La-doped cobalt supported on mesoporous alumina catalysts for improved methane dry reforming and coke mitigation

Ngoc Thang Tran, Quyet Van Le, Nguyen Van Cuong, Trinh Duy Nguyen, Nguyen Huu Huy Phuc, Pham T.T. Phuong, Minhaj Uddin Monir, Azrina Abd Aziz, Quang Duc Truong, Sumaiya Zainal Abidin, Sonil Nanda, Dai Viet N. Vo

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The promotional La2O3 effect on the physicochemical features of mesoporous alumina (MA) supported cobalt catalyst and its catalytic performance for methane dry reforming (MDR) was examined at varied temperature and stoichiometry feedstock. The Co3O4 nanoparticles were evidently scattered on fibrous mesoporous alumina with small crystal size of 8–10 nm. The promotion behavior of La2O3 facilitated H2-reduction by providing higher electron density and enhanced oxygen vacancy in 10%Co/MA. The addition of La2O3 could reduce the apparent activation energy of CH4 consumption; hence, increasing CH4 conversion up to 93.7% at 1073 K. The enhancement of catalytic activity with La2O3 addition was also due to smaller crystallite size, alleviated H2-reduction and the basic character of La2O3. Lanthanum dioxycarbonate transitional phase formed in situ during MDR was accountable for mitigating deposited carbon via redox cycle for 17–30% relying on reaction temperature. Additionally, the oxygen vacancy degree increased to 73.3% with La2O3 promotion. The variation of H2/CO ratios within 0.63–0.99 was preferred for downstream generation of long-chain olefinic hydrocarbons.

    Original languageEnglish
    Pages (from-to)1571-1580
    Number of pages10
    JournalJournal of the Energy Institute
    Volume93
    Issue number4
    DOIs
    Publication statusPublished - 2020 Aug

    Keywords

    • Cobalt catalyst
    • Hydrogen
    • LaO
    • Mesoporous alumina
    • Methane dry reforming
    • Syngas

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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