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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
KeywordTs-1 Zeolite Heat Treatment Propylene Epoxidation Propylene Oxide
Source PublicationCHINESE JOURNAL OF CATALYSIS
2002-11-01
Volume23Issue:6Pages:493-497
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordACIDIC PROPERTIES ; TITANIUM-SILICALITES-1
AbstractThe 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.
Language英语
WOS IDWOS:000179903200005
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/139169
Collection中国科学院大连化学物理研究所
Affiliation1.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
Recommended Citation
GB/T 7714
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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