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A catalyst for directly producing low-carbon olefins from synthesis gas and its preparation and application

A low-carbon olefin and catalyst technology, applied in the field of iron-based catalysts, can solve the problems of complex catalyst composition, low CO conversion rate, complicated preparation process, etc., and achieve the effects of reducing selectivity, avoiding secondary reactions, and simple preparation method

Active Publication Date: 2018-05-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN104056627A has reported that a relatively inert iron source is a precursor loaded on an inert carrier to prepare a Fischer-Tropsch catalyst with high selectivity to generate low-carbon olefins, which has a higher selectivity for olefins, but given in the examples The CO conversion rate is obviously too low
Chinese patents CN104226327A and CN103773409A reported that silica and alumina were used as catalysts for supporting iron in the Fischer-Tropsch synthesis of synthesis gas. It was reported that high CO conversion and olefin selectivity were obtained, but the composition of the catalyst was too complicated , there are more than 3 kinds of necessary additives, which makes the preparation process very complicated and difficult to repeat
In the existing literature and patents, there is no information on the use of iron-loaded catalysts with spherical supports and additives for Fischer-Tropsch synthesis of syngas

Method used

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  • A catalyst for directly producing low-carbon olefins from synthesis gas and its preparation and application
  • A catalyst for directly producing low-carbon olefins from synthesis gas and its preparation and application
  • A catalyst for directly producing low-carbon olefins from synthesis gas and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Take 1.523g of silicon carbide dried at 120°C for 10h, add 25mL of ferric nitrate solution containing 0.689g into the silicon carbide, stir continuously at room temperature for 10h, and then evaporate to dryness under negative pressure at 90°C, and dry at 120°C 12h, and then roasted in a muffle furnace at 350°C for 5h to obtain Fe 2 o 3 Catalyst A at 13% by weight.

Embodiment 2

[0031]Take 8.245g of manganese dioxide dried at 120°C for 10h, add 100mL of a solution containing 6.256g of ferric nitrate and 1.198g of ammonium molybdate into the manganese dioxide, stir continuously at room temperature for 10h, and then rotary evaporate at 90°C under negative pressure to Dry and dry at 120°C for 12h, and then bake in a muffle furnace at 450°C for 5h to obtain Fe 2 o 3 Content is 18.22wt%, MoO 3 Catalyst B at 9.01% by weight.

Embodiment 3

[0033] Take 4.526g of titanium dioxide dried at 120°C for 10h, add 50mL solution containing 4.256g of ferric nitrate and 0.322g of potassium nitrate into the titanium dioxide, stir continuously at room temperature for 10h, and then evaporate to dryness under negative pressure at 90°C and dry at 120°C Drying for 12 hours under the hood, and finally roasting in a muffle furnace at 450°C for 5 hours to obtain Fe 2 o 3 The content is 23.1wt%, K 2 Catalyst C with an O content of 5.3 wt%.

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Abstract

The invention discloses a preparation method of a catalyst capable of synthesizing synthesis gas into low-carbon olefins with high selectivity. The invention adopts the compound with spherical or ellipsoidal structure as carrier to load iron oxide and adds additives for the Fischer-Tropsch reaction of synthesis gas. On the one hand, this type of catalyst has high catalytic activity; on the other hand, it can effectively reduce the secondary reaction hydrogenation of low-carbon olefins to form alkanes, and improve the selectivity of low-carbon olefins. The catalyst has a simple preparation method and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas conversion, and relates to an iron-based catalyst for directly producing low-carbon olefins from synthesis gas through a Fischer-Tropsch synthesis route, as well as its preparation and application. Background technique [0002] Low-carbon olefins including ethylene, propylene and butene are important chemical raw materials, which mainly come from the cracking of naphtha. With the reduction of crude oil resources and the increasingly prominent environmental problems, at the same time, the large-scale development of shale gas has made it challenging to obtain olefins from petroleum routes and has become unsustainable. Therefore, more and more attention has been paid to the production of low-carbon olefins by non-petroleum routes. As an alternative technical route for the production of low-carbon olefins such as ethylene and propylene, the direct production of low-carbon olefins from syngas is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/224B01J23/889B01J23/78C07C11/04C07C11/06C07C11/08C07C1/04C10G2/00
CPCY02P20/52
Inventor 刘小浩胥月兵姜枫
Owner JIANGNAN UNIV