Abstract
As a safe and environmentally friendly selective hydrogenation method,catalytic transfer hydrogenation(CTH)has aroused great interest in preparation of high-value-added products from biomass derived resources.Herein,a Cu-based catalyst(Cu/CuAl-MMO-400)was prepared by structural topological transformation of layered double hydroxides(LDHs)precursor,which displayed promising catalytic behavior toward CTH reaction of furfural(FAL)with 2-propanol(2-POL)as the hydrogen donor.Notably,the reaction rate is as high as 0.125 mol g~(-1)h~(-1),which is superior to previously reported non-noble metal catalysts.A combination investigation based on XPS,XANES and Bader charge confirms the co-existence of Cu° and Cu~+ sites on the surface of Cu nanoparticles.Both experimental studies [in situ DRIFTS and isotope labelling MS)and DFT calculations reveal that the Cu°-Cu~+ synergistic effect plays a vital role in determining catalytic behavior: the Cu~+ species acts as both dehydroge-nation and hydrogenation active site; while the Cu~0 site promotes the transfer of H atoms between adsorbed substrates.This work substantiates a Cu~0-Cu~+ synergetic catalysis by establishing structure-property correlation and revealing reaction pathway,which could be extended to other CTH reactions in the upgrading processes of biomass.
NSTL