Abstract A monolithic silicon carbide foam (SiC-foam) structured nickel and lanthanum oxide (Ni-La2O3) nanocomposite catalyst is developed via reducing the nickel oxide and lanthanum oxide (NiO-La2O3) precursor that can be grown onto SiC-foam surface by depositing the needed citric acid gel followed by calcination at 750 °C. By taking the advantages of homogeneous component-distribution and strong Ni-La2O3 interactions in the Ni-La2O3 nanocomposites, this catalyst delivers much enhanced coke-depositing/Ni-sintering resistance than the unmodified counterpart of Ni-La2O3/alumina (Al2O3) in the titled reaction. At 850 °C, a weight hourly space velocity (WSHV) is set as 24,000 mLCH4-CO2 gCat−1 h−1, methane/carbon dioxide (CH4/CO2) conversions of 71/85% are initially achieved on the Ni-La2O3/SiC-foam catalyst followed by progressively decreased to 60/72% within 50 h (h), but remain almost unchanged for the next 50 h. On the contrary, the CH4/CO2 conversions on the Ni-La2O3/Al2O3 catalyst rapidly drop from 49/71% to 24/40% within only 25 h due to its serious Ni-sintering and coke deposition.

中文翻译：

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用于甲烷干重整的单片 SiC 泡沫负载 Ni-La2O3 复合材料具有增强的抗碳性

摘要 碳化硅泡沫 (SiC-foam) 结构的镍和氧化镧 (Ni-La2O3) 纳米复合催化剂是通过还原氧化镍和氧化镧 (NiO-La2O3) 前驱体开发的，该前驱体可以通过沉积在 SiC 泡沫表面上生长。所需的柠檬酸凝胶，然后在 750 °C 下煅烧。通过利用 Ni-La2O3 纳米复合材料中组分分布均匀和 Ni-La2O3 强相互作用的优势，该催化剂比未改性的 Ni-La2O3/氧化铝（Al2O3）在题为反应。在 850 °C 时，重时空速 (WSHV) 设置为 24,000 mLCH4-CO2 gCat−1 h−1，甲烷/二氧​​化碳 (CH4/CO2) 转化率最初在 Ni-La2O3/SiC-泡沫催化剂上达到 71/85%，然后在 50 小时内逐渐降低到 60/72%，但对于接下来的 50 小时。相反，Ni-La2O3/Al2O3 催化剂上的 CH4/CO2 转化率在 25 小时内迅速从 49/71% 下降到 24/40%，这是由于其严重的 Ni 烧结和焦炭沉积。