Mississippi State University
Schulz, Kirk H.
George, Clifford E.
Hill, Priscilla J.
Date of Degree
Graduate Thesis - Open Access
Master of Science
James Worth Bagley College of Engineering
Dave C. Swalm School of Chemical Engineering
Methanation of CO2, a greenhouse gas component, using bimetallic catalysts is considered. Rh, Pd and Ru were combined separately with Co on silica support to form bimetallic catalysts with 5 % metal loading and atomic ratio to Co equal to 1. Pore volume of the silica was measured using physisorption analysis. The unreduced catalyst samples were characterized using XPS, TPR and SEM-EDS. XPS results showed low Rh, Pd, Ru and Co concentrations at the surface for the three bimetallic catalysts. The oxidation states of metals detected by XPS supported the likely presence of metals in their oxide form. Detection of alloys and/or bimetallic particles on the surface of the catalysts was difficult through the XPS results, but presence of bimetallic particles was confirmed in Ru-Co and Pd-Co catalysts through the TPR results. Surface segregation of cobalt was observed. This was supported and extended to other metals through the SEM-EDS results.
Moorthiyedath, Sajeev, "Surface Characterization of Rh-Co, Ru-Co and Pd-Co Bimetallic Catalysts" (2003). Theses and Dissertations. 4158.