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PREPARATION OF Ni-Pt/La2O3 CATALYST AND ITS KINETICS STUDY OF HYDROUS HYDRAZINE FOR HYDROGEN GENERATION |
Yujie ZHONG1,Hongbin DAI2(),Ping WANG2 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China |
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Cite this article:
Yujie ZHONG,Hongbin DAI,Ping WANG. PREPARATION OF Ni-Pt/La2O3 CATALYST AND ITS KINETICS STUDY OF HYDROUS HYDRAZINE FOR HYDROGEN GENERATION. Acta Metall Sin, 2016, 52(4): 505-512.
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Abstract Safe and efficient hydrogen storage remains a grand challenge in the widespread implementation of hydrogen fuel cell technology. Recently, chemical hydrogen storage has emerged as a promising alternative for vehicular and portable applications. A number of hydrogen-rich materials have been experimentally demonstrated to deliver large amounts of hydrogen under mild conditions with controllable kinetics. Among these materials of interest, hydrous hydrazine (N2H4H2O) is a promising but yet not fully explored candidate. The development of highly efficient catalyst and its reaction kinetics law are the key issues of N2H4H2O-based hydrogen generation (HG) systems. Herein, a supported Ni-Pt/La2O3 catalyst was prepared by a combination of co-precipitation and galvanic replacement methods. Via optimizing preparing processes, the developed catalyst enabled a complete decomposition of N2H4H2O to generate H2 at a reaction rate of 340 h-1 at 323 K, which outperforms most reported N2H4H2O decomposition catalysts. Phase/structural analyses by XRD, TEM and XPS were carried out to gain insight into the catalytic performance of the Ni-Pt/La2O3 catalyst. In addition, the effects of temperature, concentration of N2H4H2O and NaOH, and amount of catalyst on the N2H4H2O decomposition were investigated over the Ni-Pt/La2O3 catalyst. The kinetic rate equation may be represented by the expression: r = -d[N2H4H2O]/dt = 2435exp(-51.53/(RT))[N2H4H2O]0.3[NaOH]0(0.12)[Ni]1.03. The obtained results should lay the experimental and theoretical foundation for developing practical application of N2H4H2O-based HG system.
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Received: 15 October 2015
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Fund: Supported by National Outstanding Youth Science Foundation of China (No.51125003) and National Natural Science Foundation of China (No.51471168) |
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