Metal nanoparticles supported on crystalline Al( OH ) ₃ Nano sheets for efficient catalytic hydrogen production from hydrous hydrazine in aqueous solution

Abstract

Summary Hydrous hydrazine (N2H4∙H2O) has been considered a promising chemical hydrogen storage carrier compound due to its high hydrogen content and easy recharge as a stable liquid for transportation. NiPt, CoPt, and CoNi nanoparticles (NPs) supported on Al(OH)3 Nano sheets are prepared in this research for hydrogen production by N2H4∙H2O catalytic decomposition. Experimental results indicated that the prepared NiPt, CoNi, and CoPt NPs have superior catalytic efficiency than that of published catalysts for the N2H4∙H2O dehydrogenation. It approximately released 3 Equiv. (H2 + N2) corresponding with TOF values of 1280, 359, and 342 hours−1 at 298 K, respectively. Prepared NiPt‐Al(OH)3 and CoPt‐Al(OH)3 possess good paramagnetic characteristics and can be easy to separate and reuse by a magnet. Meanwhile, prepared catalysts also perform good recyclability and approximately 100% selectivity after five durability tests. The crystallinity and amorphous phase percentage of NiPt‐Al(OH)3, CoNi/Al(OH)3, and CoPt/Al(OH)3 were ranged from 4.29% to 15.18% and from 84.82% to 95.72%, respectively. The catalytic performance of these above catalysts can be recognized by the electronic interaction between the Al(OH)3 Nano sheet and Ni, Co, and Pt NPs. Meanwhile, the Al(OH)3 Nano sheet surface could provide strong basic active sites with corresponding synergistic cooperative influences between ultra‐fine monometallic and bimetallic NPs and Al(OH)3 Nano sheets. In summary, the prepared Ni, Co, and Pt‐based catalysts have been developed for the application of N2H2∙H2O dehydrogenation as a favorable hydrogen storage material.

Anatase-Type TiO2-Modified Amorphous NiMo Nanoparticles with Superior Catalytic Performance toward Dehydrogenation of Hydrous Hydrazine

“…Therefore, it is necessary to develop a new catalyst that can efficiently reduce the cleavage energy barrier of the N–H bond and promote the dehydrogenation of N 2 H 4 ·H 2 O along complete decomposition routes (eq ). Recent studies have shown that noble metal catalysts can completely decompose N 2 H 4 ·H 2 O via eq under moderate conditions with superior catalytic activity. − However, the practical application of precious metal catalysts is hindered by their high cost and limited resources. To date, some noble metal-free catalysts have shown 100% H 2 selectivity, but their catalytic activities are sluggish. − Therefore, the development of non-noble catalysts with high selectivity, low cost, and excellent catalytic activity is crucial for the practical application of N 2 H 4 ·H 2 O as a promising online hydrogen source.…”

Mn‐Modified Graphitic Carbon Nitride‐Supported Bimetallic PtNi Nanoparticles for Hydrogen Generation from Hydrous Hydrazine

“…[18,19] In order to avoid the generation of ammonia, developing high selectivity and long-term stability catalysts is crucial for the practical application of hydrous hydrazine. [20][21][22][23] Up to now, many studies have been reported to confirm that metal active components in catalysts make important effect on promoting the dehydrogenation of hydrous hydrazine. [24][25][26][27] Among them, noble metal based (e. g. Pt, Rh, Pd) nano-catalysts have been reported for dehydrogenation of hydrous hydrazine, especially for the Pt-based nano-catalysts with excellent catalytic performance at mild reaction condition.…”

“…Generally, the complete decomposition of hydrous hydrazine would produce two molecules of hydrogen without any solid by‐products (only nitrogen) (N 2 H 4 (l)→N 2 (g)+2H 2 (g)), while the undesired side reaction process may produce NH 3 (3 N 2 H 4 (l)→N 2 (g)+4NH 3 (g)), which will poison catalyst and hinder the reaction [18,19] . In order to avoid the generation of ammonia, developing high selectivity and long‐term stability catalysts is crucial for the practical application of hydrous hydrazine [20–23] …”