Titania-supported cobalt and nickel bimetallic catalysts for carbon dioxide reforming of methane

• Published in: Journal of catalysis Vol. 232; no. 2; pp. 268 - 275
• Main Authors: Takanabe, Kazuhiro, Nagaoka, Katsutoshi, Nariai, Kentaro, Aika, Ken-ichi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 10.06.2005; Elsevier; Elsevier BV
• Subjects: Alloy; Bimetal; Catalysis; Chemistry; CO 2 reforming; Cobalt; Exact sciences and technology; General and physical chemistry; Methane; Nickel; Strong resistance to coking; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titania; Methane; Strong resistance to coking; Bimetal; Nickel; Titania; Cobalt; Alloy; CO 2 reforming; Mixed catalyst; Coking; Support; Alloys; Carbon dioxide; Transition element compounds; Transition metal; Reforming; Heterogeneous catalysis; CO2 reforming; Titanium oxide
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2005.03.011

Titania-supported cobalt and nickel bimetallic catalysts were investigated for CO 2 reforming of methane to synthesis gas at 1023 K under ambient pressure. Bimetallic Co–Ni/TiO 2 catalysts with an appropriate Co/Ni ratio showed highly stable activities without carbon deposition. Whereas the monometallic Co/TiO 2 catalyst deactivated rapidly because of the oxidation of metal, 10 mol% substitution of nickel for cobalt suppressed the oxidation of metal, providing a high catalytic stability. However, the catalysts with excess nickel content (>80 mol%) underwent carbon formation. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses revealed that a homogeneous alloy of cobalt and nickel was formed from bulk to the surface by the H 2 reduction, and the alloy was stable during reforming. The advantages of the bimetallic catalysts are high resistance to undesirable metal oxidation and coking, through the control of reactions between CH 4 and CO 2.