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A kind of synthetic method of sapo-34 molecular sieve with surface defect

A molecular sieve and defect technology, applied in the field of synthesis of SAPO-34 molecular sieve with cubic shape, can solve the problems of high cost, difficult to operate, not very excellent, etc., and achieve long reaction life, excellent catalytic performance, long low-carbon olefin selectivity Effect

Active Publication Date: 2020-02-14
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current methods for preparing SAPO-34 molecular sieves at home and abroad generally have defects such as high cost and complicated process, and the catalytic performance of the SAPO-34 molecular sieve thus prepared, for example, the ethylene selection of SAPO-34 molecular sieve in the MTO reaction Performance, reaction life and carbon capacity are not very good
In addition, if it is necessary to prepare a series of SAPO-34 molecular sieves with different grain shapes, it is necessary to change the template agent synthesized by the SAPO-34 molecular sieve, the way of feeding silicon-aluminum ratio, or the way of post-treatment modification. Obtaining different series of SAPO-34 molecular sieves with different grain shapes, the modulation process is cumbersome and complicated, and it is not easy to operate

Method used

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  • A kind of synthetic method of sapo-34 molecular sieve with surface defect
  • A kind of synthetic method of sapo-34 molecular sieve with surface defect
  • A kind of synthetic method of sapo-34 molecular sieve with surface defect

Examples

Experimental program
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Effect test

Embodiment 1

[0048] This embodiment provides a SAPO-34 molecular sieve with excellent catalytic performance. The synthesis of the SAPO-34 molecular sieve provided by the present embodiment comprises the following steps:

[0049] 1) Prepare the reaction system

[0050] 42.75g of pseudo-boehmite was added into 300g of deionized water, stirred and dispersed in a water bath at 30°C. Then slowly add 65.56g of phosphoric acid therein, and stir for 30min to form a gel. Then add 33.24g of silica sol and stir for 1h. Finally add 85.89g mixed template agent (the mixed template agent used is the mixture of triethylamine and tetraethylammonium hydroxide, wherein, the molar ratio of triethylamine and tetraethylammonium hydroxide is 50:1), stir for 1.5h , to get the reaction system.

[0051] 2) Put the above reaction system into a pressure-resistant reactor for dynamic hydrothermal crystallization

[0052] When performing dynamic hydrothermal crystallization, the temperature of dynamic hydrothermal...

Embodiment 2

[0055] This embodiment provides a SAPO-34 molecular sieve with excellent catalytic performance. The synthesis of the SAPO-34 molecular sieve provided by the present embodiment comprises the following steps:

[0056] 1) Prepare the reaction system

[0057] The preparation of the reaction system in this example is the same as in Example 1, that is, the raw materials and feeding ratios used in this example are the same as those in Example 1.

[0058] 2) Put the above reaction system into a pressure-resistant reactor for dynamic hydrothermal crystallization

[0059] When performing dynamic hydrothermal crystallization, the temperature of dynamic hydrothermal crystallization is 180°C, and the crystallization time is 6h.

[0060] 3) After the crystallization is completed, the SAPO-34 molecular sieve is obtained after washing, drying and roasting.

Embodiment 3

[0062] This embodiment provides a SAPO-34 molecular sieve with excellent catalytic performance. The synthesis of the SAPO-34 molecular sieve provided by the present embodiment comprises the following steps:

[0063] 1) Prepare the reaction system

[0064] The preparation of the reaction system in this example is the same as in Example 1.

[0065] 2) Put the above reaction system into a pressure-resistant reactor for dynamic hydrothermal crystallization

[0066] When performing dynamic hydrothermal crystallization, the temperature of dynamic hydrothermal crystallization is 185°C, and the crystallization time is 3h.

[0067] 3) After the crystallization is completed, the SAPO-34 molecular sieve is obtained after washing, drying and roasting.

[0068] The test result of the SAPO-34 molecular sieve that embodiment 1-3 provides is as table 1 and table 2, Figure 2 to Figure 4 shown. As can be seen from Examples 1-3, the technical scheme provided by the present invention can be...

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Abstract

The invention provides a method for synthesizing SAPO-34 molecular sieve with surface defects. The method includes: mixing silicon source, aluminum source, phosphorus source, template agent and water according to molar ratio to SiO 2 :Al 2 O 3 :P 2 O 5 :R :H 2 O=(0.5-0.8): 1: (0.8-1.2): (1-3): (40-80) After mixing in proportion, perform dynamic water treatment at a low temperature of 170-190℃ and a short time of 2-15h. After thermal crystallization, a cubic morphology SAPO-34 molecular sieve with surface defects was obtained. The SAPO-34 molecular sieve product obtained according to the technical solution provided by the present invention has surface defects and excellent catalytic performance for methanol to olefins.

Description

technical field [0001] The invention relates to a method for synthesizing a cubic shape SAPO-34 molecular sieve with surface defects, and belongs to the technical field of catalyst preparation. Background technique [0002] Ethylene and propylene, as basic organic raw materials in the modern chemical industry, can be used to produce various chemical products such as plastics, and their demand is increasing. The traditional diene production process is characterized by excessive dependence on petroleum resources. Under the background of unstable supply of petroleum resources and continuous price increase, the development of a new process route for producing ethylene and propylene has become a research focus. my country's energy structure is "rich in coal, short of oil, and low in gas", and the domestic process of methanol from coal is very mature, so the process of methanol to low-carbon olefins is of great significance to reduce dependence on oil and maintain my country's ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85B01J35/10C07C1/20C07C11/04
CPCC01B37/08C01B39/54C07C1/20B01J29/85C01P2004/03C01P2006/12C07C2529/85B01J35/617B01J35/613B01J35/633Y02P20/52Y02P30/20Y02P30/40
Inventor 申宝剑金文龙拓鹏飞王宝杰赵红娟张千帆申宝华韩华军王久江胡清勋熊晓云张莉赵晓争杨周侠
Owner PETROCHINA CO LTD
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