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Title: Synthesis of Zr-beta zeolite in fluoride medium and its applications in catalytic liquid-phase reactions
Keywords: Al-free Zr-beta Zeolite, Meerwein-Ponndorf-Verley Reduction and Oppenauer Oxidation, Solid Lewis Acid, Cyclisation, Dynamic Kinetic Resolution.
Issue Date: 10-Dec-2004
Source: ZHU YONGZHONG (2004-12-10). Synthesis of Zr-beta zeolite in fluoride medium and its applications in catalytic liquid-phase reactions. ScholarBank@NUS Repository.
Abstract: Zeolite beta is one of the few large-pore high-silica zeolites with a three-dimensional pore structure containing 12-membered apertures, which makes it a very suitable and regenerable catalyst for the production of fine chemicals in liquid phase reactions. In this thesis, Al-free Zr-beta zeolite with Si/Zr ratio from 84 to infinity was synthesized in a fluoride medium at near neutral pH. The material has been characterized by XRD, 29Si MAS NMR, 13C MAS NMR, IR, XPS, SEM, and TG. To study the catalytic activity, zeolite Zr-beta was used as catalyst for several liquid phase reactions. Zeolite Zr-beta was found to be a regioselective catalyst for the Meerwein-Ponndorf-Verley (MPV) reduction of 4-tert-butylcyclohexanone, a chemoselective catalyst for the MPV reduction of cinnamaldehyde and Oppenauer oxidation of cinnamyl alcohol, a highly stereoselective catalyst for the cyclisation of citronellal, and also an effective racemization catalyst for the dynamic kinetic resolution (DKR) of 1-phenylethanol.
Appears in Collections:Ph.D Theses (Open)

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