期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 297, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110004
关键词
Ti-MWW zeolite membrane; Synthesis conditions; Secondary hydrothermal synthesis; Phenol hydroxylation
类别
资金
- National Natural Science Foundation of China [21868012, 21968009]
- Jiangxi Provincial Department of Science and Technology [20171BCB24005, 20181ACH80003, 20192ACB80003, 2192BBH80024]
Influences of synthesis conditions on the growth and catalytic performance of the Ti-MWW zeolite membrane are investigated in this work. Medium crystallization time, crystallization temperature, molar ratios of the precursor synthesis gels (TiO2/SiO2, H2O/SiO2 and B2O3/SiO2) are crucial to prepare the compact and good catalytic performanceTi-MWW zeolite membranes. High crystallization temperature and long crystallization time cause a hetero zeolite phase membrane on the mullite support. Excessive titanium in the precursor synthesis gel could easily arise TiO2 particles and non-framework TiO6 species on the membrane surface, which are greatly decreased the catalytic performance of the Ti- MWW zeolite membrane. Dilute precursor synthesis gel is not favor for preparing dense Ti-MWW zeolite layer. The as-synthesized Ti-MWW zeolite membrane is applied as catalytic membrane reactor for phenol hydroxylation by pervaporation in this study, the phenol conversion and benzenediol selectivity are 41.42% and 98.33%.
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