Direct non‐oxidative methane conversion (DNMC) has been recognized as a single‐step technology that directly converts methane into olefins and higher hydrocarbons. High reaction temperature and low catalyst durability, resulting from the endothermic reaction and coke deposition, are two main challenges. We show that a millisecond catalytic wall reactor enables stable methane conversion, C2+ selectivity, coke yield, and long‐term durability. These effects originate from initiation of the DNMC on a reactor wall and maintenance of the reaction by gas‐phase chemistry within the reactor compartment. The results obtained under various temperatures and gas flow rates form a basis for optimizing the process towards lighter C2 or heavier aromatic products. A process simulation was done by Aspen Plus to understand the practical implications of this reactor in DNMC. High carbon and thermal efficiencies and low cost of the reactor materials are realized, indicating the technoeconomic viability of this DNMC technology.
It takes two to transfer: A synthetic CuI metalloprotein undergoes bimolecular photoinduced electron transfer in the inverted Marcus regime. The buried CuI4S4(N/O)4 cofactor (purple) has a high reorganization energy and experiences weak electronic coupling to electron acceptors (Q) in the bulk solvent. This lowers kET below the diffusion limit and allows observation of inverted Marcus behavior.
The effect of compressed CO 2 on the properties of sodium bis(2-ethylhexyl) sulfosuccinate/water/isooctane reverse micelles was investigated by steady-state and time-resolved fluorescence spectroscopic techniques. With the solvatochromic fluorescent probe 6-propionyl-2-(dimethylamino)-naphthalene, the steady-state fluorescence spectroscopy indicates a changed environment in multiple microregions of the reverse micelles with increasing CO 2 pressure. Quantitative estimates for the micropolarities of micellar cores at different pressures were carried out in terms of the empirical polarity parameter E T (30). The results show that E T ( 30) is gradually increased with the pressure. The emission of 8-anilino-1-naphthalenesulfonic acid indicates a reduced viscosity inside the micellar cores. Its reduced lifetime characterizes the dynamic property of solvent reorientation within micellar cores increases with the increasing CO 2 pressure.
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