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Sol-gel based alumina powders with catalytic applications

机译：具有催化应用的溶胶-凝胶基氧化铝粉末

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摘要

The sol-gel process provides a new approach to the preparation of oxide materials and offers many advantages for making catalysts. Since homogeneous mixing can be achieved at the molecular scale, the chemical reactivity of the oxide surface can be greatly enhanced; thus powders with high surface area and optimized pore size distribution can be obtained at low temperatures. In the present work NiO/Al_2O_3 sol-gel catalysts were obtained by simultaneous gelation of aluminium isopropoxide and nickel nitrate. A comparative study with pure sol-gel alumina was also realized. By physical-structural studies the changes induced by the introduction of the Ni precursor, before and after aluminium alkoxide hydrolysis were highlighted. The introduction of Ni at the beginning of the reaction favors 7-Al_2O_3 crystallization. When Ni is added at the end of reaction, it delays the alumina crystallization and induces the disorder of the lattice. The obtained Ni doped sol-gel derived alumina has been used as catalyst in the finished form for glycerol reforming to generate H_2 for fuel cell applications. Some evaluation results of Ni-doped alumina combined with TiO_2 in photocatalytic glycerol reforming reaction have been included.
机译：溶胶-凝胶法提供了一种制备氧化物材料的新方法，并为制备催化剂提供了许多优势。由于可以在分子规模上实现均匀混合，因此可以大大提高氧化物表面的化学反应性；因此，可以在低温下获得具有高表面积和最佳孔径分布的粉末。在本工作中，NiO / Al_2O_3溶胶-凝胶催化剂是通过同时异丙醇铝和硝酸镍的凝胶化获得的。还实现了与纯溶胶-凝胶氧化铝的比较研究。通过物理结构研究突出了在烷氧基铝水解之前和之后引入Ni前驱体引起的变化。反应开始时引入Ni有助于7-Al_2O_3结晶。当在反应结束时添加Ni时，会延迟氧化铝的结晶并引起晶格混乱。所获得的Ni掺杂的溶胶-凝胶衍生的氧化铝已经以成品形式用作催化剂，用于甘油重整以生成用于燃料电池的H_2。包括了掺Ni的氧化铝和TiO_2在光催化甘油重整反应中的一些评价结果。

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  • 来源
    《Applied Surface Science》 |2011年第1期|p.448-455|共8页
  • 作者

    Maria Crisan; Maria Zaharescu; Valluri Durga Kumari; Machiraju Subrahmanyam; Dorel Crisan; Nicolae Dragan; Malina Raileanu; Mihaela Jitianu; Adriana Rusu; Gullapelli Sadanandam; Jakkidi Krishna Reddy;

  • 作者单位

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Catalysis and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Department of Chemistry, William Paterson University, 300 Pompton Road, Wayne, N] 07470, USA;

    Romanian Academy, Hie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independent, 060021, Bucharest, Romania;

    Catalysis and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India;

    Catalysis and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India;

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  • 正文语种 eng
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  • 关键词

    NiO/Al_2O_3 nanopowders; sol-gel process; structural study; catalytic activity; glycerol reforming;

    机译：NiO / Al_2O_3纳米粉;溶胶-凝胶法结构研究;催化活性;甘油重整;

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