KINETICS OF METHANOL DECOMPOSITION OF Rh(100) AND Rh(111) FIELD EMITTERS

G. Chuah , N. Kruse , J. Block , G. Abend

The decomposition of methanol on Rh has been investigated by means of pulsed field desorption mass spectrometry (PFDMS). lntermediates of the decomposition. CHxO (x = 1 - 3), are identified. By varying the temperature and reaction time it is possible to elucidate the elementary steps in methanol decomposition. A model based on a stepwise H-abstraction of the methoxy is postulated. The reaction becomes desorption-rate limited if the final products, CO(ad) and H(ad), are not removed from the surface and block sites required for reaction. However, by using a desorption field high enough to quantitatively remove the final products, the rate-determining step is found to be the removal of the H from the methoxy. Computer simulations support this observation.

Domaines: Articles anciens

G. Chuah, N. Kruse, J. Block, G. Abend. KINETICS OF METHANOL DECOMPOSITION OF Rh(100) AND Rh(111) FIELD EMITTERS. Journal de Physique Colloques, 1988, 49 (C6), pp.C6-215-C6-220. ⟨10.1051/jphyscol:1988636⟩. ⟨jpa-00228133⟩