Promotion of Au(en)(2)Cl-3-derived Au/fumed SiO2 by treatment with KMnO4
Journal Article
·
· Journal of Physical Chemistry C
- ORNL
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/SiO{sub 2}-based catalysts were prepared by treating Au(en){sub 2}Cl{sub 3}-derived Au/fumed SiO{sub 2} in strongly oxidative KMnO{sub 4} solutions. The low-temperature activity in CO oxidation increased dramatically following the KMnO{sub 4} treatment and subsequent thermal activation (including treatment in O{sub 2}-He at 300-600 C). The influences of the pH values of KMnO{sub 4} solutions and temperatures of activation in O{sub 2}-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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 941035
- Journal Information:
- Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 22 Vol. 112; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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