NiIr Nanoparticles Immobilized on the Pores of MIL-101 as Highly Efficient Catalyst toward Hydrogen Generation from Hydrous Hydrazine

Abstract

Highly dispersed ultrafine NiIr nanoparticles with different compositions were successfully encapsulated into the cavities of MIL-101 and applied to catalyze the dehydrogenation of hydrazine monohydrate. The catalytic activities relied on the composition of metals, support materials, alkaline, as well as the temperature strongly. Among all the catalysts tested, Ni 85 Ir 15 @MIL-101 exhibited the highest catalytic performance in the presence of NaOH at 50°C. Even at 25°C, the Ni 85 Ir 15 @MIL-101 exhibited the complete dehydrogenation of hydrazine with a turnover frequency value of 24 h −1 .

Ruthenium Complexes for Catalytic Dehydrogenation of Hydrazine and Transfer Hydrogenation Reactions

“…Further performing the catalytic reaction at lower temperatures (<80 °C), TON and TOF of the catalytic dehydrogenation of hydrazine were significantly decreased (Table , entries 10–14). The apparent activation energy (Ea=57.9 kJ mol −1 ) for the catalytic dehydrogenation of hydrazine over [Ru]‐1 catalyst, as obtained by an Arrhenius plot (Figure c (inset) and Figure S3), is in good agreement with other literature findings …”

“…Further in the search of a suitable solvent medium, [Ru]‐1 catalyzed dehydrogenation of hydrazine was performed in THF‐methanol (10:1 v/v) at 80 °C in the presence of different bases KOH, NaOH and KO t Bu, where highest TON and TOF was achieved with KO t Bu (Table , entries 5–7). Based on the amount of gas evolved, selectivity for H 2 gas (X) was found to be 0.46 . Moreover, the presence of H 2 in the released gas was also analysed by GC‐TCD (Figure S1).…”

Tuning the Surface Composition of Ni/meso‐CeO2 with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

“…If the Ir/Ni molar ratio was increased to 1/6.53, the catalyst showed an optimal catalytic property; this enabled complete decomposition of N 2 H 4 ⋅ H 2 O to generate H 2 at a reaction rate of 343 h −1 at 50 °C. This catalytic performance compares favorably with those of Ni−Ir bimetallic catalysts reported to date . Further increasing the Ir/Ni ratio to 1/3.83 results in a slightly increased activity, but reduced H 2 selectivity from 100 to 91 %.…”

“…In the past decade, significant progresses has been made in developing active and selective catalysts for promoting H 2 generation from N 2 H 4 ⋅ H 2 O. It was found that alloying Ni with noble metals, such as Pt, Ir, Rh, or Pd, resulted in remarkable improvement to the catalytic activity and H 2 selectivity . In particular, immobilized Ni−Pt or Ni−Ir alloy nanoparticles on alkaline metal oxides (e.g., CeO 2 , La 2 O 3 ) enabled the complete decomposition of N 2 H 4 ⋅ H 2 O at mild temperatures with 100 % H 2 selectivity .…”

Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

“…38 The solution temperature was set to 30°C using cycling water. Typically, the NaOH solution (4 ml, 0.5 M) containing an amount of catalyst was placed in a three-necked round-bottom flask.…”