SOLID-STATE EXCHANGE OF LANTHANUM IN BETA-ZEOLITE

A simple route for the solid-state exchange of lanthanum in protonic b eta zeolite is described. The method is shown by XRD and energy disper sive spectrometry analyses to be much more efficient than a classical exchange in solution. It is demonstrated that in spite of the very sim ple experimental conditions used (no vacuum or gas flow),the solid-sta te reaction between lanthanum chloride and beta zeolite does not provo ke any collapse of the zeolitic structure or dealumination. The result ing solid is shown to be active in the alkylation of benzene by isopro panol.