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Full-Text Articles in Physical Sciences and Mathematics
Co Oxidation Over Au/Tio2 Catalyst: Pretreatment Effects, Catalyst Deactivation, And Carbonates Production, Johnny Saavedra, Camilah Powell, Basu Panthi, Christopher Pursell, Bert Chandler
Co Oxidation Over Au/Tio2 Catalyst: Pretreatment Effects, Catalyst Deactivation, And Carbonates Production, Johnny Saavedra, Camilah Powell, Basu Panthi, Christopher Pursell, Bert Chandler
Bert D Chandler
A commercially available Au/TiO2 catalyst was subjected to a variety of thermal treatments in order to understand how variations in catalyst pretreatment procedures might affect CO oxidation catalysis. Catalytic activity was found to be inversely correlated to the temperature of the pretreatment. Infrared spectroscopy of adsorbed CO experiments, followed by a Temkin analysis of the data, indicated that the thermal treatments caused essentially no changes to the electronics of the Au particles; this, and a series of catalysis control experiments, and previous transmission electron microscopy (TEM) studies ruled out particle growth as a contributing factor to the activity loss. …
Nabr Poisoning Of Au/Tio2 Catalysts: Effects On Kinetics, Poisoning Mechanism, And Estimation Of The Number Of Catalytic Active Sites, Bert Chandler, Shane Kendell, Hieu Doan, Rachel Korkosz, Lars Grabow, Christopher Pursell
Nabr Poisoning Of Au/Tio2 Catalysts: Effects On Kinetics, Poisoning Mechanism, And Estimation Of The Number Of Catalytic Active Sites, Bert Chandler, Shane Kendell, Hieu Doan, Rachel Korkosz, Lars Grabow, Christopher Pursell
Bert D Chandler
Sodium bromide was used to intentionally poison a commercial Au/TiO2 catalyst with the goals of understanding the nature of halide poisoning and evaluating the number and nature of the catalytic active sites. A series of eight poisoned catalysts were prepared by impregnating the parent catalyst with methanolic solutions of NaBr. Each catalyst was tested with CO oxidation catalysis under differential reactor conditions; O2 reaction orders and Arrhenius activation energies were determined for each material. All of the kinetic data, including a Michaelis−Menten analysis, indicated that the primary effect of adding NaBr was to reduce the number of catalytically active sites. …