催化作用
烧结
水滑石
合金
分解
氢
煅烧
碳纤维
镍
材料科学
化学工程
甲烷化
冶金
无机化学
化学
复合材料
复合数
有机化学
工程类
作者
Peng Wang,Hong Zhu,Min Huang,Chunsheng Wan,Dalin Li,Lilong Jiang
摘要
Ni-Fe/Al2O3 alloy catalysts obtained from Ni3-xFexAl (x = 0-1.2) hydrotalcite-like compounds are tested in CH4 decomposition at 600°C to produce H2 and carbon. By calcination at 500°C, nickel-iron-aluminum hydrotalcite is decomposed into Ni(Fe,Al)O solid solution; upon reduction at 800°C, Ni-Fe alloy with uniform composition and the average size of 9.4 to 10.3 nm is formed. The Ni-Fe/Al2O3 alloy catalysts exhibit higher catalytic life and carbon yield than the Ni3Al counterpart, with the optimal alloy composition being Ni: Fe = 4:1. Carbon nanotubes are produced on all catalysts, and the average carbon diameter is decreased to a certain degree by Ni-Fe alloying. XRD indicates that Ni-Fe alloy is less sintered than Ni metal under the reaction atmosphere, which may account for the decrease in the carbon diameter. This study provides a way for the preparation of a uniform Ni-Fe alloy catalyst and its sintering resistance is helpful for controlling the carbon morphology.
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