二氧化碳重整
甲烷
催化作用
双金属片
原子层沉积
合成气
化学工程
焦炭
离解(化学)
纳米颗粒
材料科学
碳纤维
金属
无机化学
图层(电子)
纳米技术
化学
冶金
有机化学
复合材料
工程类
复合数
作者
Rui Zhao,Xudong Du,Kun Cao,Miao Gong,Yicheng Li,Jianping Ai,Rongli Ye,Rong Chen,Bin Shan
标识
DOI:10.1016/j.ijhydene.2023.03.470
摘要
Dry reforming of methane (DRM) is a sustainable chemical process that can simultaneously transform methane and carbon dioxide, which are generally considered greenhouse gases, into syngas with H2/CO ratio close to 1. The deposition of carbon on the active sites during long-period DRM tests will lead to severe deactivation of Ni-based catalysts. Thus, in this work, we proposed a series of uniformly dispersed Fe-decorated Ni/Al2O3 catalysts via atomic layer deposition (ALD) to solve this key issue. Modification with trace amounts of Fe (0.3–0.6%) had multiple effects on facilitating the CH4 dissociation on Ni0, improving the low-temperature catalytic activity, moderating the carbon species and accelerating coke oxidation. The sample denoted as 0.3%Fe/Ni/Al2O3 exhibited almost no activity loss in the 72 h test at 650 °C. The Fe-decorated Ni/Al2O3 structure achieved a balance between the enhancement of CH4 cracking and the elimination of coke. Furthermore, this advanced ALD approach of preparing uniform secondary metal nanoparticle-decorated catalysts provided guidance to other bimetallic systems, such as Pt/Ni, Mn/Ni, and Cu/Ni.
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