水合肼制氢Ni-Pt/La 2 O 3 催化剂研制及其反应动力学研究 *
摘要
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 (N2H4·H2O) 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 N2H4·H2O-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 N2H4·H2O to generate H2 at a reaction rate of 340 h at 323 K, which outperforms most reported N2H4·H2O 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 N2H4· H2O and NaOH, and amount of catalyst on the N2H4·H2O decomposition were investigated over the Ni-Pt/La2O3 cat*国家杰出青年基金项目51125003和国家自然科学基金项目51471168资助 收到初稿日期: 2015-10-15,收到修改稿日期: 2015-10-29 作者简介:钟玉洁,女, 1989年生,博士生 DOI: 10.11900/0412.1961.2015.00531 第505-512页 pp.505-512