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Catalyst used for direct preparation of light olefin from synthetic gas, preparation method and application thereof

A technology of low-carbon olefins and catalysts, which is applied in the field of catalysts and preparations for direct production of low-carbon olefins from syngas, which can solve the problems of high catalyst loading, high cost, complex synthesis technology, etc., and achieve low selectivity and reduced Machine and energy requirements, effect of simplified process

Inactive Publication Date: 2013-06-19
SHANXI LUAN MINING GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The problem with the current catalysts for direct production of low-carbon olefins from syngas is that the catalysts mostly use precious metals, expensive raw materials, special carriers, complex synthesis technologies, high catalyst loads, and high costs, which make the marketization and industrialization of catalysts more difficult. barrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Example 1: Carry out reloading with the ratio of metal oxide and titanium dioxide ratio of 2:8, configure metal salt solution, Fe55%, Mn25%, Cu16%, K4%, mass fraction use ammonia water as precipitant to carry out co-current precipitation at 50 °C , aged at 80°C for 4 hours, filtered and impregnated with 2% potassium nitrate solution for 6 hours, dried in vacuum, baked at 700°C for 4 hours in a tube furnace, and reduced 4 hours at 500°C with hydrogen Hour. Put 4g of catalyst into a slurry bed reactor with a capacity of 250ml, at a space velocity of 1200h -1 , pressure 1.5MPa, H 2 :CO=2:1, the catalyst activity was evaluated under the condition of reaction temperature 320°C. When the reaction reaches the predetermined pressure and temperature, the gas product is detected by online gas chromatography after being stable for 5 hours. The carbon monoxide conversion rate is 62.89%, the olefin ratio is 6.04, and the weight of olefins in the organic gas phase reaches 60.72%; t...

example 2

[0038]Example 2: Carry out reloading with the ratio of metal oxide and alumina ratio 2:8, configure metal salt solution, Fe58%, Mn20%, Cu20%, K2%, use ammonium oxalate as precipitant, carry out parallel flow at 50 °C Precipitation, aged at 80°C for 4 hours, filtered and impregnated with 2% potassium nitrate solution for 6 hours, dried in vacuum, roasted at 700°C for 4 hours in a tube furnace, and reduced with hydrogen at 500°C 4 hours. Add 3ml of catalyst in the fixed bed reactor, at a space velocity of 1200h -1 , pressure 1.5MPa, H 2 : CO = 2: 1 condition, the influence of reaction temperature 320 ℃ on catalyst activity. After the reaction reaches the predetermined pressure and temperature, the gas product is detected by on-line gas chromatography after 5 hours of stability. water.

example 3

[0039] Example 3: Carry out reloading with the ratio of metal oxide, activated carbon and zirconia composite carrier ratio 2:8, configure metal salt solution, Fe58%, Mn20%, Cu20%, K2%, use ammonium carbonate as precipitating agent at 50 ℃ Carry out co-current precipitation, age at 80°C for 4 hours, filter and impregnate the filter cake with 2% potassium nitrate solution for 6 hours, vacuum dry, bake in a tube furnace at 700°C for 4 hours, and use hydrogen at 500°C Reduction under conditions for 4 hours. Put 3g of catalyst into a slurry bed reactor with a capacity of 250ml, at a space velocity of 1200h -1 , pressure 1.5MPa, H 2 : CO = 2: 1 condition, the influence of reaction temperature 320 ℃ on catalyst activity. After the reaction reaches the predetermined pressure and temperature, the gas product is detected by on-line gas chromatography after 5 hours of stability. water. After 100 hours of continuous driving, the catalyst has low wear and basically no carbon deposits. ...

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Abstract

The invention relates to a catalyst used for direct preparation of light olefin from synthetic gas, a preparation method and an application thereof. According to the invention, a parallel flow precipitation method is used to highly disperse Fe and auxiliary agents on surfaces of self-made alkaline carriers, and thus a catalyst load is low, a preparing technology is simple and a cost is lower than that of product with a same type. When the catalyst is used for direct preparation of the light olefin from the synthetic gas, a CO conversion rate can reach 75-85 % under a one-way catalytic condition of the synthetic gas, an alkene-alkane ratio can reach 4.5-6.0 in organic gas products, an alkene weight is 50-60 % and more than 98% of the liquid product is water. The catalyst is good in abrasion resistance and pressure resistance, and can be used for slurry beds and fixed beds. A reaction technology of the catalyst is that the temperature is 200-500 DEG C, a pressure is 0-5 MPa, and an air speed of the synthetic gas is 600-2400 <-1>.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for directly producing low-carbon olefins from synthesis gas, a preparation method and application thereof. Background technique [0002] Catalytic production of low-carbon olefins using syngas as raw material, including indirect method and direct method: the indirect method includes syngas synthesis of methanol, and then methanol cracking to produce low-carbon olefins (MTO method) and synthesis gas through dimethyl ether to produce low-carbon olefins Carbon olefin process (SDTO method). [0003] The direct method is the direct synthesis of light olefins from syngas without intermediate products (STO method). At present, many scientific research institutions and enterprises at home and abroad have conducted research in this area. [0004] The patent CN1065026A declared by the Lanzhou Institute of Chemical Physics uses a catalyst prepared by a variety of ...

Claims

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Application Information

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IPC IPC(8): B01J23/889C07C1/04C07C11/02
Inventor 王永刚王东飞章清许德平贺龙袁振樊邵狄晓茜胡树领陈思
Owner SHANXI LUAN MINING GRP
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