A series of xNiCeO_y@SiO₂ catalysts with different cerium contents were prepared by hydrothermal coprecipitation and Stöber method. The results of catalytic performance showed that 15NiCeO_y@SiO₂ has the best catalytic activity with the methane conversion of 81.1% and the specific activity of the catalyst (the amount of methane converted per mol Ni per minute) of 1.14. 10NiCeO_y@SiO₂ exhibits the highest stability, with the methane conversion remaining unchanged within 40 h. Compared with the undoped Ni@SiO₂ catalyst, the enhancement of the activity can be attributed to the reduction of the Ni particle size due to the doping of Ce, which enabled more exposure of active species. Meanwhile, the oxygen vacancies originating from extrinsic defects of ceria increase the reaction rate of activated carbon and CO₂, inhibit carbon deposition, and accelerate the structure stability.

中文翻译：

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Ce掺杂对xNiCeOy@SiO2催化剂甲烷干重整催化性能的影响

采用水热共沉淀法和Stöber法制备了一系列不同铈含量的x NiCeO _y @SiO ₂催化剂。催化性能结果表明，15NiCeO _y @SiO ₂催化活性最好，甲烷转化率为81.1%，催化剂比活性（每mol Ni每分钟转化的甲烷量）为1.14。10NiCeO _y @SiO ₂表现出最高的稳定性，甲烷转化率在 40 小时内保持不变。与未掺杂的 Ni@SiO _{2 相比}催化剂，活性的增强可归因于由于 Ce 掺杂导致的 Ni 粒径减小，这使得更多的活性物质暴露。同时，氧化铈外在缺陷产生的氧空位提高了活性炭与CO ₂的反应速率，抑制了积碳，加速了结构的稳定性。