Preparation of titanium-containing large pore molecular sieve from H-Al-Beta zeolite

Ti-Al-Beta zeolite has been synthesized by gas-solid isomorphous substitution with H-Al-Beta zeolite as precursor. X-ray diffraction pattern showed that its structure was similar to that of zeolite H-Al-Beta. The only difference between their IR spectra was an extra adsorption band appearing at 960cm(-1). The study of IR and UV-Vis spectra showed that ii was incorporated into the framework of Beta zeolite and Ti was tetrahedrally coordinated as part of the framework. After the precursor was treated with acid, the incorporation of titanium became easy. With increasing acid concentration, the content of Ti into the framework increased. In addition, increasing substitution time, the content of Ti into the framework also increased.