低碳烷烃干重整（DRA）耦合煤热解（CP）过程可以有效提高热解焦油产率。使用Ni/La₂O₃-ZrO₂作为DRA催化剂，当La/Zr比为4∶1时，催化剂能够有效抑制DRA反应过程中积炭的生成，同时能够进一步提高重整耦合煤热解（CP -DRA）过程的焦油产率。本工作分析了CP-DRA的焦油组成和官能团分布，并与氮气中煤热解（CP-N₂）的焦油进行了对比，以了解DRA对煤热解的影响，并利用同位素示踪方法，讨论了低碳烃在CP-DRA中的作用。结果表明，CP-N₂得到的焦油中含有较多H_al、C_al和CH+CH₂的脂肪族化合物，而CP-DRA焦油含有较多C_ar、H_ar、H_α及CH₃，并且比CP-N₂焦油的平均分子量更低，焦油组分更轻。在CP-DRA中加入少量乙烷会提高CP-DRA焦油中的H_β和CH+CH₂的含量。电子顺磁共振分析表明，CP-DRA的焦油具有较高的自由基浓度，而相应的半焦具有较低的自由基浓度。同位素示踪实验表明，DRA提供·H、·CH₃等自由基稳定煤热解自由基，在CP-DRA过程中生成更多的烷基芳香族化合物。

Coal pyrolysis integrated with dry reforming of low-carbon alkane (CP-DRA) is an effective way to improve tar yield. Ni/La₂O₃-ZrO₂ with a La/Zr ratio of 4 was a good catalyst for DRA to inhibit carbon deposition and obtain high tar yield in CP-DRA. In this study, the fraction distribution and component of tars from CP-DRA and coal pyrolysis in N₂ atmosphere (CP-N₂) were characterized by using several methods to understand the effect of DRA on coal pyrolysis. The isotope trace method was also used to discuss the role of low-carbon alkane in CP-DRA. The results showed that the tar from CP-N₂ is mainly composed of aliphatic compounds with more C_al, H_al and CH+CH₂, and the tar from CP-DRA contains more C_ar, H_ar, and CH₃, and has lower weight-average molecular weight and more light tar content than CP-N₂. A small amount of C₂H₆ addition in CP-DRA will raise the ratio of H_β and CH+CH₂. Electron paramagnetic resonance (EPR) analysis shows that the tar from CP-DRA has a higher radical concentration while the corresponding char has a lower radical concentration. The isotope trace experiment showed that alkanes provide ·H, ·CH₃, etc. to stabilize the radicals from coal pyrolysis and result in more alkyl aromatic compounds during CP-DRA.