Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 104, Issue 1-2, Pages 84-90Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2011.02.025
Keywords
Colloid; Silver; Oxidation; Hydrocarbon; Plasma; Catalyst
Funding
- Centacata EU-Transitional
- UEFISCSU [IDEI-223]
- EPSRC
- [21-048/ANCS]
- EPSRC [EP/G012156/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G012156/1] Funding Source: researchfish
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Silver colloids have been prepared by reducing AgNO(3) in aqueous solution and embeded in alumina following a sol-gel procedure in the presence of Pluronic 84 ((EO)(19)(PO)(39)(EO)(19)), as surfactant. Plasma-catalytic experiments aimed at the mineralization of toluene showed that the selectivity to CO(2) was significantly increased in the presence of Ag catalysts compared with results obtained using the plasma alone. In-situ studies of the ozone interaction with catalysts provide an insight into the nature of the active sites of supported silver colloids for mineralization reactions. It is noticeable that when ozone is chemisorbed on embedded Ag colloidal catalysts no change in the silver oxidation state or size is found. The population of the chemisorbed species is higher at lower temperatures, where the non-selective decomposition of ozone is smaller. The catalysts exhibit high stability, preserving the structural and textural properties after the catalytic tests, that is indeed very important in the presence of ozone. (C) 2011 Elsevier B.V. All rights reserved.
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