Abstract

The formation of soot (coke) on the surface of a structured Rh/Ce_0.75Zr_0.25O₂/Al₂O₃/FeCrAl catalyst in the course of autothermal reforming of diesel fuel into synthesis gas was studied. The SEM analysis revealed the formation of fibrous carbon particles of 5–50 µm in size on the catalyst surface. It was found that the process of coke formation occurred on the catalytic coating surface and caused no exfoliation and/or damage of the catalytic layer; the carbon deposits were readily oxidized during catalyst regeneration by oxygen or water vapor. Intense oxidation of soot with oxygen began at a temperature of 450°C; a major portion of carbon deposits was oxidized even before the reactor furnace reached an operating temperature of the autothermal reforming of diesel fuel (750°C). Water vapor also oxidized carbon deposits but less efficiently than oxygen. The catalyst regeneration with water vapor proceeded actively at a temperature of 750°C, and this fact indicated the possibility of catalyst self-regeneration in the autothermal reforming of diesel fuel, which is performed with an excess of water.

中文翻译：

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柴油自热重整后 Rh/Ce0.75Zr0.25O2 – δ/θ-Al2O3/FeCrAl 催化剂的再生

摘要

_{在结构化 Rh/Ce 0.75} Zr _0.25 O ₂ /Al ₂ O ₃表面形成烟灰（焦炭）/FeCrAl催化剂在柴油自热重整制合成气过程中的应用进行了研究。SEM 分析显示在催化剂表面形成了尺寸为 5–50 µm 的纤维状碳颗粒。发现焦炭形成过程发生在催化涂层表面并且没有引起催化层的剥落和/或损坏；在催化剂再生过程中，碳沉积物很容易被氧气或水蒸气氧化。在 450°C 的温度下开始用氧气强烈氧化烟灰；甚至在反应炉达到柴油自热重整的操作温度（750°C）之前，大部分积碳就被氧化了。水蒸气也氧化碳沉积物，但效率低于氧气。