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CAER Seminars


Albert Vannice
Department of Chemical Engineering
Pennsylvania State University

Friday, May 14, 1999 10:00 am
Ben Bandy Conference Center
Center for Applied Energy Research

Cu was dispersed on three different forms of carbon ­ activated carbon, graphitized carbon fibers, and diamond powder ­ and then characterized by CO chemisorption, N2O decomposition, XRD, TEM, TPR and DRIFTS. The two adsorption measurements determined the Cu dispersion and the concentration of Cu+1 and Cu0 surface sites, respectively, and the relative concentrations of surface Cu+2, Cu+1 and Cu0 sites were also measured by DRIFT spectra of CO adsorbed at subambient temperatures. These results and the XRD results are compared after different pretreatments. The catalytic behavior of these catalysts was then determined for crotonaldehyde and furfural hydrogenation and for N2O decomposition and reduction. An optimum hydrogenation activity was observed as the Cu0/Cu0+Cu+1 ratio varied with the maximum occurring at approximately equal Cu0 and Cu+1 site densities. N2O reduction to N2 and CO2 occurred at a lower temperature than N2O decomposition over Cu/ZSM-5 due to the carbon support acting as a reductant.