Sintering and carbon deposition of Ni-based catalysts limit dry reforming of methane (DRM) reaction. Herein, honeycomb-structural Al2O3 was prepared and supported with Ni (Ni/Al2O3) to enhance coke tolerance during the DRM reaction. Compared to Al2O3-CT obtained from Al(NO3)3·9H2O treated with citric acid and triethanolamine, the Al2O3-AN obtained from Al(NO3)3·9H2O treated with amide still has a stable honeycomb structure at high temperatures and can inhibit the sintering of Ni particles and sufficiently expose the active sites. TEM results showed that the average particle sizes of Ni/Al2O3-CT and Ni/Al2O3-AN were 9.1 nm and 7.6 nm, respectively. After a 100-hour reaction, the conversion of CH4 and CO2 on Ni/Al2O3-CT decreased by approximately 13%, while on Ni/Al2O3-AN, the conversion of CH4 and CO2 decreased by approximately 6%. The SEM results showed that the average particle sizes of Ni/Al2O3-CT and Ni/Al2O3-AN were 24.2 nm and 14.3 nm, respectively. The thermogravimetric (TG) curves indicated that carbon deposition on Ni/Al2O3-AN mainly occurred in the early stage of the DRM reaction with excellent coke tolerance. In situ DRIFT spectra showed that the stable honeycomb structure on Ni/Al2O3-AN enhanced the activation efficiency of CO2 on the catalyst.

中文翻译：

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稳定蜂窝结构 Al2O3 上的 Ni，提高耐焦性，用于甲烷干重整


镍基催化剂的烧结和碳沉积限制了甲烷 （DRM） 反应的干重整。在此，制备了蜂窝结构的 Al2O3 并用 Ni （Ni/Al2O3） 负载，以增强 DRM 反应过程中的焦炭耐受性。与柠檬酸和三乙醇胺处理Al（NO3）3·9H2O得到的Al2O3-CT相比，酰胺处理Al（NO3）3·9H2O得到的Al2O3-AN在高温下仍具有稳定的蜂窝结构，可以抑制Ni颗粒的烧结，充分暴露活性位点。TEM 结果表明，Ni/Al2O3-CT 和 Ni/Al2O3-AN 的平均粒径分别为 9.1 nm 和 7.6 nm。反应 100 小时后，Ni/Al2O3-CT 上 CH4 和 CO2 的转化率降低了约 13%，而 Ni/Al2O3-AN 上 CH4 和 CO2 的转化率降低了约 6%。SEM 结果表明，Ni/Al2O3-CT 和 Ni/Al2O3-AN 的平均粒径分别为 24.2 nm 和 14.3 nm。热重 （TG） 曲线表明，Ni/Al2O3-AN 上的碳沉积主要发生在 DRM 反应的早期阶段，具有优异的耐焦性。原位漂移光谱表明，Ni/Al2O3-AN 上稳定的蜂窝结构提高了 CO2 对催化剂的活化效率。