Abstract
Positive temperature coefficient of resistivity (PTCR) hollow fibers that exhibit self-regulating heating characteristics have potential applications in temperature-swing adsorption systems (TSA), such as CO2 recovery and drying of compressed air. La-doped BaTiO3 hollow fibers displaying a PTCR effect were produced by phase inverting a casting solution consisting of N-methly-2-Pyrrolidone, polymethyl methacrylate, polyvinylpyrrolidone, BaTiO3, TiO2, and La2O3 through a spinneret into a coagulating waterbath. This was followed by polymer debinding, high temperature sintering between 1350−1400 °C and annealing in air at 1175 °C to produce hollow fibers of the composition Ba0.9975La0.0025TiO3. Hydrothermal synthesis was implemented to deposit an adsorbent porous zeolite X layer within the hollow fiber lumen, which was confirmed by electron dispersive X-ray spectroscopy and CO2 adsorption at 0 °C. Hence, these materials can be applied to energy efficient TSA gas separation processes. The results are discussed in terms of hollow fiber microstructure, adsorption characteristics and electrical properties.
Highlights
Adsorption technologies are ubiquitously employed for the com mercial production of gases [1], such as natural gas separation, air separation [2] to produce N2 and O2, CO2 capture [3,4,5], removal of volatile organic compounds (VOCs), and moisture removal in com pressed air systems [6]
This study describes the synthesis of La-doped BaTiO3 ceramic hol low fibers exhibiting a Positive temperature coefficient of resistivity (PTCR) effect, which were prepared using a phase inversion wet spinning technique
One of the goals of the hollow fiber synthesis was to attain ceramic hollow fibers with a low room temperature resistivity and PTCR effect formed through a phase inversion process
Summary
Adsorption technologies are ubiquitously employed for the com mercial production of gases [1], such as natural gas separation, air separation [2] to produce N2 and O2, CO2 capture [3,4,5], removal of volatile organic compounds (VOCs), and moisture removal in com pressed air systems [6]. Gas separation technologies rely on packed beds, operating on a thermal-pressure swing adsorption-desorption cycle, which have large energy demands, long processing times (up to 8 h), and reduced separation performances [7]. This results in higher production costs and unsatisfactory purity of target species. Due to the low thermal mass, hollow fiber systems can be designed to directly heat the inner adsorbent layer through Joule heating for electrothermal desorption processes [10,11], minimizing waste heat production and requiring far less energy compared to traditional systems
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