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    Effect of CoMo metal loading on H2 and CNTs production from biogas by integrative process
    (2022-12-19)
    Aieamsam-Aung, Pichawee
    ;
    Nantapong, Paveenuch
    ;
    Rattanaamonkulchai, Raminda
    ;
    Kludpantanapan, Thunyathon
    ;
    Srifa, Atthapon
    Effect of CoMo metal loading to MgO (1, 5, 30 and 50 wt%) on conversion of biogas by an integrative process was investigated at 900 °C under atmospheric pressure. The integrative process combines the direct methanation of CO<inf>2</inf> in biogas and the CH<inf>4</inf> decomposition to upgrade biogas to CH<inf>4</inf> and decompose to hydrogen and carbon nanotubes. Methane dissociative reaction is governed by the concentration of active metals on the catalyst surface, while DRM reaction is suppressed. The 30 wt%CoMo catalyst shows the optimal loading for production of high-purity H<inf>2</inf> (>90v/v%) and high yield of MWCNTs (2.33 gCNT/gCat-h) with 100%CO<inf>2</inf> conversion and 95%CH<inf>4</inf> conversion. Meanwhile, 1 wt%CoMo catalyst provided the single-walled CNTs with diameter of 2.5 nm, high surface area of 165 m<sup>2</sup>/g and high graphitization of I<inf>G</inf>/I<inf>D</inf> = 6.14.
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    Direct Synthesis of Liquefied Petroleum Gas from Carbon Dioxide Using a Copper/Zinc Oxide/Zirconia/Alumina and HY Zeolite Hybrid Catalyst
    (2021-07-27)
    Natakaranakul, Jaru
    ;
    Thongkam, Montree
    ;
    Li, Hangjie
    ;
    Suchamalawong, Phorndranrat
    ;
    Tsubaki, Noritatsu
    Conversion of CO<inf>2</inf> to lower hydrocarbons (HCs) is a high potential process that could reduce and sustainably control this greenhouse gas. In accord with The Sustainable Development Goal from The United Nation Development Program, liquefied petroleum gas (LPG) is viewed as environmentally friendly and is widely used. Small HCs can be directly synthesized from CO<inf>2</inf> hydrogenation over a hybrid catalyst. The main purpose of this study was to investigate the direct synthesis of LPG from CO<inf>2</inf> hydrogenation using a copper/zinc oxide/zirconium/alumina (CZZA) mixed metal and HY zeolite as a hybrid catalyst. The study was conducted in a fixed bed reactor using hydrogen/CO<inf>2</inf>/carbon monoxide as the reactant gas and evaluating four types of production condition, method of catalyst combination, reaction temperature, CZZA/HY zeolite mass ratio, and catalyst weight/volume flow rate. The mixing type between the CZZA and HY zeolite catalysts markedly influenced the HC selectivity with strong suppression of reverse water gas shift reaction. At the optimum condition, a 27.39 % CO<inf>2</inf> conversion level and a high HC (98.70 %) and LPG (66.56 %) selectivity were obtained.
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