Desorption properties of mechanically milled MgH2 with double catalysts Ni and SiC

Abstract

The study of the MgH2 double-catalyzed Ni and SiC based storage system has been done. The objective of this study is to improve the hydrogen desorption temperature and the hydrogen desorption capacity. The material preparation was done through mechanical alloying technique. In this method, the milling of the material was carried out within 5 hours, 10 hours and 15 hours, with the ratio of the ball to the powder was and the speed of 350 rpm with the catalyst insertion catalyst by 5 wt% and 10 wt% SiC. Results from XRD measurements revealed that the sample was successfully reduced to a nanocrystal scale. The phase emerging from the XRD observation is the phase MgH2 as the main phase and followed by Ni and SiC phase as the minor phase. From the observation with SEM showing irregular particle shape, the particle size in the sample is not homogeneous because of the agglomeration effect and cold welding that causes the particle size to look large. The hydrogen release capacity was obtained in the samples which were milled for 10 hours at the weight of 5 wt% Ni-SiC catalyst with the release of 2.6 wt%. Based on observation with thermogravimetric analyzer (TGA), the lowest temperature was obtained in the samples which were milled 10 hours with catalyst 5 wt% SiC, which was 365 °C.

Nanomagnetite Extraction from Iron Sand Prepared by Mechanical Alloying Method

“…Important to note, by increasing milling time, the XRD diffraction peaks became broader. The decreases of relative intensity which affected the broader peak, mainly due to the reduction of the particles size and accumulation of microstrain [10][11][12][13]. The profile of iron sand before and after milling as shown in Figure 2, The iron sand profile before the milling process looks grayish, as a result there is still mixing with other associated minerals, especially SiO2.…”

Enhanced hydrogen storage kinetics of MgH2 by the synergistic effect of Mn3O4/ZrO2 nanoparticles

“…4,5 Unfortunately, the high thermodynamic stability, slow reaction kinetics, and low characteristic thermal conductivity hinder its practical applications. 6,7 Over the past few decades, several solutions to these obstacles have been developed, such as nanosizing, 8–10 catalyzing, 11–13 alloying, 14–16 and compositing. 17–19…”

“…4,5 Unfortunately, the high thermodynamic stability, slow reaction kinetics, and low characteristic thermal conductivity hinder its practical applications. 6,7 Over the past few decades, several solutions to these obstacles have been developed, such as nanosizing, [8][9][10] catalyzing, [11][12][13] alloying, [14][15][16] and compositing. [17][18][19] Recently, Mn-based catalysts have gained great attention as an alternative solution to enhance the hydrogen storage characteristics of MgH 2 .…”

Hydrogen Desorption Properties of MgH2 + 10 wt% SiO2 + 5 wt% Ni Prepared by Planetary Ball Milling

“…Therefore, in this study, a dual catalyst, namely natural silica and nickel, was used with a composition of the MgH2 + 10 wt% SiO2 + 5 wt% Ni. Double catalysts have been used in several study of the MgH2 to find out the excellent synergistic catalytic mechanism [12,[22][23][24]. However, as far as the author searches, research using a similar catalyst and composition has never been carried out by other researchers.…”