期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 363, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2023.112823
关键词
Supported TS-2 zeolites; Fixed-bed catalytic reactor; Catalytic oxidation; Phenol hydroxylation; Isopropanol
In this study, a good inter-grown TS-2 zeolite layer is successfully prepared on the outer surface of porous millimeter alpha-Al2O3 sphere by secondary hydrothermal synthesis. The research investigates the influences of synthesis parameters on Ti active micro-environment, crystal morphology, and catalytic performance of the supported TS-2 zeolites. It also studies the formation process of the supported TS-2 zeolites and determines the optimal synthesis conditions for catalytic performance.
Good inter-grown TS-2 zeolites layer is successfully prepared on the outer surface of porous millimeter alpha-Al2O3 sphere by secondary hydrothermal synthesis. The supported TS-2 zeolites are loaded into a fixed-bed catalytic reactor for catalyzing phenol hydroxylation by hydrogen peroxide, which could efficiently avoid the fussy separation process. Influences of synthesis parameters on Ti active micro-environment, crystal morphology and catalytic performance of the supported TS-2 zeolites are investigated in this work, medium isopropanol content is necessary for preparing fine and homogenous TS-2 zeolites layer on the porous alpha-Al2O3 sphere. Besides, for-mation process of the supported TS-2 zeolites is studied in this study, which divided into three stages, dissolution of seed crystals, formation of novel nuclei, growth and aggregation of TS-2 zeolites layer. When the titanium source, isopropanol/SiO2 and TiO2/SiO2 molar ratio of the initial synthesis gel are tetrabutyl titanate, 1.0 and 0.035, tetra-coordinated titanium containing and compact TS-2 zeolites layer are fully covered on the alpha-Al2O3 sphere, the optimum phenol conversion and dihydroxybenzene selectivity of the zeolites are 40.07% and 98.52% at 65 degrees C.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据