以1,2-环氧环己烷水解为主要探针反应研究了钛硅分子筛HTS-1的表面酸催化性能.结果表明,HTS-1表面酸中心具有较高的催化活性,它的扩散性能和溶剂极性对反应活性的影响很大.还采用吸附吡啶的红外光谱和紫外光谱对HTS-1催化剂表面酸性进行了定性和定量分析.这些结果不仅拓展了HTS-1在精细有机合成中的应用,而且为有效提高HTS-1的催化氧化性能提供了依据.
Hydrolysis of 1,2-epoxycyclohexane as a probe reaction was employed to investigate the surface acid properties of tita-nium-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-! 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 Breasted 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.
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