Preparation of Pt/γ-Al2O3-C Heterogeneous Catalyst for Highly Selective Hydrogenation of Cinnamaldehyde Towards Cinnamyl Alcohol

摘要

A Pt/y-Al2O3-C heterogeneous catalyst with improved catalytic performance was successfully prepared.Bayberry tannin(BT),an abundant natural plant polyphenol,was utilized to modifiy the surface of the γ-Al2O3 matrix and then stabilize Pt nanoparticles(NPs).The catalyst was systematically and specifically characterized by a collection of analytic tools including XRD,XPS,FTIR,TEM,and TG.It was found that the Pt NPs were envenly dispered on the γ-Al2O3-C matrix.Meanwhile,when the catalyst was applied for selective hydrogenation of cinnamaldehyde(CMA) in the presence of KOH promoter in solvent,excellent catalytic performance was obtained.The selectivity to cinnamyl alcohol(CMO) reached 97.88％ with 88.45％ CMA conversion within 30 min in the presence of 0.037 mol/L KOH,without significant loss of catalytic activity even under cyclic measurements for 5 times.The excellent catalytic performances should be ascribed predominantly to the uniform and stable dispersion ofPt NPs on the γ-Al2O3-C matrix and the excellent heat stability of BT.