Green hydrogen from bio-ethanol reforming using micro plasma
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Green hydrogen from bio‑ethanol reforming using micro plasma ZiKe Qiu1 · XianGe Wei1 · JianMin Mo1 · JiaMin Ding2 · ChangMing Du1,2 Received: 1 April 2020 / Revised: 26 August 2020 / Accepted: 9 September 2020 / Published online: 24 November 2020 © Zhejiang University Press 2020
Abstract Hydrogen is a kind of energy source with a characteristic of high calorific value and plasma is regarded as a good method of hydrogen production. Hydrogen produced from ethanol reforming using micro plasma can be utilized for portable applications. The study introduces water/carbon ratio, residence time, and ethanol mass flow rate as the parameters of experimental conditions, and makes ethanol conversion, gas production rate, gas product selectivity, energy consumption, and efficiency of hydrogen production per unit as the evaluation parameters of ethanol reforming reaction. The experimental results showed that (1) in the argon micro plasma: the maximum ethanol conversion of 25.3% was obtained at residence time = 2.1 ms, ethanol mass flow rate = 0.01 g/s and S/C = 1.0, and the peak value of hydrogen production of 18.7 μmol/s was achieved at residence time = 2.1 ms, ethanol mass flow rate = 0.05 g/s and S/C = 1.0; (2) in the air micro plasma: the maximum ethanol conversion of 37.4% was obtained at residence time = 2.1 ms, ethanol mass flow rate = 0.01 g/s and S/C = 1.0, and the peak value of hydrogen production of 36.8 μmol/s was achieved at residence time = 2.1 ms, ethanol mass flow rate = 0.03 g/s and S/C = 3.0. These experimental results showed that the microreactor can substantially reduce the volume of the device while producing a large amount of output. Keywords Plasma · Micro plasma · Ethanol · Hydrogen production · Steam reforming
Introduction With the development of industrialization, the demand for fossil fuels is growing worldwide. Hydrogen, as an energy source, has a characteristic of high calorific value. The calorific value of hydrogen is 1.4 × 105 kJ/kg, which is three times of gasoline, 3.9 times of alcohol, 4.5 times of coke [1]. Therefore, hydrogen can be used to produce energy to reduce the need of fossil fuels. Hydrogen can be made from alcohols, heavy oils, natural gas, and many other raw materials. Hydrogen production from alcohols has the following advantages [2]: (1) renewability, (2) high power density, (3) high energy density, (4) easy to store. Hydrogen-rich gas produced from biofuel can * XianGe Wei [email protected] * ChangMing Du [email protected] 1
School of Environmental Science and Engineering, Sun YatSen University, Guangzhou, Guangdong, China
Taizhou Institute of Zhejiang University, Taizhou, Zhejiang, China
2
be directly used in fuel cells. Therefore, the utilization of alcohols in fuel cell technology has broad market prospects [3]. According to the reforming process, the reforming methods of alcohols can be classified as catalysis method [4–6], plasma method [7, 8], and plasma catalysis [9]. Because of its high energy density, high temperature characteristics, hig
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