Effect of Milling Parameters on the Dehydrogenation Properties of the Mg−Ti−H System
Magnesium-based alloys are promising candidates as potential hydrogen storage materials due to their inherent high hydrogen contents. Small particle size which can be achieved by milling and small amounts of transition-metal compounds as catalysts result in increased hydrogen release/uptake kinetics...
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| Veröffentlicht in: | Journal of physical chemistry. C 2009-11, Vol.113 (44), p.19344-19350 |
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| container_end_page | 19350 |
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| container_issue | 44 |
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| container_title | Journal of physical chemistry. C |
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| creator | Choi, Young Joon Lu, Jun Sohn, Hong Yong Fang, Zhigang Zak Rönnebro, Ewa |
| description | Magnesium-based alloys are promising candidates as potential hydrogen storage materials due to their inherent high hydrogen contents. Small particle size which can be achieved by milling and small amounts of transition-metal compounds as catalysts result in increased hydrogen release/uptake kinetics. In this work, we examined the effects of various milling parameters and TiH2 content on the dehydrogenation properties of the Mg−Ti−H system. The samples were prepared with different amounts of TiH2 using various milling methods and conditions. The activation energy and the enthalpy change of dehydrogenation of the milled samples were determined by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results indicated that, among a variety of MgH2/TiH2 ratios and milling conditions, samples with 9.1 mol % TiH2 milled in a dual-planetary high energy mill for 4 h under 15 MPa hydrogen pressure were found to be the optimal materials, displaying a substantially reduced activation energy and enthalpy change for MgH2 dehydrogenation. |
| doi_str_mv | 10.1021/jp907218t |
| format | Article |
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The results indicated that, among a variety of MgH2/TiH2 ratios and milling conditions, samples with 9.1 mol % TiH2 milled in a dual-planetary high energy mill for 4 h under 15 MPa hydrogen pressure were found to be the optimal materials, displaying a substantially reduced activation energy and enthalpy change for MgH2 dehydrogenation.</description><identifier>ISSN: 1932-7447</identifier><identifier>EISSN: 1932-7455</identifier><identifier>DOI: 10.1021/jp907218t</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>08 HYDROGEN ; ACTIVATION ENERGY ; ALLOYS ; C: Energy Conversion and Storage ; CATALYSTS ; DEHYDROGENATION ; ENTHALPY ; HYDROGEN ; HYDROGEN STORAGE ; KINETICS ; MILLING ; MIXTURES ; PARTICLE SIZE ; PLANETS ; THERMAL GRAVIMETRIC ANALYSIS</subject><ispartof>Journal of physical chemistry. 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(PNNL), Richland, WA (United States)</creatorcontrib><title>Effect of Milling Parameters on the Dehydrogenation Properties of the Mg−Ti−H System</title><title>Journal of physical chemistry. C</title><addtitle>J. Phys. Chem. C</addtitle><description>Magnesium-based alloys are promising candidates as potential hydrogen storage materials due to their inherent high hydrogen contents. Small particle size which can be achieved by milling and small amounts of transition-metal compounds as catalysts result in increased hydrogen release/uptake kinetics. In this work, we examined the effects of various milling parameters and TiH2 content on the dehydrogenation properties of the Mg−Ti−H system. The samples were prepared with different amounts of TiH2 using various milling methods and conditions. The activation energy and the enthalpy change of dehydrogenation of the milled samples were determined by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results indicated that, among a variety of MgH2/TiH2 ratios and milling conditions, samples with 9.1 mol % TiH2 milled in a dual-planetary high energy mill for 4 h under 15 MPa hydrogen pressure were found to be the optimal materials, displaying a substantially reduced activation energy and enthalpy change for MgH2 dehydrogenation.</description><subject>08 HYDROGEN</subject><subject>ACTIVATION ENERGY</subject><subject>ALLOYS</subject><subject>C: Energy Conversion and Storage</subject><subject>CATALYSTS</subject><subject>DEHYDROGENATION</subject><subject>ENTHALPY</subject><subject>HYDROGEN</subject><subject>HYDROGEN STORAGE</subject><subject>KINETICS</subject><subject>MILLING</subject><subject>MIXTURES</subject><subject>PARTICLE SIZE</subject><subject>PLANETS</subject><subject>THERMAL GRAVIMETRIC ANALYSIS</subject><issn>1932-7447</issn><issn>1932-7455</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNptkDFOAzEQRS0EEiFQcANTUFAsjNf2OluiEAgSEZFIQWcZ7zhxlKwj2xS5ATVH5CRsFJSKZmY0en_05xNyyeCWQcnulpsaVMkG-Yj0WM3LQgkpjw-zUKfkLKUlgOTAeI-8j5xDm2lwdOJXK9_O6dREs8aMMdHQ0rxA-oCLbRPDHFuTfbebxrDBmD2mnW5HTOY_X98z35UxfdumjOtzcuLMKuHFX--T2eNoNhwXL69Pz8P7l8KUA5kLzqsSP8AwBFk2jZIIpeHc1lY23AkxUAodk7VlSgoHXCiplAJgrkJAy_vkan82pOx1sj6jXdjQtt1Tuq7qCkTH3OwZG0NKEZ3eRL82casZ6F1q-pBax17vWWOTXobP2Hbm_-F-AccNbKc</recordid><startdate>20091105</startdate><enddate>20091105</enddate><creator>Choi, Young Joon</creator><creator>Lu, Jun</creator><creator>Sohn, Hong Yong</creator><creator>Fang, Zhigang Zak</creator><creator>Rönnebro, Ewa</creator><general>American Chemical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20091105</creationdate><title>Effect of Milling Parameters on the Dehydrogenation Properties of the Mg−Ti−H System</title><author>Choi, Young Joon ; Lu, Jun ; Sohn, Hong Yong ; Fang, Zhigang Zak ; Rönnebro, Ewa</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a285t-3362eb0a1e052dd75e02a33c9c5d3f44877ef159c1754f03475777001f6e0ec3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>08 HYDROGEN</topic><topic>ACTIVATION ENERGY</topic><topic>ALLOYS</topic><topic>C: Energy Conversion and Storage</topic><topic>CATALYSTS</topic><topic>DEHYDROGENATION</topic><topic>ENTHALPY</topic><topic>HYDROGEN</topic><topic>HYDROGEN STORAGE</topic><topic>KINETICS</topic><topic>MILLING</topic><topic>MIXTURES</topic><topic>PARTICLE SIZE</topic><topic>PLANETS</topic><topic>THERMAL GRAVIMETRIC ANALYSIS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Choi, Young Joon</creatorcontrib><creatorcontrib>Lu, Jun</creatorcontrib><creatorcontrib>Sohn, Hong Yong</creatorcontrib><creatorcontrib>Fang, Zhigang Zak</creatorcontrib><creatorcontrib>Rönnebro, Ewa</creatorcontrib><creatorcontrib>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of physical chemistry. C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Choi, Young Joon</au><au>Lu, Jun</au><au>Sohn, Hong Yong</au><au>Fang, Zhigang Zak</au><au>Rönnebro, Ewa</au><aucorp>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Milling Parameters on the Dehydrogenation Properties of the Mg−Ti−H System</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. C</addtitle><date>2009-11-05</date><risdate>2009</risdate><volume>113</volume><issue>44</issue><spage>19344</spage><epage>19350</epage><pages>19344-19350</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>Magnesium-based alloys are promising candidates as potential hydrogen storage materials due to their inherent high hydrogen contents. Small particle size which can be achieved by milling and small amounts of transition-metal compounds as catalysts result in increased hydrogen release/uptake kinetics. In this work, we examined the effects of various milling parameters and TiH2 content on the dehydrogenation properties of the Mg−Ti−H system. The samples were prepared with different amounts of TiH2 using various milling methods and conditions. The activation energy and the enthalpy change of dehydrogenation of the milled samples were determined by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results indicated that, among a variety of MgH2/TiH2 ratios and milling conditions, samples with 9.1 mol % TiH2 milled in a dual-planetary high energy mill for 4 h under 15 MPa hydrogen pressure were found to be the optimal materials, displaying a substantially reduced activation energy and enthalpy change for MgH2 dehydrogenation.</abstract><cop>United States</cop><pub>American Chemical Society</pub><doi>10.1021/jp907218t</doi><tpages>7</tpages></addata></record> |
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| source | American Chemical Society Journals |
| subjects | 08 HYDROGEN ACTIVATION ENERGY ALLOYS C: Energy Conversion and Storage CATALYSTS DEHYDROGENATION ENTHALPY HYDROGEN HYDROGEN STORAGE KINETICS MILLING MIXTURES PARTICLE SIZE PLANETS THERMAL GRAVIMETRIC ANALYSIS |
| title | Effect of Milling Parameters on the Dehydrogenation Properties of the Mg−Ti−H System |
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