W. Zhang et al. / Journal of Molecular Catalysis A: Chemical 335 (2011) 71–81
81
of K is systematically investigated through several characterization
methods, which can be summarized as follows: (1) K doping has a
great influence on Pd2+ precursor phase and the reduced Pd atom.
TPR data indicates that there exists a strong interaction between K
and Pd2+, which inhibits the reduction of Pd2+ species. The results
of CO-FTIR and H2 chemisorption also suggest that the strong inter-
action still exists between K and the reduced Pd atoms. (2) K doping
has caused the red-shift of CO adsorption, which suggests that more
basic nature of K-doped Al2O3 results in an electron transfer to Pd,
leading to a higher Pd electron density, and ultimately promoting
the decarbonylation of furfural. (3) The furfural-TPSR and furfural-
FTIR results indicate that the doping of K can change the adsorption
mode of furfural on Pd catalysts. Finally, it is important to mention
that the decrease of ꢀ2(C,O) configuration might be the main reason
for suppressing hydrogenation of furfural on K-doped Pd catalysts.
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