Abstract
In this paper, we have shown that Cu/TiO 2 catalysts are highly active in CO oxidation. For instance, a 3.4% Cu/TiO 2 catalyst exhibits a higher turnover rate for the effective removal of CO in air than 3-5% Pt/TiO 2 and 20% Cu/ZnO/Al 2O 3 catalysts. A small amount of Cu + species is formed during the calcination treatment at 225 °C, which is the main active phase for the CO oxidation. However, it is proposed that some highly dispersed CuO can also form in the TiO 2 lattice during the calcination treatment. Furthermore, a strong electron interaction between Cu 2+ in highly dispersed CuO and Ti 3+ on rutile TiO 2 (Cu 2++Ti 3+→ Cu ++Ti 4+) has been shown to occur. Overall, the reduction of Cu + is a major factor that contributes to the reaction rate of the CO oxidation.
Original language | English |
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Pages (from-to) | 9996-10006 |
Number of pages | 11 |
Journal | Langmuir |
Volume | 28 |
Issue number | 26 |
DOIs | |
State | Published - 03 07 2012 |