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Synergistic effect of nitrogen-doped carbon-nanotube-supported Cu–Fe catalyst for the synthesis of higher alcohols from syngas

Synergistic effect of nitrogen-doped carbon-nanotube-supported Cu–Fe catalyst for the synthesis of higher alcohols from syngas
Heteroatom doping is an attractive approach for improving the properties of carbon materials for various applications. In this study, a series of nitrogen-doped (N-doped) carbon-nanotube-supported Cu–Fe (xCu n –Fe m /yN-CNT) catalysts were prepared for CO hydrogenation to higher alcohols. The structural and textural properties of N-doped catalysts were characterized by X-ray diffraction, transmission electron microscopy, hydrogen temperature-programmed reduction, and CO2 temperature-programmed desorption. The results revealed that doping N into CNT supports improved the Cu–Fe dispersion, strengthened the interaction of Cu and Fe species with N-CNT, and introduced many surface-basicity sites. Thus, an improved CO conversion and excellent selectivity to higher alcohols [S(C2+–OH)] were obtained. Furthermore, the selectivity to alcohols [S(ROH)] and S(C2+–OH)/S(MeOH) over the optimized 15Cu1–Fe1/1.3N-CNT catalyst reached 27.2% and 2.2, while the corresponding values were 20.2% and 0.4, respectively, over the catalyst without N doping under identical reaction conditions. The present results on N-CNT supported Cu–Fe catalyst will provide further understanding on the catalyst design for the transformation of syngas to higher alcohols.

Publisher URL: www.sciencedirect.com/science

DOI: S0016236117310499

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