The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions ≥0.3 (crotonaldehyde) and ≥0.8 (CH); only ∼5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while CH combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.
Bibliographical noteWe thank the Engineering and Physical Sciences Research Council for financial support (EP/E046754/1; EP/G007594/1) and the award of a Leadership Fellowship (A.F.L.) and studentship (J.N.).
Naughton, J., Lee, A. F., Thompson, S., Vinod, C. P., & Wilson, K. (2010). Reactivity of crotonaldehyde and propene over Au/Pd(111) surfaces. Physical Chemistry Chemical Physics, 12(11), 2670-2678. https://doi.org/10.1039/b921669c