10-P-08 - Preparation and characterization of H-ZSM-5 exchanged with cobalt by solid state ion exchange

Abstract

Publisher Summary This chapter discusses the preparation and characterization of H-ZSM-5 exchanged with cobalt by solid-state ion exchange. It compares the physico-chemical and catalytic properties of Co-ZSM-5 zeolites prepared by solid-state exchange with different cobalt/aluminum (Co/Al) ratios and exchange temperatures. The catalysts are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis) and temperature-programmed desorption (TPD) of ammonia. Solid-state ion exchange generated new Lewis acid sites and one proton is exchanged per Co 2+ species. UV-Visible spectra indicate the presence of some minor cobalt oxides not detected by XRD. Catalyst using Co/Al ratio equal to one and issued from exchange temperature equal to 500°C show high activity and selectivity toward acetonitrile by the ammoxidation of ethylene.