Tuning the oxidation of carbon monoxide using nanoassembled model catalysts

While the oxidn. of CO has long been considered to be structure insensitive, nano-assembled model catalysts consisting of size-selected metal clusters (Aun, Ptn, Pdn, and Rhn, n=1-20), supported on thin MgO(1 0 0) films, reveal distinct size-effects. When adding a single Pt atom to Pt14, platinum clusters increase their reactivity by a factor of three. Rh20 shows the highest reactivity of all the investigated clusters, oxidizing about 13 CO mols. per cluster at 350 K. While F-centers on MgO films transform Au8 from an inert to an active catalyst, the reactivity of Pd8 is not suppressed when deposited on defect-poor films. These different catalytic properties are rationalized within simple frontier orbital models, whereas for Au8 the reaction mechanism for the low temp. oxidn. of CO is elucidated within first-principle calcns. [on SciFinder(R)]     «

While the oxidn. of CO has long been considered to be structure insensitive, nano-assembled model catalysts consisting of size-selected metal clusters (Aun, Ptn, Pdn, and Rhn, n=1-20), supported on thin MgO(1 0 0) films, reveal distinct size-effects. When adding a single Pt atom to Pt14, platinum clusters increase their reactivity by a factor of three. Rh20 shows the highest reactivity of all the investigated clusters, oxidizing about 13 CO mols. per cluster at 350 K. While F-centers on MgO film...     »

CAN 134:168817 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Institut de Physique de la Matiere Condensee, Universite de Lausanne, Lausanne-Dorigny, Switz. Journal 0301-0104 1309-48-4 (Magnesia); 62863-33-6; 78393-62-1; 78393-82-5; 107436-21-5; 145536-84-1 (Gold cluster (Au8)); 145536-95-4; 150385-95-8; 150386-01-9; 150498-42-3; 151247-60-8; 158827-48-6; 258823-73-3 Role: CAT (Catalyst use), PRP (Properties), USES (Uses) (tuning oxidn. of carbon monoxide using nanoassembled model catalysts); 630-08-0 (Carbon monoxide) Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (tuning oxidn. of carbon monoxide using nanoassembled model catalysts)     «

CAN 134:168817 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Institut de Physique de la Matiere Condensee, Universite de Lausanne, Lausanne-Dorigny, Switz. Journal 0301-0104 1309-48-4 (Magnesia); 62863-33-6; 78393-62-1; 78393-82-5; 107436-21-5; 145536-84-1 (Gold cluster (Au8)); 145536-95-4; 150385-95-8; 150386-01-9; 150498-42-3; 151247-60-8; 158827-48-6; 258823-73-3 Role: CAT (Catalyst use), PRP (Properties), USES (Uses) (tuning oxidn. of carbon monoxide using...     »