Dry reforming of methane over Pt/PrCeZrO catalyst: Kinetic and mechanistic features by transient studies and their modeling
作者： V.A. Sadykov , E.L. Gubanova , N.N. Sazonova , S.A. Pokrovskaya , N.A. Chumakova
DOI: 10.1016/J.CATTOD.2011.04.004
关键词: Catalysis 、 Methane 、 Dissociation (chemistry) 、 Oxygen 、 Carbon dioxide reforming 、 Oxide 、 Cationic polymerization 、 Chemistry 、 Water-gas shift reaction 、 Inorganic chemistry
摘要: Abstract The effect of pretreatment and Pt content on the catalytic properties as well mechanistic features DR were investigated for structured catalysts comprised supported CeO2–ZrO2 oxide doped by Pr. Progressive reduction cationic species reaction feed lowers activity in CH4 dry reforming while accelerating reverse water gas shift catalyzed only Pt0, which then decreases progressively H2/CO ratio effluent. This process is counteracted mobility surface oxygen supplying atoms to reduced centers thus ensuring their reoxidation generating parallel vacancies dissociation CO2. A mathematical model software developed numerically studying transients complex reactions. processing experimental data was fulfilled taking into account importance forms Pt, reactivity carbonate complexes coordinated these cations surface/bulk diffusion. quantitative evaluation density catalyst's active sites coverage reactive accomplished rates both lattice diffusion main stages estimated.
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