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Low-Temperature Selective Catalytic Reduction of NO with $NH_3$ over $Ti_{0.9}M_{0.1}O_{2-\delta}$ (M = Cr, Mn, Fe, Co, Cu)

Roy, Sounak and Viswanath, B and Hegde, MS and Madras, Giridhar (2008) Low-Temperature Selective Catalytic Reduction of NO with $NH_3$ over $Ti_{0.9}M_{0.1}O_{2-\delta}$ (M = Cr, Mn, Fe, Co, Cu). In: Journal Of Physical Chemistry C, 112 (15). 6002 -6012.

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Abstract

The catalysts, $Ti_{0.9}M_{0.1}O_{2-\delta}$ (M = Cr, Mn, Fe, Co, Cu), were synthesized in anatase phase by solution combustion. Selective catalytic reduction (SCR) of NO with $NH_3$ was investigated over these catalysts. The reaction occurred at the lowest temperature over $Ti_{0.9}M_{0.1}O_{2-\delta}$, but the selectivity for $N_2$ was highest over $Ti_{0.9}M_{0.1}O_{2-\delta}$. Therefore, both Mn and Fe were substituted in $TiO_2 (Ti_{0.9}Mn_{0.05}Fe_{0.05}O_{2-\delta})$. The reaction occurred at low temperature with a high selectivity over this catalyst. In order to understand the reaction mechanism and the nature of the active sites, temperature programmed desorption (TPD) of $NH_3$ and hydrogen uptake studies were carried out. The relation between the Lewis acid sites and SCR window and the relation between Bronsted acid sites and low temperature was established. The order of the SCR reaction with respect to NO, $NH_3$, and $O_2$ was also investigated. It was also shown that the $N_2$ selectivity of the SCR reaction has a strong inverse correlation with the oxidation of ammonia.

Item Type: Journal Article Copyright of this article belongs to American Chemical Society. Division of Chemical Sciences > Materials Research CentreDivision of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Mechanical Sciences > Chemical Engineering 12 May 2008 19 Sep 2010 04:44 http://eprints.iisc.ernet.in/id/eprint/13949

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