This work investigates the process of elimination of carbon deposits formed during the mixed reforming of methane mixture. The mixed reforming of methane to synthesis gas was studied over Ni/Al2O3 catalyst in the 650–750°C. The amount of carbon deposit on the surface of catalyst varied from 2.8 to 5.9%, depending on the reaction temperature. The reactivity of carbon species was evaluated in the oxygen, hydrogen, carbon dioxide, and water mixtures. The obtained results revealed the presence of highly active carbon form (etched at a temperature below 200 °C) and inactive form (gasification at a temperature above 500 °C). The SEM and Raman analyses confirmed the presence of carbon in the form of filaments. Among all investigated gasification agents, water vapor was found to be the most efficient in removing the carbon deposit due to better adsorption of water on the surface of aluminum oxide. The overall mechanism of mixed methane reforming along with carbon gasification was shown.

中文翻译：

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高效去除 Ni/Al2O3 混合甲烷重整过程中形成的积碳

这项工作研究了消除甲烷混合物混合重整过程中形成的积碳的过程。在 650-750°C 下，在 Ni/Al2O3 催化剂上研究了甲烷混合重整合成气。催化剂表面的积碳量从 2.8% 到 5.9% 不等，这取决于反应温度。在氧气、氢气、二氧化碳和水混合物中评估碳物质的反应性。所得结果表明存在高活性碳形式（在低于 200°C 的温度下蚀刻）和非活性形式（在高于 500°C 的温度下气化）。SEM 和拉曼分析证实碳以细丝的形式存在。在所有调查的气化剂中，发现水蒸气在去除积碳方面最有效，因为水可以更好地吸附在氧化铝表面上。显示了混合甲烷重整与碳气化的整体机制。