Assessment of the sorption capacity and regeneration of carbon dioxide sorbents using thermogravimetric methods
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Assessment of the sorption capacity and regeneration of carbon dioxide sorbents using thermogravimetric methods Dominika Bukalak • Izabela Majchrzak-Kuce˛ba Wojciech Nowak
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Received: 12 October 2012 / Accepted: 11 February 2013 / Published online: 13 March 2013 Ó The Author(s) 2013. This article is published with open access at Springerlink.com
Abstract Adsorption methods using solid sorbents are an alternative to the absorption technology in the processes of purification gases from carbon dioxide. There is a need to rapidly assess the suitability of sorbents for use it in PSA, TSA, or VPSA installations. Important parameters which determine the quality of the sorbent are the sorption capacity of sorbent, selectivity to CO2 and the possibility of regeneration. This paper presents the results of sorption/desorption of CO2 study on the impregnated porous materials using thermogravimetric methods. Thermogravimetry allows for rapid assessment of sorption capacity and regeneration of the sorbents. Specially selected temperature program allowed to determine the sorption capacity of sorbents depending on the concentration of CO2 in the gas mixture and temperature. Degree of sorbent purification was determined in desorption process. Keywords Adsorption Physicochemical sorbents Sorption capacity Thermal analysis
Introduction The problem of greenhouse gases emissions has become one of the main priorities of the European Union’s energy policy. These gases, such as methane, ozone, and carbon dioxide, are produced naturally and as a result of human activities. The source of CO2 production are mainly
D. Bukalak (&) I. Majchrzak-Kuce˛ba W. Nowak Faculty of Environmental Engineering and Biotechnology, Institute of Advanced Energy Technologies, Czestochowa University of Technology, ul. Da˛browskiego 73, 42-200 Czestochowa, Poland e-mail: [email protected]
processes such as coal combustion, generation of electricity and heat. According to the literature [1] 80 % of the world energy supply belongs to fossil fuels, which causes 30 % of anthropogenic carbon dioxide emissions. In recent years, CO2 capture technology has been significantly developed. Currently, it includes the capture of CO2 before combustion, combustion in oxygen-enriched atmosphere, and CO2 capture after combustion. Separation from flue gases after combustion can take place by adsorption, membrane separation, cryogenic, and currently the most widely used chemical absorption [2]. Membrane separation process involves the use of two types of membranes, the first separator is designed to separate the feed gas stream captured agent, and in the case of adsorption of carbon dioxide membrane passes through the membrane and is then picked up by located on the other side of the adsorption liquid [2]. Cryogenic separation process is compressed and cooled to a suitable temperature and then the separation of gas in a liquid medium. Adsorption using dry sorbents is the physical attraction between the solid surface and the gas. Currently used adsorbents are acti
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