Effect of Ti3+ on TiO2-supported Cu catalysts used for CO oxidation.
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(2)O(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.
Center for General Education, Chang Gung University, Kwei-Shan Tao-Yuan, Taiwan, Republic of China. cschen@mail.cgu.edu.tw
Ching S
CS
Chen
Tse C
TC
Chen
Chen C
CC
Chen
Yuan T
YT
Lai
Jiann H
JH
You
Te M
TM
Chou
Ching H
CH
Chen
Jyh-Fu
JF
Lee
D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D013057:Spectrum Analysis; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
C009495:titanium dioxide; D003300:Copper; D002248:Carbon Monoxide; D006859:Hydrogen; D014025:Titanium