Copper Ion-modified Titanium Oxide Catalysts for CO Oxidation in Lean Mixtures
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Journal |
Petroleum Chemistry
ISSN: 0965-5441
, E-ISSN: 1531-8532
|
| Output data |
Year: 1998,
Volume: 38,
Number: 3,
Pages: 170-177
Pages count
: 8
|
| Authors |
Trusova E.A.
1
,
Tsodikov M.V.
1
,
Slivinskii E.V.
1
,
Bukhtenko O.V.
1
,
Zhdanova T.N.
1
,
Ernandes G.G.
1
,
Kochubei D.I.
2
,
Goryunova I.I.
3
|
| Affiliations |
| 1 |
Topchiev Inst. Petrochem. Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 117912, Russian Federation
|
| 2 |
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation
|
| 3 |
Moscow Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936, Russian Federation
|
|
A set of TiO2-base Cu-Ti oxide catalysts, which showed high catalytic activity in low-temperature oxidation of CO in its lean mixtures with air, were prepared by the alkoxide technique using copper stearate and tetrahutoxytitanium as precursors. At an identical copper content in a composition, the anatase-base oxide is greatly superior to that of the rutile base in activity. The optimum copper content in catalysts providing increased activity in CO oxidation is 3-5 wt % and corresponds to the single-phase systems of the general formula CuxTi1-0.5xO2 with the anatase structure. Such systems provide virtually complete oxidation of CO in lean mixtures with air temperature 140°C and space velocity 50000 h-1. The structure of the oxides and charge states of copper were studied by X-ray diffraction, EXAFS, X-ray PES, and magnetic susceptibility techniques. The presence of two types of catalytic oxidation centers, the low-temperature (120-140°C) and the high-temperature (140-200°C) sites, involving Cu(1+) and Cu(2+) ions (bound to oxygen), respectively, is suggested