Chemistry on single atoms. Key factors for the acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms

Acetylene trimerization on Ag, Rh, and Pd atoms supported on the MgO (0 0 1) surface was studied exptl. and theor. The electronic configuration of Ag renders these atoms inert both as free or supported atoms. The reactivity of Pd and Rh is strongly influenced by their adsorption and by their diffusion dynamics on the MgO surface. Pd atoms are turned into active catalysts only when adsorbed on O vacancies (F centers). The low activation barriers computed for cyclotrimerization on free Rh atoms are substantially increased for Rh adsorbed on a MgO surface. Here, the reaction is only catalyzed when Rh is trapped on F centers. On steps, where Rh atoms are strongly bound, steric effects prevent the reaction to occur. [on SciFinder(R)]     «

Acetylene trimerization on Ag, Rh, and Pd atoms supported on the MgO (0 0 1) surface was studied exptl. and theor. The electronic configuration of Ag renders these atoms inert both as free or supported atoms. The reactivity of Pd and Rh is strongly influenced by their adsorption and by their diffusion dynamics on the MgO surface. Pd atoms are turned into active catalysts only when adsorbed on O vacancies (F centers). The low activation barriers computed for cyclotrimerization on free Rh atoms ar...     »

CAN 142:63188 66-3 Surface Chemistry and Colloids Institute of Surface Chemistry and Catalysis, University of Ulm, Ulm, Germany. Journal 0009-2614 74-86-2 (Acetylene) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms); 1309-48-4 (Magnesia) Role: NUU (Other use, unclassified), USES (Uses) (acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms); 7440-05-3 (Palladium); 7440-16-6 (Rhodium); 7440-22-4 (Silver) Role: PRP (Properties) (acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms)     «

CAN 142:63188 66-3 Surface Chemistry and Colloids Institute of Surface Chemistry and Catalysis, University of Ulm, Ulm, Germany. Journal 0009-2614 74-86-2 (Acetylene) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms); 1309-48-4 (Magnesia) Role: NUU (Other use, unclassified), USES (Uses) (acetylene trimerization on MgO-supported Rh, Pd, and Ag atoms); 7440-05-3 (Palladiu...     »