Abstract
Various characteristics of CoPc supported on Al2O3, SiO2 and SiO2-Al2O3 ofvarying SiO2 mole ratio were investigated. Different pore systems were found to exist depending on the support permitting entrance of CoPc molecules (SiO2 and silica-rich samples) or not (Al2O3 and alumina-rich samples). The major fraction of CoPc appeared as combined with the support surface was much less in silica and silica-rich samples. From chemisorption stoichiometries, CoPc molecules are proposed to lie flat on alumina and alumina-rich surfaces and inclined-edge oriented on silica and silica-rich surfaces. The studied catalysts exhibited good selectivities in the oxidative dehydrogenation of cyclohexene toward benzene. A mechanisms was suggested where the formation of an intermediate involving active oxygen species was considered the rate determining step.
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