Journal
APPLIED CATALYSIS A-GENERAL
Volume 413, Issue -, Pages 117-131Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.10.049
Keywords
Cu-ZSM-5; NO adsorption; TPD; Copper; Redox chemistry; Nitrogen oxides
Categories
Funding
- MiSE-CNR
Ask authors/readers for more resources
The interaction of NO with Cu-ZSM-5 has been investigated in a temperature range (25-225 degrees C) in which no steady-state reactions occur. The study has been conducted by performing adsorption tests at variable exposure times and analysing the phenomena that occur by continuous monitoring of the gaseous effluents as well as by performing a subsequent TPD. The effect of temperature, catalyst pre-treatment and composition of the adsorbing mixture (NO/He, NO/O-2/He, N2O/He and N-2/He) have been evaluated. In situ FTIR experiments have been also carried out under similar conditions. The main observed phenomena are: (i) reduced Cu+ sites are quickly re-oxidized by NO producing large amounts of N2O: (ii) adsorbed NO slowly reacts with gaseous NO to give surface nitrates and still N2O in the gas phase regardless the copper oxidation state. A mechanism of copper re-oxidation and nitrates formation under the different conditions explored has been proposed on the basis of these findings. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available