Control The Active Sites Of Pt By Modulatiing Pt Dispersion For The Selective Hydrogenation Of Furfuryl Alcohol

Biomass are featured with extensive distribution,abundant reserves,and sustainable regeneration,which has aroused widespread attention to the conversion of biomass and its platform molecule to produce fine chemicals and fiuels.Due to the diversity of chemical bonds(C=C,C-O-C,C-O-H,C=O)in these platform molecules,competitive or successive processes often exist in the reaction.Selective activation of one chemical bond and directional transformation to certain product remain a great challenge.The definition of active sites is the key factor to achieve target.In this paper,the active sites of pt were controlled by modulatiing pt dispersion,which was used for the selective hydrogenation of furfuryl alcohol.The main contents are as follows:1.The loading of Pt and the reduction method were changed,by which dispersed structure of Pt was regulated to form single atom,adjacent single atom,cluster and particle and selective activation of C-O-C and C-OH bonds in furfuryl alcohol was achieved.By regulating dispersion of Pt sites to form single Pt atoms,adjacent Pt atoms without Pt-Pt bond,and Pt clusters with Pt-Pt coordination or Pt particles,selective activation of C-O-C bond or C-OH bond in furfuryl alcohol molecule was realized.For Pt single atom,2-methylfuran was the main product with a selectivity of 93%(200?).For the sample with both adjacent single atoms and clusters,1,2-pentanediol and tetrahydrofurfuryl alcohol were the main products with selectivities of 43%and of 37%,respectively(160?).For Pt clusters,1,2-pentanediol was the main product with a selectivity of 86%(160?).For Pt particles with an average particle size of 15.5 nm,the selectivity of 1,2-pentanediol decreased to 64%.2.By in situ surface reaction method,it was found that for Pt single atom instead,it was more advantageous to selectively activate the C-O bond in the side chain of furfuryl alcohol to acquire 2-methylfuran with high selectivity.For adjacent Pt atom,it was advantageous to activate C=C to produce tetrahydrofurfurfuryl alcohol.For Pt cluster,it was preferable for the selective activation of the C=C bond far from side chains in furan rings,after which C-O-C bond in furan ring was fractured to give 1,2-pentanediol.