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Cobalt-based catalyst for direct conversion of syngas into low-carbon olefin and preparation method and application thereof

A technology of cobalt-based catalysts and low-carbon olefins, applied in physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high methane selectivity and low olefin selectivity and other problems, to achieve the effect of simple preparation method, easy industrial scale-up, and low preparation cost

Inactive Publication Date: 2015-12-02
上海睿碳能源科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of cobalt-based catalyst for the direct conversion of synthesis gas into light olefins and its preparation method and application, for solving the problem of Fischer-Tropsch synthesis in the prior art. The problem of low olefin selectivity and high methane selectivity in the reaction of preparing light olefins

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  • Cobalt-based catalyst for direct conversion of syngas into low-carbon olefin and preparation method and application thereof
  • Cobalt-based catalyst for direct conversion of syngas into low-carbon olefin and preparation method and application thereof

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preparation example Construction

[0034] refer to figure 1 A method for preparing a cobalt-based catalyst for direct conversion of synthesis gas into light olefins provided by the invention, said preparation method comprising the following steps:

[0035] Step S10: preparing a mixed salt solution;

[0036] Step S20: preparing a precipitant solution;

[0037] Step S30: coprecipitation reaction;

[0038] Step S40: After the co-precipitation reaction is completed, aging to obtain the slurry;

[0039] Step S50: drying and calcining the slurry, and then naturally cooling down to room temperature to obtain a cobalt-based catalyst.

[0040] Specifically, the preparation method of the cobalt-based catalyst for the direct conversion of synthesis gas into light olefins provided by the present invention can be:

[0041] First, perform step S10: prepare mixed salt solution: when the catalyst does not contain additives, the inorganic salt of cobalt and manganese or the organic salt of cobalt and manganese are formulate...

Embodiment 1

[0062] Cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) and manganese nitrate (50%wtMn(NO 3 ) 2 , aq) be dissolved in deionized water as 1:2 by Co, Mn atomic ratio, the preparation becomes the mixed nitrate solution of Co, Mn that the total metal ion concentration is 2mol / L; Na 2 CO 3 dissolved in deionized water to prepare Na + Alkaline solution with a concentration of 2mol / L. Choose SiO2 2 As a carrier, use the co-precipitation method to make the two solutions undergo precipitation reaction, control the precipitation pH=8, the precipitation temperature is 50°C, and the precipitation time is 2 The catalyst was calcined under atmosphere for 10 h, and the temperature was naturally lowered to room temperature. 1.5ml of catalyst was loaded into a fixed bed for pre-reduction, and the reduction atmosphere was pure hydrogen at 400°C under normal pressure; after the reduction was completed, H 2 / CO is 2:1 for synthesis gas to react, the reaction temperature is 250°C, the reaction pressur...

Embodiment 2

[0064] Cobalt acetate (C 4 h 6 CoO 4 4H 2 O) and manganese nitrate (50%wtMn(NO 3 ) 2 , aq) be dissolved in deionized water as 1:2 by Co, Mn atomic ratio, prepare to become the mixed nitrate solution that total metal ion concentration is 1mol / LCo, Mn; Na 2 CO 3 dissolved in deionized water to prepare Na + Alkaline solution with a concentration of 1mol / L. Choose SiO2 2 As a carrier, use the co-precipitation method to make the two solutions undergo precipitation reaction, control the precipitation pH=8, the precipitation temperature is 50°C, and the precipitation time is 2 The catalyst was calcined under atmosphere for 10 h, and the temperature was naturally lowered to room temperature. 1.5ml of catalyst was loaded into a fixed bed for pre-reduction, and the reduction atmosphere was pure hydrogen at 400°C under normal pressure; after the reduction was completed, H 2 / CO is 2:1 for synthesis gas to react, the reaction temperature is 250°C, the reaction pressure is 0.5MPa,...

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Abstract

The invention provides a cobalt-based catalyst for direct conversion of a syngas into low-carbon olefin and a preparation method and an application of the cobalt-based catalyst. The cobalt-based catalyst comprises cobalt, manganese, a carrier and an auxiliary, and is prepared by a coprecipitation method, wherein the molar ratio of cobalt to manganese is 1:30-30:1. The cobalt-based catalyst obtained in the invention has high activity at low temperature and low methane selectivity, is low in preparation cost, simple and convenient in preparation method, and easy for industrial scale-up; and the cobalt-based catalyst obtained in the invention is used in reaction for direct conversion of the syngas into low-carbon olefin, the reaction can reach a conversion rate per pass of 20% below 250 DEG C, and in the distribution of alkane, the content of methane can be controlled below 10%, the content of low-carbon olefin can reach 50% or above, and relatively high olefin / alkane ratio can be achieved simultaneously, with the low-carbon olefin / low-carbon alkane being 20 or above.

Description

technical field [0001] The invention relates to a cobalt-based catalyst and its preparation method and application field, in particular to a cobalt-based catalyst for direct conversion of synthesis gas into light olefins, its preparation method and application. Background technique [0002] Syngas is a mixture of hydrogen and carbon monoxide in varying proportions. Syngas can be converted into hydrocarbons, alcohols and other oxygenates by catalytic conversion of Fischer-Tropsch (FT) method. Commonly used catalyst active components in FT synthesis are iron, cobalt, nickel or ruthenium, and it is usually necessary to add a second or third metal component to improve catalytic performance. [0003] Low-carbon olefins refer to olefins with an atomic number less than or equal to 4, mainly ethylene, propylene and butene. Low-carbon olefins play a pivotal role in modern petroleum and chemical industries, and are very important chemical raw materials. With the rapid growth of my ...

Claims

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Application Information

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IPC IPC(8): B01J23/889C07C11/04C07C11/06C07C11/08C07C1/04
CPCY02P20/52
Inventor 于飞钟良枢孙予罕沈群安芸蕾李正甲齐行振肖亚宁刘斌王东飞
Owner 上海睿碳能源科技有限公司
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