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Characterization and catalytic performance of TS-1 after heat treatment in different media
Liu, XW; Wang, XS; Liu, HO; Liu, YH; Zhuang, JQ; Bao, XH
关键词Ts-1 Zeolite Heat Treatment Propylene Epoxidation Propylene Oxide
刊名CHINESE JOURNAL OF CATALYSIS
2002-11-01
23期:6页:493-497
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Chemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
研究领域[WOS]Chemistry ; Engineering
关键词[WOS]ACIDIC PROPERTIES ; TITANIUM-SILICALITES-1
英文摘要The structure and surface acidity of TS-1 were adjusted by heat treatment, in order to increase its selectivity for propylene oxide (PO) in epoxidation of propylene with H2O2. The TS-1 samples, treated at different temperatures (540, 650 and 750 degreesC) in the presence of different media(vapor or air), were characterized by XRF, XRD, FT-IR, UV-Vis, MAS NMR and NH3-TPD, to determine the changes of their framework structure, surface acid sites and total amount of acid. Using propylene epoxidation as a probe, the influence of the treatment conditions on their selectivity for PO was investigated. The results show that, with the treatment temperature increasing, the Bronsted acid sites and the total amount of acid decrease obviously, the selectivity for PO, especially over TS-1 sample treated at 750 degreesC in the presence of vapor, increases from 29% to 56%, while the catalytic activity remains constant. The amount of framework aluminum in TS-1 has changed after heat treatment, it decreases with treatment temperature increasing, especially in the presence of vapor. It can be concluded that the decrease in surface acidity of TS-1 is due to the removal of framework aluminum when TS-1 was treated at high temperature; while the decrease in surface acidity of TS-1 leads to the selectivity for PO increase. The Si-O tetrahedron is partly destroyed at high temperatures, and the framework titanium may convert into non-framework titanium, which further can be sintered to form anatase TiO2. The decrease in the amount of non-framework titanium in the presence of vapor shows that the presence of vapor favors to remove non-framework titanium of TS-1.
语种英语
WOS记录号WOS:000179903200005
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139169
专题中国科学院大连化学物理研究所
作者单位1.Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China
2.Dalian Univ Technol, Inst Ind Catalysts, Dalian 116012, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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Liu, XW,Wang, XS,Liu, HO,et al. Characterization and catalytic performance of TS-1 after heat treatment in different media[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(6):493-497.
APA Liu, XW,Wang, XS,Liu, HO,Liu, YH,Zhuang, JQ,&Bao, XH.(2002).Characterization and catalytic performance of TS-1 after heat treatment in different media.CHINESE JOURNAL OF CATALYSIS,23(6),493-497.
MLA Liu, XW,et al."Characterization and catalytic performance of TS-1 after heat treatment in different media".CHINESE JOURNAL OF CATALYSIS 23.6(2002):493-497.
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