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首页> 外文期刊>Journal of Materials Research >Mesoporous silica beads encapsulated with functionalized palladium nanocrystallites: Novel catalyst for selective hydrogen evolution
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Mesoporous silica beads encapsulated with functionalized palladium nanocrystallites: Novel catalyst for selective hydrogen evolution

机译：用功能化钯纳米微晶包封的中孔二氧化硅微珠：选择性析氢的新型催化剂

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摘要

2-(3,4 epoxycyclohexyl)emyltrimethoxysilane (EETMS)/3-glycidoxypropyltrimethoxysilane (GPTMS) mediated, in situ synthesis of functional palladium (Pd) nanocomposites over the graphene oxide (GO) surface is reported. The prepared nanocomposites viz, Pd/EETMS, Pd/GPTMS, Pd/GO/ EETMS, and Pd/GO/GPTMS, are encapsulated into mesoporous (2-10 nm) silica-alginate beads to primarily serve the development of cost-effective catalyst for on-board generation of hydrogen. Major findings involve: (i) the synthesis of porous silica alginate beads, with the controlled pore sizes (2-10 nm) as a function of concentration of alkoxysilanes, (ii) onboard release of hydrogen from the decomposition of hydrazine, which is evaluated as: (1) time-dependent disappearance of the N-N bond stretching band at 1069 cm-1 based on the FUR spectroscopy, (2) volumetric estimation of the equimolar hydrogen using methylene blue (MB); (3) catalytic reduction of p-nitroaniline (PNA). The decomposition of high concentration of hydrazine is made possible using very low concentration of palladium. On calcination the efficiency of catalysts found to enhance further. The noteworthy finding is probing the hydrogen evolution using FTIR spectroscopy. Hydrogen selectivity of ~ 100% is obtained from the most efficient catalyst (Pd/GO/EETMS-623 K).
机译：报道了2-（3,4-环氧环己基）戊基三甲氧基硅烷（EETMS）/ 3-环氧丙氧基丙基三甲氧基硅烷（GPTMS）介导的在氧化石墨烯（GO）表面上原位合成功能性钯（Pd）纳米复合材料。将制得的纳米复合材料即Pd / EETMS，Pd / GPTMS，Pd / GO / EETMS和Pd / GO / GPTMS封装到介孔（2-10 nm）硅藻酸盐微珠中，主要用于开发经济高效的催化剂用于船上产生氢气。主要发现包括：（i）多孔海藻酸二氧化硅微珠的合成，其孔径大小（2-10 nm）是烷氧基硅烷浓度的函数，（ii）肼分解过程中释放的氢被评估如：（1）基于FUR光谱的1069 cm-1处NN键拉伸带的时间依赖性消失，（2）使用亚甲基蓝（MB）的等摩尔氢的体积估计； （3）催化还原对硝基苯胺（PNA）。使用极低浓度的钯可以分解高浓度的肼。在煅烧时，发现催化剂的效率进一步提高。值得注意的发现是使用FTIR光谱探测氢的逸出。从最有效的催化剂（Pd / GO / EETMS-623 K）获得约100％的氢选择性。

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  • 来源
    《Journal of Materials Research》 |2017年第18期|3574-3584|共11页
  • 作者

    Prem Chandra Pandey; Shubhangi Shukla; Yashashwa Pandey;

  • 作者单位

    Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India;

    Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India;

    Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India;

  • 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);
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