The reactivity of gold and platinum metals in their cluster phase

Platinum surfaces are known to be among the most active ones for the oxidn. of carbon monoxide, whereas gold surfaces are completely inert for this reaction. The question remains: Do small clusters of these two metals maintain these distinct differences. To answer this question, we have employed temp.-programmed reaction (TPR) and Fourier transform IR (FTIR) spectroscopy to investigate the reactivity of small platinum and gold clusters consisting of up to 20 atoms. These clusters are generated in the gas phase by a laser evapn. source and, after mass selection, are deposited with low kinetic energy onto thin MgO films. The oxidn. of CO is studied for the octamer and the icosamer under UHV conditions. Surprisingly, all investigated cluster sizes are catalytically active. Pt20 shows the highest reactivity and oxidizes almost 6 CO mols., whereas Pt8, Au20, and Au8 oxidize just one CO mol. under identical exptl. conditions. [on SciFinder(R)]     «

Platinum surfaces are known to be among the most active ones for the oxidn. of carbon monoxide, whereas gold surfaces are completely inert for this reaction. The question remains: Do small clusters of these two metals maintain these distinct differences. To answer this question, we have employed temp.-programmed reaction (TPR) and Fourier transform IR (FTIR) spectroscopy to investigate the reactivity of small platinum and gold clusters consisting of up to 20 atoms. These clusters are generated i...     »

Oxidation catalysts (for CO reactivity of gold and platinum metals in their cluster phase in relation to) Clusters Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (metal reactivity of gold and platinum metals in their cluster phase) Oxidation (of CO reactivity of gold and platinum metals in their cluster phase) Reactivity (reactivity of gold and platinum metals in their cluster phase) gold cluster reactivity oxidn carbon monoxide platinum cluster reactivity oxidn carbon monoxide     «

Oxidation catalysts (for CO reactivity of gold and platinum metals in their cluster phase in relation to) Clusters Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (metal reactivity of gold and platinum metals in their cluster phase) Oxidation (of CO reactivity of gold and platinum metals in their cluster phase) Reactivity (reactivity of gold and platinum metals in their cluster phase) gold cluster reactivity oxid...     »

CAN 132:171736 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Universite de Lausanne, Institut de Physique de la Matiere Condensee, Lausanne, Switz. Journal 1434-6060 630-08-0 (Carbon monoxide) Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (oxidn. of; reactivity of gold and platinum metals in their cluster phase); 1309-48-4 (Magnesia) Role: PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (reactivity of gold and platinum metals in their cluster phase); 7440-06-4D (Platinum); 7440-57-5D (Gold); 145536-84-1; 145536-95-4; 150386-01-9; 258823-73-3 Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (reactivity of gold and platinum metals in their cluster phase)     «

CAN 132:171736 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Universite de Lausanne, Institut de Physique de la Matiere Condensee, Lausanne, Switz. Journal 1434-6060 630-08-0 (Carbon monoxide) Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (oxidn. of; reactivity of gold and platinum metals in their cluster phase); 1309-48-4 (Magnesia) Role: PEP (Physical, engineering or chemical process)...     »