What is the effect of Sn and Mo oxides on gold catalysts for selective oxidation of benzyl alcohol?

TY - JOUR

T1 - What is the effect of Sn and Mo oxides on gold catalysts for selective oxidation of benzyl alcohol?

AU - Xu, Jing

AU - Wang, Yue

AU - Cao, Yunxiang

AU - He, Zhengke

AU - Zhao, Lianming

AU - Etim, Ubong Jerome

AU - Bai, Peng

AU - Yan, Zifeng

AU - Wu, Pingping

N1 - Publisher Copyright: © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

PY - 2019

Y1 - 2019

N2 - A foam-like mesoporous silica (MCF)-supported gold (Au) nanoparticle (NP) catalyst was prepared by a facile one-pot synthesis strategy. SnOx and MoOx were introduced as promoters by a wet impregnation method to synthesize promoted catalysts Au-SnOx/MCF and Au-MoOx/MCF, respectively. The evaluation of the prepared catalysts in benzyl alcohol oxidation shows that introduction of a low amount of SnOx (0.2 wt%) leads to a higher catalytic activity, while a relatively high amount of SnOx (1.0 wt%) exhibits a lower catalytic activity than the unpromoted Au NP catalyst. Both characterization results and density functional theory (DFT) calculations suggest that the most important effect of SnOx species on gold catalysts is the strong interaction between them which leads to electron transfer and lattice distortion of Au NPs, providing more low-coordinated Au active sites. This structural modification enhanced the chemisorption of reactants and lowered the energy barrier for the dissociation of O2 molecules on the surface of gold catalysts, improving the catalytic performance for benzyl alcohol oxidation. However, a weaker interaction was detected between MoOx and Au NPs on catalysts Au-MoOx/MCF and no lattice modification was observed; thus no improvement in the catalytic activity for benzyl alcohol oxidation occurred on catalysts Au-MoOx/MCF.

AB - A foam-like mesoporous silica (MCF)-supported gold (Au) nanoparticle (NP) catalyst was prepared by a facile one-pot synthesis strategy. SnOx and MoOx were introduced as promoters by a wet impregnation method to synthesize promoted catalysts Au-SnOx/MCF and Au-MoOx/MCF, respectively. The evaluation of the prepared catalysts in benzyl alcohol oxidation shows that introduction of a low amount of SnOx (0.2 wt%) leads to a higher catalytic activity, while a relatively high amount of SnOx (1.0 wt%) exhibits a lower catalytic activity than the unpromoted Au NP catalyst. Both characterization results and density functional theory (DFT) calculations suggest that the most important effect of SnOx species on gold catalysts is the strong interaction between them which leads to electron transfer and lattice distortion of Au NPs, providing more low-coordinated Au active sites. This structural modification enhanced the chemisorption of reactants and lowered the energy barrier for the dissociation of O2 molecules on the surface of gold catalysts, improving the catalytic performance for benzyl alcohol oxidation. However, a weaker interaction was detected between MoOx and Au NPs on catalysts Au-MoOx/MCF and no lattice modification was observed; thus no improvement in the catalytic activity for benzyl alcohol oxidation occurred on catalysts Au-MoOx/MCF.

UR - http://www.scopus.com/inward/record.url?scp=85061190786&partnerID=8YFLogxK

U2 - 10.1039/C8NJ05642K

DO - 10.1039/C8NJ05642K

M3 - 文章

AN - SCOPUS:85061190786

SN - 1144-0546

VL - 43

SP - 2591

EP - 2599

JO - New Journal of Chemistry

JF - New Journal of Chemistry

IS - 6

ER -