Method for preparing supported molecular sieve catalyst by using vacuum impregnation method

A vacuum impregnation and molecular sieve technology, applied in molecular sieve catalysts, including molecular sieve catalysts, catalysts, etc., can solve the problems of easy carbon deposition and deactivation, low propylene selectivity, etc., and achieve good carbon deposition resistance, high selectivity, and low additional The effect of less by-products

Inactive Publication Date: 2018-07-13
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is beneficial to reduce the agglomeration of metal ions in the reaction process, improve the carbon deposition resistance of molecular sieve catalysts, and prolong the life of molecular sieve catalysts. The problem of carbon deactivation also applies to other transformation reactions

Method used

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  • Method for preparing supported molecular sieve catalyst by using vacuum impregnation method
  • Method for preparing supported molecular sieve catalyst by using vacuum impregnation method
  • Method for preparing supported molecular sieve catalyst by using vacuum impregnation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Au-MCM-41 / SAPO-34 molecular sieve with core-shell structure prepared by vacuum impregnation method:

[0031] (1) Put 10mL of cetyltrimethylammonium bromide in the alkaline solution formed by mixing 100mL of distilled water and 10mL of concentrated ammonia water, and stir in a water bath at 50-60°C until completely dissolved; Slowly add ethyl orthosilicate dropwise until a white precipitate is formed, continue stirring for 3 hours, cool to room temperature, and crystallize at room temperature for 3 days, then filter with suction, wash with absolute ethanol and distilled water until the filtrate is neutral, and use Dry in a vacuum oven at 100°C to obtain the original powder of MCM-41 mesoporous molecular sieve.

[0032] (2) The original powder of MCM-41 mesoporous molecular sieve obtained in step (1) is used as silicon source, pseudo-boehmite is added as aluminum source, and phosphoric acid, TEA template agent and water are added to mix and stir for more than 0.5h to form c...

Embodiment 2

[0047] Au-SBA-15 / SAPO-34, a core-shell structure molecular sieve containing Au, was prepared by vacuum impregnation method:

[0048] (1) Put 10g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer in an alkaline solution formed by mixing 100mL of distilled water and 10mL of concentrated ammonia water, and stir in a water bath at 55°C until completely dissolved ; Then slowly drop tetraethyl orthosilicate at a speed of 1mL / min until a white precipitate is generated, continue to stir and react for 3h, cool to room temperature, and suction filter after crystallization at room temperature for 3 days, and use absolute ethanol and distilled water Wash until the filtrate is neutral, and dry it in a vacuum oven at 100°C to obtain the original powder of SBA-15 mesoporous molecular sieve.

[0049] (2) The original powder of SBA-15 mesoporous molecular sieve obtained in step (1) was used as silicon source, pseudoboehmite was added as aluminum source, and phosph...

Embodiment 3

[0063] Prepare the molecular sieve Pt-MCM-41 / SAPO-34 containing Pt core-shell structure, replace the metal sol with chloroplatinic acid, and the rest of the preparation method is the same as in Example 1.

[0064] Reaction condition is with implementation example 1. The activity evaluation results of the loaded molecular sieve prepared by vacuum impregnation method are shown in Table 3

[0065] table 3

[0066]

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Abstract

The invention discloses a method for preparing a supported molecular sieve catalyst by using a vacuum impregnation method. A molecular sieve of a multi-stage pore structure is prepared by adopting a common MCM-41 or SBA-15 molecular sieve of a mesoporous structure as a core and SAPO-34 as a shell, and then the vacuum impregnation method is adopted to load metal nanoparticles; a molecular sieve carrier is firstly degassed before impregnation, and after air in the pore structure is removed, the carrier can be combined with a metal solution more tightly, so that dispersity of the metal nanoparticles on the carrier is improved, reduction of metal ion agglomeration in the reaction process is facilitated, the carbon deposition resistance of the molecular sieve catalyst is improved, the life of the molecular sieve catalyst is prolonged, and the problems of low target-product propylene selectivity and easy carbon-depositing inactivation of a supported molecular sieve catalyst which is preparedby using conventional microporous molecular sieves and the vacuum impregnation method are solved; the supported molecular sieve catalyst is also suitable for other conversion reactions.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of molecular sieve catalysts, and in particular relates to a method for preparing supported molecular sieve catalysts by adopting a vacuum impregnation method. 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 tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/02C07C1/20C07C11/04C07C11/06C07C11/08
CPCB01J29/005B01J29/0325B01J29/85B01J35/006B01J35/0066B01J37/0201B01J2229/18C07C1/20C07C2529/85C07C11/04C07C11/06C07C11/08Y02P20/52Y02P30/20Y02P30/40
Inventor 刘蓉王晓龙王琪何忠肖天存
Owner CHINA HUANENG GRP CO LTD
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