综合采用共沉淀和置换法制备了一种La2O3负载纳米级Ni-Pt合金催化剂Ni-Pt/La2O3. 经优化制备工艺, 该催化剂在323 K可100%催化N2H4H2O分解制氢, 反应速率340 h-1, 其催化性能优于已报道的多数催化剂. 此外, 还对N2H4H2O催化分解制氢反应动力学进行了研究, 得到其反应动力学方程为: r = -d[N2H4H2O]/dt = 2435exp(-51.32/(RT)) [N2H4H2O]0.3[NaOH]0(0.12)[Ni]1.03. 研究结果对于促进N2H4H2O分解制氢体系的实际应用奠定了基础.
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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