Catalytic effect and hydrogen reaction mechanism of Ti doped in NaAlH4 were elaborated in this paper, and current viewpoints about Ti active species in hydrogen reaction were discussed. In a further step, the possibil...Catalytic effect and hydrogen reaction mechanism of Ti doped in NaAlH4 were elaborated in this paper, and current viewpoints about Ti active species in hydrogen reaction were discussed. In a further step, the possibility and practicality of the hydrogen reaction mechanism of Ti-doped NaAlH_4 were elucidated. They could be summarized as follows: while the current theory about the hydrogen reaction mecha-nism of Ti-doped NaAlH_4 should be further improved and modified, the research on Ti-doped NaAlH_4 would be a recommendable pattern for the catalyst research in other metal complex hydrides.展开更多
The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),sc...The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM) and Sievert's technology test. It is observed that Ti-Zr hydride doped NaAlH4 discharges 2.7% and 4.0%(mass fraction) of hydrogen in 40 min and 11 h at 160 ℃,respectively,and keeps its reversible dehydrogenation capacity at 4.0%(mass fraction) after 10 hydrogenation/dehydrogenation cycles. These results show the Ti-Zr hydride doped NaAlH4 has good reversible hydrogen storage capacity and kinetics. XRD and SEM investigations also show that the doped Ti-Zr hydride uniformly distributes in NaAlH4 substrate and keeps stable during the hydrogenation/dehydrogenation cycle,indicating that Ti-Zr hydride plays the main surface-catalytic role on improving reversible hydrogen storage properties of NaAlH4.展开更多
文摘Catalytic effect and hydrogen reaction mechanism of Ti doped in NaAlH4 were elaborated in this paper, and current viewpoints about Ti active species in hydrogen reaction were discussed. In a further step, the possibility and practicality of the hydrogen reaction mechanism of Ti-doped NaAlH_4 were elucidated. They could be summarized as follows: while the current theory about the hydrogen reaction mecha-nism of Ti-doped NaAlH_4 should be further improved and modified, the research on Ti-doped NaAlH_4 would be a recommendable pattern for the catalyst research in other metal complex hydrides.
基金Projects(2006AA05Z131 2006AA05Z144) supported by the National High-Tech Research and Development Program of China
文摘The as-prepared Ti-Zr hydride powder is used as dopant to improve hydrogen storage properties of NaAlH4 upon mechanical milling under argon atmosphere. The as-milled sample is investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM) and Sievert's technology test. It is observed that Ti-Zr hydride doped NaAlH4 discharges 2.7% and 4.0%(mass fraction) of hydrogen in 40 min and 11 h at 160 ℃,respectively,and keeps its reversible dehydrogenation capacity at 4.0%(mass fraction) after 10 hydrogenation/dehydrogenation cycles. These results show the Ti-Zr hydride doped NaAlH4 has good reversible hydrogen storage capacity and kinetics. XRD and SEM investigations also show that the doped Ti-Zr hydride uniformly distributes in NaAlH4 substrate and keeps stable during the hydrogenation/dehydrogenation cycle,indicating that Ti-Zr hydride plays the main surface-catalytic role on improving reversible hydrogen storage properties of NaAlH4.
