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Enhanced dehydrogenation of nanoscale MgH_2 confined by ordered mesoporous silica

机译:有序介孔二氧化硅限制的纳米级MgH_2的增强脱氢

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摘要

Nanoscale MgH_2 was synthesized through loading di-n-butylmagnesium (MgBii2) solution into the pores of ordered mesoporous silicas (SBA-15) with a pore diameter in a range of 5-10 nm, followed by freeze drying and hydrogenation treatment. The MgBu_2 inside the pore channels of SBA-15 decomposed into MgH_2 upon hydrogenation at 493 K under 6 MPa hydrogen. The nanoconfined MgH_2 exhibited greatly decreased desorption temperature of 540 K, a reduction of 146 K in comparison with that of commercial MgH_2, or 65 K reduction relative to that of MgH_2 obtained from MgBu_2 without confinement. Moreover, lower desorption temperature for the MgH_2 supported by SBA-15 with smaller pore diameter. The improvement on the dehydrogenation properties of MgH_2 was attributed to the nanosizing effect induced by the nanoconfinement of mesoporous silica.
机译:通过将二正丁基镁(MgBii2)溶液装入孔径在5-10 nm范围内的有序介孔二氧化硅(SBA-15)的孔中,然后进行冷冻干燥和氢化处理,来合成纳米级MgH_2。 SBA-15孔道内的MgBu_2在6 MPa氢气下于493 K氢化时分解为MgH_2。纳米约束的MgH_2的解吸温度大大降低了540 K,比市售MgH_2降低了146 K,或者相对于未经限制的MgBu_2所获得的MgH_2降低了65K。此外,孔径较小的SBA-15负载的MgH_2的解吸温度较低。 MgH_2脱氢性能的提高归因于介孔二氧化硅纳米限制所引起的纳米化作用。

著录项

  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|146-150|共5页
  • 作者单位

    School of Materials Science and Engineering, South China of University of Technology, Guangzhou 510641, China;

    School of Materials Science and Engineering, South China of University of Technology, Guangzhou 510641, China;

    School of Materials Science and Engineering, South China of University of Technology, Guangzhou 510641, China;

    School of Materials Science and Engineering, South China of University of Technology, Guangzhou 510641, China,Key Laboratory of Fuel Cell Technology of Guangdong Province, South China University of Technology, Guangzhou 510641, China;

    School of Materials Science and Engineering, South China of University of Technology, Guangzhou 510641, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hydrogen storage; MgH_2; mesoporous silica; nanoconfinement;

    机译:储氢MgH_2;介孔二氧化硅纳米约束;

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