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Surface and catalytic properties of CuO and Co3O4 solids as influenced by treatment with Co2+ and Cu2+ species by Nagi R.E Radwan; Mohamed Mokhtar; Gamil A El-Shobaky is a Materials Science article available to read on EtoBox.

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The effects of treatment CuO and Co 3 O 4 solids with Co 2+ and Cu 2+ ions on their surface and catalytic properties were investigated using nitrogen adsorption at -196 • C, the oxidation of CO by O 2 at 100-250 • C and the decomposition of H 2 O 2 at 30-50 • C. Pure and doped CuO and Co 3 O 4 solids were subjected to heat treatment at 300-700 • C and the dopant concentration was varied between 1.0 and 7.5 mol%. The results obtained revealed that the doping process of the investigated solids increased the degree of crystallinity and particle size of CuO and Co 3 O 4 phases. This treatment led also to a progressive decrease in the specific surface areas (S BET ) of the treated adsorbents to an extent proportional to the amount of dopants added. However, doping of Co 3 O 4 and CuO solids with small amounts of Cu 2+ and Co 2+ ions, respectively, much increased their catalytic activities in H 2 O 2 decomposition. On the other hand, the doping process brought about both increase and decrease in their catalytic activities towards CO oxidation by O 2 depending on both the nature of the treated solids and that of dopant ions and the calcination temperature. Also, the doping process did not

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Author

Nagi R.E Radwan; Mohamed Mokhtar; Gamil A El-Shobaky

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-860X)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)