Carbon dioxide and nitrogen adsorption on porous copolymers of divinylbenzene and acrylic acid
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Carbon dioxide and nitrogen adsorption on porous copolymers of divinylbenzene and acrylic acid Carlos O. Arean • Elena Groppo • Wei Liu Leticia F. Velasco • Jose B. Parra
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Received: 30 October 2012 / Accepted: 21 December 2012 / Published online: 8 January 2013 Ó Springer Science+Business Media New York 2013
Abstract Porous copolymers of divinylbenzene (DVB) and acrylic acid (AA) having DVB:AA ratios of 6:4, 8:2 and 9:1 were prepared following a distillation-precipitation method, using toluene as the porogenic agent. The materials thus obtained, which showed specific surface area in the range of 380–600 m2 g-1 and pore volume in the range of 0.14–0.18 cm3 g-1, were investigated as possible adsorbents for CO2 capture from the flue gas of coal-fired power stations. For that purpose, the isosteric heat of adsorption (and CO2 adsorption capacity) was analysed from N2 and CO2 adsorption equilibrium isotherms obtained over a temperature range. For CO2, qst resulted to be in the range of 27–31 kJ mol-1 (the highest value corresponding to the 6:4 sample), while for N2 a value of qst & 12 kJ mol-1 was obtained. Equilibrium adsorption capacity for CO2 (at ambient temperature and pressure) showed the value of about 1.35 mmol g-1. These results are discussed in the broader context of corresponding literature data for CO2 capture using protonic zeolites. C. O. Arean Department of Chemistry, University of the Balearic Islands, 07122 Palma de Mallorca, Spain E. Groppo W. Liu Department of Chemistry, NIS Centre of Excellence and INSTM Unita´ di Torino, 10135 Turin, Italy W. Liu State Key Laboratory of Hollow-fiber Membrane Materials and Membrane Processes, School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, People’s Republic of China L. F. Velasco J. B. Parra (&) Instituto Nacional del Carbon, CSIC, Apartado 73, 33080 Oviedo, Spain e-mail: [email protected]
Keywords Poly(DVB-co-AA) porous polymers Gas adsorption CO2 capture
1 Introduction Oil, natural gas and coal, taken together, account for about 80 % of present-day primary energy supply (Van den Berg and Arean 2008). These three carbon-based energy sources (collectively known as fossil fuels) rendered possible the rapid development of our technological civilization that lead to the present level of well-being and comfort. However, CO2 vented to the atmosphere when burning these fossil fuels in power stations constitutes a major factor of ever increasing greenhouse effect and consequent concern about potential adverse effects on climate change. Replacing fossil fuels with cleaner, and renewable, energy sources would provide a way out of this situation in the long run. However, the current high cost of implementing new technologies for electric energy production, added to worldwide increasing energy demand, calls for a mid-term solution to allow the humanity to continue using fossil fuels until cost-effective renewable energy can be implemented on a large scale. Carbon dioxide capture and sequestration (CCS) could cons
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