Preparation of silica-immobilized titanium-containing silsesquioxane catalysts and activity for the epoxidation of alkenes
Silsesquioxanes containing tetrapodal titanium species and alkenylsilyl groups were immobilized onto dimethylsilyl-functionalized silica having mesopores by chemical tethering via hydrosilylative reaction in the presence of a Pt catalyst. The immobilized catalysts showed higher activity than their c...
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| Veröffentlicht in: | Chemical engineering science 2008-10, Vol.63 (20), p.4917-4923 |
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| creator | Wada, Kenji Watanabe, Naoki Kondo, Teruyuki Mitsudo, Take-aki |
| description | Silsesquioxanes containing tetrapodal titanium species and alkenylsilyl groups were immobilized onto dimethylsilyl-functionalized silica having mesopores by chemical tethering via hydrosilylative reaction in the presence of a Pt catalyst. The immobilized catalysts showed higher activity than their corresponding homogeneous catalyst towards the epoxidation of cyclooctene by
tert-butylhydroperoxide, probably because of the improvement of the micro-environment around the titanium center. The reaction was found to be truly heterogeneous, since no further reaction proceeded after the separation of the catalyst by filtration. These catalysts also showed excellent catalytic activity for the epoxidation using hydrogen peroxide as an oxidant, while the parent homogeneous catalysts did not show any activity at all. |
| doi_str_mv | 10.1016/j.ces.2007.11.015 |
| format | Article |
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tert-butylhydroperoxide, probably because of the improvement of the micro-environment around the titanium center. The reaction was found to be truly heterogeneous, since no further reaction proceeded after the separation of the catalyst by filtration. These catalysts also showed excellent catalytic activity for the epoxidation using hydrogen peroxide as an oxidant, while the parent homogeneous catalysts did not show any activity at all.</description><identifier>ISSN: 0009-2509</identifier><identifier>EISSN: 1873-4405</identifier><identifier>DOI: 10.1016/j.ces.2007.11.015</identifier><identifier>CODEN: CESCAC</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Catalysis ; Catalytic reactions ; Chemical engineering ; Chemistry ; Epoxidation of alkenes ; Exact sciences and technology ; Filtration ; General and physical chemistry ; Hydrogen peroxide ; Hydrosilylation ; Liquid-liquid and fluid-solid mechanical separations ; Reactors ; Tethered catalysts ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; Titanium-containing silsesquioxane</subject><ispartof>Chemical engineering science, 2008-10, Vol.63 (20), p.4917-4923</ispartof><rights>2007 Elsevier Ltd</rights><rights>2008 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c468t-a9891d4489bbdf155478b0da3506c39e6933fcf655b8d2ee651e6ca9cf1fdbee3</citedby><cites>FETCH-LOGICAL-c468t-a9891d4489bbdf155478b0da3506c39e6933fcf655b8d2ee651e6ca9cf1fdbee3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0009250907008652$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,3537,23909,23910,25118,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=20846210$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Wada, Kenji</creatorcontrib><creatorcontrib>Watanabe, Naoki</creatorcontrib><creatorcontrib>Kondo, Teruyuki</creatorcontrib><creatorcontrib>Mitsudo, Take-aki</creatorcontrib><title>Preparation of silica-immobilized titanium-containing silsesquioxane catalysts and activity for the epoxidation of alkenes</title><title>Chemical engineering science</title><description>Silsesquioxanes containing tetrapodal titanium species and alkenylsilyl groups were immobilized onto dimethylsilyl-functionalized silica having mesopores by chemical tethering via hydrosilylative reaction in the presence of a Pt catalyst. The immobilized catalysts showed higher activity than their corresponding homogeneous catalyst towards the epoxidation of cyclooctene by
tert-butylhydroperoxide, probably because of the improvement of the micro-environment around the titanium center. The reaction was found to be truly heterogeneous, since no further reaction proceeded after the separation of the catalyst by filtration. These catalysts also showed excellent catalytic activity for the epoxidation using hydrogen peroxide as an oxidant, while the parent homogeneous catalysts did not show any activity at all.</description><subject>Applied sciences</subject><subject>Catalysis</subject><subject>Catalytic reactions</subject><subject>Chemical engineering</subject><subject>Chemistry</subject><subject>Epoxidation of alkenes</subject><subject>Exact sciences and technology</subject><subject>Filtration</subject><subject>General and physical chemistry</subject><subject>Hydrogen peroxide</subject><subject>Hydrosilylation</subject><subject>Liquid-liquid and fluid-solid mechanical separations</subject><subject>Reactors</subject><subject>Tethered catalysts</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>Titanium-containing silsesquioxane</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wada, Kenji</creatorcontrib><creatorcontrib>Watanabe, Naoki</creatorcontrib><creatorcontrib>Kondo, Teruyuki</creatorcontrib><creatorcontrib>Mitsudo, Take-aki</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Chemical engineering science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wada, Kenji</au><au>Watanabe, Naoki</au><au>Kondo, Teruyuki</au><au>Mitsudo, Take-aki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Preparation of silica-immobilized titanium-containing silsesquioxane catalysts and activity for the epoxidation of alkenes</atitle><jtitle>Chemical engineering science</jtitle><date>2008-10</date><risdate>2008</risdate><volume>63</volume><issue>20</issue><spage>4917</spage><epage>4923</epage><pages>4917-4923</pages><issn>0009-2509</issn><eissn>1873-4405</eissn><coden>CESCAC</coden><abstract>Silsesquioxanes containing tetrapodal titanium species and alkenylsilyl groups were immobilized onto dimethylsilyl-functionalized silica having mesopores by chemical tethering via hydrosilylative reaction in the presence of a Pt catalyst. 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tert-butylhydroperoxide, probably because of the improvement of the micro-environment around the titanium center. The reaction was found to be truly heterogeneous, since no further reaction proceeded after the separation of the catalyst by filtration. These catalysts also showed excellent catalytic activity for the epoxidation using hydrogen peroxide as an oxidant, while the parent homogeneous catalysts did not show any activity at all.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ces.2007.11.015</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0009-2509 |
| ispartof | Chemical engineering science, 2008-10, Vol.63 (20), p.4917-4923 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Applied sciences Catalysis Catalytic reactions Chemical engineering Chemistry Epoxidation of alkenes Exact sciences and technology Filtration General and physical chemistry Hydrogen peroxide Hydrosilylation Liquid-liquid and fluid-solid mechanical separations Reactors Tethered catalysts Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Titanium-containing silsesquioxane |
| title | Preparation of silica-immobilized titanium-containing silsesquioxane catalysts and activity for the epoxidation of alkenes |
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