Deactivation of nanosize gold supported on zirconia in CO oxidation
P Konova, A Naydenov, T Tabakova… - Catalysis …, 2004 - Elsevier
Catalysis Communications, 2004•Elsevier
An Au/ZrO2 catalyst containing nanosize gold was investigated with respect to its activity in
CO oxidation. The high initial activity observed at temperatures down to 230 K was followed
by a gradual decrease. Two main reasons for the catalyst deactivation were found:(i)
adsorption of CO and its accumulation as carbonates, this deactivation being reversible and
after heating the catalyst surface being restored by CO2 evolution,(ii) agglomeration of Au
particles, which causes irreversible however weak deactivation. IR, XPS and TPD data were …
CO oxidation. The high initial activity observed at temperatures down to 230 K was followed
by a gradual decrease. Two main reasons for the catalyst deactivation were found:(i)
adsorption of CO and its accumulation as carbonates, this deactivation being reversible and
after heating the catalyst surface being restored by CO2 evolution,(ii) agglomeration of Au
particles, which causes irreversible however weak deactivation. IR, XPS and TPD data were …
An Au/ZrO2 catalyst containing nanosize gold was investigated with respect to its activity in CO oxidation. The high initial activity observed at temperatures down to 230 K was followed by a gradual decrease. Two main reasons for the catalyst deactivation were found: (i) adsorption of CO and its accumulation as carbonates, this deactivation being reversible and after heating the catalyst surface being restored by CO2 evolution, (ii) agglomeration of Au particles, which causes irreversible however weak deactivation. IR, XPS and TPD data were provided in support of a probable model of CO oxidation and deactivation on Au/ZrO2 catalyst.
Elsevier
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