Pd-Cu supported on TiO2-CeO2 mixed oxides (Pd-Cu/TiO2-CeO2) were tested for the reduction of nitrate ions in water. Compared with a Pd-Cu catalyst with TiO2 only as support (Pd-Cu/TiO2), which was proved to be active for this reaction in our previous study, Pd-Cu/TiO2-CeO2 showed improved activity if TiO2-CeO2 contained an appropriate amount of ceria (Ti:Ce = 18:1). Especially, the Pd-Cu/TiO2-CeO2 (Ti:Ce = 18:1) showed the initial nitrate reduction rate of 3.20 mmol/min/g cat, eight times higher than that of Pd-Cu/TiO2 (0.41 mmol/min/gcat). It was supposed that the improved activity of the catalyst was attributable to the reduced surface (oxygen vacancies) of the support and zero-valence states of the active metals (including the Pd-Cu alloy) in the catalyst.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Process Chemistry and Technology