La-doped cobalt supported on mesoporous alumina catalysts for improved methane dry reforming and coke mitigation. Issue 4 (August 2020)

• Record Type: Journal Article
• Authors: Tran, Ngoc Thang; Van Le, Quyet; Van Cuong, Nguyen; Nguyen, Trinh Duy; Huy Phuc, Nguyen Huu; Phuong, Pham T.T.; Monir, Minhaj Uddin; Aziz, Azrina Abd; Truong, Quang Duc; Abidin, Sumaiya Zainal; Nanda, Sonil; Vo, Dai-Viet N.
• Is Part Of: Journal of the Energy Institute. Volume 93:Issue 4(2020)
• Page Start: 1571
• Page End: 1580
• Publication Date: 2020-08
• Subjects: Methane dry reforming -- Cobalt catalyst -- La2O3 -- Syngas -- Mesoporous alumina -- Hydrogen; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2020.01.019
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: The promotional La2 O3 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 Co3 O4 nanoparticles were evidently scattered on fibrous mesoporous alumina with small crystal size of 8–10 nm. The promotion behavior of La2 O3 facilitated H2 -reduction by providing higher electron density and enhanced oxygen vacancy in 10%Co/MA. The addition of La2 O3 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 La2 O3 addition was also due to smaller crystallite size, alleviated H2 -reduction and the basic character of La2 O3 . 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 La2 O3 promotion. The variation of H2 /CO ratios within 0.63–0.99 was preferred for downstream generation of long-chain olefinic hydrocarbons. Graphical abstract: Image 1 Highlights: La2 O3 addition increased CH4 and CO2 conversions to 93.7% and 93.2%, respectively. In situ formed La2 O2 CO3 transitional phase mitigated deposited carbon. The degree of oxygen vacancy of catalyst increased to 73.3% with La2 O3 promotion.