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Low-temperature and fast kinetics for CO2 sorption using Li6WO6 Nanowires Muhammad Zain Akram, Veerendra Atla, Apolo Nambo, Babajide Patrick Ajayi, Jacek B. Jasinski, Juan He, Jian Ru Gong, and Mahendra K. Sunkara Nano Lett., Just Accepted Manuscript • DOI: 10.1021/acs.nanolett.8b01529 • Publication Date (Web): 06 Jul 2018 Downloaded from http://pubs.acs.org on July 7, 2018
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Nano Letters
Low-temperature and fast kinetics for CO2 sorption using Li6WO6 nanowires Muhammad Zain Akram,a,b,c,† Veerendra Atla,b,d,† Apolo Nambo,b,d Babajide Patrick Ajayi,b Jacek B. Jasinski,b Juan He,d Jian Ru Gong,a,c,* and Mahendra Sunkara b,* a
Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience, CAS Key
Laboratory of Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China. b
Conn Center for Renewable Energy Research, University of Louisville, Louisville, Kentucky
40292, United States. c
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China.
d
Advanced Energy Materials, LLC, 404 Production Ct., Louisville, Kentucky 40299, United
States. These authors contributed equally to this work.†
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ABSTRACT. In this paper, lithium hexaoxotungstate (Li6WO6) nanowires were synthesized via facile solid-state reaction and were tested for CO2 capture applications at both low (700°C). Under dry conditions, the nanowire materials were able to capture CO2 with a weight increment of 12% in only 60 seconds at operating temperature of 710 °C. Whereas, under humidified ambience, Li6WO6 nanowires capture CO2 with weight increment of 7.6% at temperatures as low as 30-40 °C within a time-scale of one minute. It was observed that the CO2 chemisorption in Li6WO6 is favored in the oxygen ambience at higher temperatures and in the presence of water vapor at lower temperatures. Nanowire morphology favors the swift lithium supply to the surface of lithium rich Li6WO6, thereby enhancing the reaction kinetics and lowering time scales for high capacity adsorption. Overall, high chemisorption capacities, superfast reaction kinetics, wide range of operating temperatures and reasonably well recyclability make 1-D Li6WO6 materials highly suitable for various CO2 capture applications.
KEYWORDS: Li6WO6, nanowires, CO2 capture, low temperature, superfast kinetics, chemisorption.
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Nano Letters
Anthropogenic greenhouse gas emissions are responsible for serious environmental challenges like global warming, and among these gases carbon dioxide (CO2) is known to be the major contributor towards global warming effects.1 Rapid industrialization and the fossil fuel power plants are the main culprit of the ever increasing CO2 concentration in the atmosphere. Since the CO2 emissions are mainly in the form of flue gases from fossil fuel combustion, equipping modern conventional power plants with efficient carbon capture and storage technology could significantly reduce CO2 release to the atmosphere.2 Current strategies for CO2 removal from the flue gas streams include membrane separation, absorption via solvents, and adsorption using solid sorbent materials.3 However, in the past decade, CO2 capture using solid sorbents has particularly attracted immense attention from both academic and industrial fields.4 To exploit solid sorbents in post-combustion carbon capturing and storage, it is highly desirable that the material is capable of operating efficiently in a wide range (low and high) of temperatures. There is a strong interest in developing novel materials that possess efficient CO2 sorption capacity, adequate thermal stability, recyclability at high temperatures and ultrafast sorption kinetics. Among different types of materials tested for CO2 capture, lithium-based metal oxides have proven to be highly efficient. Extensive research on materials such as lithium aluminate,5 lithium zirconate,6, 7 lithium cuprate,8, 9 and lithium silicate10, 11 has been done since most of the lithium ceramics are capable of performing CO2 chemisorption at elevated temperature ranges with the added benefit of recyclability.12, 13 Meanwhile, a few lithium based sorbents have been proposed to possess CO2 capturing abilities under humidified conditions at low temperature range
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