Selective catalytic reduction of NO by NH3 on Cu (II) ion-exchanged offretite prepared by different methods

Abstract

The influence of the preparation method on the NO-SCR by NH 3 activity of Cu-OFF catalysts has been studied on presence of oxygen. The catalysts structure and the nature of copper species have been investigated by XRD, 27 Al MAS NMR, UV-visible spectroscopy and H 2 -TPR. Among the examined preparation methods, the ionic exchange in aqueous solution gives the highest efficient catalyst in NO-SCR. It is shown that Cu cationic species are formed in large extent with this method despite the presence of minor amounts of small oxide clusters.

The Effect of Zn on Offretite Zeolite Properties. Acidic Characterizations and NH3-TPD Desorption Models

“…Zeolites of the offretite (OFF) family have been identified as having good prospects for a number of chemical processes such as (a) the transformation of toluene and the isomerization of m-xylene, 1,2 (b) the catalytic selective reduction of NOx using Cu (II) ion exchange, 3 (c) methanol conversion using an OFF protonic form 4 (d) n-hexane conversion to C 3 hydrocarbons and o-xylene conversion to p-xylene, 5 and (e) CO 2 adsorption using K-OFF. 6 Recently, the CREC research team at the Chemical Reaction Engineering Center, The University of Western Ontario, proposed a new application for OFF zeolites 7,8 in FCC units.…”