QUANTITATIVE DETECTION OF REACTIVE HYDROGEN ON MOS2/GAMMA-AL2O3 AND ON GAMMA-AL2O3

Hydrogenation of 2-methyl-1,3-butadiene (isoprene) under helium flow in the absence of gaseous hydrogen is used to titrate reactive hydrogen species present in MoS2 supported on γ-Al2O3 previously submitted to a H2 treatment at various temperatures TR. MoS2/γ-Al2O3 is found to be a hydrogen reservoir and the hydrogen storage depends on the temperature of treatment (TR) of the solid under H2, i.e., on the creation of anionic vacancies on the edges of the supported MoS2 slabs. A similar result has been obtained on a powdered bulk MoS2, which has been investigated by the same dynamic method, but the amount of titrated reactive hydrogen was much lower. Therefore, in the case of MoS2/γ-Al2O3 the role of the support in the reactive hydrogen storage is illustrated and also explained by the creation of anionic vacancies in the oxide phase. © 1990.