Catalysis Database

Decomposition and selective catalytic reduction of NO by propane on CuZSM-5 zeolites: a mechanistic study

Z. , Schay and V , Samuel and G, Pal-Borbely and A , Beck and A.V., Ramaswamy and L , Guczi (2000) Decomposition and selective catalytic reduction of NO by propane on CuZSM-5 zeolites: a mechanistic study. Journal of Molecular Catalysis A: Chemical , 162 . pp. 191-198.

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Abstract

NO decomposition and selective catalytic reductionSCR.of NO by propane in oxygen were compared over Cu-ZSM-5 with various SirAl ratios and extent of exchange. It was established that the turnover frequencyTOF.values referred to copper ions species characterized by NO desorption, are independent of the SirAl ratio and the extent of exchange. The presence of propane and oxygen accelerates N2 formation and higher conversion can be reached at lower temperature. TPD experiments indicate that the Cu2qO.NO.NO2. surface complex, which is formed as an intermediate in the decomposition of NO, is not the active pathway in SCR. In SCR of NO by propane in the presence of oxygen, the first step is CuI. to CuII. conversion by oxygen. NO2 formation is facilitated by CuII. species, which react with propane forming a nitrito–propane compound. Its result in N2 formation at a lower temperature than what is required for decomposition of NO.

Item Type:Article
Subjects:Science > Chemistry
ID Code:475
Deposited By:INVALID USER
Deposited On:27 Mar 2007 19:29
Last Modified:27 Mar 2007 19:29

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