Abstract The carbon structure of char as catalysts is very crucial as it greatly governs the catalytic activity of char for tar reforming reactions. More importantly, the char structure also plays an important role in affecting the interactions between the inherent metal species and carbon atoms, thus affecting the catalytic performances. This study aims to investigate the effects of char structure on the reforming of tar derived from the gasification and pyrolysis of Shengli brown coal. Chars prepared from five kinds of acid-washed carbonaceous materials, including biomass, brown coal, bituminous coal, anthracite and graphite, were used as tar reforming catalysts in this work. The different effectiveness of H-form char catalysts from the different ranking carbon materials have clearly shed light on the effects of char structure on tar reforming. Results show that the chars from biomass and low rank coals featured obviously higher catalytic activity than those from high rank fuels. The variation in char structure that was revealed by FT-Raman has greatly exerted impacts on tar yields as well as tar compositions. Interestingly, the supply of steam (in the gasification condition) did not always see the reduction in tar yields, very much depending on the type of char catalysts used in the experiments.

中文翻译：

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褐煤热解气化焦油催化重整：母炭材料对炭催化剂性能的影响

摘要 作为催化剂的焦炭的碳结构非常重要，因为它极大地控制了焦油重整反应中焦炭的催化活性。更重要的是，炭结构在影响固有金属物种与碳原子之间的相互作用方面也起着重要作用，从而影响催化性能。本研究旨在研究炭结构对胜利褐煤气化热解焦油重整的影响。以生物质、褐煤、烟煤、无烟煤和石墨等5种酸洗含碳材料为原料制备的焦炭作为焦油重整催化剂。来自不同等级碳材料的 H 型炭催化剂的不同有效性清楚地揭示了炭结构对焦油重整的影响。结果表明，生物质和低阶煤的焦炭比高阶燃料的焦炭具有明显更高的催化活性。FT-Raman 揭示的炭结构变化对焦油产率和焦油组成产生了很大影响。有趣的是，蒸汽的供应（在气化条件下）并不总是看到焦油产量的降低，这在很大程度上取决于实验中使用的炭催化剂的类型。