期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 278, 期 -, 页码 30-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.11.019
关键词
Ti-beta zeolite; Nano-crystalline; Intracrystalline mesopores; Hydrothermal synthesis; Alkaline precursor; Alkenes epoxidation
类别
资金
- State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC) [33600000-17-ZC0607-0004]
Aluminum-free hierarchical Ti-beta was hydrothermally synthesized from a basic precursor using tetraethyl ammonium hydroxide and sodium fluorine as the structure directing agent and mineralization agent, respectively. The physicochemical properties are analyzed by XRD, TEM, UV-Vis, Si-29 NMR et al. The catalytic activity was evaluated via the epoxidation of cyclohexene and 1-oectene. The Ti-beta achieved are plate-like nano-crystals with crystal size of about 100 x 300 x 300 nm. More importantly, intracrystalline mesopores in the 10-40 nm range were simultaneously created, and most of the titanium could be isomorphously substituted into the zeolite matrix. The Ti-beta is defects-free, the thermal stability is excellent. Due to the improved accessibility of the active sites inside the crystals, the activity increased by more than 30% compared with the conventional Ti-beta formed from the HF-procedure.
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