Stability of cerium-modified γ-alumina catalyst support in supercritical water
Supercritical water is emerging as a promising medium to carry out a variety of catalytic reactions. However the support material can undergo transformation in the hydrothermal environment, as shown in the figure below. In this work the stability of a common support material γ-Al 2O 3 is examined at...
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| Veröffentlicht in: | Applied catalysis. A, General General, 2010-06, Vol.381 (1), p.177-182 |
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| creator | Byrd, Adam J. Gupta, Ram B. |
| description | Supercritical water is emerging as a promising medium to carry out a variety of catalytic reactions. However the support material can undergo transformation in the hydrothermal environment, as shown in the figure below. In this work the stability of a common support material γ-Al
2O
3 is examined at 500–700
°C and 246
bar.
Supercritical water (above 374.1
°C and 220.6
bar) is emerging as a promising medium to carry out a variety of catalytic reactions, including reforming to produce hydrogen. However, when using a heterogeneous catalyst the support material can undergo transformations in the hydrothermal environment. In this work the stability of γ-Al
2O
3 modified with 1–10
wt% Ce in supercritical water is examined, specifically in the temperature range of 500–700
°C at 246
bar. Transformations of the γ-phase were slowed but not prevented. Based on X-ray analysis, the transformation of γ-Al
2O
3 proceeded through the κ phase toward the stable α phase. Reduced cerium species were seen to be oxidized in the supercritical water environment, and low Ce-loading supports maintained the highest BET surface areas. The stabilization was greatest at 700
°C, where Ce-modified aluminas retained significantly higher specific surface areas than unmodified alumina. |
| doi_str_mv | 10.1016/j.apcata.2010.04.006 |
| format | Article |
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2O
3 is examined at 500–700
°C and 246
bar.
Supercritical water (above 374.1
°C and 220.6
bar) is emerging as a promising medium to carry out a variety of catalytic reactions, including reforming to produce hydrogen. However, when using a heterogeneous catalyst the support material can undergo transformations in the hydrothermal environment. In this work the stability of γ-Al
2O
3 modified with 1–10
wt% Ce in supercritical water is examined, specifically in the temperature range of 500–700
°C at 246
bar. Transformations of the γ-phase were slowed but not prevented. Based on X-ray analysis, the transformation of γ-Al
2O
3 proceeded through the κ phase toward the stable α phase. Reduced cerium species were seen to be oxidized in the supercritical water environment, and low Ce-loading supports maintained the highest BET surface areas. The stabilization was greatest at 700
°C, where Ce-modified aluminas retained significantly higher specific surface areas than unmodified alumina.</description><identifier>ISSN: 0926-860X</identifier><identifier>EISSN: 1873-3875</identifier><identifier>DOI: 10.1016/j.apcata.2010.04.006</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Alumina ; Aluminum oxide ; Catalysis ; Catalysts ; Cerium ; Chemistry ; Exact sciences and technology ; General and physical chemistry ; Hydrothermal ; Phase transformations ; Stability ; Stabilization ; Supercritical water ; Surface area ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; Transformations</subject><ispartof>Applied catalysis. A, General, 2010-06, Vol.381 (1), p.177-182</ispartof><rights>2010 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c368t-58f215de448dad55c5dd233e8a6277bbd407e297bf1789bc4d5006d0aef0d3b23</citedby><cites>FETCH-LOGICAL-c368t-58f215de448dad55c5dd233e8a6277bbd407e297bf1789bc4d5006d0aef0d3b23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.apcata.2010.04.006$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=22861014$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Byrd, Adam J.</creatorcontrib><creatorcontrib>Gupta, Ram B.</creatorcontrib><title>Stability of cerium-modified γ-alumina catalyst support in supercritical water</title><title>Applied catalysis. A, General</title><description>Supercritical water is emerging as a promising medium to carry out a variety of catalytic reactions. However the support material can undergo transformation in the hydrothermal environment, as shown in the figure below. In this work the stability of a common support material γ-Al
2O
3 is examined at 500–700
°C and 246
bar.
Supercritical water (above 374.1
°C and 220.6
bar) is emerging as a promising medium to carry out a variety of catalytic reactions, including reforming to produce hydrogen. However, when using a heterogeneous catalyst the support material can undergo transformations in the hydrothermal environment. In this work the stability of γ-Al
2O
3 modified with 1–10
wt% Ce in supercritical water is examined, specifically in the temperature range of 500–700
°C at 246
bar. Transformations of the γ-phase were slowed but not prevented. Based on X-ray analysis, the transformation of γ-Al
2O
3 proceeded through the κ phase toward the stable α phase. Reduced cerium species were seen to be oxidized in the supercritical water environment, and low Ce-loading supports maintained the highest BET surface areas. The stabilization was greatest at 700
°C, where Ce-modified aluminas retained significantly higher specific surface areas than unmodified alumina.</description><subject>Alumina</subject><subject>Aluminum oxide</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Cerium</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Hydrothermal</subject><subject>Phase transformations</subject><subject>Stability</subject><subject>Stabilization</subject><subject>Supercritical water</subject><subject>Surface area</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><subject>Transformations</subject><issn>0926-860X</issn><issn>1873-3875</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNp9kM1KAzEUhYMoWKtv4GI24mpqJpO_bgQp_kGhCxXchUxyB1LmzySj9Ll8D5_JDC0uXd3L5Tv3cA5ClwVeFLjgN9uFHoyOekFwOmG6wJgfoVkhRZmXUrBjNMNLwnPJ8fspOgthizEmdMlmaPMSdeUaF3dZX2cGvBvbvO2tqx3Y7Oc7183Yuk5n0_9mF2IWxmHofcxcN63gjXfRGd1kXzqCP0cntW4CXBzmHL093L-unvL15vF5dbfOTcllzJmsScEsUCqttowZZi0pS5CaEyGqylIsgCxFVRdCLitDLUuZLNZQY1tWpJyj6_3fwfcfI4SoWhcMNI3uoB-DEqzklBdMJJLuSeP7EDzUavCu1X6nCqym-tRW7etTU30KU5WskuzqYKBDSld73RkX_rSESJ7ENHG3ew5S2k8HXgXjoDNgnQcTle3d_0a_Of2Jew</recordid><startdate>20100615</startdate><enddate>20100615</enddate><creator>Byrd, Adam J.</creator><creator>Gupta, Ram B.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QQ</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20100615</creationdate><title>Stability of cerium-modified γ-alumina catalyst support in supercritical water</title><author>Byrd, Adam J. ; Gupta, Ram B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c368t-58f215de448dad55c5dd233e8a6277bbd407e297bf1789bc4d5006d0aef0d3b23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Alumina</topic><topic>Aluminum oxide</topic><topic>Catalysis</topic><topic>Catalysts</topic><topic>Cerium</topic><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Hydrothermal</topic><topic>Phase transformations</topic><topic>Stability</topic><topic>Stabilization</topic><topic>Supercritical water</topic><topic>Surface area</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>Transformations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Byrd, Adam J.</creatorcontrib><creatorcontrib>Gupta, Ram B.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Ceramic Abstracts</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><jtitle>Applied catalysis. A, General</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Byrd, Adam J.</au><au>Gupta, Ram B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stability of cerium-modified γ-alumina catalyst support in supercritical water</atitle><jtitle>Applied catalysis. A, General</jtitle><date>2010-06-15</date><risdate>2010</risdate><volume>381</volume><issue>1</issue><spage>177</spage><epage>182</epage><pages>177-182</pages><issn>0926-860X</issn><eissn>1873-3875</eissn><abstract>Supercritical water is emerging as a promising medium to carry out a variety of catalytic reactions. However the support material can undergo transformation in the hydrothermal environment, as shown in the figure below. In this work the stability of a common support material γ-Al
2O
3 is examined at 500–700
°C and 246
bar.
Supercritical water (above 374.1
°C and 220.6
bar) is emerging as a promising medium to carry out a variety of catalytic reactions, including reforming to produce hydrogen. However, when using a heterogeneous catalyst the support material can undergo transformations in the hydrothermal environment. In this work the stability of γ-Al
2O
3 modified with 1–10
wt% Ce in supercritical water is examined, specifically in the temperature range of 500–700
°C at 246
bar. Transformations of the γ-phase were slowed but not prevented. Based on X-ray analysis, the transformation of γ-Al
2O
3 proceeded through the κ phase toward the stable α phase. Reduced cerium species were seen to be oxidized in the supercritical water environment, and low Ce-loading supports maintained the highest BET surface areas. The stabilization was greatest at 700
°C, where Ce-modified aluminas retained significantly higher specific surface areas than unmodified alumina.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.apcata.2010.04.006</doi><tpages>6</tpages></addata></record> |
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| subjects | Alumina Aluminum oxide Catalysis Catalysts Cerium Chemistry Exact sciences and technology General and physical chemistry Hydrothermal Phase transformations Stability Stabilization Supercritical water Surface area Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Transformations |
| title | Stability of cerium-modified γ-alumina catalyst support in supercritical water |
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