2D NiFe/CeO2 Basic-Site-Enhanced Catalyst via in-Situ Topotactic Reduction for Selectively Catalyzing the H2
Dandan Wu1, Ming Wen1, Chen Gu1
1School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China.
Abstract:
An economical catalyst with excellent selectivity and high activity is eagerly desirable for H2 generation from the decomposition of N2H4·H2O. Here, a bifunctional two-dimensional NiFe/CeO2 nanocatalyst with NiFe nanoparticles (∼5 nm) uniformly anchored on CeO2 nanosheets supports has been successfully synthesized through a dynamic controlling coprecipitation process followed by in-situ topotactic reduction. Even without NaOH as catalyst promoter, as-designed Ni0.6Fe0.4/CeO2 nanocatalyst can show high activity for selectively catalyzing H2 generation (reaction rate (molN2H4 mol-1NiFe h-1): 5.73 h-1). As ceria is easily reducible from CeO2 to CeO2-x, the surface of CeO2 could supply an extremely large amount of Ce3+, and the high-density electrons of Ce3+ can work as Lewis base to facilitate the absorption of N2H4, which can weaken the N-H bond and promote NiFe active centers to break the N-H bond preferentially, resulting in the high catalytic selectivity (over 99%) and activity for the H2 generation from N2H4·H2O.
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