Template Technique for Synthesis of CaO-based Sorbents Conference attendances
Language | Английский | ||||||
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Participant type | Стендовый | ||||||
URL | http://www.imms9.org/wp-content/uploads/2015/08/15_IMMS9_Program_web.pdf | ||||||
Conference |
9th International Mesostructured Materials Symposium (IMMS9) 17-20 Aug 2015 , Brisbane |
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Abstract:
Emissions of large amounts of CO2 to the atmosphere, mostly as a by-product of burning fossil fuels in man-made processes, are contributing to climate change. Among the options for reducing greenhouse gas emissions there is CO2 capture from the large stationary sources. It was proposed in many works to use calcium-based sorbents for effective CO2 capture from gases at high temperatures. It is well known that textural properties drastically effects to sorption/regeneration performance of sorbent during cycles under the conditions of CO2 capture process [1]. Different methods involving direct thermal decomposition of the,
Ca-containing precursors, wet chemistry, sol-gel technique and flame pyrolysis, were applied to modify porous structure of Ca-based sorbents. In mentioned cases porosity and pore size distribution are regulated by chemical nature of precursors and conditions of experiment. In parallel with interest growing to CaO-sorbents novel template approach started emerging and developing. In general this technique consists of two steps: at first step the template particles with definite shape and size are introduced to matrix media. After that
matrix material solidifies and template is deleted. Thus, template synthesis with nanocasting is a direct technique for design materials with appropriate porosity and pore size distribution [2]. We have used template approach to introduce additional porosity in CaO-based sorbents and to arrange theirs pore size distribution. The effect of synthetized sorbents porous structure on their sorption performance during repetitive carbonation/regeneration cycles was investigated.
The pore size distribution of prepaid sorbents drastically depends on the quantity and the size of introduced template, but also on the sorbent preparation conditions. The introducing of template significantly increases the rate both of sorbent carbonation and calcination reactions.
of sorbent with template for more than 1 order of magnitude in comparing with the pure
sample without template. In this way template approach seems to be a perspective technique
to prepare the CaO-based sorbents with better carbonation/calcination performance [3] it is
also a subsequent development and improvement of synthesis technique required.
References
[1] F.N. Ridha, V. Manovic, Y. Wu, A. Macchi, E.J. Anthony, Post-combustion CO2 capture by formic
acid-modified CaO-based sorbents, Int. J. Greenh. Gas Control. 16 (2013) 21–28.
[2] K. A. Sashkina, V.S. Labko, N. a. Rudina, V.N. Parmon, E. V. Parkhomchuk, Hierarchical zeolite FeZSM-5
as a heterogeneous Fenton-type catalyst, J. Catal. 299 (2013) 44–52.
[3] D. Alvarez, J.C. Abanades, Pore-size and shape effects on the recarbonation performance of calcium oxide
submitted to repeated calcination/recarbonation cycles, Energy and Fuels. 19 (2005) 270–278.
Cite:
Derevshhikov V.S.
, Semeykina V.S.
, Bitar J.
, Parkhomchuk E.V.
, Okunev A.G.
Template Technique for Synthesis of CaO-based Sorbents
9th International Mesostructured Materials Symposium (IMMS9) 17-20 Aug 2015
Template Technique for Synthesis of CaO-based Sorbents
9th International Mesostructured Materials Symposium (IMMS9) 17-20 Aug 2015