Method for electrochemical hydrogenation and electric energy symbiosis of water-soluble unsaturated organic acid

A technology of unsaturated organic acids, applied in the field of electrochemical hydrogenation of water-soluble unsaturated organic acids and electric energy symbiosis, can solve the problems of serious energy consumption and harsh reaction conditions, and achieve the effect of simple production process and low pollution

Inactive Publication Date: 2004-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a water-soluble unsaturated organic acid electrochemical hydrogenation and electric energy symbiosis method, which solves the problems of harsh reaction conditions and serious energy consumption in the exist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A typical porous gas diffusion three-in-one membrane electrode is used: the catalyst is 20% Pt / C (Johnson Matthey), and the Pt loading is 0.35-0.5 mg / cm 2 , the solid polymer film was Nafion 117 (Dupont, Fayetteville, PA). After pretreatment, the Nafion membrane and the electrode are cold-pressed and then hot-pressed to form a three-in-one membrane electrode (MEA). Load the proton exchange membrane fuel cell and connect the battery to the test system. Control the battery temperature at 20°C. After the initial polarization, hydrogen gas was introduced, the hydrogen pressure was controlled at 1.5 bar, the peristaltic pump was turned on, and 100 ml of 2 mol / L acrylic acid aqueous solution was pumped into the cathode chamber, and the catholyte flow rate was controlled at 3 ml / min. Response at 10mA / cm 2 for 3 hours.

[0022] The measured open circuit voltage is 0.198V, and the current density is 10mA / cm 2 When the voltage is 0.092V, the current density is 20mA / cm 2 , t...

Embodiment 2

[0024] A typical porous gas diffusion three-in-one membrane electrode is used, loaded into a proton exchange membrane fuel cell, and connected to the test system. Control the battery temperature at 50°C. After the initial polarization, hydrogen was introduced, and the hydrogen pressure was controlled at 1.5 bar. The peristaltic pump was turned on, and 100 ml of 1 mol / L butynedioic acid aqueous solution was pumped into the cathode chamber, and the flow rate of the catholyte was controlled to be 12 ml / min. Response at 6mA / cm 2 for 8 hours.

[0025] The measured open circuit voltage is 0.19V, and the current density is 10mA / cm 2 When the voltage is 0.085V, the current density is 20mA / cm 2 , the voltage is 0.008V. At a current density of 6mA / cm 2 , the amount of the product succinic acid measured after reacting for 8 hours was 1.3 mmol, the conversion rate was 2.6%, and the current efficiency was about 45%.

Embodiment 3

[0027] A typical porous gas diffusion three-in-one membrane electrode is used, loaded into a proton exchange membrane fuel cell, and connected to the test system. Control the battery temperature at 80°C. After the initial polarization, hydrogen gas was introduced, the hydrogen pressure was controlled at 1.5 bar, the peristaltic pump was turned on, and 100 ml of 0.5 mol / L crotonic acid aqueous solution was pumped into the cathode chamber, and the catholyte flow rate was controlled at 24 ml / min. Response at 6mA / cm 2 for 6 hours.

[0028] The measured open circuit voltage is 0.20V, and the current density is 10mA / cm 2 When the voltage is 0.068V, the current density is 20mA / cm 2 , the voltage is 0.030V. At a current density of 6mA / cm 2 , the amount of the product butyric acid measured after reacting for 6 hours was 2.1 mmol, the conversion rate was 4.2%, and the current efficiency was about 56%.

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Abstract

The invention is a water soluble unsaturated organic acid electrochemical hydrogenation and electric energy symbiosis method, inserting a proton exchange film fuel cell in a testing system and controlling the temperature of the cell, using nitrogen gas to pretreat the cathode chamber before cathode reactant pumped in, and then making initial polarization on the cell, that is, after charging H2 in the anode, turning on circuit to make residual O2 fully react in the cathode chamber; at the time of reaction, controlling H2 and organic acid water fluxes, respectively, and by adjusting variable resistor, controlling reacting current and making reaction at a certain current density for 3-8 hours, so as to obtain different purity saturated organic acids. It can generate electric energy at the same time of synthesizing products and has an important significance in producing a few high-quality chemical products.

Description

Technical field: [0001] The invention relates to a water-soluble unsaturated organic acid electrochemical hydrogenation and electric energy symbiosis method, which is an electrochemical synthesis method, using a proton exchange membrane fuel cell as a reactor, within the working range of the proton exchange membrane fuel cell, to carry out water soluble Electrochemical hydrogenation of unsaturated organic acids to synthesize saturated organic acids and generate electricity. It belongs to the field of electrochemical engineering and catalytic technology. Background technique: [0002] A fuel cell is an electrochemical reaction device that directly converts chemical energy into electrical energy through an electrode catalytic reaction process. Among them, the proton exchange membrane fuel cell (PEMFC) has shown good application prospects in electric vehicles and small mobile power sources. At present, while promoting the commercialization of PEMFC, people are also considering...

Claims

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Application Information

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IPC IPC(8): H01M8/04298H01M8/06H01M8/10
CPCY02E60/50
Inventor 马紫峰袁晓姿
Owner SHANGHAI JIAO TONG UNIV
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