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Amphiphilic Ti-V-β Zeolites: Preparation and Phase-boundary Catalysis |
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| Keywords:amphiphilic zeolite preparation phase-boundary catalysis |
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| Author | Institution | | XIAO Zhi-Wen | Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha 410081 | | LI Yan-Feng | Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha 410081 | | HE Zhen | Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha 410081 | | YU Ling | Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha 410081 | | HE Hong-Yun | Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Hunan Normal University, Changsha 410081 |
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| Abstract: |
| Amphiphilic TMS-Ti-V-β and OTS-Ti-V-β zeolites were prepared by modifying Ti-V-β zeolites with trimethylchlorosilane and n-octadecyltrichlorosilane, respectively. All the samples were characterized by XRD, FTIR, UV-Vis, SEM, and low temperature N2 adsorption-desorption. Modified samples retained their original crystal structure, while their crystal morphology was somewhat changed. N2 adsorption indicates that these amphiphilic zeolites have a little smaller surface area and BJH volume of pores compared with their parent zeolites(BET surface area and BJH volume of pores of zeolites are 428 m2·g-1 and 0.54 cm3·g-1 for Ti-V-β, 382 m2·g-1 and 0.40 cm3·g-1 for TMS-Ti-V-β, and 290 m2·g-1 and 0.28 cm3·g-1 for OTS-Ti-V-β, respectively). These amphiphilic Ti-V-β zeolites can be distributed at the water-organic phase boundary. They both show good catalytic performance in the phase-boundary reactions of cyclohexene hydration without co-solvents and stirring(the hydration yield of cyclohexene and the selectivity of cycloheanol are 0.61% and 76% for Ti-V-β, 2.01% and 90% for OTS-Ti-V-β, and 7.35% and 95% for TMS-Ti-V-β, respectively). The experimental results indicate that the Ti-V-β zeolite modified with trimethylchlomsilane, TMS-Ti-V-β, has much higher catalytic activity than its parent Ti-V-β zeolite in the phase-boundary catalysis. |
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