Catalytic reactions studied by angle-resolved product desorption

Matsushima, Toshiyasu; Shobatake, Kosuke

doi:10.1039/9781849732772-00139

Cited by 5 publications

(2 citation statements)

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“…The energy and angle at which the desorbing products of surface reactions, measurements made under UHV conditions, can give insight into the dynamics of the reaction. − The direction and energy of the reaction products relative to the surface normal provides key information on the orientation of the transition state and where the reaction takes place on stepped surfaces. Measuring how the energy liberated during the reaction is partitioned into the products yields valuable insight into the reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…The catalytic activity of metal surfaces is technologically important, and many techniques for studying the heterogeneous catalysis of gaseous species have been developed in an effort to understand the fundamental reaction mechanisms. − These techniques span a tremendous pressure range from ultrahigh vacuum (UHV) (∼10 –10 Torr) to many Torr. Often, the information obtained in experiments done in different pressures regimes is complementary, but a particular approach can only be implemented in a narrow window at one end of the pressure range.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Surface and Subsurface Oxygen Reactivity and Dynamics with CO Adsorbed on Rh(111)

2014

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The translational and angular intensity dependence of CO 2 produced from the reaction of CO with an initial oxygen coverage of 0.5 ML ≤ Θ O ≤ 1.6 ML on Rh(111) at a surface temperature of 450 K was measured. This range of coverages goes from only surface absorbed O to both adsorbed and selvedge absorbed O. The measured CO 2 translational energy is independent of Θ O and is larger than steady-state experiments [Colonell et al. J. Chem. Phys. 1995, 103, 6677], which were done at lower O coverages, but follows the trend that higher Θ O leads to faster CO 2 . The angular dependence of the intensity is well-described by a sharply peaked function of the form I = a cos n (θ) + (1 − a) cos(θ), with a = 0.6 and n = 8.6. Again, this was consistent with the previous steady-state results. These observations point to a similar reaction geometry regardless of Θ O ; the measured dynamical parameters are independent of whether or not some of the O is subsurface and suggest that absorbed oxygen in the selvedge acts only as a reservoir for replenishing reagent as it is consumed.

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Section: Introductionmentioning

confidence: 99%