ENVIRONMENTAL FRIENDLY PROCESSES OVER NANOSIZED GOLD CATALYSTS

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 709-716 pp

ABSTRACT

One-step vapor phase oxidation of aliphatic hydrocarbons over nanosized gold catalysts
by using oxygen is carried out. Selective oxidation of propylene to propylene oxide,
propane to acetone and isobutene to t-butanol with hydrogen-oxygen mixture in flow
conditions is investigated. The reaction occurs at the interface perimeter of the support
around the gold particles. The activity of these catalysts can be attributed to synergetic
effects between gold and titanium.
Adsorption of nitrogen oxide over the so synthesized nanosized gold catalysts is
investigated by in situ FTIR spectroscopy. Different mononitrosyls and dinitrosyls
adsorbed species as well as nitro- and nitro-nitrito complexes are observed. The
influence of time and temperature on the stability of these species is studied.

Keywords: gold catalysts, hydrocarbon oxidation, NO adsorption, titanosilicalites, propylene oxide