Catalyst for directly converting syngas to prepare low-carbon olefin, and preparation method and application thereof

A low-carbon olefin and synthesis gas technology, which is applied in catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc. The effect of saving equipment investment and good stability

Inactive Publication Date: 2019-02-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low selectivity of low-carbon olefins in the traditional Fischer-Tropsch synthesis reaction, high equipment investment, high energy consumption, and easy deactivation of the catalyst in the two-step series reaction, and provides a one-step synthesis gas synthesis method. A dual-functional catalyst for producing low-carbon olefins with high selectivity, enabling CO activation and carbon-carbon coupling reactions to occur simultaneously, thus breaking the limitation of ASF (Anderson-Schulz-Flory) distribution in the traditional Fischer-Tropsch pathway and increasing the low-carbon olefins in the product , and reduce equipment investment costs and reaction energy consumption

Method used

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  • Catalyst for directly converting syngas to prepare low-carbon olefin, and preparation method and application thereof
  • Catalyst for directly converting syngas to prepare low-carbon olefin, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Composite metal oxide catalyst MO x -ZnO-NO y preparation. Weigh 26.84 parts of manganese nitrate (50% aqueous solution), 7.45 parts of zinc nitrate hexahydrate, and 0.03 parts of silver nitrate in distilled water to prepare a 1.0mol / L aqueous solution, and use sodium carbonate as a precipitating agent to prepare a 1.0mol / L solution Co-precipitation reaction occurs by co-current dripping method. By controlling the drop rate, the pH during the precipitation process is 7.0±0.2, the precipitation temperature is controlled at 30°C, and the titrated precipitate is aged at 30°C for 2 hours. The aged product The precipitate was washed with deionized water, dried at 80°C, and then baked in a muffle furnace at 450°C for 5h. Gained catalyst mass percentage is composed of: MnO 2 76.0%, ZnO 23.7%, Ag 2 O 0.3%.

[0028]Preparation of SAPO-34 molecular sieve catalyst (see attached table 1 for catalyst preparation parameter conditions). Weigh 30.08 parts by mass fraction of 35%...

Embodiment 2

[0032] Composite metal oxide catalyst MO x -ZnO-NO y preparation. Take by weight 29.83 parts of manganese nitrate (50% aqueous solution), 4.94 parts of zinc nitrate hexahydrate, and 0.03 parts of potassium nitrate dissolved in distilled water to prepare a 1.0mol / L aqueous solution, and use sodium carbonate as a precipitating agent to prepare a 1.0mol / L solution Co-precipitation reaction occurs by co-current dripping method, the pH of the precipitation during the precipitation process is controlled by controlling the dropping speed=7.5±0.2, the precipitation temperature is controlled at 40°C, and the titrated precipitate is aged at 40°C for 5h. The product was washed and precipitated with deionized water, dried at 80°C, and then baked in a muffle furnace at 420°C for 5h. Gained catalyst mass percentage is composed of: MnO 2 84.1%, ZnO15.7%, K 2 O 0.2%.

[0033] The preparation of SAPO-34 molecular sieve catalyst (catalyst preparation parameter conditions see attached tabl...

Embodiment 3

[0036] Composite metal oxide catalyst MO x -ZnO-NO y preparation. Weigh 28.64 parts of zirconium nitrate pentahydrate, 9.91 parts of zinc nitrate hexahydrate, 0.13 parts of lanthanum nitrate hexahydrate and dissolve in distilled water to prepare a 1.0mol / L aqueous solution, and use ammonia as a precipitating agent to prepare a 1.0mol / L aqueous solution , Co-precipitation reaction occurs by co-current dropping method, the precipitation pH is controlled by controlling the dropping speed = 8, the precipitation temperature is controlled at 45°C, the titrated precipitate is aged at 45°C for 3h, and the aged product is washed and precipitated with deionized water , after drying at 80 ° C, placed in a muffle furnace at 500 ° C for 5 hours. Gained catalyst mass percentage is composed of: ZrO 2 74.9%, ZnO 24.7%, La 2 o 3 0.4%.

[0037] The preparation of SAPO-34 molecular sieve catalyst (catalyst preparation parameter conditions see attached table 1), the specific preparation p...

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Abstract

The invention provides a catalyst for directly converting syngas to prepare low-carbon olefin, and a preparation method and an application thereof. The catalyst comprises a metal oxide catalyst MOx-ZnO-NOy for converting the syngas to prepare methanol and an SAPO-34 molecular sieve catalyst for converting the methanol to prepare the low-carbon olefin, wherein the metal oxide catalyst comprises, bymass, 29-85% of MOx, 14-64% of ZnO and 0.2-7% of an additive NOy; and a mass ratio of the MOx-ZnO-NOy to the SAPO-34 is 0.3-5. Traditional low-carbon olefin is synthesized through a two-step series reaction of the syngas (that is the methanol is synthesized from the syngas, and then is converted from methanol to the low-carbon olefin), and the catalyst in the invention allows the syngas to be directly selectively converted into the low-carbon olefin through a one-time reaction, so the energy consumption and the device investment cost are significantly reduced; and the catalyst also has a goodstability, and facilitates the large-scale industrial application.

Description

technical field [0001] The invention belongs to the technical field of catalytic conversion of synthesis gas, in particular to a catalyst for directly converting synthesis gas to produce low-carbon olefins. The invention also relates to the preparation method and application of the catalyst for direct conversion of synthesis gas to light olefins. Background technique [0002] Low-carbon olefins (ethylene, propylene, butene) represented by ethylene and propylene are important basic chemicals with a wide range of applications. Ethylene can be used to produce organic compounds such as polyethylene, ethanol, and ethylene glycol, and propylene can be used to produce polypropylene, acrylonitrile, and propylene oxide. In view of the current situation of coal-rich, oil-deficient and gas-poor in my country, coal is used as raw material to prepare synthesis gas (CO and H 2 ), and then produce light olefins (C2=-C4=) from syngas, which is an ideal way to convert non-petroleum resourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/00C07C1/04C07C11/08C07C11/06C07C11/04
CPCB01J29/85B01J37/0036C07C1/043C07C11/04C07C11/08C07C11/06Y02P20/52
Inventor 孟凡会张鹏李忠李小静
Owner TAIYUAN UNIV OF TECH
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