CO oxidation on substituted copper chromite spinel oxide catalysts

Journal Article · Sun May 01 04:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1127· OSTI ID:7036619

Murthy, K S.R.C. ^[1]; Ghose, J ^[2]

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1. Indian Telephone Industries, Ltd., Banglore (India)
2. Indian Institute of Technology, Kharagpur (India)

Oxidation of carbon monoxide was studied on Mg- and Al-substituted CuCr[sub 2]O[sub 4] spinel catalyst at atmospheric pressure and temperatures between 373 and 723 K. The activity of CuCr[sub 2]O[sub 4] decreased even for small replacements of either Cu by Mg or Cr by Al and none of the substituted oxides was as active as CuCr[sub 2]O[sub 4]. In Cu[sub 1[minus]x]Mg[sub x]Cr[sub 2]O[sub 4] catalysts, the activity systematically decreased with increasing x, except for 0.4 < x < 0.6. The decrease in activity is due to a decrease in the active Cu[sup 2+] ions of the catalyst. The increase in activity on increasing x from 0.4 to 0.6 is attributed to the crystallographic phase change, i.e., tetragonal to cubic, in the catalyst. This was also found in the CuCr[sub 2[minus]x]Al[sub x]O[sub 4] catalysts. The decrease in the catalytic activity on substitution of Cr by Al, even when the total copper content is not altered, is due to the reduction of some of the active Cu[sup 2+] ions to Cu[sup 1+] ions. 10 refs., 9 figs., 2 tabs.

• OSTI ID: 7036619
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 147:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

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400201* -- Chemical &amp; Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
HETEROGENEOUS CATALYSIS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS