Capsule type catalyst for preparing low-carbon olefin by catalyzing synthesis gas and preparation method thereof

A low-carbon olefin and synthesis gas technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the role of the carrier cannot be fully exerted, and achieve the effect of improving selectivity

Inactive Publication Date: 2010-07-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore structure of the molecular sieve will change when the molecular sieve is loaded with active components, and the active metal on the outer surface is not affected by the pore structure of the carrier, which is unfavorable for obtaining high selectivity, and the role of the carrier cannot be fully exerted.

Method used

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  • Capsule type catalyst for preparing low-carbon olefin by catalyzing synthesis gas and preparation method thereof
  • Capsule type catalyst for preparing low-carbon olefin by catalyzing synthesis gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After weighing 22g ferric nitrate and dissolving it in water, mix it with 15g SiO 2 Pellets (1.18-2.15mm) were impregnated with equal volume for 1 hour, then dried at 100°C for 0.5h, and calcined at 550°C for 6 hours to obtain active pellets with catalytic conversion of synthesis gas to produce hydrocarbons.

[0016] In a 100ml polytetrafluoroethylene kettle, configure 60ml of a mixed solution of silane coupling agent (AP-TMS) and absolute ethanol with a volume ratio of 1:35, put 2g of the prepared active pellets, and keep it airtight at 100°C for 4h. Rinse with ethanol to remove residual silane coupling agent on the surface, then mix with 0.3wt% ethanol solution of 60ml Silicalite-1 molecular sieve seed crystals, place in a 100ml polytetrafluoroethylene kettle, keep it airtight at 100°C for 4 hours, take it out, and rinse with ethanol , and then dried at 100° C. and calcined at 300° C. for 6 hours to obtain pellets coupled with Silicalite-1 molecular sieve crystal seed...

Embodiment 2

[0019] The active pellets prepared in Example 1 were used to prepare capsule-type catalysts, and the implementation method was the same as in Example 1, except that the crystallization time was 2 days, and other steps were the same.

Embodiment 3

[0021] The active pellets prepared in Example 1 are used to prepare capsule-type catalysts, and the implementation method is the same as in Example 1, except that the film-forming liquid formula is changed to TEOS: 0.25TPAOH: 350H 2 Except for O, other steps are the same.

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Abstract

The invention relates to a capsule type catalyst for preparing low-carbon olefin by catalyzing synthesis gas and a preparation method thereof. The catalyst is characterized in that the surfaces of spherules with the activity of preparing hydrocarbons through catalytic conversion of synthesis gas are coated with inert molecular sieve membranes with shape selectivity. The preparation method is characterized by coupling molecular sieve seed crystals on the active spherules and then further growing the molecular sieve membranes by a hydrothermal process. The thickness and morphology of the molecular sieve membranes can be controlled by regulating the ratios of H2O/SiO2 and H2O/template agent in molecular sieve precursor solution and the crystallization temperature and time, thereby affecting the desorption shape selectivity of the products and further improving the selectivity of the low carbon olefins.

Description

Technical field: [0001] The invention relates to a capsule-type catalyst for producing low-carbon olefins from syngas and a preparation method thereof. Background technique: [0002] Syngas (CO and H 2 ) can be widely sourced from coal, natural gas, biomass, etc., and the production of chemicals through syngas has become an important oil alternative process route. Low-carbon olefins are key intermediates for synthetic plastics, fibers and various chemical materials, and are important basic chemical raw materials. Compared with the existing process of preparing low-carbon olefins from syngas through methanol, the process of direct catalytic conversion of syngas to prepare low-carbon olefins has a short route, low investment and low operating costs, so it has broad development prospects. [0003] The direct preparation of hydrocarbons from syngas mainly comes from Fischer-Tropsch synthesis, which was founded by F.Fischer and H.Tropsch in Germany in 1923, but the selectivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/10B01J29/035C07C1/04C07C11/02
Inventor 王蕾姜南张香平张锁江李增喜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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