Facile synthesis by polyol method of a ruthenium catalyst supported on γ-Al2O3 for hydrolytic dehydrogenation of ammonia borane

In situ facile synthesis of ruthenium nanocluster catalyst supported on carbon black for hydrogen generation from the hydrolysis of ammonia-borane

“…From the slope of the straight line, the activation energy (Ea) for the hydrolysis of AB was estimated. Although the Ea value of 34.81 AE 0.12 kJ mol À1 in our experiment is higher than that (Ea ¼ 23 kJ mol À1 ) reported for Ru/g-Al 2 O 3 [10], it is lower than that of most other Ru catalysts: 54 AE 2 kJ mol À1 for poly(4-styrenesulfonic acid-co-maleic acid) stabilized Ru nanoclusters [13]; 47 AE 2 kJ mol À1 for laurate-stabilized Ru nanoclusters [14]; 76 AE 0.1 kJ mol À1 for carbon supported commercial Ru [15]; 67 kJ mol À1 for Ru and RuO 2 supported over g-Al 2 O 3 [16]. This further proves that the in situ synthesized Ru/C catalysts are very promising candidates for the hydrolysis of AB.…”

Ruthenium nanoparticles supported over carbon thin film catalyst synthesized by pulsed laser deposition for hydrogen production from ammonia borane

“…Almost all the catalysts reported in the past for hydrolysis of AB are in the form of powder including those supported on certain substrates [7,11,15,[22][23][24][25][26][27][28][29][30]40]. The major problem with this form is that catalysts cannot be easily recovered.…”

“…10) gives an activation energy value of about 28 kJ mol -1 . This value is lower than that reported in the literature for noble metal catalysts like Ru (47 kJ mol -1 ) [7] and Rh (67 kJ mol -1 ) nanoclusters [5], Pd nanoclusters (44 kJ mol -1 ) [30], Ru/C (34.8 kJ mol -1 ) [11], Ru supported over MWCNT (33kJ mol -1 ) [40], Ru(acac) 3 (48 kJ mol -1 ) [27], Ru/γ-Al 2 O 3 (67 kJ mol -1 ) [26],and K 2 PtCl 6 (86 kJ mol -1 ) [12]. The activation energy value obtained in the present case is also lower than that obtained by other catalysts such as NiAg (51.5 kJ mol -1 ) [13], Co/γ-Al 2 O 3 (62 kJ mol -1 ) [16], Co-Mo-B/ Ni foam (44 kJ mol -1 ) [48], and Co (0) nanoclusters (46 kJ mol -1 ) [8].…”

“…However, recently, Ru-based catalysts are highly investigated for hydrolysis of AB namely: ruthenium (0) nanoparticles (NPs) supported on hydroxyapatite [22], bimetallic-based RuCo and RuCu alloy supported on -Al 2 O 3 [23], graphene supported Ru NPs [24], water soluble laurate-stabilized ruthenium (0) nanoclusters catalyst [7], Ru/γ-Al 2 O 3 nanopowder [25,26], Ru(acac) 3 [27], Ni@Ru [28], NiRu alloy [29], and PSSA-co-MA stabilized ruthenium (0) nanocluster catalyst [30] etc. Nevertheless, all the catalysts used are in powder form which has the problem related to separation and aggregation during the course of the reaction.…”

Influence of preparation conditions on morphology of in-situ synthesized hollow ruthenium-silica composite spheres for hydrolytic dehydrogenation of ammonia borane

“…It is reported that ruthenium-based catalysts are highly active catalysts for this dehydrogenation reaction. Studies on catalysts for hydrogen generation from aqueous NH 3 BH 3 solution show that dispersion of active metals and/or the amorphous nature of the active phase could play an important role in catalytic performance [17][18][19][20][21][22].…”