Synthesis of Colloidal Pd/Au Dilute Alloy Nanocrystals and Their Potential for Selective Catalytic Oxidations

Journal of the American Chemical Society
Cody J WrasmanMatteo Cargnello

Abstract

Selective oxidations are crucial for the creation of valuable chemical building blocks but often require expensive and unstable stoichiometric oxidants such as hydroperoxides and peracids. To date, many catalysts that contain a single type of active site have not been able to attain the desired level of selectivity for partially oxidized products over total combustion. However, catalysts containing multiple types of active sites have proven to be successful for selective reactions. One category of such catalysts is bimetallic alloys, in which catalytic activity and selectivity can be tuned by modifying the surface composition. Traditional catalyst synthesis methods using impregnation struggle to create catalysts with sufficient control over surface chemistry to accurately tune the ensemble size of the desired active sites. Here we describe the synthesis of colloidal nanocrystals of dilute alloys of palladium and gold. We show that when supported on titania (TiO2), tuning the composition of the Pd/Au nanocrystal surface provides a synergistic effect in the selective oxidation of 2-propanol to acetone in the presence of H2 and O2. In particular, we show that certain Pd/Au surface ratios exhibit activity and selectivity far superi...Continue Reading

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Citations

Aug 16, 2019·Chemical Communications : Chem Comm·Jia-Qi BaiKeiichi Tomishige
Aug 28, 2019·Nanoscale·Michelle MuzzioShouheng Sun
Oct 10, 2019·Chemistry : a European Journal·Shuping ZhangJiatao Zhang
Oct 8, 2019·Physical Chemistry Chemical Physics : PCCP·Nan ZhangLongfei Guo
Feb 23, 2021·Chemical Communications : Chem Comm·Fengjuan Qin, Wenxing Chen
Apr 6, 2021·Journal of the American Chemical Society·Tomas RicciardulliDavid W Flaherty
May 8, 2021·Nature Materials·Jessi E S van der HoevenPetra E de Jongh
Dec 13, 2018·Accounts of Chemical Research·Georgios GiannakakisE Charles H Sykes
Nov 19, 2021·Advanced Science·Hyunjoong KimTaeghwan Hyeon

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