Higher activity of CuCl2/HZSM-5 prepared by dispersion method in selectivecatalytic reduction of NO by propylene (SCR-HC) at lower temperature

A series of samples have been prepared from high dispersion of CuCl2 into N aZSM-5 and HZSM-5 zeolites, and characterized by X-ray diffraction (XRD), d ifferential thermal analysis (DTA), hexane isotherms, and IR spectroscopy. The catalytic activity in selective reduction of NO shows that CuCl2/HZSM-5 catalyst exhibits higher conversion at 300 degrees C than that of CuZSM-5 prepared from an ion-exchange method. Correlation of catalytic data with in frared spectra for CuCl2/HZSM-5, CuCl2/NaZSM-5, and CuZSM-5 samples suggest ed that the catalytic sites can be assigned to synergetic effect of protons and copper species. (C) 1999 Elsevier Science B.V. All rights reserved.