Room temperature conversion of Mg to MgH2 assisted by low fractions of additives

Autor(es)

Antiqueira, F. J. ^[1] ; Leiva, D. R. ^[2] ; Zepon, G. ^[2] ; Botta, W. J. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn PPGCEM, Rod Washington Luiz, Km 235, SP-310, BR-13565905 Sao Carlos, SP - Brazil

^[2] Fed Univ Sao Carlos DEMa UFSCar, Dept Mat Engn, Rod Washington Luiz, Km 235, SP-310, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 47, n. 1, p. 470-489, JAN 1 2022.
• Citações Web of Science: 0

Resumo

In recent works, it was noticed that Mg/MgH2 mixed with additives by high energy ball milling allows temperature reductions of H-2 absorption/desorption without necessarily changing thermodynamic properties. Thus, the objective of this work was to investigate which additives, mixed in low fractions with MgH2 powder would act as efficient hydrogen absorption/desorption catalysts at low temperatures, mainly at room temperature (RT). MgH2 mixtures with 2 mol% additives (Fe, Nb2O5 , TiAl and TiFe) were prepared by high energy reactive ball milling (RM). MgH2-TiFe mixture showed the best results, both during desorption at 330 degrees C and absorption at RT. The hydrogen absorption was approximate to 2.67 wt% H-2 in 1 h and approximate to 4.44 wt% H-2 in 16 h (40% and 67% of maximum theoretical capacity, respectively). The MgH2 -TiFe superior performance was attributed to the hydrogen attraction by the created high energy interfaces and strong TiFe catalytic action facilitating the H-2 flow during Mg/MgH2 reactions. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático