The redox behavior of the catalyst and the catalytic decomposition of carbon monoxide (CO) were investigated in the synthesis process of multi‐wall carbon nanotubes (MWCNT) using Ni/MgO catalyst. The surface morphology of the heated Ni layer was observed by TEM to confirm the formation of NiO particles (50 nm or less) and NiO (222). The chemical reaction behavior of the catalyst in CO the atmosphere was displayed via TG‐DSC analysis, and the reduction of NiO was revealed due to the mass decrease of 2.71 wt% and the exothermic peak at around 400°C. The deposition of carbon was identified with an increase in mass and the exothermic peak near 600°C. Ni (111) and carbon (002) facets was taken place in a diffraction pattern of carbon deposited catalyst, indicating the reduction in NiO and the graphitic carbon deposition. The crystallinity of the graphitic carbon was analyzed as the ratios of 0.998 for I_D/I_G and 0.26 for sp³/sp² in Raman and photoelectron spectra. The encapsulated Ni in MWCNT was observed through TEM‐EDS, verifying the activation of the catalyst by CO.

中文翻译：

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在Ni / MgO上催化分解一氧化碳的多壁碳纳米管

在Ni / MgO催化剂合成多壁碳纳米管（MWCNT）的过程中，研究了催化剂的氧化还原行为和一氧化碳（CO）的催化分解。通过TEM观察加热的Ni层的表面形态，以确认形成了NiO粒子（50nm以下）和NiO（222）。通过TG-DSC分析显示了催化剂在CO气氛中的化学反应行为，并且由于质量下降2.71 wt％和在400°C附近出现了放热峰而显示出NiO的减少。随着质量的增加和接近600°C的放热峰，发现了碳的沉积。Ni（111）和碳（002）面以碳沉积催化剂的衍射图样发生，表明NiO减少和石墨碳沉积。我_d /我_ģ和0.26 SP ³ / SP ²在拉曼和光电子光谱。通过TEM-EDS观察到MWCNT中封装的Ni，证实了CO活化了催化剂。