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Method for restoring carbon dioxide to produce methane and acetic acid by utilizing biological electrochemical system

A technology of bioelectrochemistry and carbon dioxide, applied in the direction of products, educts, waste fuels, etc., can solve the problems of high cost, complicated operating conditions, and the need for precious metal catalysts, etc., and achieve the effect of low cost

Inactive Publication Date: 2013-02-13
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the disadvantages of complex operating conditions, high energy consumption, need for noble metal catalysts and high cost in the prior art

Method used

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  • Method for restoring carbon dioxide to produce methane and acetic acid by utilizing biological electrochemical system
  • Method for restoring carbon dioxide to produce methane and acetic acid by utilizing biological electrochemical system
  • Method for restoring carbon dioxide to produce methane and acetic acid by utilizing biological electrochemical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Methane production and acetic acid performance of mixed flora.

[0029] (1) Construction of bioelectrochemical reaction device

[0030] The bioelectrochemical device is a dual-chamber reactor configuration ( figure 1 ), including potentiostat 4, circulating pump 5, gas storage bag 6, cathode chamber 1 and anode chamber 2. A working electrode and a reference electrode are inserted in the cathode chamber 1, and an auxiliary electrode is inserted in the anode chamber 2. The working electrode and the auxiliary electrode are made of carbon felt (7.0cm×7.0cm). The two chambers are separated by a cation exchange membrane 3.

[0031] (2) Preparation of cathode compartment solution and anode compartment solution

[0032] Anodic solution: 0.1mol / L phosphate buffer solution (pH 6.0)

[0033] The composition of the catholyte compartment liquid is as follows:

[0034] K 2 HPO 4 ·3H 2 O 3.0096g·L -1 ,KH 2 PO 4 11.8048g·L -1 ,NaHCO 3 6.0g·L -1 , NaCl 1g·L -1 ,NH 4 Cl 1.0g·L -1 ,CaC...

Embodiment 2

[0042] Example 2: Different cathodic polarization potentials regulate the metabolites of mixed flora

[0043] After the biocathode was successfully prepared, set the cathode polarization potential from -850mV to -1100mV (vs.Ag / AgCl), and quantitatively analyze the production of hydrogen, methane and acetic acid. The test results are shown in Table 2:

[0044] Table 2 Generation rate of hydrogen, methane and acetic acid under different electric potentials

[0045]

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Abstract

The invention provides a method for restoring carbon dioxide to produce methane and acetic acid by utilizing a biological electrochemical system and regulating and controlling microorganism metabolites by utilizing cathodic polarization potential. A bio-cathode is prepared in the biological electrochemical system, carbon dioxide (CO2) is fed into a cathode chamber and an anode chamber to circularly aerate, the cathodic polarization potential is set from -850mV to -1150mV (vs.Ag / AgCl), and microorganism on a cathode can directly obtain electrons from electrodes or from hydrogen produced by the electrodes to restore the carbon dioxide and produce the methane and the acetic acid. The methane and the acetic acid which are microbial synthesis products can be regulated and controlled by setting different cathodic polarization potentials. The electrodes do not need to use expensive catalyst, and are low in cost. The method for restoring the carbon dioxide to produce the methane and the acetic acid by utilizing the biological electrochemical system is rapid in production rate of the methane and the acetic by restoring the carbon dioxide, and has important application prospect for fixedly converting the carbon dioxide and synthetizing organic chemicals.

Description

technical field [0001] The invention relates to bioelectrochemical reduction of carbon dioxide, which belongs to the technical field of resource utilization of carbon dioxide, and specifically relates to a method for producing methane and acetic acid by reducing carbon dioxide with a bioelectrochemical system, and regulating microbial metabolites by using cathode polarization potential. Background technique [0002] Climate warming has become a global climate problem, and carbon dioxide is the most important greenhouse gas in the world. With the growth of population, the development of modern industry and transportation, the emission of carbon dioxide continues to increase. Among them, the emission of pollutants from electricity production and coal combustion, which use fossil fuels as the main energy source, has always been the focus of attention in environmental protection. Carbon dioxide emission reduction has become a global topic and research hotspot. [0003] The deep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12P7/54
CPCY02E50/343Y02E50/30Y02P20/141
Inventor 李大平蒋永何晓红陶勇
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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