Study of formation mechanism of Ni-Pt/CeO2 catalyst for hydrogen generation from hydrous hydrazine

Developing advanced catalysts ideally requires fundamental knowledge of the chemical and physical transformations occurred in the preparation process of the catalysts. Herein, we report a careful study of the formation mechanism of bimetallic nickel-platinum (Ni-Pt) nanocatalyst supported on ceria (...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-05, Vol.787, p.1187-1194
Main Authors: Shi, Qing, Qiu, Yu-Ping, Dai, Hao, Wang, Ping
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Alloying
Bimetallic catalyst
Bimetals
Catalysis
Catalysts
Cerium oxides
Chemical synthesis
Cobalt
Composition effects
Coprecipitation
Hydrazines
Hydrogen production
Hydrogen storage
Hydrous hydrazine
Nickel
Organic chemistry
Phase evolution
Platinum
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Summary:Developing advanced catalysts ideally requires fundamental knowledge of the chemical and physical transformations occurred in the preparation process of the catalysts. Herein, we report a careful study of the formation mechanism of bimetallic nickel-platinum (Ni-Pt) nanocatalyst supported on ceria (CeO2), which was prepared by co-precipitation method. A combination of phase/structure/chemical state analyses show that the preparation process of the catalyst involves the formation of [(CH3)4N]2PtCl6 and CeNi0.5Ox phases in the co-precipitation step and their phase evolution in the subsequent aging and reduction steps. The conversion of [(CH3)4N]2PtCl6 to metallic Pt in the aging step is a key event in the preparation process, which exerts profound effects on the composition, microstructural feature and accordingly the catalytic property of the catalyst. These results clearly describe the formation mechanism of Ni-Pt/CeO2 catalyst, which should be significant for the rational design and controlled synthesis of high-performance catalysts for chemical hydrogen storage/generation. [Display omitted] •The Ni-Pt/CeO2 catalyst is prepared via co-precipitation method.•The formation mechanism of Ni50Pt50/CeO2 catalyst was investigated systematically.•The evolution of [(CH3)4N]2PtCl6 and CeNi0.5Ox phases was a key event.•The results may lay foundation for the synthesis of high-performance catalysts.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.01.378