Preparation and Catalytic Activity of a Novel Nanocrystalline ZrO2@C Composite for Hydrogen Storage in NaAlH4
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- 作者：Xin Zhang ; Ruyan Wu ; Zeyi Wang ; Prof. Mingxia Gao ; Prof. Hongge Pan and Prof. Yongfeng Liu
- 刊名：Chemistry – An Asian Journal
- 出版年：2016
- 出版时间：December 19, 2016
- 年：2016
- 卷：11
- 期：24
- 页码：3541-3549
- 全文大小：2453K
- ISSN：1861-471X
文摘
Sodium alanate (NaAlH4) has attracted intense interest as a prototypical high-density hydrogen-storage material. However, poor reversibility and slow kinetics limit its practical applications. Herein, a nanocrystalline ZrO2@C catalyst was synthesized by using Uio-66(Zr) as a precursor and furfuryl alcohol (FA) as a carbon source. The as-synthesized ZrO2@C exhibits good catalytic activity for the dehydrogenation and hydrogenation of NaAlH4. The NaAlH4-7 wt % ZrO2@C sample released hydrogen starting from 126 °C and reabsorbed it starting from 54 °C, and these temperatures are lower by 71 and 36 °C, respectively, relative to pristine NaAlH4. At 160 °C, approximately 5.0 wt % of hydrogen was released from the NaAlH4-7 wt % ZrO2@C sample within 250 min, and the dehydrogenation product reabsorbed approximately 4.9 wt % within 35 min at 140 °C and 100 bar of hydrogen. The catalytic function of the Zr-based active species is believed to contribute to the significantly reduced operating temperatures and enhanced kinetics.