A metal atom model for the oxidation of carbon monoxide to carbon dioxide. The gold atom-carbon monoxide-dioxygen reaction and the gold atom-carbon dioxide reaction

Surface chemistry of catalysis by gold

“…For example, highly dispersed Au/TiO2 catalysts have shown activity down to 209 K (490, for example) and gold clusters have shown reactivity at liquid nitrogen temperatures (169,185). Although it is known that bulk gold is a catalyst for CO oxidation at high temperatures (300°C) (491)(492)(493), this reaction may occur via a completely different mechanism than the low temperature reaction (or even catalyzed by impurities).…”

Ultrathin Oxide Films on Au(111) Substrates

“…However, inverse model catalysts with ordered oxide structures deposited on metal substrates allow for the exploration of some fundamental steps in heterogeneous catalysis using a variety of surface science tools. An oxide/metal system that has attracted much attention is that of oxide-supported Au nanoparticles which acts as an excellent catalysts in the conversion of CO into CO 2 at remarkably low temperatures (200 K) [7,8]. Another important area is the catalytic activity of the Au/oxide systems towards the water-gas shift reaction (H 2 O + CO → H 2 + CO 2 ) [9,10].…”

Carbon Dioxide Activation by Surface Excess Electrons: An EPR Study of the CO2− Radical Ion Adsorbed on the Surface of MgO

“…[1,2] However the exploitation of this molecule is seriously hampered by its thermodynamic stability and its rather high kinetic activation, thus a relevant external supply of thermal, electrical, or radiation energy is needed for its activation. In this context, there have been a number of investigations dealing with the activation of CO 2 either by classical coordination chemistry with transition metals [3,4] or transition metal complexes, [5] or by electron transfer from solid surfaces in typical heterogeneous catalytic processes. [6][7][8][9] The reduction of CO 2 to the radical anion CO 2 À represents thus an important mode of activation.…”