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A kind of preparation method of core-shell structure molecular sieve containing metal

A core-shell structure and molecular sieve technology, applied in the field of catalysis, can solve the problems of decreased selectivity of olefin products, unsuitable application, etc., and achieve the effects of low selectivity, low value-added by-products, and short induction period

Active Publication Date: 2018-11-30
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additional hydrogen atmosphere is not suitable for application in the MTP reaction due to production safety reasons and possible decrease in the selectivity of olefin products.

Method used

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  • A kind of preparation method of core-shell structure molecular sieve containing metal
  • A kind of preparation method of core-shell structure molecular sieve containing metal
  • A kind of preparation method of core-shell structure molecular sieve containing metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of Au-containing core-shell structure molecular sieve Au-MCM-41 / SAPO-34:

[0031]1) Mix 10mL of cetyltrimethylammonium bromide in 100mL of distilled water and 10mL of concentrated ammonia water to form an alkaline solution, and stir in a water bath at 50-60°C until the cetyltrimethylammonium bromide is completely dissolved; Then slowly add tetraethyl orthosilicate dropwise at a speed of 1mL / min until a white precipitate is formed, stop the dropwise addition, continue stirring for 3 hours, cool to room temperature, and suction filter after crystallization at room temperature for 3 days, and use anhydrous Wash with ethanol and distilled water until the filtrate becomes neutral, and dry it in a vacuum oven at 100°C to obtain the original powder of MCM-41.

[0032] 2) The original MCM-41 powder obtained in step (1) is a silicon source, and pseudo-boehmite is added as an aluminum source, phosphoric acid, template agent, HAuCl 4 The aqueous solution and water are...

Embodiment 2

[0043] Preparation of Au-containing core-shell structure molecular sieve Au-SBA-15 / SAPO-34:

[0044] 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 add tetraethyl orthosilicate dropwise at a speed of 1mL / min until a white precipitate is formed, stop the dropwise addition, continue stirring for 3 hours, cool to room temperature, and suction filter after crystallization at room temperature for 3 days, and use anhydrous Wash with ethanol and distilled water until the filtrate is neutral, and dry it in a vacuum oven at 100°C to obtain the original powder of SBA-15.

[0045] 2) Add pseudo-boehmite as aluminum source, phosphoric acid, templating agent, HAuCl to the SBA-15 raw powder obtained in step 1) as silicon source 4 The aqueous solution and water are mixed ...

Embodiment 3

[0057] To prepare molecular sieves Pt-MCM-41 / SAPO-34 containing Pt core-shell structure, the metal sol was replaced by chloroplatinic acid, and the rest of the preparation method was the same as in Example 1.

[0058] Reaction condition is with implementation example 1. The activity evaluation results of the metal-containing core-shell structure molecular sieve are shown in Table 3.

[0059] table 3

[0060]

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Abstract

The invention discloses a preparation method of a metal-containing core-shell structure molecular sieve. A common mesoporous structure MCM-41 or SBA-15 molecular sieve serves as an inner core, SAPO-34 serves as a shell, metal nanoparticles are added in a water bath process, and the metal exists in the surface of the core-shell structure molecular sieve catalyst in the form of highly dispersible nanoparticles, so that the carbon deposition resistance of the molecular sieve catalyst is improved and the life of the molecular sieve catalyst is prolonged, the diffusion resistance of a target product is reduced in the presence of the MCM-41 or SBA-15 mesoporous structure, the hydrothermal temperature of the SAPO-34 is reduced by a microwave heating method, the hydrothermal reaction time is reduced, damage to the MCM-41 or SBA-15 mesoporous structure in the hydrothermal process is reduced, the problems that the conventional microporous molecular sieve has low selectivity of propylene which is the metal-containing core-shell structure molecular catalyst target product and is susceptible to carbon deposition and deactivation are solved, and the preparation method of the metal-containing core-shell structure molecular sieve is suitable for other methanol conversion reaction.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a metal-containing core-shell structure molecular sieve. 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 great strategic significance for realizing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85C07C1/20C07C11/04C07C11/06
CPCB01J29/005B01J29/041B01J29/85C07C1/20C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 刘蓉王晓龙何忠肖天存
Owner CHINA HUANENG GRP CO LTD
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