Catalyst for preparing olefins from synthetic gas and preparation method thereof

A catalyst and synthesis gas technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor C2-C4 olefin selectivity, and achieve the improvement of low-carbon olefin selectivity, activity, and improvement. selective effect

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is the poor selectivity of C2-C4 olefins in Fischer-Tropsch synthesis in the prior art, and a catalyst for producing olefins from synthesis gas is provided, which is used for Fischer-Tropsch synthesis and has C2-C4 olefin selectivity High advantage, two of the technical problem to be solved by the present invention is to provide a kind of catalyst preparation method corresponding to one of the technical problems

Method used

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  • Catalyst for preparing olefins from synthetic gas and preparation method thereof
  • Catalyst for preparing olefins from synthetic gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 24.9g of ferric nitrate hexahydrate, 21.6g of manganese nitrate with a mass concentration of 50% and 5.04g of copper nitrate trihydrate were dissolved in water to form a solution.

[0028] 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.

[0029] Add 0.15 g of ammonium selenate to 9.5 g of potassium hydroxide solution with a mass concentration of 20%, then add it into the catalyst and stir evenly, let it stand for 10 minutes, then bake at 100°C for 4 hours, and then roast at 600°C for 2 hours to obtain the catalyst core .

[0030]Using PDDA (polydiallyldimethylammonium chloride) as a binder, ZSM-5 nano-crystal seeds are adsorbed on the catalyst core, added to the molecular sieve synthesis liquid for reaction, and a layer of silicon aluminum is formed outside the catalyst core The ZSM-5 molecular sieve shell with a ratio of 14 was dried at 100°C for 4 hours and...

Embodiment 2

[0032] Dissolve 76.2g of ferric nitrate hexahydrate, 10.8g of zinc nitrate hexahydrate and 10.7g of magnesium nitrate hexahydrate in water to form a solution.

[0033] Weigh 60.7g of the silica carrier, impregnate the above solution on the carrier, and bake at 60°C until there is no excess moisture outside the catalyst particles.

[0034] Add 2.14 grams of ammonium selenate to 5.84 grams of sodium hydroxide solution with a mass concentration of 20%, then add it to the catalyst and stir evenly, let it stand for 10 minutes, then bake at 80°C for 8 hours, and then roast at 700°C for 8 hours to obtain the catalyst core .

[0035] Using PSS (sulfonated polystyrene) as a binder, ZSM-5 nano-crystal seeds are adsorbed on the catalyst core, and added to the molecular sieve synthesis solution to react, and a layer of ZSM-5 with a silicon-aluminum ratio of 22 is formed outside the catalyst core. 5 molecular sieve shells, dried at 80°C for 8 hours, and calcined at 600°C for 2 hours to ob...

Embodiment 3

[0037] 19.9g of ferric nitrate hexahydrate, 31g of manganese nitrate with a mass concentration of 50% and 47.5g of cobalt nitrate hexahydrate were dissolved in water to form a solution.

[0038] Weigh 75.1g 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.

[0039] Add 0.15 g of ammonium tellurate to 0.57 g of potassium hydroxide solution with a mass concentration of 20%, then add it to the catalyst and stir evenly, let it stand for 10 minutes, then bake at 120°C for 7.5 hours, and then bake at 650°C for 6 hours to obtain the catalyst core .

[0040] Using APTS (8-aminopyrene-1,3,6-triammonium trisulfonate) as a binder, ZSM-5 nano-seeds are adsorbed on the catalyst core, added to the molecular sieve synthesis liquid for reaction, and then reacted in the catalyst core A layer of ZSM-5 molecular sieve shell with a silicon-aluminum ratio of 75 was formed on the outside, dried at 12...

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Abstract

The present invention relates to a catalyst for preparing olefins from synthetic gas and a preparation method thereof, and mainly solves the poor middle and low-C2-C4 olefin selectivity problem of tropsch synthesis. The catalyst for preparing the olefins from the synthetic gas comprises the following components in parts by weight: 1-20 parts of ZSM-5 shell and 80-99 parts of an inner core, the inner core includes 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 selected from Fe or Co; c) 1-10 parts of at least one metal or oxide selected from Mn, Zn, Mg or Cu; d) 0.1-5 parts of an oxide or a hydroxide selected from K, Na, Rb or Cs; and e) 0.1-2 parts of at least one oxide selected from Se and Te; and by the technical scheme, the problem is well solved, and the catalyst can be used for industrial production of preparing of olefins from synthetic gas.

Description

technical field [0001] The invention relates to a catalyst for producing olefins from synthesis gas and a preparation method thereof. technical background [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 Applications(China)
IPC IPC(8): B01J29/48B01J29/46C07C11/04C07C11/06C07C1/04
CPCY02P20/52
Inventor 宋卫林陶跃武李剑锋庞颖聪
Owner CHINA PETROLEUM & CHEM CORP
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