Interaction of platinum colloids with single crystalline oxide and graphite substrates: a combined AFM,STM and XPS study |
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Authors: | G Witek M Noeske G Mestl Sh Shaikhutdinov R J Behm |
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Affiliation: | (1) Dipartimento di Chimica Industriale ed Ingegneria Chimica G. Natta, Politecnico di Milano, P. zza L. da Vinci 32, 20133 Milan, Italy;(2) Centro Ricerche Ambiente e Materiali, ENEL-DSR, Via Monfalcone 15, 20132 Milan, Italy |
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Abstract: | The reactivity of ternary V2O5-WO3/TiO2 De-NO
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catalysts is investigated by transient and steady-state techniques, and results have been compared with those obtained over binary V2O5/TIO2 samples having the same V2O5 loading. The results indicate that the reactivity of the ternary catalysts in the SCR reaction is higher than that of the vanadia-titania samples, and that at low temperatures the SCR reaction occurs via a redox mechanism that involves at first the participation of the catalyst lattice oxygen and then the reoxidation of the reduced sites by gas-phase oxygen. Accordingly, the higher reactivity of the ternary catalysts has been related to their superior redox properties. |
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Keywords: | NOx reduction selective catalytic reduction V2O5-WO3/TiO2 catalysts |
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