An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization
This work presents the results of homopolymerization of ethylene using an hybrid system (nBuCp)2ZrCl2-Cp2ZrCl 2, supported on silica. The catalytic systems were analyzed by RBS, DRIFTS and EXAFS and polyethylenes (PE) by GPC and DSC. The catalytic activities and the polymer properties showed depende...
| Authors: | ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2004 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/97832 |
| Online Access: | http://hdl.handle.net/11336/97832 |
| Access Level: | Open access |
| Keyword: | SUPPORTED METALLOCENES THEORETICAL CHARACTERIZATION ZIRCONOCENE https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| _version_ | 1878403774651826176 |
|---|---|
| author | Aguiao Rodrigues, Silvia |
| author2 | Silveira, Fernando dos Santos, J.H.Z. Ferreira, María Luján |
| author2_role | author author author |
| author_browse | Aguiao Rodrigues, Silvia Ferreira, María Luján Silveira, Fernando dos Santos, J.H.Z. |
| author_facet | Aguiao Rodrigues, Silvia Silveira, Fernando dos Santos, J.H.Z. Ferreira, María Luján |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | This work presents the results of homopolymerization of ethylene using an hybrid system (nBuCp)2ZrCl2-Cp2ZrCl 2, supported on silica. The catalytic systems were analyzed by RBS, DRIFTS and EXAFS and polyethylenes (PE) by GPC and DSC. The catalytic activities and the polymer properties showed dependence on the different ratio used (nBuCp)2ZrCl2/Cp2ZrCl2 at the preparation step. Theoretical studies permit us to conclude that the metallocenes interact with the surface in different ways. Depending on the addition order and the molar ratio between both metallocenes, distribution and nature of active species would be different. Possibility of binuclear active sites with different propagation and termination constants is analyzed and discussed. EHMO calculations allow us to conclude that Cp2ZrCl 2 has a strong affinity by AIS plane, whereas (nBuCp) 2ZrCl2 shows similar affinity for both silica planes. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_be1deddfc0909f5d605fb10ed8b3d42e |
| identifier_str_mv | Aguiao Rodrigues, Silvia; Silveira, Fernando; dos Santos, J.H.Z.; Ferreira, María Luján; An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization; Elsevier Science; Journal of Molecular Catalysis A: Chemical; 216; 1; 7-2004; 19-27 1381-1169 CONICET Digital CONICET |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/97832 |
| publishDate | 2004 |
| publishDateSort | 2004 |
| publisher | Elsevier Science |
| publisherStr | Elsevier Science |
| reponame_str | CONICET Digital (CONICET) |
| spelling | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization Aguiao Rodrigues, Silvia Silveira, Fernando dos Santos, J.H.Z. Ferreira, María Luján SUPPORTED METALLOCENES THEORETICAL CHARACTERIZATION ZIRCONOCENE https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 This work presents the results of homopolymerization of ethylene using an hybrid system (nBuCp)2ZrCl2-Cp2ZrCl 2, supported on silica. The catalytic systems were analyzed by RBS, DRIFTS and EXAFS and polyethylenes (PE) by GPC and DSC. The catalytic activities and the polymer properties showed dependence on the different ratio used (nBuCp)2ZrCl2/Cp2ZrCl2 at the preparation step. Theoretical studies permit us to conclude that the metallocenes interact with the surface in different ways. Depending on the addition order and the molar ratio between both metallocenes, distribution and nature of active species would be different. Possibility of binuclear active sites with different propagation and termination constants is analyzed and discussed. EHMO calculations allow us to conclude that Cp2ZrCl 2 has a strong affinity by AIS plane, whereas (nBuCp) 2ZrCl2 shows similar affinity for both silica planes. Fil: Aguiao Rodrigues, Silvia. Universidade Federal do Rio Grande do Sul; Brasil Fil: Silveira, Fernando. Universidade Federal do Rio Grande do Sul; Brasil Fil: dos Santos, J.H.Z.. Universidade Federal do Rio Grande do Sul; Brasil Fil: Ferreira, María Luján. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina Elsevier Science http://hdl.handle.net/11336/97832 Aguiao Rodrigues, Silvia; Silveira, Fernando; dos Santos, J.H.Z.; Ferreira, María Luján; An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization; Elsevier Science; Journal of Molecular Catalysis A: Chemical; 216; 1; 7-2004; 19-27 1381-1169 CONICET Digital CONICET |
| spellingShingle | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization Aguiao Rodrigues, Silvia SUPPORTED METALLOCENES THEORETICAL CHARACTERIZATION ZIRCONOCENE https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| status_str | publishedVersion |
| title | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| title_full | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| title_fullStr | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| title_full_unstemmed | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| title_short | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| title_sort | An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization |
| topic | SUPPORTED METALLOCENES THEORETICAL CHARACTERIZATION ZIRCONOCENE https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| topic_facet | SUPPORTED METALLOCENES THEORETICAL CHARACTERIZATION ZIRCONOCENE https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| url | http://hdl.handle.net/11336/97832 |