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Biochar electrochemical reforming hydrogen production method based on multi-stage utilization of biomass

A technology for reforming hydrogen and biochar, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of electrocatalyst source and cost limitation, slow oxidation rate, etc., achieve high efficiency and low cost hydrogen production, high and low Effect of carbon emission and promotion of oxidation reaction

Active Publication Date: 2021-04-30
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the current low-temperature electrochemical reforming process of solid carbon-based fuels such as coal has a slow oxidation rate and the technical problems of limited sources and costs of electrocatalysts

Method used

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  • Biochar electrochemical reforming hydrogen production method based on multi-stage utilization of biomass
  • Biochar electrochemical reforming hydrogen production method based on multi-stage utilization of biomass
  • Biochar electrochemical reforming hydrogen production method based on multi-stage utilization of biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Pyrolysis and carbonization of rice husk at 600°C to produce pyrolysis biochar, configure H 2 SO 4 Biochar slurry with an electrolyte concentration of 1mol / L and a biochar slurry concentration of 0.01g / mL; the biochar was impregnated with KOH solution and activated by pyrolysis to form porous carbon, and then mixed with H 2 PtCl 6 ·6H 2 O is impregnated and reduced to uniformly load Pt on the surface of porous carbon to form a 20wt% Pt / C electrocatalyst; 2 After hot pressing with carbon paper and Nafion 117 membrane to form a membrane electrode, put it into figure 1 In the proton exchange membrane electrochemical cell; the biochar slurry and water are controlled to circulate between the proton exchange membrane electrochemical cell and the liquid storage tank at a flow rate of 30mL / min; a constant voltage of 1.3V is applied, and the cathode generates H 2 .

Embodiment 2

[0027] Pyrolysis and carbonization of rice husk at 500 °C to produce pyrolysis biochar, configure H 2 SO 4 Biochar slurry with an electrolyte concentration of 1mol / L and a biochar slurry concentration of 0.01g / mL; the biochar was impregnated with KOH solution and activated by pyrolysis to form porous carbon, and then combined with Fe(NO 3 ) 3 9H 2 Fe is evenly loaded on the surface of porous carbon by impregnation and reduction reaction to form a 20wt% Fe / C electrocatalyst; the electrocatalyst is loaded at 0.25mg / cm 2 After hot pressing with carbon paper and Nafion 117 membrane to form a membrane electrode, put it into figure 1 In the proton exchange membrane electrochemical cell; the biochar slurry and water are controlled to circulate between the proton exchange membrane electrochemical cell and the liquid storage tank at a flow rate of 15mL / min; a constant voltage of 1.3V is applied, and the cathode generates H 2 .

Embodiment 3

[0029] Peanut shells are hydrothermally carbonized at 200°C to produce hydrothermal biochar, and a biochar slurry with an HCl electrolyte concentration of 1mol / L and a biochar slurry concentration of 0.01g / mL is prepared; the biochar is impregnated with KOH solution and activated by pyrolysis to form pores char, then with H 2 PtCl 6 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O uniformly supported Pt and Fe on the surface of porous carbon by impregnation reduction reaction to form a 30%wt PtFe / C electrocatalyst; the electrocatalyst was loaded at 1.8mg / cm 2 After hot pressing with carbon paper and Nafion 115 membrane to form a membrane electrode, put it into figure 1 In the proton exchange membrane electrochemical cell; control the biochar slurry and water to circulate between the proton exchange membrane electrochemical cell and the liquid storage tank at a flow rate of 45mL / min; feed a constant current density of 30mA / cm 2 , the cathode produces H 2 .

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Abstract

The invention discloses a biochar electrochemical reforming hydrogen production method based on the multi-stage utilization of biomass, which is characterized in that the biomass is made into biochar as a carbon-based fuel, and at the same time, porous carbon is formed after activation treatment as a carrier load Transition metals or noble metals form metal / porous carbon composite electrocatalysts, and form membrane electrodes with diffusion layers and proton exchange membranes, and put them into electrochemical cells; put biochar slurry and water into liquid storage tanks respectively, and keep the electrolyte in the storage tank. The circulating flow between the liquid tank and the proton exchange membrane electrochemical cell is fed with a constant voltage or current to continuously generate H 2 and CO 2 . The present invention utilizes abundant sources of biomass carbonization to produce biochar with a large specific surface area and high carbon content as a carbon-based fuel. At the same time, biochar is combined with transition metals or noble metals to form a composite metal / porous carbon electrocatalyst to catalyze the conversion of biochar. The synchronous progress of the two promotes the anode biochar oxidation reaction, increases the current density and enhances the stability of the electrical reforming process.

Description

technical field [0001] The invention relates to a biochar electrochemical reforming hydrogen production method based on multi-stage utilization of biomass, which belongs to the technical field of energy clean utilization and hydrogen production. Background technique [0002] In recent years, combining traditional energy with water electrolysis, extensive research and discussions have been carried out around the electrochemical reforming of carbon-based fuels such as coal (referred to as electrical reforming) to produce hydrogen. Carbon-based fuel is used as an anode reactant to replace the oxygen evolution process of the traditional water electrolysis anode, and the cathode maintains the hydrogen evolution process of water. The minimum theoretical potential requirement for oxygen evolution at room temperature is 25°C is 1.23V, while the minimum carbon oxidation potential is 0.21V, which can be significantly reduced The electrochemical reaction breaks down the voltage. Therm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/02C25B1/04C25B9/23C25B11/031C25B11/054C25B11/065C25B11/075C25B11/081C25B11/089
CPCC25B1/02C25B1/04C25B9/73C25B9/23C25B11/031C25B11/051C25B11/073Y02E60/36
Inventor 应芝郑晓园豆斌林崔国民
Owner UNIV OF SHANGHAI FOR SCI & TECH
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