Construction of bimetallic nanoparticles immobilized by porous functionalized metal-organic frameworks toward remarkably enhanced catalytic activity for the room-temperature complete conversion of hydrous hydrazine into hydrogen

A series of bimetallic NiPt and NiIr alloy nanoparticles (NPs) immobilized by metal-organic frameworks (MOFs) containing various functional groups were synthesized, and their catalytic performance on the complete conversion of hydrous hydrazine (H2NNH2 center dot H2O) into hydrogen was studied. Compared with the low active NiPt NPs immobilized by bare MIL-101 and MIL-101 functionalized by electron-accepting groups NO2 and SO3H, NiPt NPs immobilized by MIL-101 functionalized by electron-donating group NH2 exhibited high activity with turnover frequency (TOF) value of 137 h(-1) at 298 K, which was among the highest values of the reported heterogeneous catalysts. The different activities could be due to the different electron states of active NiPt NPs in the functionalized catalysts and the different interaction strength between H2NNH2 center dot H2O molecules and the functional groups in the MOF supports of catalysts. In addition, the compositions and pore structures of supports had significant effect on the catalytic activities of catalysts. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.