Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex
| Autor(a) principal: | |
|---|---|
| Data de Publicação: | 2009 |
| Outros Autores: | , , , , , , |
| Tipo de documento: | Artigo |
| Idioma: | eng |
| Título da fonte: | Repositório Institucional da UFBA |
| Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ri/6180 |
Resumo: | Trabalho completo: acesso restrito, p. 114–122 |
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Fisch, Adriano G.Cardozo, Nilo S. M.Secchi, Argimiro ResendeStedile, Fernanda C.Radtke, CláudioSá, Denise S. deRocha, Zênis N. daSantos, João Henrique Zimnoch dosFisch, Adriano G.Cardozo, Nilo S. M.Secchi, Argimiro ResendeStedile, Fernanda C.Radtke, CláudioSá, Denise S. deRocha, Zênis N. daSantos, João Henrique Zimnoch dos2012-06-19T13:43:26Z2009-11-30Applied Catalysis A: Generalhttp://www.repositorio.ufba.br/ri/handle/ri/6180v. 370, n. 1–2Trabalho completo: acesso restrito, p. 114–122The immobilization of Cp2ZrCl2 was performed by entrapment within the binary oxide SiO2–WO3 using a non-hydrolytic sol–gel route. The catalyst and oxide matrix were characterized by complementary techniques (Rutherford backscattering spectrometry, ultraviolet–visible diffuse reflectance and infrared transmission spectroscopy, differential pulse voltammetry, adsorption–desorption of N2, and X-ray diffraction). The catalyst performance in terms of catalytic activity and polymer properties was evaluated by ethylene polymerization. Catalyst characterization suggested that the entrapped complex exhibited lower Zr electronic density than the corresponding unsupported metallocene. The polymerization results also revealed that this low Zr electronic density is optimized in terms of complex activation with low MAO concentration (low [Al/Zr] ratio) and reactivity. This fine tuning results in a catalyst system that is active with a low [Al/Zr] ratio and that achieves high catalytic activity. The results demonstrate that the entrapping method allows the generation of a catalyst system in which part of the activation process is attributed to the support. In this sense, the support may partially play MAO functions by stabilizing the active catalytic species.Submitted by Bruna Lessa (lessbruna@gmail.com) on 2012-06-19T13:43:26Z No. of bitstreams: 1 (77)1-s2.0-S0926860X0900667X-main.pdf: 597622 bytes, checksum: 69c78cbd0366af80dd8a0da61536eba3 (MD5)Made available in DSpace on 2012-06-19T13:43:26Z (GMT). No. of bitstreams: 1 (77)1-s2.0-S0926860X0900667X-main.pdf: 597622 bytes, checksum: 69c78cbd0366af80dd8a0da61536eba3 (MD5) Previous issue date: 2009-11-30Elsevierhttp://dx.doi.org/10.1016/j.apcata.2009.09.032reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBASupported metalloceneSol–gelPolymerizationPolyethyleneMixed oxidesImmobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complexApplied Catalysis A: Generalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01enginfo:eu-repo/semantics/openAccessORIGINAL(77)1-s2.0-S0926860X0900667X-main.pdf(77)1-s2.0-S0926860X0900667X-main.pdfapplication/pdf597622https://repositorio.ufba.br/bitstream/ri/6180/1/%2877%291-s2.0-S0926860X0900667X-main.pdf69c78cbd0366af80dd8a0da61536eba3MD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/6180/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXT(77)1-s2.0-S0926860X0900667X-main.pdf.txt(77)1-s2.0-S0926860X0900667X-main.pdf.txtExtracted texttext/plain48405https://repositorio.ufba.br/bitstream/ri/6180/3/%2877%291-s2.0-S0926860X0900667X-main.pdf.txte40cc68c8d537f4aac37da0c4e6b9910MD53ri/61802022-08-08 13:17:59.281oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-08-08T16:17:59Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
| dc.title.pt_BR.fl_str_mv |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| dc.title.alternative.pt_BR.fl_str_mv |
Applied Catalysis A: General |
| title |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| spellingShingle |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex Fisch, Adriano G. Supported metallocene Sol–gel Polymerization Polyethylene Mixed oxides |
| title_short |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| title_full |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| title_fullStr |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| title_full_unstemmed |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| title_sort |
Immobilization of zirconocene within silica–tungsten by entrapment: Tuning electronic effects of the support on the supported complex |
| author |
Fisch, Adriano G. |
| author_facet |
Fisch, Adriano G. Cardozo, Nilo S. M. Secchi, Argimiro Resende Stedile, Fernanda C. Radtke, Cláudio Sá, Denise S. de Rocha, Zênis N. da Santos, João Henrique Zimnoch dos |
| author_role |
author |
| author2 |
Cardozo, Nilo S. M. Secchi, Argimiro Resende Stedile, Fernanda C. Radtke, Cláudio Sá, Denise S. de Rocha, Zênis N. da Santos, João Henrique Zimnoch dos |
| author2_role |
author author author author author author author |
| dc.contributor.author.fl_str_mv |
Fisch, Adriano G. Cardozo, Nilo S. M. Secchi, Argimiro Resende Stedile, Fernanda C. Radtke, Cláudio Sá, Denise S. de Rocha, Zênis N. da Santos, João Henrique Zimnoch dos Fisch, Adriano G. Cardozo, Nilo S. M. Secchi, Argimiro Resende Stedile, Fernanda C. Radtke, Cláudio Sá, Denise S. de Rocha, Zênis N. da Santos, João Henrique Zimnoch dos |
| dc.subject.por.fl_str_mv |
Supported metallocene Sol–gel Polymerization Polyethylene Mixed oxides |
| topic |
Supported metallocene Sol–gel Polymerization Polyethylene Mixed oxides |
| description |
Trabalho completo: acesso restrito, p. 114–122 |
| publishDate |
2009 |
| dc.date.issued.fl_str_mv |
2009-11-30 |
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2012-06-19T13:43:26Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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http://www.repositorio.ufba.br/ri/handle/ri/6180 |
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Applied Catalysis A: General |
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v. 370, n. 1–2 |
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Applied Catalysis A: General v. 370, n. 1–2 |
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http://www.repositorio.ufba.br/ri/handle/ri/6180 |
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Elsevier |
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Elsevier |
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http://dx.doi.org/10.1016/j.apcata.2009.09.032 |
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reponame:Repositório Institucional da UFBA instname:Universidade Federal da Bahia (UFBA) instacron:UFBA |
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