Oxidative Dehydrogenation of Ethane over a Pt-Coated Monolith versus Pt-Loaded Pellets: Surface Area and Thermal Effects

Recent Advances in Transition Metal Catalyzed Oxidation of Organic Substrates with Molecular Oxygen

“…Most of the data reported on the partial oxidation of light alkanes with platinum-based catalysts refer to low surface area Pt-coated Al 2 O 3 foam monoliths. − Schmidt and co-workers reported very high yields of alkenes in the ODH of C 2 −C 6 alkanes over Pt-coated α-Al 2 O 3 foam monoliths operating adiabatically at short contact times (a few milliseconds) under atmospheric pressure and at 700−900 °C 140a. In the cases of C 2 −C 4 alkanes, almost complete conversion of the alkanes and selectivities to alkenes of >60% are reported.…”

Sensitivity of process efficiency to reaction routes in exhaust-gas reforming of diesel fuel

“…The associated exotherm in turn leads to an increase in the mass transfer coefficient, which is dependent on diffusivity and gas viscosity, both of which change as a function of temperature [14]. Compared to the typical flat profile for a simple exothermic reaction in an adiabatic ceramic bed [15], the relatively steep decline in temperature is indicative of a consecutive endothermic reaction.…”

Short Contact‐Time Reactors

“…In further studies, it was found that the addition of a wash-coat onto the monolith walls [57], as well as the use of high-surface-area alumina pellets [102], strongly reduced ethylene selectivity. These observations agreed well with a heterogeneous-homogeneous mechanism, as increased catalyst surface areas increase the relative contributions of catalytic versus gas-phase reactions, and the results hence again indicate that catalytic reaction are not significantly contributing to the formation of olefins.…”