Effect of supports on performance of Cu–Fe based catalysts for higher alcohols synthesis from syngas
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In this study, a series of Cu–Fe based catalysts with Cr, Ni promoters and different supporters [activated carbon (AC), attapulgite (ATP), carbon nanotubes (CNTs)] were prepared by the co-precipitation method. The structure and surface properties of the catalysts were characterized by N2 adsorption–desorption, X-ray diffraction (XRD), scanning electronic microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), transmission electron microscopy (TEM), CO temperature-programmed desorption (CO-TPD), H2 temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) techniques. The catalysts were examined in a fixed bed for their ability to selectively convert syngas into higher alcohols. Results showed that CuFeCrNi/CNTs catalyst had the higher Brunauer–Emmett–Teller (BET) surface area (132.22 m2 g−1) and Cu–Fe alloy nanoparticle highly dispersed on the CNTs surface. Thus, the catalyst possessed the higher CO conversion (44.28%), excellent selectivity to higher alcohols (46.0%), and C2+OH/CH3OH reached 1.36 in the liquid product,which turned out to be one of the best catalysts for higher alcohol synthesis.
KeywordsCu–Fe based catalysts Support Syngas Higher alcohols
The authors gratefully acknowledge the financial support from Science and Technology Project of Shaanxi Province (Contract No: 2016GY-171).
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