催化作用
双金属片
空间速度
尖晶石
程序升温还原
物理吸附
钴
拉曼光谱
X射线光电子能谱
无机化学
扫描电子显微镜
甲烷厌氧氧化
镍
甲烷
硫化
合成气
材料科学
化学
化学工程
选择性
冶金
光学
有机化学
生物化学
复合材料
工程类
物理
作者
Andoni Choya,Beatriz de Rivas,Jose Ignacio Gutiérrez-Ortiz,Rubén López‐Fonseca
标识
DOI:10.1016/j.jece.2022.108816
摘要
In this work bimetallic Ni catalysts supported over Co-Al2O3 and monometallic Co-Al2O3 and Ni-Al2O3 catalysts were examined for the complete oxidation of methane. With a 30 % total metallic loading, the samples were synthesized by a sequential precipitation route. All samples were characterized by nitrogen physisorption, X-ray fluorescence, X-ray diffraction, Raman spectroscopy, scanning electron microscopy, scanning-transmission electron microscopy, X-Ray photoelectron spectroscopy, and temperature-programmed reduction with hydrogen and methane. Their catalytic performance was investigated in the temperature range of 200–600 °C with a space velocity of 60.000 h−1. The bimetallic catalysts showed a better behavior in the oxidation reaction than the monometallic counterparts, mainly due to the good dispersion of Ni on the surface of the Co-Al2O3 samples. This has enabled the insertion of Ni2+ ions into the cobalt spinel lattice, which in turn provoked an increase in the amount of Co3+ species, and a subsequent enhanced mobility of oxygen species in the spinel. In this sense, the 5Ni/25Co catalyst showed the best performance, thus reducing the value of the T50 by 25 °C with respect to the monometallic catalysts.
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