Surface coupling of methyl radicals for efficient low-temperature oxidative coupling of methane

Productivity Enhancement for the Oxidative Coupling of Methane in Adiabatic Layered-Bed Reactors

“…75 Additionally, exploiting the synergy between catalysts characterized by different activities and selectivities is very recently being proposed not only for layered beds but also for homogeneous packed beds loaded with mixtures of catalysts. 76,77 In those cases, instead of the layer thickness, the mass fraction of each catalyst in the mixture could be considered as a tunable parameter to optimize the bed composition. Concerning the STY, the values achieved in this study for the layered-bed configurations are in the higher range of the so-called "window of reality" for a catalytic process, i.e., in the desired range of 1−10 mol s −1 m r −3…”

Cost‐Effective Adsorption of Oxidative Coupling‐Derived Ethylene Using a Molecular Sieve

“…CH 4 is obtained from natural gas [5], shale gas [6], and biomass-derived biogas [7]. As the attempts to convert CH 4 -containng gases into more exploitable forms are gathering pace [8], processes such as the oxidative coupling of CH 4 (OCM) reaction are gaining importance [9].…”

Editorial: Heterogeneous Catalysis for Methane Activation

“…

Editorial on the Research Topic Heterogeneous Catalysis for Methane ActivationDirectly converting methane into value-added chemicals and fuels is a "dream reaction" in heterogeneous catalysis because it allows abundant natural gas and shale gas to be used as C1 building block for producing chemicals (Zou et al, 2021). The high molecular stability, however, makes it difficult to directly convert methane into desired chemicals in an economically attractive way.

…”

“…Direct methane conversion reactions can operate at both high temperature and low temperature. Thermocatalytic direct non-oxidative methane conversion (DNMC) and oxidative coupling of methane (OCM) are usually conducted at high temperatures (>900 K) as they require high temperature to activate methane on the catalyst surface and desorb methyl radicals into gas phase for following transformation ( Zou et al, 2021 ). With the development in precision synthesis, advanced in-situ characterization, and comprehensive theoretical modelling, the knowledge on OCM and DNMC has advanced considerably.…”

“…The latter is viewed as a “miracle” and has not been achieved till recently. Zou et al (2021) demonstrated that 5 wt% Na 2 WO 4 /SiO 2 (5NaWSi) can capture CH 3 ∙ radicals desorbed from La 2 O 3 and selectively convert them into C 2 species on the catalyst surface. A bifunctional OCM catalyst system, which use La 2 O 3 as the methane activation center and 5NaWSi as CH 3 · coupling center, exhibits much improved C 2 selectivity and achieves a C 2 yield up to 10.9% at 570°C.…”