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Method for synthesizing carbon hydrocarbon compound through CO2 hydrogenation

A hydrocarbon compound and carbon synthesis technology, which is applied in the direction of carbon compound catalysts, preparation of liquid hydrocarbon mixtures, chemical instruments and methods, etc., can solve the problem of low selectivity of high-carbon hydrocarbons, and achieve the effect of solving the fossil resource crisis

Active Publication Date: 2021-11-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low selectivity of high-carbon hydrocarbons in the current CO2hydrogenation method for hydrocarbon compounds , providing a method for CO2 hydrogenation to synthesize hydrocarbons, specifically, the present invention provides a K-M co-promoted Fe-based catalyst, which is used to catalyze CO2 hydrogenation reaction to solve the above problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a CO 2 The method for hydrogenation to synthesize hydrocarbons, the specific process is: first place the K-M co-promoted Fe-based catalyst through a sieve with a mesh number of 80 and then place it in a high-pressure continuous-flow fixed-bed reactor. 2 The temperature was raised to 400°C for 2 hours at a heating rate of 5°C / min, and then the reactor was cooled to room temperature, and the pressure was 3MPa containing 73vol% H 2 and 24vol% CO 2 The mixed gas is introduced into the reactor, and 3vol% nitrogen in the mixed gas is used as the internal standard, and the space velocity is 6000mLg -1 the s -1 The temperature-programmed catalytic reaction was carried out under the conditions of , the reaction temperature was 340°C, and the reaction time was 2h; wherein, the K-M co-promoted Fe-based catalyst and the mixed gas mass volume ratio in the reactor was 1g:100mL. CO 2 After the hydrogenation reaction, CO 2 The conversion rate was 29.58%, CH 4 The selectivity is 2...

Embodiment 2

[0075] a CO 2 The method for synthesizing hydrocarbons by hydrogenation is basically the same as in Example 1, except that K-M jointly promotes the preparation step of the Fe-based catalyst.

[0076] The preparation steps of K-M co-promoting Fe-based catalysts are basically the same as in Example 1, except that the transition metal M precursor is cobalt nitrate, and the content of Fe element and transition metal M in the prepared catalyst are adjusted by adjusting the reaction parameters. And the content of alkali metal K is with embodiment 1.

[0077] CO 2 After the hydrogenation reaction, CO 2 The conversion rate is 33.13%, CH 4 The selectivity is 27.28%, the CO selectivity is 18.44%, the carbon hydrocarbon selectivity with 2 to 4 carbon atoms is 36.99%, and the carbon hydrocarbon selectivity with 5 or more carbon atoms is 35.73%.

Embodiment 3

[0079] a CO 2 The method for synthesizing hydrocarbons by hydrogenation is basically the same as in Example 1, except that K-M jointly promotes the preparation step of the Fe-based catalyst.

[0080] The preparation steps of K-M co-promoted Fe-based catalyst are basically the same as in Example 1, the only difference is that the transition metal M precursor is nickel nitrate, and by adjusting the reaction parameters, the content of Fe element and the content of transition metal M in the prepared catalyst And the content of alkali metal K is with embodiment 1.

[0081] CO 2 After the hydrogenation reaction, CO 2 The conversion rate was 40.62%, CH 4 The selectivity is 28.07%, the selectivity of CO is 13.05%, the selectivity of carbon hydrocarbons with 2 to 4 carbon atoms is 43.99%, and the selectivity of carbon hydrocarbons with 5 or more carbon atoms is 27.93%.

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Abstract

The invention relates to a method for synthesizing a carbon hydrocarbon compound through CO2 hydrogenation. A catalyst is adopted, the catalyst is a K-M co-promoted Fe-based catalyst and is composed of carbon black, Fe2O3NGr, transition metal M and alkali metal K, and Fe2O3NGr is nitrogen-doped graphene half-coated Fe2O3 particles. In the K-M co-promoted Fe-based catalyst, the content of the Fe element is 1-40 wt%, the content of the transition metal M is 1-30 wt%, and the content of the alkali metal K is 1-5 wt%. The transition metal M is one or more of palladium, nickel, cobalt, indium and chromium. The alkali metal K is alkali metal potassium. After the CO2 hydrogenation reaction is finished, the conversion rate of CO2 is 22.73 to 40.62 percent, the selectivity of CH4 is 15.26 to 37.12 percent, the selectivity of CO is 13.05 to 89.96 percent, the selectivity of carbon hydrocarbon with the carbon atom number of 2 to 4 is 12.22 to 43.99 percent, and the selectivity of carbon hydrocarbon with the carbon atom number of more than or equal to 5 is 22.64 to 72.51 percent. The method disclosed by the invention is simple, and the problem of low selectivity of high hydrocarbon in the existing method for synthesizing the carbon hydrocarbon compound through CO2 hydrogenation is effectively solved by adopting the K-M to jointly promote the Fe-based catalyst to serve as the catalyst for synthesizing the carbon hydrocarbon compound through CO2 hydrogenation.

Description

technical field [0001] The invention belongs to CO 2 The technical field of catalytic hydrogenation resource utilization, specifically related to a CO 2 A method for the synthesis of hydrocarbons by hydrogenation. Background technique [0002] Greenhouse gas CO 2 Global warming has aroused widespread concern. CO 2 It is an important renewable, non-toxic and abundant carbon source. Catalytic conversion of it into carbon hydrocarbons can realize carbon recycling, solve the crisis of fossil resources, and meet the goals of carbon peaking and carbon neutrality. It is of great significance in the field of environment and energy. However, CO 2 The extreme inertia presents a formidable challenge. [0003] CO 2 There have been some research reports on the hydrogenation of hydrocarbons. Prior art 1 (http: / / dx.doi.org / 10.1016 / j.cattod.2017.09.053) designed and prepared ZnGa 2 o 4 Bifunctional catalyst combined with SAPO-34, low carbon olefin C 2 ~C 4 The proportion in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G2/00C07C1/12C07C9/04C07C11/04C07C11/06C07C11/08B01J27/24
CPCC10G2/50C07C1/12B01J27/24C07C2527/24C07C9/04C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 刘爽熊良敏牛晓达郭凯梁陈淑媛门勇安炜王金果
Owner SHANGHAI UNIV OF ENG SCI
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