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Double-micropore SAPO (silicoaluminophosphate)-34/SAPO-18 composite molecular sieve, and preparation method and application thereof

A technology of SAPO-34 and SAPO-18, applied in the direction of molecular sieve and alkali exchange of phosphate, can solve the problem of catalyst deactivation, and achieve the effect of high synthesis efficiency, optimized performance and short crystallization time

Active Publication Date: 2017-04-19
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] SAPO-34 molecular sieve is made of SiO 2 , AlO 2 - , PO 2 + Microporous crystals composed of three tetrahedral units, whose crystal structure is similar to chabazite type (CHA), exhibit excellent catalytic performance in the reaction of methanol to light olefins, but it is easy to form carbon deposits rapidly during the reaction process and lead to rapid catalyst deactivation

Method used

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  • Double-micropore SAPO (silicoaluminophosphate)-34/SAPO-18 composite molecular sieve, and preparation method and application thereof
  • Double-micropore SAPO (silicoaluminophosphate)-34/SAPO-18 composite molecular sieve, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) 8.22g of pseudo-boehmite (alumina content 62% by weight, the same below), 11.53g of phosphoric acid (concentration of 85% by weight) and 38.88g of deionized water were mixed and stirred respectively, and after vigorous stirring for 1 hour, solidified dropwise Content is 40% by weight of silica sol 2.25g, after stirring evenly, add templating agent triethylamine (TEA) 10.12g, continue to stir for 2h, room temperature 20 ℃ aging 2h; The material molar ratio of each component in the obtained raw material mixture A is : 2TEA:0.3SiO 2 :Al 2 o 3 :P 2 o 5 :50H 2 O. Put the above-mentioned gel raw material mixture A into a reaction kettle with a polytetrafluoroethylene lining, and conduct hydrothermal pre-crystallization at 200°C for 10 hours to obtain pre-crystallization solution S1;

[0050] The pseudo-boehmite (aluminum oxide content 62% by weight, hereinafter the same) of 8.22g, 11.53g phosphoric acid (concentration 85% by weight) and 35.05g deionized water were mi...

Embodiment 2

[0053] 1) 8.22g of pseudo-boehmite, 11.53g of phosphoric acid (concentration: 85% by weight) and 6.84g of deionized water were mixed and stirred respectively, and after vigorous stirring for 1 hour, 4.50g of silica sol with a solid content of 40% by weight was added dropwise, After stirring evenly, 55.24 g of an aqueous solution of tetraethylammonium hydroxide (TEAOH) with a concentration of 20% by weight was added, stirring was continued for 2 h, and aging was performed at room temperature at 20° C. for 2 h. The molar ratio of each component in the obtained raw material mixture A is: 1.5TEAOH:0.6SiO 2 :Al 2 o 3 :P 2 o 5 :65H 2 O. Put the above-mentioned gel raw material mixture A into a reaction kettle with a polytetrafluoroethylene liner, and conduct hydrothermal pre-crystallization at 200°C for 6 hours to obtain pre-crystallization solution S1;

[0054] 8.22g of pseudo-boehmite, 10.37g of phosphoric acid (concentration 85% by weight) and 39.95g of deionized water were...

Embodiment 3

[0057] 1) 8.22g of pseudo-boehmite, 11.53g of phosphoric acid (concentration: 85% by weight) and 42.93g of deionized water were mixed and stirred respectively, and after vigorous stirring for 1 hour, 4.5g of silica sol with a solid content of 40% by weight was added dropwise, After stirring evenly, 10.12 g of template triethylamine (TEA) was added, stirring was continued for 2 h, and aging was performed at room temperature at 20° C. for 2 h. The molar ratio of each component in the resulting raw material mixture A is: 2TEA:0.6SiO 2 :Al 2 o 3 :P 2 o 5 :55H 2 O. Put the above-mentioned gel raw material mixture A into a reaction kettle with a polytetrafluoroethylene lining, and conduct hydrothermal pre-crystallization at 200°C for 10 hours to obtain pre-crystallization solution S1;

[0058]8.22g of pseudo-boehmite, 10.37g of phosphoric acid (concentration 85% by weight) and 48.95g of deionized water were mixed and stirred respectively, and after vigorous stirring for 1 hour...

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Abstract

The invention relates to the field of molecular sieves, and particularly provides a double-micropore SAPO (silicoaluminophosphate)-34 / SAPO-18 composite molecular sieve, and a preparation method thereof. The method comprises the following steps of: (1) carrying out pre-crystallization on a raw material mixture A used for synthesizing SAPO-34 to obtain pre-crystallized liquid S1 which does not contain solids, and carrying out pre-crystallization on a raw material mixture B used for synthesizing SAPO-18 to obtain pre-crystallized liquid S2 which does not contain solids; and (2) mixing the pre-crystallized liquid S1 and the pre-crystallized liquid S2, carrying out crystallization, separating the solids from crystallized liquid, and carrying out roasting after drying is carried out or drying is not carried out. The invention also discloses the application of the double-micropore SAPO-34 / SAPO-18 composite molecular sieve in low carbon olefins prepared from organic oxygen-containing compounds. The ratio of the molecular sieve SAPO-34 to the molecular sieve SAPO-18 is adjustable, when the double-micropore SAPO-34 / SAPO-18 composite molecular sieve is applied to the industrial production of the low carbon olefins prepared from organic oxygen-containing compounds, an ethylene-propylene ratio in the product is adjustable, and the catalytic activity of the molecular sieve is high.

Description

technical field [0001] The present invention relates to a preparation method of a double microporous SAPO-34 / SAPO-18 composite molecular sieve, and the double microporous SAPO-34 / SAPO-18 composite molecular sieve obtained by the method of the present invention, and the double microporous SAPO-18 composite molecular sieve of the present invention Application of 34 / SAPO-18 composite molecular sieves as catalyst active components in the production of light olefins from organic oxygenates. Background technique [0002] SAPO-34 molecular sieve is made of SiO 2 , AlO 2 - , PO 2 + Microporous crystals composed of three tetrahedral units, whose crystal structure is similar to chabazite type (CHA), exhibit excellent catalytic performance in the reaction of methanol to light olefins, but it is easy to form carbon deposits rapidly during the reaction and lead to rapid deactivation of the catalyst. [0003] SAPO-18 molecular sieve is an AEI molecular sieve with a microscopic pore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54
Inventor 郭磊朱伟平李飞薛云鹏孙先勇
Owner CHNA ENERGY INVESTMENT CORP LTD
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