Evaluation of catalyst leaching in silica supported zirconocene alumino hydride catalysts
Zirconocene aluminohydride complexes (e.g. nBuCp2ZrH3AlH2) afford higher MW polyethylene at significantly higher activity than their zirconocene dichloride counterparts (nBuCp2ZrCl2) when activated by methylaluminoxane (MAO). In this work, supported catalysts with different Al:Zr ratios on SiO2, mod...
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| Veröffentlicht in: | Canadian journal of chemical engineering 2017-06, Vol.95 (6), p.1124-1132 |
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| container_title | Canadian journal of chemical engineering |
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| creator | Comparán‐Padilla, Víctor E. Pérez‐Berúmen, Catalina M. Cadenas‐Pliego, Gregorio Rodríguez‐Hernández, María T. Collins, Scott Pérez‐Camacho, Odilia |
| description | Zirconocene aluminohydride complexes (e.g. nBuCp2ZrH3AlH2) afford higher MW polyethylene at significantly higher activity than their zirconocene dichloride counterparts (nBuCp2ZrCl2) when activated by methylaluminoxane (MAO). In this work, supported catalysts with different Al:Zr ratios on SiO2, modified with MAO were prepared, and evaluated for their tendency towards leaching in ethylene polymerization, using additional MAO or other alkylaluminum compounds. The extent of catalyst leaching was estimated by comparing kinetic data of filtered versus unfiltered catalysts during ethylene polymerization. Polydispersities and molecular weights of the HDPE obtained using filtered versus unfiltered catalysts were also compared under similar polymerization conditions. Polyethylene morphologies obtained in homogeneous and heterogeneous phase were compared by SEM. Bulk densities of the HDPE were evaluated and related to the leaching in the polymerizations.
Effect of the zirconocene aluminohydride leaching in the morphology of HDPE obtained in slurry. |
| doi_str_mv | 10.1002/cjce.22773 |
| format | Article |
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Effect of the zirconocene aluminohydride leaching in the morphology of HDPE obtained in slurry.</description><subject>Addition polymerization</subject><subject>Bulk density</subject><subject>catalysis</subject><subject>Catalysts</subject><subject>Chemical engineering</subject><subject>Ethylene</subject><subject>High density polyethylenes</subject><subject>Kinetics</subject><subject>Leaching</subject><subject>Morphology</subject><subject>Polyethylene</subject><subject>Polyethylenes</subject><subject>polymer chemistry</subject><subject>polymer synthesis</subject><subject>Polymerization</subject><subject>Silicon dioxide</subject><subject>Zirconium</subject><issn>0008-4034</issn><issn>1939-019X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp90E1LxDAQBuAgCq6rF39BwIsI1cmH2-YoZf1iwYuCnko2nbpZuklNWqX-ertWPHjwNAzzzDC8hBwzOGcA_MKsDZ5znqZih0yYEioBpp53yQQAskSCkPvkIMb10HKQbEJe5u-67nRrvaO-oka3uu5jS2vUZmXdK7WORltbo2nsmsaHFkv6aYPxzht0SIftjXWervoy2BJ_L8RDslfpOuLRT52Sp-v5Y36bLB5u7vKrRWJEykSSoqmYxjKbiWzGMi5UKbOKCQlLbsxSYjYMDecCUAJnuExLxjmkGpRmppyJKTkd7zbBv3UY22Jjo8G61g59FwumQHIhsks10JM_dO274IbvBsVVKjIQW3U2KhN8jAGrogl2o0NfMCi2KRfblIvvlAfMRvxha-z_kUV-n8_HnS-toH_a</recordid><startdate>201706</startdate><enddate>201706</enddate><creator>Comparán‐Padilla, Víctor E.</creator><creator>Pérez‐Berúmen, Catalina M.</creator><creator>Cadenas‐Pliego, Gregorio</creator><creator>Rodríguez‐Hernández, María T.</creator><creator>Collins, Scott</creator><creator>Pérez‐Camacho, Odilia</creator><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>7QF</scope></search><sort><creationdate>201706</creationdate><title>Evaluation of catalyst leaching in silica supported zirconocene alumino hydride catalysts</title><author>Comparán‐Padilla, Víctor E. ; Pérez‐Berúmen, Catalina M. ; Cadenas‐Pliego, Gregorio ; Rodríguez‐Hernández, María T. ; Collins, Scott ; Pérez‐Camacho, Odilia</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3713-7ecf1aed8638618239d48f1340b2ccb4e8aedc2230e4021eb7d12207a09a1cd63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Addition polymerization</topic><topic>Bulk density</topic><topic>catalysis</topic><topic>Catalysts</topic><topic>Chemical engineering</topic><topic>Ethylene</topic><topic>High density polyethylenes</topic><topic>Kinetics</topic><topic>Leaching</topic><topic>Morphology</topic><topic>Polyethylene</topic><topic>Polyethylenes</topic><topic>polymer chemistry</topic><topic>polymer synthesis</topic><topic>Polymerization</topic><topic>Silicon dioxide</topic><topic>Zirconium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Comparán‐Padilla, Víctor E.</creatorcontrib><creatorcontrib>Pérez‐Berúmen, Catalina M.</creatorcontrib><creatorcontrib>Cadenas‐Pliego, Gregorio</creatorcontrib><creatorcontrib>Rodríguez‐Hernández, María T.</creatorcontrib><creatorcontrib>Collins, Scott</creatorcontrib><creatorcontrib>Pérez‐Camacho, Odilia</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Aluminium Industry Abstracts</collection><jtitle>Canadian journal of chemical engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Comparán‐Padilla, Víctor E.</au><au>Pérez‐Berúmen, Catalina M.</au><au>Cadenas‐Pliego, Gregorio</au><au>Rodríguez‐Hernández, María T.</au><au>Collins, Scott</au><au>Pérez‐Camacho, Odilia</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evaluation of catalyst leaching in silica supported zirconocene alumino hydride catalysts</atitle><jtitle>Canadian journal of chemical engineering</jtitle><date>2017-06</date><risdate>2017</risdate><volume>95</volume><issue>6</issue><spage>1124</spage><epage>1132</epage><pages>1124-1132</pages><issn>0008-4034</issn><eissn>1939-019X</eissn><abstract>Zirconocene aluminohydride complexes (e.g. nBuCp2ZrH3AlH2) afford higher MW polyethylene at significantly higher activity than their zirconocene dichloride counterparts (nBuCp2ZrCl2) when activated by methylaluminoxane (MAO). In this work, supported catalysts with different Al:Zr ratios on SiO2, modified with MAO were prepared, and evaluated for their tendency towards leaching in ethylene polymerization, using additional MAO or other alkylaluminum compounds. The extent of catalyst leaching was estimated by comparing kinetic data of filtered versus unfiltered catalysts during ethylene polymerization. Polydispersities and molecular weights of the HDPE obtained using filtered versus unfiltered catalysts were also compared under similar polymerization conditions. Polyethylene morphologies obtained in homogeneous and heterogeneous phase were compared by SEM. Bulk densities of the HDPE were evaluated and related to the leaching in the polymerizations.
Effect of the zirconocene aluminohydride leaching in the morphology of HDPE obtained in slurry.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1002/cjce.22773</doi><tpages>9</tpages></addata></record> |
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| subjects | Addition polymerization Bulk density catalysis Catalysts Chemical engineering Ethylene High density polyethylenes Kinetics Leaching Morphology Polyethylene Polyethylenes polymer chemistry polymer synthesis Polymerization Silicon dioxide Zirconium |
| title | Evaluation of catalyst leaching in silica supported zirconocene alumino hydride catalysts |
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