We present an exptl. scheme for measuring turn-over frequencies (TOFs) and obtaining mechanistic details of catalytic processes on small clusters on surfaces with high sensitivity. The scheme uses a newly designed pulsed, piezo-elec. driven valve with extremely high pulse-to-pulse stability in combination with quant. mass spectrometry. The exptl. scheme is applied for studying the oxidn. of CO on mass-distributed palladium clusters deposited from a mol. beam onto well-characterized oxide surfaces. The obtained results are compared to the ones of palladium single crystals and supported palladium particles on oxide surfaces. The measured TOF is 47±8 CO2 mols. per deposited atom per s at 350 K and the obsd. mechanistic details can be explained by different active centers on the clusters and by the competitive adsorption of the two reactant mols. The interpretation is in agreement with earlier studies on the oxidn. of CO on palladium model catalysts. [on SciFinder(R)]     «

We present an exptl. scheme for measuring turn-over frequencies (TOFs) and obtaining mechanistic details of catalytic processes on small clusters on surfaces with high sensitivity. The scheme uses a newly designed pulsed, piezo-elec. driven valve with extremely high pulse-to-pulse stability in combination with quant. mass spectrometry. The exptl. scheme is applied for studying the oxidn. of CO on mass-distributed palladium clusters deposited from a mol. beam onto well-characterized oxide surface...     »

Oxidation (catalytic, for CO, mechanism turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Oxidation catalysts (for CO turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Clusters (metal turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Adsorption Catalysis Catalysts Mass spectrometry Molecular beams Nanoparticles Surface reaction (turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) turnover frequency catalytic reaction nanocatalyst pulsed mol beam mass spectrometry turnover frequency catalytic reaction nanocatalyst carbon monoxide oxidn palladium cluster catalyst turnover frequency     «

Oxidation (catalytic, for CO, mechanism turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Oxidation catalysts (for CO turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Clusters (metal turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry) Adsorption Catalysis Catalysts Mass spectrometry M...     »

CAN 139:354916 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Institute of Surface Chemistry and Catalysis, University of Ulm, Ulm, Germany. Journal 1387-3806 630-08-0 (Carbon monoxide) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (oxidn. of; turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry); 7440-05-3D (Palladium) Role: CAT (Catalyst use), CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process), USES (Uses) (turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry)     «

CAN 139:354916 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Institute of Surface Chemistry and Catalysis, University of Ulm, Ulm, Germany. Journal 1387-3806 630-08-0 (Carbon monoxide) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (oxidn. of; turn-over frequencies of catalytic reactions on nanocatalysts measured by pulsed mol. beams and quant. mass spectrometry);...     »