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Screening of Nickel and Platinum Catalysts for Glycerol Conversion to Gas Products in Hydrothermal Media

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  • Carine T. Alves

    (Energy and Bioproducts Research Institute, School of Infrastructure and Sustainable Engineering, College of Engineering and Physical Sciences, Aston University, Birmingham B4 7ET, UK
    Energy Engineering Department, Universidade Federal do Reconcavo da Bahia, Av. Centenario 697, Feira de Santana 44085-132, Brazil)

  • Jude A. Onwudili

    (Energy and Bioproducts Research Institute, School of Infrastructure and Sustainable Engineering, College of Engineering and Physical Sciences, Aston University, Birmingham B4 7ET, UK)

Abstract

The production of low-carbon gaseous fuels from biomass has the potential to reduce greenhouse gas emissions and promote energy sustainability, stability and affordability around the world. Glycerol, a large-volume by-product of biodiesel production, is a potential feedstock for the production of low-carbon energy vectors. In this present work, an aqueous solution of pure glycerol was reacted under hydrothermal conditions using a total of 10 types of heterogeneous catalysts to evaluate its conversion to gas products (hydrogen, methane, CO, CO 2 and C 2 –C 4 hydrocarbon gases). Two bimetallic Ni-Fe and Ni-Cu catalysts, three Pt-based catalysts and physical mixtures of the five catalysts were tested. The reactions were carried out in a batch reactor for 1 h reaction time, using a 9:1 mass ratio of water/glycerol (10 wt%) and the reaction temperatures ranged between 250–350 °C using and without using 1 g of catalyst. The effects of the catalysts and reaction conditions on the conversion of glycerol in terms of carbon and hydrogen gasification efficiencies, selectivity and yields of components in the gas products were investigated. CO 2 remained the most dominant gas product in all experiments. The results indicated that increasing the reaction temperature favoured gas formation and both carbon and hydrogen gasification efficiencies. The combination of Ni-Cu and Pt/C catalysts was the most selective catalyst for gas formation at 350 °C, giving carbon gasification efficiency of 95.6 wt%. Individually, the catalyst with the highest hydrogen production was Pt/C and the highest propane yield was obtained with the Ni-Cu bimetallic catalyst. Some catalysts showed good structural stability in hydrothermal media but need improvements towards better yields of desired fuel gases.

Suggested Citation

  • Carine T. Alves & Jude A. Onwudili, 2022. "Screening of Nickel and Platinum Catalysts for Glycerol Conversion to Gas Products in Hydrothermal Media," Energies, MDPI, vol. 15(20), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7571-:d:941681
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    References listed on IDEAS

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    1. Yang, Tai & Wang, Peng & Li, Qiang & Xia, Chaoqun & Yin, Fuxing & Liang, Chunyong & Zhang, Yanghuan, 2018. "Hydrogen absorption and desorption behavior of Ni catalyzed Mg–Y–C–Ni nanocomposites," Energy, Elsevier, vol. 165(PA), pages 709-719.
    2. A. P. Ballantyne & C. B. Alden & J. B. Miller & P. P. Tans & J. W. C. White, 2012. "Increase in observed net carbon dioxide uptake by land and oceans during the past 50 years," Nature, Nature, vol. 488(7409), pages 70-72, August.
    3. Iram Razaq & Keith E. Simons & Jude A. Onwudili, 2021. "Parametric Study of Pt/C-Catalysed Hydrothermal Decarboxylation of Butyric Acid as a Potential Route for Biopropane Production," Energies, MDPI, vol. 14(11), pages 1-15, June.
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