method thereof

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Effect test

Embodiment 1

[0029] Weigh 4.3g pseudoboehmite (70wt%, 0.029mmol), 1.7g H 3 PO 4 (85wt%, 0.015 mol) g was dissolved in 151.4mL deionized water, and after stirring evenly, the mixed solution was transferred to an oil bath environment at 40°C, and 2.43g TMAOH (40wt%, 0.06mol) and 126.2g Silica sol (40wt%, 0.84mol), sealed and vigorously stirred until evenly mixed, then put 3.1% USY seed crystals (molar ratio of silicon to aluminum mole ratio is 8.9) and NaCl into the reaction solution and oil Warm up the bath to 60 o C, continue to stir, and after complete mixing, place the crystallized mixture in a polytetrafluoroethylene-lined pressure vessel and crystallize at 140°C for 5 days. After filtering and washing, the product is dried at 130°C, and then heated to 500°C ℃ constant temperature calcination, the existing high silicon aluminum ratio CHA structure silicon aluminum phosphate molecular sieve product, the final silicon aluminum molar atomic ratio of the product measured by the plasma Per...

Embodiment 2

[0032] Weigh 11.5g aluminum isopropoxide (0.056mol) and 3.83g H 3 PO 4 (85wt%, 0.06 mol) g was put into 63.4mL deionized water, and after stirring evenly, the mixed solution was transferred to an oil bath environment at 60°C, and 3.83gBTAC (99wt%, 0.3mol) and 96g silica sol were added under stirring (40wt%, 0.64mol), sealed and vigorously stirred until evenly mixed, then put 2.6% of USY seed crystals (mole ratio of silicon to aluminum molecular is 3.5) and KCl into the reaction solution and raised the temperature of the oil bath to 80 o C Continue to stir, and after it is completely mixed, place the crystallized mixture in a pressure vessel with a polytetrafluoroethylene liner and crystallize at 180°C for 3 days. After the product is filtered and washed, it is dried at 110°C and then heated up Roast at a constant temperature of 550°C to obtain a high-silicon-aluminum ratio CHA-structure silicoaluminophosphate molecular sieve product. The final silicon-aluminum molar atom...

Embodiment 3

[0035] Will Al 2 o 3 The content is 4.3g pseudoboehmite (70wt%, 0.029mol), 5.0g H 3 PO 4 ( 85wt%, 0.043 mol) g, dissolved in 160.8mL deionized water, stirred evenly, transferred the uniformly mixed solution to an oil bath environment at 60°C, and added 13.8gTMAOH (40wt%, 0.033mol), 1.3 gTEA (0.013 mol) and 191.4g silica sol (40wt%, 1.28mol), and after the airtight and vigorous stirring until the mixture is uniform, the USY seed crystal with a silicon-aluminum ratio of 3.6% of the total weight of the dry basis of the reactant (molar ratio of silicon-aluminum molecules 2.4) and NaCl was put into the reaction solution and the oil bath was heated to 80 o C Continue to stir, and after being completely mixed, place the reaction mixture in a pressure vessel with a polytetrafluoroethylene liner and crystallize at 190°C for 1.5 days. The product is filtered and washed, dried at 120°C, and then heated Roast at a constant temperature of 550°C to obtain a high-silicon-aluminum-ra...

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Abstract

The invention discloses a silicoaluminophosphate molecular sieve with a high silica-alumina ratio and a CHA structure, and a synthetic method thereof. The problems of low silica-alumina ratio, poor activity on a methanol-to-low carbon olefin reaction, and fast coking rate of silicoaluminophosphate molecular sieve with the CHA structure are mainly solved. The atom ratio of silicon / aluminum of the silicoaluminophosphate molecular sieve with a high silica-alumina ratio and a CHA structure is 10-25. The silicoaluminophosphate molecular sieve with a high silica-alumina ratio and a CHA structure well solves the problems, and can be used in the methanol-to-low carbon olefin industrial production.

Description

technical field [0001] The invention relates to a silicon-aluminophosphate molecular sieve with a high silicon-aluminum ratio CHA structure and a synthesis method thereof. Background technique [0002] The traditional zeolite molecular sieve is composed of silicon-oxygen tetrahedron [SiO 4 ] 4- and alumina tetrahedron [AlO 4 ] 5- Connected by sharing oxygen atoms, collectively referred to as TO 4 Tetrahedron (primary structural unit), such as A-type, X-type, L-type, Y-type, mordenite developed in the 1940s and ZSM-n series prepared in the 1960s (ZSM-1, ZSM-5, ZSM-11, ZSM-22, ZSM-48, etc.) Zeolite molecular sieves, etc. With the continuous expansion of the application field of zeolite and the demand for new properties and performances of scientific research and development, a lot of energy has been devoted to the synthesis and preparation of new zeolite molecular sieves. [0003] In 1982, scientists Wilson S.T. and Flanigen E.M. of Union Carbide Corporation (UCC) succe...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08
Inventor 乔健肖景娴汪哲明滕加伟杨为民
Owner CHINA PETROLEUM & CHEM CORP
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