Promotion of au(en)2Cl3-derived au/fumed SiO 2 by treatment with KMnO4

Hongfeng Yin, Zhen Ma, Steven H. Overbury, Sheng Dai

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A new method for the removal of organic ligands used in the synthesis of nanoparticle catalysts via solution-phase chemical oxidation and subsequent pretreatment at moderate temperatures was developed. This synthesis protocol is advantageous for the preparation of highly dispersed gold catalysts with minimum sintering. Highly active Au/SiO2-based catalysts were prepared by treating Au(en)2Cl3-derived Au/fumed SiO2 in strongly oxidative KMnO4 solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO4 treatment and subsequent thermal activation (including treatment in O2-He at 300-600°C). The influences of the pH values of KMnO4 solutions and temperatures of activation in O2-He prior to the reaction testing were investigated, and relevant characterization using XRD, TEM, TG/DTG, SEM, EDX, and ICP-OES was conducted. The catalyst stability in CO oxidation was studied as a function of reaction time on stream. The origin of the promotional effect was discussed.

Original languageEnglish
Pages (from-to)8349-8358
Number of pages10
JournalJournal of Physical Chemistry C
Volume112
Issue number22
DOIs
StatePublished - Jun 5 2008

Fingerprint

Dive into the research topics of 'Promotion of au(en)2Cl3-derived au/fumed SiO 2 by treatment with KMnO4'. Together they form a unique fingerprint.

Cite this