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Method for synthesizing olefin by electro-catalyzing semi-hydrogenated gas-phase alkyne

A hydrogenation gas, electrocatalysis technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of low current density and alkyne conversion rate, not receiving attention from researchers, and achieve the improvement of current density and alkynes. Conversion, effect of excellent olefin selectivity

Pending Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above studies have shown that electrocatalytic selective reduction of alkynes to alkenes is feasible, but limited by the weak mass transfer and diffusion capabilities of alkynes in the electrolyte, the current density and conversion of alkynes in the currently reported methods are extremely low, which is different from that of Compared with thermal catalytic technology, there is a huge disadvantage, and it has not received the attention of relevant researchers

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  • Method for synthesizing olefin by electro-catalyzing semi-hydrogenated gas-phase alkyne
  • Method for synthesizing olefin by electro-catalyzing semi-hydrogenated gas-phase alkyne

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Effect test

Embodiment 1

[0055] (1) The gas diffusion electrode made of Fe nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 1M KOH solution, and an anion is used between exchange membrane isolation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0056] (2) Use a gas mass flowmeter to control the flow rate of the acetylene reaction gas to 50 sccm.

[0057] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0058] (4) The catalytic activity of Fe nanoparticles was characterized by potentiostatic method.

[0059] The catalyst composition and specific evaluation results are shown in Table 1.

Embodiment 2

[0061] (1) The gas diffusion electrode made of Co nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 1M KOH solution, and anion is used between exchange membrane isolation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0062] (2) Use a gas mass flowmeter to control the flow rate of the acetylene reaction gas to 50 sccm.

[0063] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0064] (4) The catalytic activity of Co nanoparticles was characterized by potentiostatic method.

[0065] The catalyst composition and specific evaluation results are shown in Table 1.

Embodiment 3

[0067] (1) The gas diffusion electrode made of Ni nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 1M KOH solution, and an anion is used between exchange membrane isolation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0068] (2) Use a gas mass flowmeter to control the flow rate of the acetylene reaction gas to 50 sccm.

[0069] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0070] (4) The catalytic activity of Ni nanoparticles was characterized by potentiostatic method.

[0071] The catalyst composition and specific evaluation results are shown in Table 1.

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Abstract

The invention relates to a method for synthesizing olefin by electro-catalyzing semi-hydrogenated gas-phase alkyne. The method comprises the following steps of: spraying a catalyst onto a gas diffusion layer substrate (comprising conductive carbon paper, metal and the like) by using a gas diffusion electrode, isolating a cathode from an anode by using an ion exchange membrane, and adopting a three-electrode or two-electrode system constant-voltage method to carry out electrochemical performance test, wherein the reaction gas is high-purity alkyne. According to the invention, the experimental results show that the method can be used for efficiently and selectively reducing the gas-phase alkyne into the corresponding olefin; compared with an H-type electrolytic tank, after the gas diffusionelectrode is used, the reaction current density is multiplied, the reaction voltage and the reaction current can reach 1 Acm<-2> or above by regulating and controlling the reaction voltage, and the Faraday efficiency of a target olefin product is remarkably improved and reaches 95% or above; and compared with the traditional thermal catalysis technology, the method can selectively reduce the gas-phase alkyne into olefin at normal temperature and normal pressure without hydrogen consumption, can greatly reduce the energy consumption in the process, better meets the requirements of green chemical industry, and has great strategic significance.

Description

technical field [0001] The invention belongs to a method for electrocatalytic hydrogenation of materials containing carbon-carbon triple bond hydrocarbons, and relates to a method for electrocatalytic semihydrogenation of gas-phase alkynes to synthesize alkenes, in particular to the electrocatalytic selection of gas-phase alkynes such as acetylene, propyne and butyne Sexual hydrogenation. The method utilizes a gas diffusion electrode, improves the reaction current density and the Faradaic efficiency of the target product, and has great application prospects. Background technique [0002] Olefin is an important basic raw material in organic synthesis and can be used to make polyolefin and synthetic rubber. At present, the production of olefins such as ethylene or propylene is mainly completed by catalytic cracking of crude oil (naphtha), but petroleum resources are gradually scarce, and the cost of producing ethylene from naphtha cracking is increasing, which leads to huge c...

Claims

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Application Information

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IPC IPC(8): C25B3/03C25B3/25C25B11/032C25B11/075
Inventor 张健卜军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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