A novel and dense tubular Ti-MWW zeolite membrane for the phenol hydroxylation was successfully prepared on mullite support by secondary hydrothermal synthesis. The ultraviolet–visible spectroscopy and fourier transform infrared spectrometer confirmed that the Ti species was thetetrahedrally coordinated state in zeolite framework. Plenty of pure phase sheet Ti-MWW zeolite crystals were fully covered on the support surface, the Ti/Si molar ratio and thickness of the Ti-MWW zeolite layer were 0.016 and 5 μm by X-ray photoelectron spectroscopy and scanning electron microscope characterization results, respectively. The membrane showed good catalytic performance for phenol hydroxylation under pervaporation condition at 323 K. The phenol conversion and dihydroxybenzene selectivity were 22.94% and 98.33%, respectively.

通过二次水热合成成功地在莫来石载体上制备了一种新型的致密的管状苯酚Ti-MWW分子筛膜。紫外可见光谱和傅立叶变换红外光谱仪证实，Ti物种在沸石骨架中为四面体配位态。X射线光电子能谱和扫描电子显微镜表征结果表明，在载体表面上完全覆盖了大量的纯相片Ti-MWW沸石晶体，Ti / Si摩尔比和Ti-MWW沸石层的厚度分别为0.016和5μm。 ， 分别。该膜在323 K的全蒸发条件下对苯酚的羟基化反应具有良好的催化性能。苯酚的转化率和二羟基苯的选择性分别为22.94％和98.33％。