SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF TITANIUM SILICATES PREPARED USING PHOSPHONIUM IONS

A titanium silicate has been synthesized in the presence of tetrabutyl phosphonium ions. X-ray diffraction has revealed that this solid was i dentical to the already reported TS-2, with the MEL structure. The rat e of crystallization of the zeolite as well as the maximal amount of T i atoms that can be incorporated in the lattice are specific of the te mplate. When the synthesis is carried out under stirring conditions, t he size of the crystals is comparable to that of a standard TS-2. For similar Ti contents, the catalytic activities and selectivities in the hydroxylation of phenol with hydrogen peroxide are identical.