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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis
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In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis

机译：溶液燃烧合成原位制备高稳定性Ni基负载型催化剂

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摘要

Solution combustion synthesis (SCS) is typically used to produce nanostructured oxides and bulk metallic materials for a variety of application including catalysis. Here, we report in situ, one-step SCS of high surface area (155 m~2/g) Ni catalysts supported on fumed silica (SiO2). Time-resolved X-ray diffraction is used to investigate the dynamics of phase formation during combustion of nickel nitrate—glycine-ammonium nitrate reactive gels impregnated onto porous SiO2. It is shown that highly dispersed nickel nanoparticles (5 nm) formed in the reaction front are followed by their rapid oxidation by air oxygen. To prevent the undesired oxidation process, the synthesis was conducted in an inert atmosphere (argon, helium). It is demonstrated that low concentration oxygen impurity (less than 0.001 wt %) in the inert gas passivates the Ni nanoparticles through the formation of a thin amorphous oxide layer. The thus prepared Ni/SiO2 supported catalyst possesses high activity during the ethanol decomposition toward hydrogen at low temperatures (200 °C) and excellent stability toward deactivation with essentially no change of catalyst activity over 100 h of operation.
机译：固溶燃烧合成（SCS）通常用于生产纳米结构的氧化物和块状金属材料，用于包括催化在内的各种应用。在这里，我们就地报道了气相法二氧化硅（SiO2）上负载的高表面积（155 m〜2 / g）Ni催化剂的一步法SCS。时间分辨的X射线衍射用于研究硝酸镍-甘氨酸-硝酸铵反应性凝胶在多孔SiO2上的燃烧过程中相形成的动力学。结果表明，在反应前沿形成的高度分散的镍纳米粒子（5 nm）随后被空气氧快速氧化。为了防止不希望的氧化过程，合成是在惰性气氛（氩气，氦气）中进行的。已证明惰性气体中的低浓度氧杂质（小于0.001 wt％）通过形成薄的非晶氧化物层而使Ni纳米颗粒钝化。如此制备的Ni / SiO 2负载的催化剂在乙醇在低温（200℃）下对氢的分解过程中具有高活性，并且对失活具有优异的稳定性，在操作100小时内基本上没有催化剂活性的变化。

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