焦炭
化学链燃烧
分解
介孔材料
催化作用
化学工程
材料科学
化学
流化床
冶金
有机化学
工程类
作者
Sang Beom Han,Min Sung Kim,Yonggang Deng,Kernyong Kang,Jae‐Soon Choi,Eunjoo Jang,Jong Wook Bae
标识
DOI:10.1016/j.cej.2024.151034
摘要
Highly ordered mesoporous NiLaCeOx mixed metal oxide was investigated as effective catalyst for the chemical looping-based dry reforming of methane (CH4) with carbon dioxide (CO2) (CL-DRM). This catalyst exhibited excellent catalytic activity and stability in the decomposition of CH4 to form H2 with surface carbons subsequently activated by CO2 via reverse Boudouard reaction to form CO. Among the NiMCeOx catalysts with various promoter (M = Co, Zr, or La), the optimal NiLaCeOx catalyst preserved its original highly ordered mesoporous structures, leading to the higher dispersion of smaller Ni nanoparticles. This was attributed to the stronger Ni-Ce interactions facilitated by the La2O3 metal oxide promoter. The NiLaCeOx demonstrated a higher rate of H2 formation and successive CO production in the CL-DRM reaction, resulting in a H2/CO ratio above 1.0. Additionally, this catalyst exhibited superior structural stability over 5 cyclic CL-DRM reactions for CH4 decomposition (>85 %) and CO2 activation (>45 %), with minimal deposition of cokes.
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