Ethanol CO2 reforming on La2O3 and CeO2-promoted Cu/Al2O3 catalysts for enhanced hydrogen production

Mohd-Nasir Nor Shafiqah, Hai Nguyen Tran, Trinh Duy Nguyen, Pham T. T. Phuong, Bawadi Abdullah, Su Shiung Lam, Phuong Nguyen-Tri, Ravinder Kumar, Sonil Nanda, Dai Viet N. Vo*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    [Graphic abstract]


    3%Ce- and 3%La-promoted 10%Cu/Al2O3 catalysts were synthesized via a sequential incipient wetness impregnation approach and implemented for ethanol CO2 reforming (ECR) at 948–1023 K and stoichiometric feed ratio. CeO2 and La2O3 promoters reduced CuO crystallite size from 32.4 to 27.4 nm due to diluting impact and enhanced the degree of reduction of CuO → Cu0. Irrespective of reaction temperature, 3%La–10%Cu/Al2O3 exhibited the highest reactant conversions, H2 and CO yields followed by 3%Ce–10%Cu/Al2O3 and 10%Cu/Al2O3. The greatest C2H5OH and CO2 conversions of 87.6% and 55.1%, respectively were observed on 3%La–10%Cu/Al2O3 at 1023 K whereas for all catalysts, H2/CO ratios varying from 1.46 to 1.91 were preferred as feedstocks for Fischer-Tropsch synthesis. Activation energy for C2H5OH consumption was also reduced with promoter addition from 53.29 to 47.05 kJ mol−1. The thorough CuO → Cu0 reduction by H2 activation was evident and the Cu0 active phase was resistant to re-oxidation during ECR for all samples. Promoters addition reduced considerably the total carbon deposition from 40.04% to 27.55% and greatly suppressed non-active graphite formation from 26.94% to 4.20% because of their basic character and cycling redox enhancement.

    Original languageEnglish
    Pages (from-to)18398-18410
    Number of pages13
    JournalInternational Journal of Hydrogen Energy
    Volume45
    Issue number36
    DOIs
    Publication statusPublished - 17 Jul 2020

    Keywords

    • Ethanol CO₂ reforming
    • CeO₂
    • La₂O₃
    • Cu-based catalysts
    • Syngas
    • Hydrogen

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