2026-05-14T09:29:49Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/57792024-07-25T07:26:31Zcom_10259_9476com_10259.4_106com_10259_2604col_10259_9477

Valentoni, Antonio df56509e-2858-4f94-87b6-2d3ed2cbe062 500 Mulas, Gabriele aa63a411-6065-4d48-ad42-59458297698d 500 Enzo, Stefano 04219dc4-84cf-43cd-908e-e9295dcdfc28 500 Garroni, Sebastiano 227 500 0000-0001-7686-6589 2021-05-24T09:40:47Z 2021-05-24T09:40:47Z 2018-02 1463-9076 http://hdl.handle.net/10259/5779 10.1039/c7cp07157d 1463-9084 The present work concerns the catalytic effect of VNbO5, a ternary oxide prepared via a solid-state route, on the sorption performance of MgH2. Three doped systems, namely 5, 10 and 15 wt% VNbO5– MgH2 have been prepared by ball milling and thoroughly characterized. Hydrogen sorption, evaluated by temperature programmed desorption experiments, revealed a significant reduction of the desorption temperature from 330 1C for the un-doped sample (prepared and tested for comparison) to 235 1C for the VNbO5-doped sample. Furthermore, more than 5 wt% of hydrogen can be absorbed in 5 minutes at 160 1C under 20 bar of hydrogen, which is remarkable compared to the 0.7 wt% achieved for the un-doped system. The sample doped with 15 wt% of additive, showed good reversibility: over 5 wt% of hydrogen with negligible degradation even after 70 consecutive cycles at 275 1C and 50 cycles at 300 1C. The kinetics analysis carried out by Kissinger’s method exhibited a considerable reduction of the activation energy for the desorption process. Finally, pressure-composition-isotherm experiments conducted at three different temperatures allowed estimating the thermodynamic stability of the system and shed light on the additive role of VNbO5. application/pdf eng Royal Society of Chemistry Physical Chemistry Chemical Physics. 2018, V. 20, n. 6, p. 4100-4108 https://doi.org/10.1039/C7CP07157D Química física Chemistry, Physical and theoretical Remarkable hydrogen storage properties of MgH2 doped with VNbO5 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion info:eu-repo/semantics/openAccess Physical Chemistry Chemical Physics 20 6 4100 4108 THUMBNAIL Valentoni-pccp_2018.pdf.jpg Valentoni-pccp_2018.pdf.jpg IM Thumbnail image/jpeg 3639 https://riubu.ubu.es/bitstream/10259/5779/3/Valentoni-pccp_2018.pdf.jpg 7bbb613b22d62f83cd59ad9606de88e8 MD5 3 LICENSE license.txt license.txt text/plain; charset=utf-8 998 https://riubu.ubu.es/bitstream/10259/5779/2/license.txt aa90105e1c90a1b4fe810649aa967b7d MD5 2 ORIGINAL Valentoni-pccp_2018.pdf Valentoni-pccp_2018.pdf application/pdf 3210331 https://riubu.ubu.es/bitstream/10259/5779/1/Valentoni-pccp_2018.pdf ae712d0ceb808eed51c4b42e61cd525b MD5 1 10259/5779 oai:riubu.ubu.es:10259/5779 2024-07-25 09:26:31.212 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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