Solid ion exchange of copper chlorides with zsm-5 zeolite: Nature of copper species in zeolite matrix
Written by sctunisie no commentsCopper exchanged ZSM-5 zeolites have been prepared between separate phases of copper chlorides (CuCl, CuCl2.2H2O) and NH4+-ZSM-5 by a solid ion exchange procedure. The ground mixture of the zeolite and the copper precursors has been heat-treated in a flow of dry air or in static conditions (without a flow of dry air). It has been shown that the solid ion exchange proceeds at high temperatures with consumption of the acidic OH groups and evolution of hydrochloric acid under the preservation of the zeolite structure. In contrast, in the case of samples prepared by static condition, we note the destruction of the zeolite structure and formation of amorphous materials when high loading of copper chlorides was used. Nature of copper species in the zeolite matrix has been also discussed.
H. Tounsi, S. Mseddi, S. Djemel, J. F. Lambert
solid-state ion exchange, Cu-ZS M-5, zeolite structure destruction
Pages 1345-1355
