Witryna30 sty 2015 · Nafion-H and Nafion SAC-13 are efficient solid Brønsted acid catalysts for the preparation of trifluoromethyl ketimines from benzylamines and trifluoromethylated ketones in high yields. A finely ... Witryna10 kwi 2024 · Nafion solution and Nafion 212 membrane were purchased from Dupont. 2.2. Preparation of ZNs. The ZNs were prepared by the secondary hydrothermal growth of silicalite ... The molar composition of precursor sol was 80 TEOS:3.75 dC5:20 KOH:9500 H 2 O, and the overall molar ratio of Si to Al in the reaction sol was …
Nafion and modified-Nafion membranes for polymer electrolyte fuel …
Witryna28 cze 2024 · The electrochemical CO2 reduction reaction (CO2RR) is a promising technology for converting waste CO2 into chemicals which could be used as feedstock for the chemical industry or as synthetic fuels. The technological viability of this process, however, is contingent on finding affordable and efficient catalysts. Recently, carbon … Witryna18 mar 2024 · Nafion™ polymer functions as an acid catalyst due to the strongly acid properties of the sulfonic acid group. Nafion™ polymer functions as an ion exchange resin when exposed to solutions. Nafion™ polymer very readily absorbs water, from the vapor phase or from the liquid phase. Each sulfonic acid group will absorb up to 13 … csx freight train example prices
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Nafion is a brand name for a sulfonated tetrafluoroethylene based fluoropolymer-copolymer discovered in the late 1960s by Dr. Walther Grot of DuPont. Nafion is a brand of the Chemours company. It is the first of a class of synthetic polymers with ionic properties that are called … Zobacz więcej Nafion can be produced as both a powder resin and a copolymer. It has various chemical configurations and thus several chemical names in the IUPAC system. Nafion-H, for example, includes the following … Zobacz więcej Nafion derivatives are first synthesized by the copolymerization of tetrafluoroethylene (TFE) (the monomer in Teflon) and a derivative of a … Zobacz więcej The morphology of Nafion membranes is a matter of continuing study to allow for greater control of its properties. Other properties such as water management, hydration … Zobacz więcej Normal Nafion will dehydrate (thus lose proton conductivity) when the temperature is above ~80 °C. This limitation troubles the design of fuel cells because higher temperatures are desirable for better efficiency and CO tolerance of the platinum … Zobacz więcej The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: • It … Zobacz więcej Nafion's properties make it suitable for a broad range of applications. Nafion has found use in fuel cells, electrochemical devices, chlor … Zobacz więcej • What Nafion Membrane is Right for an Electrolyzer / Hydrogen Generation? • Homepage of Walther G. Grot Zobacz więcej WitrynaO) at 23℃ for 48 h, then repeatedly rinsed in distilled water to remove the excess salt. Finally, the treated membranes were dried at 60℃ for 24 h to ensure moisture removal from the samples before use. Nafion™ consists of a perfluoroethylene backbone with flexible perfluorinated vinyl ether side chains terminated by a sulfonic acid group ... Witryna30 sty 2015 · Nafion-H and Nafion SAC-13 are efficient solid Brønsted acid catalysts for the preparation of trifluoromethyl ketimines from benzylamines and trifluoromethylated … earn money using apps