Comparative study of aromatization selectivity during N-heptane reforming on sintered Pt/Al₂O₃ and Pt-Re/Al₂O₃ catalysts
BACKGROUND: The metal dispersed over a support can be present as small crystallites with sizes less than 5 nm. The smaller crystallites favour aromatization while larger crystallites favour cracking/hydrogenolysis. Sintering results in the agglomerization of smaller metal crystallites. Correlation o...
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| Veröffentlicht in: | Journal of chemical technology and biotechnology (1986) 2008-06, Vol.83 (6), p.928-942 |
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| creator | Susu, Alfred A |
| description | BACKGROUND: The metal dispersed over a support can be present as small crystallites with sizes less than 5 nm. The smaller crystallites favour aromatization while larger crystallites favour cracking/hydrogenolysis. Sintering results in the agglomerization of smaller metal crystallites. Correlation of size with aromatization selectivity was investigated.RESULTS: The primary products of n-heptane reforming on fresh Pt were methane, toluene, and benzene, while on fresh Pt-Re, the only product was methane. Both catalysts exhibited enhanced aromatization selectivity at different oxygen sintering temperatures. The reaction products ranged from only toluene at 500 °C sintering temperature to methane at a sintering temperature of 650 °C with no reaction at 800 °C for the Pt/Al₂O₃ catalyst. On Pt-Re/Al₂O₃ catalyst, methane was the sole product at a sintering temperature of 500 °C while only toluene was produced at a sintering temperature of 800 °C.CONCLUSION: This is the first time that sintering has been used to facilitate aromatization of supported Pt and Pt-Re catalysts. A superior selectivity behaviour associated with bi-metallic Pt catalysts is established. It was found that no reaction occurred on Pt catalyst after sintering at 800 °C whereas sintering Pt-Re at 800 °C promoted aromatization solely to toluene. Copyright © 2008 Society of Chemical Industry |
| doi_str_mv | 10.1002/jctb.1894 |
| format | Article |
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The smaller crystallites favour aromatization while larger crystallites favour cracking/hydrogenolysis. Sintering results in the agglomerization of smaller metal crystallites. Correlation of size with aromatization selectivity was investigated.RESULTS: The primary products of n-heptane reforming on fresh Pt were methane, toluene, and benzene, while on fresh Pt-Re, the only product was methane. Both catalysts exhibited enhanced aromatization selectivity at different oxygen sintering temperatures. The reaction products ranged from only toluene at 500 °C sintering temperature to methane at a sintering temperature of 650 °C with no reaction at 800 °C for the Pt/Al₂O₃ catalyst. On Pt-Re/Al₂O₃ catalyst, methane was the sole product at a sintering temperature of 500 °C while only toluene was produced at a sintering temperature of 800 °C.CONCLUSION: This is the first time that sintering has been used to facilitate aromatization of supported Pt and Pt-Re catalysts. A superior selectivity behaviour associated with bi-metallic Pt catalysts is established. It was found that no reaction occurred on Pt catalyst after sintering at 800 °C whereas sintering Pt-Re at 800 °C promoted aromatization solely to toluene. Copyright © 2008 Society of Chemical Industry</description><identifier>ISSN: 0268-2575</identifier><identifier>EISSN: 1097-4660</identifier><identifier>DOI: 10.1002/jctb.1894</identifier><language>eng</language><publisher>Chichester, UK: John Wiley & Sons, Ltd</publisher><subject>aromatization ; demethylation ; hydrogenolysis ; N-heptane ; Pt and Pt-Re alumina catalysts ; sintering</subject><ispartof>Journal of chemical technology and biotechnology (1986), 2008-06, Vol.83 (6), p.928-942</ispartof><rights>Copyright © 2008 Society of Chemical Industry</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fjctb.1894$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fjctb.1894$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Susu, Alfred A</creatorcontrib><title>Comparative study of aromatization selectivity during N-heptane reforming on sintered Pt/Al₂O₃ and Pt-Re/Al₂O₃ catalysts</title><title>Journal of chemical technology and biotechnology (1986)</title><addtitle>J. Chem. Technol. Biotechnol</addtitle><description>BACKGROUND: The metal dispersed over a support can be present as small crystallites with sizes less than 5 nm. The smaller crystallites favour aromatization while larger crystallites favour cracking/hydrogenolysis. Sintering results in the agglomerization of smaller metal crystallites. Correlation of size with aromatization selectivity was investigated.RESULTS: The primary products of n-heptane reforming on fresh Pt were methane, toluene, and benzene, while on fresh Pt-Re, the only product was methane. Both catalysts exhibited enhanced aromatization selectivity at different oxygen sintering temperatures. The reaction products ranged from only toluene at 500 °C sintering temperature to methane at a sintering temperature of 650 °C with no reaction at 800 °C for the Pt/Al₂O₃ catalyst. On Pt-Re/Al₂O₃ catalyst, methane was the sole product at a sintering temperature of 500 °C while only toluene was produced at a sintering temperature of 800 °C.CONCLUSION: This is the first time that sintering has been used to facilitate aromatization of supported Pt and Pt-Re catalysts. A superior selectivity behaviour associated with bi-metallic Pt catalysts is established. It was found that no reaction occurred on Pt catalyst after sintering at 800 °C whereas sintering Pt-Re at 800 °C promoted aromatization solely to toluene. Copyright © 2008 Society of Chemical Industry</description><subject>aromatization</subject><subject>demethylation</subject><subject>hydrogenolysis</subject><subject>N-heptane</subject><subject>Pt and Pt-Re alumina catalysts</subject><subject>sintering</subject><issn>0268-2575</issn><issn>1097-4660</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqFkctO3DAYha0KpA7QRZ-gXrEL40viy5JOW6AaLiqDurSc2KGmuQy2BwiranhTngRHg1B3LGz_PvrOkX4dAD5jdIARItObKpYHWMj8A5hgJHmWM4a2wAQRJjJS8OIj2AnhBiHEBGET8G_Wt0vtdXR3Foa4MgPsa6h93ybpMZ2-g8E2tkqAiwM0K--6a3iW_bHLqDsLva17347aSLouWm8NvIjTw-Z5vT5_Xj9B3Y1C9sv-p1U66mYIMeyB7Vo3wX56fXfB1Y_vi9lxNj8_OpkdzrOaiDzPdMFEWeqSGcIrxnD6iaKsJK6NwViWXGJaGZouziwllGFpmORSCFEVJTV0F-xvcpe-v13ZEFXrQmWbJi3Rr4KihHOJJHkXJIhInEuewOkGvHeNHdTSu1b7QWGkxibU2IQam1A_Z4uv45Ac2cbhQrQPbw7t_yrGKS_U77MjJU8vF7KYf1Mo8V82fK17pa-9C-rqkiBMEUpxeS7oCzC7mt8</recordid><startdate>200806</startdate><enddate>200806</enddate><creator>Susu, Alfred A</creator><general>John Wiley & Sons, Ltd</general><scope>FBQ</scope><scope>BSCLL</scope><scope>7QO</scope><scope>8FD</scope><scope>FR3</scope><scope>P64</scope><scope>7QF</scope><scope>7U5</scope><scope>F28</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>200806</creationdate><title>Comparative study of aromatization selectivity during N-heptane reforming on sintered Pt/Al₂O₃ and Pt-Re/Al₂O₃ catalysts</title><author>Susu, Alfred A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-f2844-a568bbab6d27c66168b85bc91fdd119b7913cd313c76e323619d6979888c5b3d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>aromatization</topic><topic>demethylation</topic><topic>hydrogenolysis</topic><topic>N-heptane</topic><topic>Pt and Pt-Re alumina catalysts</topic><topic>sintering</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Susu, Alfred A</creatorcontrib><collection>AGRIS</collection><collection>Istex</collection><collection>Biotechnology Research Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Aluminium Industry Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of chemical technology and biotechnology (1986)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Susu, Alfred A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparative study of aromatization selectivity during N-heptane reforming on sintered Pt/Al₂O₃ and Pt-Re/Al₂O₃ catalysts</atitle><jtitle>Journal of chemical technology and biotechnology (1986)</jtitle><addtitle>J. Chem. Technol. Biotechnol</addtitle><date>2008-06</date><risdate>2008</risdate><volume>83</volume><issue>6</issue><spage>928</spage><epage>942</epage><pages>928-942</pages><issn>0268-2575</issn><eissn>1097-4660</eissn><abstract>BACKGROUND: The metal dispersed over a support can be present as small crystallites with sizes less than 5 nm. The smaller crystallites favour aromatization while larger crystallites favour cracking/hydrogenolysis. Sintering results in the agglomerization of smaller metal crystallites. Correlation of size with aromatization selectivity was investigated.RESULTS: The primary products of n-heptane reforming on fresh Pt were methane, toluene, and benzene, while on fresh Pt-Re, the only product was methane. Both catalysts exhibited enhanced aromatization selectivity at different oxygen sintering temperatures. The reaction products ranged from only toluene at 500 °C sintering temperature to methane at a sintering temperature of 650 °C with no reaction at 800 °C for the Pt/Al₂O₃ catalyst. On Pt-Re/Al₂O₃ catalyst, methane was the sole product at a sintering temperature of 500 °C while only toluene was produced at a sintering temperature of 800 °C.CONCLUSION: This is the first time that sintering has been used to facilitate aromatization of supported Pt and Pt-Re catalysts. A superior selectivity behaviour associated with bi-metallic Pt catalysts is established. It was found that no reaction occurred on Pt catalyst after sintering at 800 °C whereas sintering Pt-Re at 800 °C promoted aromatization solely to toluene. Copyright © 2008 Society of Chemical Industry</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/jctb.1894</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of chemical technology and biotechnology (1986), 2008-06, Vol.83 (6), p.928-942 |
| issn | 0268-2575 1097-4660 |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | aromatization demethylation hydrogenolysis N-heptane Pt and Pt-Re alumina catalysts sintering |
| title | Comparative study of aromatization selectivity during N-heptane reforming on sintered Pt/Al₂O₃ and Pt-Re/Al₂O₃ catalysts |
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