Encapsulating Ni nanoparticles inside the channels of ordered mesoporous materials with high dispersion should be an efficient strategy to improve both catalytic activity and stability for a Ni-based catalyst. In this work, a series of Ni/FDU-12 catalysts with Ni particle size and location control were designed and synthesized using an impregnation method, in which an ethylene glycol solution of trehalose was used as the delivery conveyor and sacrificial carbon template. This was because the eight hydroxyl groups of trehalose could be linked to Ni²⁺ ions to form a coordination complex of trehalose–Ni²⁺ due to the bridging character; meanwhile, trehalose promoted the wettability of the ethylene glycol solution of nickel nitrate with increasing its viscosity. The combined effects of complex and wettability result in narrow size distribution of NiO nanoparticles and a high dispersion of Ni species inside of the channels of the FDU-12 support. In addition, after calcination in inert flow, the carbonization of trehalose and residual ethylene glycol could provide carbon species inside the pores as the physical barrier to in situ immobilize Ni nanoparticles and hinder their migration during high-temperature reduction and catalytic performance tests. The designed Ni/FDU-12 catalysts exhibited high catalytic activity and stability for CO₂ methanation due to the high Ni dispersion and special structure of immobilized Ni particles, and the addition of CeO₂ could further improve their catalytic performance.

中文翻译：

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通过具有良好尺寸和位置控制的海藻糖原位固定Ni纳米颗粒至FDU-12，以实现CO ₂甲烷化

将Ni纳米颗粒以高分散度包裹在有序介孔材料的通道内应该是一种有效的策略，既可以提高Ni基催化剂的催化活性，又可以提高稳定性。在这项工作中，使用浸渍法设计和合成了一系列具有Ni粒径和位置控制的Ni / FDU-12催化剂，其中将海藻糖的乙二醇溶液用作输送带和牺牲碳模板。这是因为海藻糖的八个羟基可与Ni ²⁺离子连接形成海藻糖– Ni ²⁺的配位络合物由于桥接的特点；同时，海藻糖通过增加其粘度来促进硝酸镍的乙二醇溶液的润湿性。复杂性和润湿性的综合作用导致NiO纳米颗粒的尺寸分布狭窄，并且FDU-12载体通道内的Ni种类高度分散。此外，在惰性气流中煅烧后，海藻糖和残留的乙二醇的碳化可提供孔内的碳物质作为原位固定Ni纳米颗粒的物理屏障，并阻碍它们在高温还原和催化性能测试过程中的迁移。设计的Ni / FDU-12催化剂具有较高的催化活性和对CO _2的稳定性由于Ni的高分散性和固定化的Ni颗粒的特殊结构，甲烷化反应得以实现，而CeO _2的添加可进一步提高其催化性能。