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Sökning: WFRF:(Gremaud Robin) > (2008) > Formation of Ca(BH4...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003071naa a2200397 4500
001oai:lup.lub.lu.se:409ae6e8-3067-4c8d-a623-b40afe8b9343
003SwePub
008160401s2008 | |||||||||||000 ||eng|
0247 a https://lup.lub.lu.se/record/11965092 URI
0247 a https://doi.org/10.1021/jp076325k2 DOI
040 a (SwePub)lu
041 a engb eng
042 9 SwePub
072 7a art2 swepub-publicationtype
072 7a ref2 swepub-contenttype
1001 a Barkhordarian, Gagik4 aut
2451 0a Formation of Ca(BH4)(2) from hydrogenation of CaH2+MgB2 composite
264 c 2008-01-31
264 1b American Chemical Society (ACS),c 2008
520 a The hydrogenation of the CaH2+MgB2 Composite and the dehydrogenation of the resulting products are investigated in detail by in situ time-resolved synchrotron radiation powder X-ray diffraction, high-pressure differential scanning calorimetry, infrared, and thermovolumetric measurements. It is demonstrated that a Ca(BH4)(2)+MgH2 composite is formed by hydrogenating a CaH2+MgB2 composite, at 350 degrees C and 140 bar of hydrogen. Two phases of Ca(BH4)(2) were characterized: alpha- and beta-Ca(BH4)(2). alpha-Ca(BH4)(2) transforms to beta-Ca(BH4)(2) at about 130 degrees C. Under the conditions used in the present study, beta-Ca(BH4)(2) decomposes first to CaH2, Ca3Mg4H14, Mg, B (or MgB2 depending on experimental conditions), and hydrogen at 360 degrees C, before complete decomposition to CaH2, Mg, B (or MgB2), and hydrogen at 400 degrees C. During hydrogenation under 140 bar of hydrogen, beta-Ca(BH4)(2) is formed at 250 degrees C, and alpha-Ca(BH4)(2) is formed when the sample is cooled to less than 130 degrees C. Ti isopropoxide improves the kinetics of the reactions, during both hydrogenation and dehydrogenation. The dehydrogenation temperature decreases to 250 degrees C, with 1 wt % of this additive, and hydrogenation starts already at 200 degrees C. We propose that the improved kinetics of the above reactions with MgB2 (compared to pure boron) can be explained by the different boron bonding within the crystal structure of MgB2 and pure boron.
650 7a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng
7001 a Jensen, Torben R4 aut
7001 a Doppiu, Stefania4 aut
7001 a Boesenberg, Ulrike4 aut
7001 a Borgschulte, Andreas4 aut
7001 a Gremaud, Robin4 aut
7001 a Cerenius, Yngveu Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory4 aut0 (Swepub:lu)mbfys-yc
7001 a Dornheim, Martin4 aut
7001 a Klassen, Thomas4 aut
7001 a Bormann, Ruediger4 aut
7102 a Lunds universitetb MAX IV-laboratoriet4 org
7730 t Journal of Physical Chemistry Cd : American Chemical Society (ACS)g 112:7, s. 2743-2749q 112:7<2743-2749x 1932-7447x 1932-7455
8564 u http://dx.doi.org/10.1021/jp076325ky FULLTEXT
8564 8u https://lup.lub.lu.se/record/1196509
8564 8u https://doi.org/10.1021/jp076325k

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