CuFe and CuCo supported on pillared clay as catalysts for CO2 hydrogenation into value-added products in one-step

Abstract

Value-added products synthesis by the one-step CO2 hydrogenation reaction has attracted much attention of researchers. In this paper, three catalysts: Cu/V-AlPILC,CuFe/V-AlPILC, and CuCo/V-Al PILC, prepared by impregnation method on Al-pillared clay support were studied. The effect of Fe and Co additives on the physicochemical properties of Cu-based catalysts was characterized by X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscope (SEM), N2 adsorption/desorption isotherms, temperature programmed reduction (TPR), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), N2O decomposition, CO2 and NH3 temperature-programmed desorption (CO2-TPD and NH3-TPD), and Fourier Transform Infrared Spectroscopy after gaseous pyridine adsorption (Py-FTIR) techniques. These catalysts were evaluated for CO2 hydrogenation into value-added products at temperatures ranging from 250 to 300 °C for 3 h and 40 bar pressure. Stability test was performed at 250 °C for 24 h and 40 bar pressure. The catalytic behavior revealed that a linear relationship does exist between the CO2 conversion with the metallic area. The DME and methanol synthesis showed a correlation with the basic and acid sites. The CuFe/V-Al PILC catalyst showed the highest selectivity for methanol and DME at 250 °C.