以阳离子聚合物为介孔模板合成多级孔 TS-1

以阳离子聚合物为介孔模板合成多级孔 TS-1

王晓星;李钢;刘丽萍;刘海鸥

【期刊名称】《催化学报》 【年(卷),期】2011(032)010

【摘要】Hierarchical TS-1 zeolites were synthesized successfully by the hydrothermal method using cationic polyquaternium-7 and poly-quateraium-6 as mesoporous template, respectively. The obtained samples

were

characterized

by

X-ray

diffraction,

UV-Visible

spectroscopy, scanning electron microscopy, transmission electron microscopy, and N2 adsorption-desorption. The catalytic performance of the materials was evaluated for the oxidation of bulky molecular benzothiophene and small molecular thiophene. The results show that the addition of polyquatemium-7 has a little effect on the crystallization, the state of titanium sites, and the crystal morphology of hierarchical TS-1. However, the crystal morphology of hierarchical TS-1 changes from small cubic crystals to large rectangular crystals with increasing content of polyquaternium-6. Hierarchical TS-1 zeolites synthesized from the two kinds of polymers possess obvious mesoporous channels. Moreover, they give much higher activity in benzothiophene oxidation than TS-1, which is attributed to the presence of additional mesopores for reducing the diffusion limitation. In addition, hierarchical TS-1 zeolites also exhibit the similar oxidative activity for thiophene to TS-1