Abstract: Hydrolysis of 1,2-epoxycyclohexane as a probe reaction was employed to investigate the surface acid properties of titanium-silicate zeolite (HTS-1) catalyst under various conditions. The results indicated that the hydrolysis reaction was mainly affected by solvent polarity and diffusion limitation, and HTS-1 showed outstanding catalytic performance for this reaction. Quantitative and qualitative analysis of acidity and acid sites by means of pyridine adsorption was performed using UV-Vis and FT-IR spectroscopy, respectively, which can distinguish Brønsted acidic sites and Lewis acidic sites and to calculate precisely the surface acid amount of HTS-1. These results not only expand the applications of HTS-1 in fine chemical synthesis but also provide a basis for effectively improving the catalytic performance of HTS-1 in oxidation.

Key words: titanium-silicate zeolite, HTS-1, acidity, 1, 2-epoxycyclohexane, hydrolysis