Supported nickel–iron nanocomposites as a bifunctional catalyst towards hydrogen generation from N2H4·H2O

Noble-metal-free NiFeMo nanocatalyst for hydrogen generation from the decomposition of hydrous hydrazine

“…3a, e- Fig. 45 The initial TOF over Ni 0.6 Fe 0.4 Mo is measured to be 28.8 h À1 [eqn (S1) †] at 323 K. To the best of our knowledge, this initial TOF value is much higher than the most widely reported noble-metal-free heterogeneous catalysts for N 2 H 4 $H 2 O decomposition, [26][27][28][29][30][31] and is even superior to most of those noble-metal-containing catalysts (Table S1 †). Noteworthy, a change in the molar ratio of Ni : Fe : Mo to some other values results in a serious decrease in its activity or selectivity (Fig.…”

“…27,38 To solve this problem, non-noble-metal nanomaterials have gained more and more research interest for the selective decomposition of N 2 H 4 $H 2 O. [26][27][28][29][30][31][32][33] For example, it is found that, using hexadecyltrimethylammonium bromide (CTAB) as a surfactant, NiFe alloy nanoparticles could catalyze the complete dehydrogenation of N 2 H 4 $H 2 O at 343 K. 26 Meanwhile, supported nonnoble-metal nanocatalysts such as Ni-Al 2 O 3 -HT, 27 NiFe-alloy/ MgO, 29 Ni 3 Fe/C 32 and FeB/MWCNTS 33 are active for the same reaction at room temperature. Thus, various surfactants or particle supports have been applied during the syntheses of these nanocatalysts.…”

“…Thus, various surfactants or particle supports have been applied during the syntheses of these nanocatalysts. 27,29,32,33 More importantly, most of the catalytic activities of the reported non-noble-metal nanomaterials for the dehydrogenation of N 2 H 4 $H 2 O are still very low. However, the usage of surfactants sometimes decreases the catalytic performance due to more or less occupation of the active sites on the surface of the nanocatalysts by surfactants.…”

Carbon dioxide catalytic conversion to nano carbon material on the iron–nickel catalysts using CVD-IP method

“…The calculated mean iron granule diameter was 25.22 m for the FNi0 sample without Ni additive, and it decreased to 10.5-14.3 nm for the nickel promoted samples (FNi2, FNi4, FNi8, and FNi20). The Ni dopant could effectively downsize the iron grain, and such trend can be mainly associated with the strong synergy by the Fe-Ni alloying effect [26]. That is to say, the dispersion of active species was better by adding a certain amount of nickel additive.…”

Cyclic Dehydrogenation–(Re)Hydrogenation with Hydrogen‐Storage Materials: An Overview

“…246 The implementation of hydrous hydrazine as a hydrogen carrier is now strongly dependent on improvements concerning the GHSC and the stability/durability of the catalysts. The form of the catalyst is also of importance, as nanoparticles dispersed in solution are unsuitable for practical applications, but their immobilization over supports may be the solution 247. The exclusive occurrence of Reaction (9) is important, as it generates N 2 as a single byproduct, which is abundant in the atmosphere.…”