A highly selective catalyst based on mesoporous zeolites for the production of C5–C11 isoparaffins from syngas has been developed. The selectivity to C5–C11 hydrocarbons over Ru/meso‐ZSM‐5 reaches about 80 % with a ratio of isoparaffins to n‐paraffins of 2.7:1. The mesoporous structure and the unique acidity of meso‐ZSM‐5 play key roles in tuning the product selectivity by controlling the secondary hydrocracking reactions.
Binäre Cokatalysatoren aus Pt und Cu2O mit einer Kern‐Schale‐Struktur verstärken die photokatalytische Reduktion von CO2 mit H2O zu CH4 und CO. Auf der Cu2O‐Schale findet die bevorzugte Aktivierung und Umwandlung von CO2 statt, während der Pt‐Kern die photogenerierten Elektronen aus dem TiO2‐Material zieht. Die abgeschiedene Cu2O‐Schale auf den Pt‐Nanopartikeln unterdrückt die Reduktion von H2O zu H2 (siehe Bild).
Ein hoch selektiver Katalysator für die Produktion von C5‐ bis C11‐Isoparaffinen aus Synthesegas beruht auf einem mesoporösen Zeolith. Die Selektivität von Ru/meso‐ZSM‐5 für diese Kohlenwasserstoffe reicht an 80 % heran, wobei das Verhältnis von Isoparaffinen zu n‐Paraffinen 2.7:1 beträgt. Die mesoporöse Struktur und die Acidität von meso‐ZSM‐5 sind entscheidend für die Produktselektivität in sekundären Hydrocrack‐Reaktionen.
The three-dimensional Dirac semimetal (3D DSM) is a new class of material with a slew of electronic and optical properties in common with graphene, while structurally having a bulk form like real metals. In particular, the Dirac band structure of 3D DSM conferred very high optical nonlinearities much like the case for graphene. Consequently, we found that 3D DSM has respectable nonlinear plasmonic performance in comparison with graphene, while retaining the structural benefits of bulk metals, having reduced passive plasmonic losses, and is much easier to handle in fabrication facilities. 3D DSM is expected to play a strong role in providing strong optical nonlinearities for all-optical switching and at the same time offering a superior platform for nanophotonic device integration.
The right mix! Significant synergistic effects exist between RuOx and CuOx for the propylene epoxidation by oxygen. While supported CuOx and RuOx alone both catalyzed the formation of acrolein as the main partial oxidation product, the combination of RuOx and CuOx in an appropriate ratio afforded an efficient and stable epoxidation catalyst. The supported nanocomposites with the direct contact interface between CuOx and RuOx were proposed for propylene oxide formation (see figure).
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