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Catalyst for producing olefins from synthesis gas and preparation method thereof

A synthesis gas and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., to achieve good technical effects, improve activity, and improve selectivity

Active Publication Date: 2017-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts encounter varying degrees of difficulties in the preparation of repeatable performance, scale-up preparation and other procedures

Method used

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  • Catalyst for producing olefins from synthesis gas and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 24.9g of ferric nitrate hexahydrate, 21.6g of manganese nitrate with a mass concentration of 50% and 5.04g of copper nitrate trihydrate in water to form a solution.

[0024] Weigh 66.3g of silica carrier, impregnate the above solution on the carrier, and bake at 60°C until there is no excess moisture outside the catalyst particles.

[0025] Add 9.51 g of potassium hydroxide solution with a mass concentration of 20%, stir evenly, let stand for 10 minutes, then bake at 100°C for 4 hours, and then roast at 600°C for 2 hours to prepare the catalyst core.

[0026] The slurry containing 20 grams of ZSM-5 molecular sieves with a Si / Al molar ratio of 30 was sprayed onto the prepared catalyst core, dried at 100°C for 4 hours, and calcined at 550°C for 2 hours to obtain the catalyst 80Fe 6 mn 5 Cu 2 K 2 (SiO 2 ) 100-20 (ZSM-5), the numbers outside the brackets are parts by weight.

Embodiment 2

[0028] Dissolve 77.4g of ferric nitrate hexahydrate, 10.9g of zinc nitrate hexahydrate and 10.86g of magnesium nitrate hexahydrate in water to form a solution.

[0029] Weigh 61.7g of silica carrier, impregnate the above solution on the carrier, and bake at 60°C until there is no excess moisture outside the catalyst particles.

[0030] Add 14 g of sodium hydroxide solution with a mass concentration of 20%, stir evenly, let stand for 10 minutes, then bake at 80°C for 8 hours, and then roast at 700°C for 8 hours to prepare the catalyst core.

[0031] Spray-coat the slurry containing 15 grams of β molecular sieve with a Si / Al molar ratio of 45 on the prepared catalyst core, dry at 80°C for 8 hours, and roast at 600°C for 2 hours to obtain the catalyst 85Fe 18 Mg 1.5 Zn 3.5 Na 1 (SiO 2 ) 90 -15β, the numbers outside the brackets are parts by weight.

Embodiment 3

[0033] Dissolve 19.9g of ferric nitrate hexahydrate, 31.01g of manganese nitrate with a mass concentration of 50% and 47.5g of cobalt nitrate hexahydrate in water to form a solution.

[0034] Weigh 75.4g of alumina carrier, impregnate the above solution on the carrier, and bake at 60°C until there is no excess moisture outside the catalyst particles.

[0035] Add 0.55 g of potassium hydroxide solution with a mass concentration of 20%, stir evenly, let stand for 10 minutes, then bake at 120°C for 7.5 hours, and then roast at 650°C for 6 hours to obtain the catalyst core.

[0036] A slurry containing 2 grams of ZSM-5 molecular sieve with a Si / Al molar ratio of 10 was sprayed onto the prepared catalyst core, dried at 120°C for 7.5 hours, and calcined at 400°C for 7.5 hours to obtain the catalyst 98 Co 10 Fe 4 mn 6 K 0.1 (Al 2 o 3 ) 95 -2 (ZSM-5), the numbers outside the brackets are parts by weight.

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Abstract

The invention relates to a catalyst for olefin prepared by synthesis gas and a preparation method of the catalyst, and mainly aims to solve the problem of low selectivity of low C2-C4 olefin in fischer-tropsch synthesis. The problem can be well solved by adopting a technical scheme that the catalyst is prepared from the following components in parts by weight: 1-20 parts of a shell which is one of ZSM-5 and beta zeolite and 80-99 parts of a kernel, wherein the kernel comprises the following components in parts by weight: (a) 80-100 parts of a carrier selected from SiO2 or Al2O3, (b) 3-20 parts of at least one metal or oxide of Fe and Co carried on (a), (c) 1-10 parts of at least one metal or oxide of Mn, Zn, Mg and Cu, and (d) 0.1-5 parts of oxide or hydroxide of K, Na, Rb and Cs. The catalyst can be applied to industrial production of olefin preparation by synthesis gas.

Description

technical field [0001] The invention relates to a catalyst for producing olefins from synthesis gas and a preparation method thereof. Background technique [0002] Low-carbon olefins (olefins with carbon atoms ≤ 4) represented by ethylene and propylene are the basic raw materials of the chemical industry. At present, the main raw materials of low-carbon olefins in the world are petroleum hydrocarbons, of which naphtha accounts for the majority, and there are Alkanes, hydrogenated diesel oil, some heavy oil, etc. At home and abroad, natural gas or light petroleum fractions are mostly used as raw materials, and low-carbon olefins are produced by steam cracking in ethylene complexes. Steam cracking is a large energy-consuming device in petrochemical industry, and it completely depends on non-renewable petroleum resources. With the increasing shortage of oil resources, it is urgent to find alternative resources. Therefore, the research work of producing olefins from natural g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/48B01J29/072B01J29/076C07C1/04C07C11/02C10G2/00
Inventor 宋卫林陶跃武庞颖聪李剑锋
Owner CHINA PETROLEUM & CHEM CORP
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