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- ItemPolymeric Membranes With Sufficient Thermo‐Mechanical Stability to Deploy Temperature Enhanced Backwash(Weinheim : Wiley-VCH, 2021) Aumeier, Benedikt M.; Vollmer, Fabian; Lenfers, Simon; Yüce, Süleyman; Wessling, MatthiasThe alternative membrane cleaning method Temperature Enhanced Backwash exploits elevated temperatures of typically 125 °C to realize high shear rate. This exceeds usual operating temperatures by far. Therefore, the thermo-mechanical properties of polymeric membranes were investigated. A repeated load cycle testing was suited and sensitive to detect the failure of membrane material and potting. All tested PES membranes showed to be stable during the repeated load cycle testing. The potting adhesive may be decisive, thus, a tensile test at 125 °C is proposed. © 2021 The Authors. Chemie Ingenieur Technik published by Wiley-VCH GmbH
- ItemCo-generation of Ammonia and H2 from H2O Vapor and N2 Using a Membrane Electrode Assembly(Weinheim : Wiley-VCH, 2020) Kugler, Kurt; Kriescher, Stefanie M.A.; Giela, Martin; Hosseiny, Schwan; Thimm, Kristof; Wessling, MatthiasThe direct electrochemical synthesis of NH3 from nitrogen and water vapor without the use of a fossil carbon source is highly desired. This synthesis is a viable option to store energy and produce fertilizer precursors. Here, a new Pt-free membrane electrode assembly is presented. An electrochemical membrane reactor demonstrates the feasibility of co-generating NH3 and H2 directly from nitrogen and water vapor at ambient conditions. An unprecedented high NH3-specific current efficiency of up to 27.5% using Ti as cathodic catalyst is reported. The co-generation can be tuned by the balance of process parameters. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim