Chemisorption dynamics

Chemisorption dynamics in the presence of well defined surface defects... 

Because dissociative chemisorption dynamics will be a central topic of this review, we mention a few details of this process here. When the... 

Temperature programmed reduction TPR experiments were performed on Ifesh samples of Pt/LCH-Y and Pd/LCH-Y catalysts, in an Okhura TP-2002S system. The TPR runs were conducted using a heating rate of 10°C/min in a flow of 5% H2/Ar (45 cc/min) up to 600°C. CO chemisorption dynamic CO chemisorption measurements were carried out by sending 250-p,l pulses of 5 %CO/He on 0.2-g samples of fresh catalysts. The He used as a carrier and... 

Catalyst, % Pt (weight) TPR, ixmo/ of l-12/gat Chemisorption Dynamic, [imol 0fH2lgcM H/m... 

Catalyst % Pt (weight) TPR xmol de H2/gcat Chemisorption dynamic pmol de H2/gcat H/M... 

Rettner C T, Schweizer E K and Stein H 1990 Dynamics of chemisorption of N2 on W(100) Precursor-mediated and activated dissociation J. Chem. Phys. 93 1442... 

J Rettner C T and Mullins C B 1991 Dynamics of the chemisorption of O2 on Pt(111) Dissociation via direct population of a molecularly chemisorbed precursor at high incidence kinetic energy J. Chem. Phys. 94 1626... 

Kroes G J, Wiesenekker G, Baerends E J, Mowrey R C and Neuhauser D 1996 Dissociative chemisorption of H2 on Cu(IOO)—a four-dimensional study of the effect of parallel translational motion on the reaction dynamics J. Chem. Phys. 105 5979... 

M. Menon and R. E. AUen, New technique for molecular-dynamics computer simulations Hellmann- Feynman theorem and subspace Hamiltonian approach , Phys. Rev. B33 7099 (1986) Simulations of atomic processes at semiconductor surfaces General method and chemisorption on GaAs(llO) , ibid B38 6196 (1988). 

Metal dispersions were obtained by the dynamic pulse method using either H2, CO or O2 chemisorption at 298 K (.J) ... 

A word should be said regarding the use of O2 chemisorption to measure Ru-Ir metal dispersions. The stoichlonetry of the CO adsorption on Ir (CO/Irjgj) was taken from the literature to be 0.5 (9-10). The measured CO/O2 chemisorption ratio on Ir was determined using the dynamic pulse method and found to be 1.55. These results give... 

Figure 2.5 Dynamics of oxygen chemisorption at Cu(110) and Mg(0001) surfaces based on XPS and HREELS leading to oxidation of ammonia and imide chemisorbed species. The reactive oxygen is a transient state Cr(s). With ammonia-rich mixture Pathway 2 is dominant whereas for oxygen-rich mixtures Pathway 1 dominates at 295 K.

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