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- ItemSynthesis of β-Hydroxysulfides from Thiophenols and Disulfides with tert-Butyl Hydroperoxide as the Oxidant and Reactant(Weinheim : Wiley-VCH, 2016) Feng, Jian-Bo; Wu, Xiao-FengA procedure for the oxidative synthesis of β-hydroxysulfides is reported, in which thiophenols or diaryl disulfides are reacted with tert-butyl hydroperoxide (TBHP). In the presence of zinc iodide or potassium iodide, with TBHP as the oxidant and pre-reactant, thiophenols and diaryl disulfides react with the methyl group of tBuOH smoothly and selectivity to give the corresponding 2-methyl-1-(arylthio)propan-2-ols as the terminal products in moderate to good yields.
- ItemTowards a methanol economy based on homogeneous catalysis: methanol to H2 and CO2 to methanol(Cambridge : Soc., 2015) Alberico, E.; Nielsen, M.The possibility to implement both the exhaustive dehydrogenation of aqueous methanol to hydrogen and CO2 and the reverse reaction, the hydrogenation of CO2 to methanol and water, may pave the way to a methanol based economy as part of a promising renewable energy system. Recently, homogeneous catalytic systems have been reported which are able to promote either one or the other of the two reactions under mild conditions. Here, we review and discuss these developments.
- ItemOxidation and Hot Gas Corrosion of Al–Cr–Fe–Ni-Based High-Entropy Alloys with Addition of Co and Mo(Weinheim : Wiley-VCH, 2021) Gabrysiak, Katharina Nicole; Gaitzsch, Uwe; Weißgärber, Thomas; Kieback, BerndMulticomponent, high-entropy alloys (HEAs) are promising candidates for replacing conventional alloys in high-temperature applications. Herein, the high-temperature corrosion of AlCrFeNiX0.5 (X = Co, Mo) is investigated. The samples are tested for their oxidation resistance at temperatures up to 1200 °C for 120 h and their behavior in NaCl/Na2SO4 at 900 °C for 96 h. They are benchmarked against commercial alloys such as FeCrAl. Despite the same contents of Al and Cr, the HEAs form different oxide layers showing very different oxidation resistance. The type of oxide is related to the multiphase microstructure. The samples exhibit different amounts of ordered and unordered body-centered cubic (bcc) phase. The Co-containing specimen shows an oxidation resistance that performs similarly well as FeCrAl. Its behavior is ascribed to the formation of an Al2O3 layer, which is very stable at high temperatures. The sample with X = Mo exhibits an additional Mo-rich sigma phase, thus posing the risk of catastrophic oxidation. However, the Mo-containing HEA is more resistant in the environment of molten salt. Preoxidation treatment at a lower oxygen partial pressure proves to prolong life span of the Mo-containing HEA in hot air. Furthermore, a positive impact on oxidation resistance by addition of Y is affirmed. © 2021 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH.