Heterogeneous Combustion of Benzene on Rh(111): Kinetics and Dynamics of CO and CO2 Production

Millisecond catalytic reforming of monoaromatics over noble metals

“…Benzene seems to react primarily at the catalyst surface with little homogeneous gas‐phase reaction. Benzene adsorbs by π‐bonding parallel to the Rh surface, typically over a three‐fold hollow site with very limited molecular desorption 17–21. Decomposition begins by C–C bond cleavage and surface carbon species can react with adsorbed oxygen 18, 20, 21.…”

“…Benzene adsorbs by π‐bonding parallel to the Rh surface, typically over a three‐fold hollow site with very limited molecular desorption 17–21. Decomposition begins by C–C bond cleavage and surface carbon species can react with adsorbed oxygen 18, 20, 21. The presence of hydrocarbon surface species facilitates carbon movement on the metal surface for further reaction, limiting coke formation 20.…”

Principles of hydrocarbon detection in ultra high vacuum: Optimizing sensitivity and selectivity towards harmful species

“…Accordingly, the steady state oxygen coverage of the working electrode rises and V WR decreases: the device becomes relatively less sensitive to changes in hydrocarbon pressure because such changes produce relatively small changes in steady state oxygen coverage. Eventually, at sufficiently high temperatures (∼ 850 K) when every impinging hydrocarbon molecule is immediately combusted [15][16][17][18][19] steady state oxygen coverage approaches that of the hydrocarbon free system and V WR tends to zero. As is apparent from Fig.…”

“…Thus each toluene molecule can consume six more O atoms than each 1-butene molecule so that higher temperatures (and therefore higher semipermeation rates) are required before the oxygen supply rate is high enough to combust every impinging molecule. It is well known from UHV experiments carried out at ∼800 K, and therefore directly relevant to our work, that the catalytic decomposition of unsaturated molecules is rapid on surfaces of the platinum metals [15,[17][18][19] the kinetics of combustion being dominated by the reaction of atomic carbon and hydrogen with oxygen adatoms. At lower temperatures the higher response to 1-butene than toluene implies a larger sticking coefficient of the former on the oxygen-covered Pt surface.…”

Enhanced Olefin Production from Renewable Aliphatic Feedstocks and Co-Fed Lignin Derivatives Using Experimental Surrogates by Millisecond Catalytic Partial Oxidation

“…[45][46][47] Rapid dehydrogenation and hydrogen desorption would result in relatively immobile carbon clusters located on the catalyst surface. 52 To remove these carbon clusters from the surface, the carbon would likely have to be oxidized with coadsorbed oxygen.…”