Journal of Molecular Catalysis A-Chemical, Vol.397, 134-141, 2015
Gas phase hydrogenation of dimethyl-1,4-cyclohexane dicarboxylate over highly dispersed and stable supported copper-based catalysts
Highly dispersed and stable supported copper-based catalysts for gas-phase hydrogenation of dimethyl 1,4-cyclohexane dicarboxylate (DMCD) to 1,4-cyclohexane dimethanol (CHDM) were synthesized from a single-source Cu-Zn-Al layered double hydroxide (LDH) precursor. The catalysts were characterized by X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H-2-TPR), X-ray photoelectron spectroscopy (XPS), N-2 sorption, H-2-N2O titration and transmission electron microscopy (TEM) techniques. The results revealed that calcination temperature for LDH precursors significantly affected the composition, structure, chemical states, and catalytic performance of copper-based catalysts. In the gas-phase selective hydrogenation of DMCD, a high CHDM yield of 95.6% was achieved over copper-based catalyst obtained at calcination temperature of 600 degrees C. Compared with the conventional Cu/ZnO/Al2O3 and Cr2O3 promoted copper-based catalysts, LDH-derived Cu-based catalysts exhibited higher catalytic performance, which was mainly attributed to the presence of highly dispersed and stable active metallic copper species, as well as a reasonable amount of Cu+ species facilitating the activation of ester groups of reactants. (C) 2014 Elsevier B.V. All rights reserved.
Keywords:Copper-based catalyst;High dispersion;Stability;Dimethyl-1,4-cyclohexanedicarboxylate;Hydrogenation