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A kind of preparation method of sba-15/sapo-34 core-shell structure molecular sieve for methanol to propylene reaction

A SAPO-34, methanol-to-propylene technology, applied in the field of catalysis, can solve problems such as easy carbon deposition and deactivation, low propylene selectivity, and reduce the diffusion resistance of the target product, and achieve good anti-carbon deposition performance, low selectivity, Effect of good mechanical and hydrothermal stability

Active Publication Date: 2018-11-09
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a kind of preparation method of the SBA-15 / SAPO-34 core-shell structure molecular sieve that is used for methanol to propylene reaction, the prepared SBA-15 / SAPO-34 core-shell structure molecular sieve SBA-15 mesoporous structure The existence of the presence of the target product reduces the diffusion resistance of the target product, and solves the problem of low selectivity of the target product propylene and easy carbon deposition and deactivation of the conventional microporous molecular sieve catalyst.

Method used

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  • A kind of preparation method of sba-15/sapo-34 core-shell structure molecular sieve for methanol to propylene reaction
  • A kind of preparation method of sba-15/sapo-34 core-shell structure molecular sieve for methanol to propylene reaction
  • A kind of preparation method of sba-15/sapo-34 core-shell structure molecular sieve for methanol to propylene reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Add 4g of P123 to 100mL of secondary water and 20.7mL of concentrated HCI, stir and sonicate until the solid is completely dissolved, add 9.14mL of TEOS drop by drop under vigorous stirring in a constant temperature water bath at 40°C, continue to stir for 20h, and then stand at 90°C Crystallization for 24 hours to form the crystal nucleus or crystallite of SBA-15;

[0030] 2) Take silica sol as the silicon source and add pseudoboehmite, phosphoric acid, template agent triethylamine TEA or morpholine, crystal nuclei or microcrystals of SBA-15, and water to form a crystallization stock solution, wherein SBA -15 accounts for 20% of the total molecular sieve content, phosphoric acid according to P 2 o 5 Calculate such that Si:Al=1:1, P 2 o 5 :Al 2 o 3 =2:1, TEA: Al 2 o 3 = 2:1, H 2 O: Al 2 o 3=90:1;

[0031] 3) Transfer the crystallization stock solution to a hydrothermal kettle lined with tetrafluoroethylene, and then put it into a rotating kettle at 190°C f...

Embodiment 2

[0041] With uncalcined SBA-15 as the core and SAPO-34 as the shell, the synthesis of core-shell molecular sieves adopts a hydrothermal method; 30wt% silica sol is used as a silicon source, and pseudo-boehmite is used as an aluminum source; orthophosphoric acid ( 85%) is the phosphorus source in the synthetic raw materials; triethylamine (99%, TEA) is used as the template for molecular sieve synthesis. Adjust the content of the external silicon source to obtain the crystallization stock solution Si:Al=1:2, 1:1, 2:1, 3:1, and the rest of the preparation method is the same as in Example 1.

[0042] The activity evaluation result of this catalyst is shown in Table 2

[0043] Table 2

[0044]

Embodiment 3

[0046] The preparation method of the SBA-15 / SAPO-34 core-shell structure molecular sieve that is used for the reaction of methanol to propylene adopts a hydrothermal method for the synthesis of the core-shell structure molecular sieve with unroasted SBA-15 as the core and SAPO-34 as the shell; 30wt% silica sol was used as silicon source, pseudoboehmite was used as aluminum source; orthophosphoric acid (85%) was used as phosphorus source in the synthesis raw material; morpholine (99%, Mor) was used as template for molecular sieve synthesis. Adjust the content of the external silicon source to obtain the crystallization stock solution Si:Al=1:2, 1:1, 2:1, 3:1, and the rest of the preparation method is the same as in Example 1.

[0047] Reaction condition is with implementation example 1. The activity evaluation results of the catalyst are shown in Table 3.

[0048] table 3

[0049]

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Abstract

A preparation method of SBA-15 / SAPO-34 core-shell structural molecular sieve for methanol-to-ethanol reaction; a common mesoporous structure SBA-15 molecular sieve is used as a core SAPO-34 is used as a shell, and the prepared core-shell molecular sieve is used as a catalyst to enable methanol-to-acrylate reaction, the presence of SBA-15 mesoporous is present, reducing diffusion resistance of target products and solving the problem that a conventional microporous molecular sieve has low propylene selectivity for target catalyst products and easily experiences carbon deposition, causing deactivation.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of SBA-15 / SAPO-34 molecular sieve with core-shell structure used in the methanol-to-propylene reaction. Background technique [0002] Methanol-to-olefins (MTO) is a key technology to realize the clean conversion and utilization of coal in the new coal chemical industry that my country focuses on. It can replace the traditional petroleum route to realize the diversified development of olefin raw materials; and the production cost is lower. wide attention at home and abroad. The development of methanol-to-olefins technology, especially methanol-to-propylene (MTP) technology, can extend the downstream industrial chain of the coal chemical industry to produce high value-added products such as polypropylene, acrylonitrile, isopropanol and propylene oxide, thereby improving economic benefits. The development of methanol-to-propylene technology is of g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85C07C1/20C07C11/06C07C11/04
CPCB01J29/85C07C1/20C07C2529/85C07C11/06C07C11/04Y02P20/52Y02P30/20Y02P30/40
Inventor 刘蓉王晓龙何忠肖天存
Owner CHINA HUANENG GRP CO LTD
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