This paper introduces innovative porous Ni@SiO nanocapsule catalysts for high-temperature dry reforming of methane, synthesized through a selective etching method in a mild alkaline solution with varying CTAB concentrations. While core-shell catalysts have been proven effective in addressing issues like active metal sintering and coking, their dense inert oxide shells can impede intrinsic kinetics and hinder gas diffusion. The optimized catalyst, M-NSNC-2, showcases exceptional performance, featuring small Ni nanoparticles (5.3 nm) within a porous SiO nanocapsule (>900 mg). M-NSNC-2 demonstrates outstanding methane conversion (>82%), stability (50 hours), and resistance to sintering, agglomeration, and higher-ordered carbon deposition. In comparison to dense Ni@SiO nanocapsules (NSNC), M-NSNC-2 exhibits superior performance with nearly 13-fold enhanced mass transfer diffusivity. Additionally, the porous Ni@SiO nanocapsule catalyst exhibits an apparent CH activation energy of 67.9 kJ/mol at a kinetic regime of 1800,000 mL gh, emphasizing its efficacy in catalyzing dry reforming of methane.

中文翻译：

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释放多孔 Ni@SiO2 纳米胶囊催化剂的卓越扩散能力，增强甲烷干重整

本文介绍了用于甲烷高温干重整的创新多孔 Ni@SiO 纳米胶囊催化剂，该催化剂通过选择性蚀刻方法在不同 CTAB 浓度的弱碱性溶液中合成。虽然核壳催化剂已被证明可以有效解决活性金属烧结和焦化等问题，但其致密的惰性氧化物壳会阻碍内在动力学并阻碍气体扩散。优化后的催化剂 M-NSNC-2 展现出卓越的性能，在多孔 SiO 纳米胶囊 (>900 mg) 内具有小 Ni 纳米颗粒 (5.3 nm)。 M-NSNC-2 表现出出色的甲烷转化率（>82%）、稳定性（50 小时）以及抗烧结、抗团聚和高阶碳沉积能力。与致密 Ni@SiO 纳米胶囊 (NSNC) 相比，M-NSNC-2 表现出优越的性能，传质扩散率提高了近 13 倍。此外，多孔Ni@SiO纳米胶囊催化剂在1800,000 mL gh的动力学状态下表现出67.9 kJ/mol的表观CH活化能，强调了其催化甲烷干重整的功效。