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Composite mesoporous-microporous structure SAPO-34 molecular sieve and synthesis method thereof

A SAPO-34, Microporous Structure Technology

Pending Publication Date: 2020-06-19
中科催化新技术(大连)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three catalysts have the advantages of large pore size, uniform pore size distribution, and large specific surface area, but the catalytic effect is not ideal in the reaction of methanol to olefins

Method used

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  • Composite mesoporous-microporous structure SAPO-34 molecular sieve and synthesis method thereof
  • Composite mesoporous-microporous structure SAPO-34 molecular sieve and synthesis method thereof
  • Composite mesoporous-microporous structure SAPO-34 molecular sieve and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-18

[0037] See Table 1 for specific batching dosage and crystallization conditions. The specific batching process is as follows, mix and stir the aluminum source and the long-chain quaternary ammonium salt OSDA, and record it as mixture A. Mix silicon source, phosphorus source and deionized water and stir for 30 minutes, then add the mixture to mixture A, stir vigorously for 30 minutes in an airtight state to make it evenly mixed, and obtain the initial gel mixture, transfer the initial gel mixture to stainless steel In the reaction kettle, the temperature is raised to a certain temperature, and the crystallization is performed under dynamic conditions for a certain period of time. After the crystallization, the solid product was centrifuged, washed, and dried in the air at 100°C to obtain the raw powder (composite meso-microporous structure SAPO-34 molecular sieve). The sample was analyzed by XRD, and the result showed that the synthesized product was SAPO-34 molecular sieve. T...

Embodiment 22

[0048] The samples obtained in Example 1 and Comparative Example 1 were calcined at 600° C. for 4 hours, and then pressed into tablets and crushed to 20-40 meshes. Weigh 1.0g sample and load it into a fixed-bed reactor for MTO reaction evaluation. Activate at 550°C for 1 hour with nitrogen gas, and then lower the temperature to 450°C for reaction. Methanol is carried by nitrogen, the nitrogen flow rate is 40ml / min, and the methanol weight space velocity is 2.0h -1 . The reaction product was analyzed by online gas chromatography (Varian3800, FID detector, capillary column PoraPLOTQ-HT), and the results are shown in Table 2. By comparison, it is found that the reaction life of Example 1 (178min) is longer than that of Comparative Example 1 (140min), and the diene selectivity (92.45%) is higher than that of Comparative Example 1 (86.46%), so Example 1 has more excellent catalytic performance active.

[0049] Methanol conversion to olefins reaction results of the sample in Tab...

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Abstract

The invention provides a composite mesoporous-microporous structure SAPO-34 molecular sieve and a synthesis method thereof. A long-chain quaternary ammonium salt is adopted as a novel organic structure directing agent to synthesize an SAPO-34 molecular sieve catalyst with mesopores and micropores at the same time. The novel organic structure directing agent is an organic long-chain quaternary ammonium salt with an R1-(CH3)2N-R2 structure, wherein R1 is a straight-chain or branched-chain alkyl group containing 2-4 carbon atoms or a cycloalkane group containing 4-8 carbon atoms, R2 is a straight-chain or branched-chain alkyl group containing 10-30 carbon atoms, and anions can be one or more of hydroxide ions, chloride ions, bromide ions and the like. Compared with an SAPO-34 catalyst prepared from other template agents, the SAPO-34 molecular sieve catalyst synthesized by the method has a unique composite mesoporous-microporous structure, and the service life of the catalyst can be prolonged to a certain extent while the selectivity of ethylene and propylene in MTO reaction is effectively improved.

Description

technical field [0001] The invention belongs to the field of SAPO molecular sieves, and in particular relates to a composite meso-microporous structure SAPO-34 molecular sieve and a synthesis method thereof. Background technique [0002] Ethylene, propylene and other low-carbon olefins are used to synthesize plastics, fibers, resins and other products. They are one of the most basic raw materials in the petrochemical industry and are also the most consumed basic chemicals. The production of light olefins in the world today mainly comes from the cracking petrochemical route of light hydrocarbons (ethane, naphtha, light diesel oil). And my country is a country rich in coal and poor in oil. With the surge in demand for global energy and chemical products, the price of oil continues to rise. It is of great significance to develop the technology of producing low-carbon olefins such as ethylene and propylene through synthesis gas using coal as raw material. At present, the indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/08C01B39/54B01J29/85B01J35/10C07C1/20C07C11/04C07C11/06
CPCC01B37/08C01B39/54B01J29/85C07C1/20B01J2229/14B01J35/64B01J35/615C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 王亮李宏伟贺大威潘宏锋曲宜越尚庆胜薛福云陈茂重姜月姚心如常琳张爱霞季彦利
Owner 中科催化新技术(大连)股份有限公司
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