Evaluation of catalytic subcritical water gasification of food waste for hydrogen production: Effect of process conditions and different types of catalyst loading |
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| Affiliation: | 1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Zhejiang Energy Group R&D, Hangzhou, 310007, China;3. Center of Excellence in Environmental Catalysis and Adsorption, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thailand;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Queensland Micro- and Nanotechnology Center, Nathan Campus, Griffith University, Brisbane 4111, Australia;3. School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;4. Centre for Computational Molecular Science, AIBN, The University of Queensland, St Lucia, QLD 4072, Australia;1. Department of Earth and Space Science and Engineering, York University, Ontario M3J 1P3, Canada;2. Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatchewan S7N 5A9, Canada;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, Shaanxi, China;2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD 4072, Australia;3. Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, QLD 4072, Australia;4. School of Natural Sciences and Queensland Micro- and Nanotechnology Center, Nathan Campus, Griffith University, Brisbane 4111, Australia |
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| Abstract: | Food waste is a kind of wet bio-waste which has been a challenge for the ecological environment and disposal. In this paper, hydrogen production from subcritical water gasification (SbWG) of food waste with and without catalyst loading was systematically investigated. The effects of reaction temperature (300–360 °C), residence time (30–90 min), food waste concentration (10–30 wt%) and catalysts (Ni/γ-Al2O3, Ni/ZrO2, NaOH, KOH, and FeCl3) were studied within a pressure range of 10.5–20 MPa. The optimal process condition for SbWG of food waste without catalysts loading was determined to be 360 °C and 90 min with 10 wt% food waste. The liquid products and hydrochar were characterized by TOC, TGA/DTG, and SEM. The TOC concentration of liquid products decreased vastly with increasing reaction temperature. The highest H2 yield (1.88 mol/kg), H2 mole fraction (35.01%), and H2 selectivity (53.86%) were achieved at 360 °C for 90 min with 5 wt% loading of KOH. It can be concluded that the performance of the catalysts for improving hydrogen production in SbWG of food waste was in the following order: KOH > NaOH > Ni/γ-Al2O3 > Ni/ZrO2 > FeCl3. The catalytic SbWG can be a potential alternative for energy conversion of food waste and hydrogen production. |
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| Keywords: | Hydrogen Subcritical water Gasification Food waste Catalysts |
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