Jianmin Chen,Hongtao Zou,Qilu Yao,Minghong Luo,Xiugang Li,Zhang-Hui Lu
The development of highly active, stable, and inexpensive catalysts for efficient and complete dehydrogenation of hydrazine is highly attractive but still very challenging. Herein, Cr 2 O 3 -modified NiFe (NiFe-Cr 2 O 3 ) nanopartciles (NPs) have been designed as the heterogeneous catalyst. Both the catalytic activity and hydrogen selectivity of Ni 0.9 Fe 0.1 -Cr 2 O 3 NPs were improved remarkably as compared with those of their mono-metallic counterparts. The prepared Ni 0.9 Fe 0.1 -Cr 2 O 3 catalyst exhibited an outstanding catalytic activity to release 3.0 equiv. (H 2 + N 2 ) from hydrazine in only 8.5 min at 70 °C, providing a turnover frequency (TOF) value of 893.5 h −1 based on surface metal atoms. Systematic studies indicated that the small size and high surface area of Ni 0.9 Fe 0.1 -Cr 2 O 3 as well as the strong synergistic electronic effect between Cr 2 O 3 and NiFe NPs resulted in the excellent activity of Ni 0.9 Fe 0.1 -Cr 2 O 3 catalyst. Such a highly rapid, long term durability, and low cost catalyst may encourage greatly the practical application of hydrous hydrazine as a chemical hydrogen storage material.
RhP nanoparticles supported on reduced graphene oxide (RhP/rGO) synthesized by using a simple one-step wet-chemical approach have been investigated as superior catalysts toward dehydrogenation of hydrous hydrazine for chemical hydrogen storage . These RhP/rGO catalysts with different contents of P doping were characterized by ICP-AES, XRD , XPS , TEM, and STEM-HAADF. Thanks to the synergistic effect of phosphorous-doping, the obtained Rh 92.6 P 7.4 /rGO hybrid exhibits 100% H 2 selectivity, superior stability, and excellent catalytic performance with turnover frequency value (TOF) of 843.9 h −1 toward hydrogen generation from alkaline solution of hydrazine at 323 K.
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