Influence of transition metal dopants and temperature on the dehydrogenation and rehydrogenation kinetics of NaAlH4
NaAlH4 has been doped with ScCl3, TiCl3, CeCl3, and combinations of these additives by high-energy ball milling. The phase composition of the samples after milling was analyzed by X-ray diffraction. Microstructure and catalyst distribution were investigated by scanning electron microscopy. The effec...
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| Veröffentlicht in: | International journal of hydrogen energy 2012-03, Vol.37 (5), p.4194-4200 |
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| creator | Schmidt, Thomas Röntzsch, Lars Weißgärber, Thomas Kieback, Bernd |
| description | NaAlH4 has been doped with ScCl3, TiCl3, CeCl3, and combinations of these additives by high-energy ball milling. The phase composition of the samples after milling was analyzed by X-ray diffraction. Microstructure and catalyst distribution were investigated by scanning electron microscopy. The effect of the additives and their combination on the two dehydrogenation and rehydrogenation steps of suchlike doped NaAlH4 has been studied under isothermal and isobaric conditions by thermogravimetry under a H2 back pressure of 1 bar. From these studies it turned out that ScCl3-doped NaAlH4 was superior to all other dopants and combinations investigated, both for dehydrogenation and rehydrogenation. For this dopant, the influence of the temperature on the kinetics of each single dehydrogenation and rehydrogenation step and the dehydrogenation kinetics in dependence on the H2 back pressure were studied in detail.
► Transition metal halides show different reactivity during high-energy ball milling with NaAlH4. ► ScCl3 was the most active dopant in all hydrogen desorption and reabsorption steps. ► Co-doping did not show any advantage for the systems investigated. ► Influence of the temperature was significantly stronger for desorption than for absorption. ► The hydrogen back pressure significantly influences the 2nd desorption step. |
| doi_str_mv | 10.1016/j.ijhydene.2011.11.139 |
| format | Article |
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► Transition metal halides show different reactivity during high-energy ball milling with NaAlH4. ► ScCl3 was the most active dopant in all hydrogen desorption and reabsorption steps. ► Co-doping did not show any advantage for the systems investigated. ► Influence of the temperature was significantly stronger for desorption than for absorption. ► The hydrogen back pressure significantly influences the 2nd desorption step.</description><identifier>ISSN: 0360-3199</identifier><identifier>EISSN: 1879-3487</identifier><identifier>DOI: 10.1016/j.ijhydene.2011.11.139</identifier><identifier>CODEN: IJHEDX</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Alternative fuels. Production and utilization ; Applied sciences ; Ball milling ; Co-doping ; Energy ; Exact sciences and technology ; Fuels ; Hydrogen ; Hydrogen storage ; Sodium aluminum hydride</subject><ispartof>International journal of hydrogen energy, 2012-03, Vol.37 (5), p.4194-4200</ispartof><rights>2011 Hydrogen Energy Publications, LLC.</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c412t-d3e1620cc3c6bde317ff0fe4c6d7dacfcef391f26b8a9d312349f446a9f590113</citedby><cites>FETCH-LOGICAL-c412t-d3e1620cc3c6bde317ff0fe4c6d7dacfcef391f26b8a9d312349f446a9f590113</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ijhydene.2011.11.139$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,778,782,3539,27907,27908,45978</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25664572$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Schmidt, Thomas</creatorcontrib><creatorcontrib>Röntzsch, Lars</creatorcontrib><creatorcontrib>Weißgärber, Thomas</creatorcontrib><creatorcontrib>Kieback, Bernd</creatorcontrib><title>Influence of transition metal dopants and temperature on the dehydrogenation and rehydrogenation kinetics of NaAlH4</title><title>International journal of hydrogen energy</title><description>NaAlH4 has been doped with ScCl3, TiCl3, CeCl3, and combinations of these additives by high-energy ball milling. The phase composition of the samples after milling was analyzed by X-ray diffraction. Microstructure and catalyst distribution were investigated by scanning electron microscopy. The effect of the additives and their combination on the two dehydrogenation and rehydrogenation steps of suchlike doped NaAlH4 has been studied under isothermal and isobaric conditions by thermogravimetry under a H2 back pressure of 1 bar. From these studies it turned out that ScCl3-doped NaAlH4 was superior to all other dopants and combinations investigated, both for dehydrogenation and rehydrogenation. For this dopant, the influence of the temperature on the kinetics of each single dehydrogenation and rehydrogenation step and the dehydrogenation kinetics in dependence on the H2 back pressure were studied in detail.
► Transition metal halides show different reactivity during high-energy ball milling with NaAlH4. ► ScCl3 was the most active dopant in all hydrogen desorption and reabsorption steps. ► Co-doping did not show any advantage for the systems investigated. ► Influence of the temperature was significantly stronger for desorption than for absorption. ► The hydrogen back pressure significantly influences the 2nd desorption step.</description><subject>Alternative fuels. Production and utilization</subject><subject>Applied sciences</subject><subject>Ball milling</subject><subject>Co-doping</subject><subject>Energy</subject><subject>Exact sciences and technology</subject><subject>Fuels</subject><subject>Hydrogen</subject><subject>Hydrogen storage</subject><subject>Sodium aluminum hydride</subject><issn>0360-3199</issn><issn>1879-3487</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkM1KAzEURoMoWKuvILMR3EzNXzPNziJqhaIbXYc0ubGp00xNUqFvb8aqCzfChUA43_24B6FzgkcEE3G1GvnVcmchwIhiQkb9MHmABmTSyJrxSXOIBpgJXDMi5TE6SWmFMWkwlwOUHoJrtxAMVJ2rctQh-ey7UK0h67ay3UaHnCodbJVhvYGo8zYWNlR5CZWFUhy7Vwj6K9Rj8c_fmw-QvUn9_kc9bWf8FB053SY4-36H6OXu9vlmVs-f7h9upvPacEJzbRkQQbExzIiFBUYa57ADboRtrDbOgGOSOCoWEy0tI5Rx6TgXWrqxLCLYEF3u925i976FlNXaJwNtqwN026SKPSkYndBxQcUeNbFLKYJTm-jXOu4K1HNCrdSPZdVbVv0wWYIX3x06Gd26ItD49JumYyH4uKGFu95zUA7-8BBVMr7Xbn0Ek5Xt_H9Vnz0ymSQ</recordid><startdate>20120301</startdate><enddate>20120301</enddate><creator>Schmidt, Thomas</creator><creator>Röntzsch, Lars</creator><creator>Weißgärber, Thomas</creator><creator>Kieback, Bernd</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7SU</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>L7M</scope></search><sort><creationdate>20120301</creationdate><title>Influence of transition metal dopants and temperature on the dehydrogenation and rehydrogenation kinetics of NaAlH4</title><author>Schmidt, Thomas ; Röntzsch, Lars ; Weißgärber, Thomas ; Kieback, Bernd</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c412t-d3e1620cc3c6bde317ff0fe4c6d7dacfcef391f26b8a9d312349f446a9f590113</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Alternative fuels. Production and utilization</topic><topic>Applied sciences</topic><topic>Ball milling</topic><topic>Co-doping</topic><topic>Energy</topic><topic>Exact sciences and technology</topic><topic>Fuels</topic><topic>Hydrogen</topic><topic>Hydrogen storage</topic><topic>Sodium aluminum hydride</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schmidt, Thomas</creatorcontrib><creatorcontrib>Röntzsch, Lars</creatorcontrib><creatorcontrib>Weißgärber, Thomas</creatorcontrib><creatorcontrib>Kieback, Bernd</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environmental Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>International journal of hydrogen energy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schmidt, Thomas</au><au>Röntzsch, Lars</au><au>Weißgärber, Thomas</au><au>Kieback, Bernd</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of transition metal dopants and temperature on the dehydrogenation and rehydrogenation kinetics of NaAlH4</atitle><jtitle>International journal of hydrogen energy</jtitle><date>2012-03-01</date><risdate>2012</risdate><volume>37</volume><issue>5</issue><spage>4194</spage><epage>4200</epage><pages>4194-4200</pages><issn>0360-3199</issn><eissn>1879-3487</eissn><coden>IJHEDX</coden><abstract>NaAlH4 has been doped with ScCl3, TiCl3, CeCl3, and combinations of these additives by high-energy ball milling. The phase composition of the samples after milling was analyzed by X-ray diffraction. Microstructure and catalyst distribution were investigated by scanning electron microscopy. The effect of the additives and their combination on the two dehydrogenation and rehydrogenation steps of suchlike doped NaAlH4 has been studied under isothermal and isobaric conditions by thermogravimetry under a H2 back pressure of 1 bar. From these studies it turned out that ScCl3-doped NaAlH4 was superior to all other dopants and combinations investigated, both for dehydrogenation and rehydrogenation. For this dopant, the influence of the temperature on the kinetics of each single dehydrogenation and rehydrogenation step and the dehydrogenation kinetics in dependence on the H2 back pressure were studied in detail.
► Transition metal halides show different reactivity during high-energy ball milling with NaAlH4. ► ScCl3 was the most active dopant in all hydrogen desorption and reabsorption steps. ► Co-doping did not show any advantage for the systems investigated. ► Influence of the temperature was significantly stronger for desorption than for absorption. ► The hydrogen back pressure significantly influences the 2nd desorption step.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijhydene.2011.11.139</doi><tpages>7</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals |
| subjects | Alternative fuels. Production and utilization Applied sciences Ball milling Co-doping Energy Exact sciences and technology Fuels Hydrogen Hydrogen storage Sodium aluminum hydride |
| title | Influence of transition metal dopants and temperature on the dehydrogenation and rehydrogenation kinetics of NaAlH4 |
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