Ni–Pt/CeO₂ Loaded on Granular Activated Carbon: An Efficient Monolithic Catalyst for Controlled Hydrogen Generation from Hydrous Hydrazine

Hydrous hydrazine (N 2 H 4 ·H 2 O) is considered to be a promising hydrogen carrier. In the development of a N 2 H 4 ·H 2 O-based hydrogen generation system, monolithic catalysts are highly desirable owing to their reusability, ready controllability of reaction, and simple design of hydrogen generator. Herein, we report the synthesis of a monolithic catalyst composed of Ni–Pt/CeO 2 nanoparticles and granular activated carbon using a simple impregnation–reduction method. It was found that the activity and H 2 selectivity of the resulting catalyst can be readily regulated by changing the annealing temperature and atmosphere. The optimal Ni–Pt/CeO 2 /GAC catalyst enabled complete and rapid decomposition of N 2 H 4 ·H 2 O to generate H 2 with a 100% selectivity at moderate temperature in the presence of 1 M NaOH. Importantly, by using this monolithic catalyst, we constituted a N 2 H 4 ·H 2 O-based HG system with a material-based hydrogen capacity as high as 6.54 wt %. This finding represents a promising step toward the development of N 2 H 4 ·H 2 O as a viable hydrogen storage carrier.