title: The role of metal-support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh-Fe catalysts.
abstract: Rh-Fe catalysts supported on Ca-Al2O3, MgO and ZrO2were evaluated in ethanol steam reforming at 623 K and compared to Rh catalysts on the same supports without iron promotion. The metal-support interaction among the three entities, i.e. Rh ↔ Fe2O3← support (ZrO2, MgO and Ca-Al2O3) was investigated using H2-chemisorption, TEM, XPS and in situ techniques such as DRIFTS, temperature-resolved XRD and XAS. As compared to the unpromoted Rh catalysts on the same supports, the CO selectivity is depressed in the presence of iron on Rh/MgO and Rh/Ca-Al2O3, the latter being significantly superior. The role of metal-support interaction for CO-free hydrogen generation was unravelled using a combination of techniques. It was found that the reducibility of iron oxide determines the extent of the strong metal support interaction between Rh and Fe2O3and the reducibility of iron oxide was affected by the support. On Rh-Fe/Ca-Al2O3, a good balance of the interaction between Rh, Fe2O3and Ca-Al2O3prevents strong metal support interaction between Rh and Fe2O3and thus promotes CO elimination via water-gas-shift reaction on Rh-FexOysites.
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg and Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
authors.forename: Catherine K S
authors.initials: CK
authors.lastname: Choong
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: Luwei
authors.initials: L
authors.lastname: Chen
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Du
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: Martin
authors.initials: M
authors.lastname: Schreyer
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: S W
authors.initials: SW
authors.lastname: Daniel Ong
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: Chee Kok
authors.identifier: http://orcid.org/0000-0002-3175-8493
authors.initials: CK
authors.lastname: Poh
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
authors.forename: Liang
authors.initials: L
authors.lastname: Hong
authors.affiliation: Institute of Chemical and Engineering Sciences, Agency for Science, Technology, and Research (A*STAR), 1 Pesek Rd., Jurong Island, Singapore 627833, Singapore. chen_luwei@ices.a-star.edu.sg armando_borgna@ices.a-star.edu.sg.
authors.forename: Armando
authors.initials: A
authors.lastname: Borgna