High-Temperature Activation of Zeolite-Loaded Fiber Sorbents
| Autor: | Guanghui Zhu, Neil A. Stephenson, Achintya Sujan, Yang Luo, William J. Koros, Ryan P. Lively, Hai Du, Rosinski Andrew C, Dong-Yeun Koh, Vinod P. Babu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Sorbent Materials science General Chemical Engineering Sorption 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry Chemical engineering Pyrolytic carbon Fiber 0210 nano-technology Zeolite Glass transition Polyimide |
| Zdroj: | Industrial & Engineering Chemistry Research. 57:11757-11766 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.8b02210 |
| Popis: | Here, we describe the formation of zeolite LiX fiber sorbents and postfabrication activation at temperatures of 350–400 °C for use in air separations. Two polymers were considered as the support matrices for the LiX zeolites: Torlon (polyamide-imide) and Matrimid (polyimide). Torlon-based fiber sorbents exhibit approximately 4% mass loss during the high-temperature (370 °C) activation required for zeolites, which is close to the glass transition temperature of these polymers. This mass loss is accompanied by the formation of pyrolytic side products that ultimately resulted in contamination of the LiX crystals and a 73% reduction in N2 sorption capacity at ambient temperatures. In contrast, Matrimid was found to be suitable for fiber sorbent synthesis with only 10–15% reduction in N2 sorption capacity observed upon the thermal activation. A LiX loading of 73% in monolithic fibers (i.e., no bore) by weight was achievable. Experimental breakthrough tests at 25 °C were conducted on an activated fiber module c... |
| Databáze: | OpenAIRE |
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