Abstract In-situ catalytic cracking of coal tar coupling with steam reforming of ethane (SRE) over activated carbon supported nickel (Ni/AC) was conducted to improve light tar yield. The results show that the content and yield of light tar (the fraction having boiling point below 360 °C) under ethane/steam reforming atmosphere increase by 58.7% and 62.2% with Ni/AC, respectively, and phenol oil raised by 112.5% compared with the non-upgrading tar. Compared with the upgrading process under N2, the benzenes and phenols in the tar gained from upgrading process under ethane/steam mixed atmosphere increases by 99.3% and 21.5%, specially, C3 alkyl substituted benzene and cresol increases from 2.2% and 9.2% to 5.1% and 15.0%. Meanwhile, when using deuterated ethane (C2D6) and deuterated water (D2O) as tracers, tar component with deuterium atom can be detected by GC/MS and 2H NMR. These reveal that Ni/AC can simultaneously catalyze coal tar cracking and SRE, thus the small radicals such as CHx, C2Hx and H generated from SRE can combine with the radicals from tar cracking to avoid excessive cleavage of tar. Coupled with the MS analysis of typical substances, the reaction mechanism of upgrading process was inferred.

中文翻译：

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煤热解焦油原位催化裂化和乙烷蒸汽重整碳基催化剂

摘要 为提高轻焦油产率，采用活性炭负载镍（Ni/AC）上煤焦油原位催化裂化与乙烷蒸汽重整（SRE）联用。结果表明，与Ni/AC相比，乙烷/蒸汽重整气氛下轻焦油（沸点低于360℃的馏分）的含量和收率分别提高了58.7%和62.2%，苯酚油分别提高了112.5%。与非升级tar。与N2提质工艺相比，乙烷/蒸汽混合气氛提质工艺得到的焦油中苯和酚类分别增加了99.3%和21.5%，特别是C3烷基取代苯和甲酚从2.2%和9.2%增加到5.1% % 和 15.0%。同时，当使用氘代乙烷 (C2D6) 和氘代水 (D2O) 作为示踪剂时，含氘原子的焦油组分可通过 GC/MS 和 2H NMR 检测。这表明Ni/AC可以同时催化煤焦油裂解和SRE，因此SRE产生的CHx、C2Hx和H等小自由基可以与焦油裂解产生的自由基结合，避免焦油过度裂解。结合典型物质的质谱分析，推测了提质过程的反应机理。