Promotion of partial oxidation of methanol over thin Pt and Pd film catalysts by resonance oscillation of acoustic waves

The Catalytic Mechanics of Dynamic Surfaces: Stimulating Methods for Promoting Catalytic Resonance

“…Similar to surface acoustic waves, the RO waves exhibit surface distortion up to ∼100 nm, especially in the TERO orientation . These surface deformations have led to increases in the rate of reaction such as oxidation of methanol on Pt and Pd films …”

“…160 These surface deformations have led to increases in the rate of reaction such as oxidation of methanol on Pt and Pd films. 169 Implementing dynamic catalysis using acoustic waves has the benefit of extensive characterization and methods of implementation combined with the broad range of materials that can be stimulated including both metals and metal oxides. Selection of piezoelectric/ferroelectric materials can draw from materials across the full range of chemistry-relevant temperatures (25−500 °C) to select acoustic supports operable relative to their Curie temperature.…”

“…Similar to surface acoustic waves, the RO waves exhibit surface distortion up to ~100 nm, especially in the TERO orientation (158) . These surface deformations have led to increases in the rate of reaction such as oxidation of methanol on Pt and Pd films (167) . Implementing dynamic catalysis using acoustic waves has the benefit of extensive characterization and methods of implementation combined with the broad range of materials that can be stimulated including both metals and metal oxides.…”

Enhancing the catalytic activity and selectivity of the partial oxidation of methanol by electrochemical promotion

“…However, it is clear that the presence of K + ions on the Pt-CAD film led to a strong promotional effect in the partial oxidation mechanism, enhancing in a very strong way the production rates of H 2 and H 2 CO. One could explain such strong promotional effect attending to the mechanism of methanol partial oxidation reaction on Pt catalysts. Previous spectroscopic studies [34] have demonstrated that methanol molecule is adsorbed on Pt as a methoxy specie by dissociating H atom from the OH group according to reaction (8) According to this mechanism, the observed promotional effect upon negative polarization (under the presence of an electropositive promoter) can be attributed to an increase in metal-oxygen bonds strength (electron acceptor molecule), which would enhance the formaldehyde production rate through the reaction step (9). Thus, more active sites will be available for methoxy species chemisorption also increasing the H 2 production.…”

“…Then, there is a great interest in enhancing the partial oxidation mechanism vs. the deep oxidation one for the production of both kinds of products. A previous work of Yukawa et al [9] demonstrated the interest of promoting the selectivity of a Pt thin film by the thickness extension mode resonance oscillation (TERO) of bulk acoustic wave technique. This technique allows increasing the formaldehyde production selectivity from 10% to 20% under certain reaction conditions by artificially controlling the reactivity of surface oxygen.…”