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首页> 外文期刊>Catalysis Today >The study of the performance of Ni-based catalysts obtained from LaNiO3 perovskite-type oxides synthesized by the combustion method for the production of hydrogen by reforming of ethanol
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The study of the performance of Ni-based catalysts obtained from LaNiO3 perovskite-type oxides synthesized by the combustion method for the production of hydrogen by reforming of ethanol

机译：燃烧法合成的LaNiO3钙钛矿型氧化物制备的镍基催化剂的性能研究，通过乙醇重整制氢

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摘要

The performance of Ni-based catalysts synthesized by the combustion method, using different fuel-to-oxidizers ratios (φ), for ethanol conversion reactions was investigated. All catalysts were selective to hydrogen for steam reforming (SR) of ethanol. Regardless of the φ value, all catalysts deactivated during SR of ethanol at 773 K. Scanning electron microscopy and thermogravimetric analyses showed that the loss of activity was due to carbon deposition. However, decreasing φ reduced the amount of carbon formed. This was related to the smaller crystallite size of metallic Ni obtained for the sample with lower φ, as revealed by X-ray diffraction experiments. On the other hand, the catalysts were very stable at high reaction temperature (10731<). The occurrence of the reverse of Boudouard reaction and the carbon gasification reaction inhibited carbon deposition. Furthermore, the presence of water or oxygen in the feed promoted the mechanism of carbon removal and catalyst stability.
机译：研究了通过燃烧方法合成的镍基催化剂在不同燃料/氧化剂比（φ）下用于乙醇转化反应的性能。所有催化剂都对氢气具有选择性，可用于乙醇的蒸汽重整（SR）。不管φ值如何，在SR于773 K乙醇反应期间，所有催化剂均失活。扫描电子显微镜和热重分析表明，活性降低是由于碳沉积。但是，减小φ会减少形成的碳量。 X射线衍射实验表明，这与为φ较低的样品获得的金属Ni的晶粒尺寸较小有关。另一方面，催化剂在高反应温度（10731 <）下非常稳定。 Boudouard反应和碳气化反应反向发生的现象抑制了碳的沉积。此外，进料中水或氧气的存在促进了碳去除和催化剂稳定性的机制。

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