Sorbent design for CO2 capture under different flue gas conditions

Abstract

Please cite this article as: Marco-Lozar, J.P., Kunowsky, M., Suárez-García, F., Linares-Solano, A., Sorbent design for CO 2 capture under different flue gas conditions, Carbon (2014), doi: http://dx.doi.org/10.1016/j.carbon. 2014.01.064This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Sorbent design for CO AbstractCO 2 capture by solid sorbents is a physisorption process in which the gas molecules are adsorbed in a different porosity range, depending on the temperature and pressure of the capture conditions. Accordingly, CO 2 capture capacities can be enhanced if the sorbent has a proper porosity development and a suitable pore size distribution. Thus, the main objective of this work is to maximize the CO 2 capture capacity at ambient temperature, elucidating which is the most suitable porosity that the adsorbent has to have as a function of the emission source conditions. In order to do so, different activated carbons have been selected and their CO 2 capture capacities have been measured. The obtained results show that for low CO 2 pressures (e.g., conditions similar to post-combustion processes) the sorbent should have the maximum possible volume of micropores smaller than 0.7 nm. However, the sorbent requires the maximum possible total micropore volume when the capture is performed at high pressures (e.g., conditions similar to oxy-combustion or pre-combustion processes). Finally, this study also analyzes the important influence that the sorbent density has on the CO 2 capture capacity, since the adsorbent will be confined in a bed with a restricted volume.

Gas storage scale-up at room temperature on high density carbon materials

“…Thus, higher total micropore volumes (V DR (N 2 )) lead to higher adsorption capacities. Based on our previous results [13,14,[35][36][37], Figure 3 (b) Figure 3. CO 2 adsorption capacity at 25ºC and up to 30 bar versus micropore volume on (a) gravimetric, and (b) volumetric basis for a selection of carbon samples [13,14,36,37].…”

“…bar, there exists a linear correlation between adsorption capacity and the micropore volume [13,14,[35][36][37]. Thus, higher total micropore volumes (V DR (N 2 )) lead to higher adsorption capacities.…”

Highly porous activated carbon materials from carbonized biomass with high CO2 capturing capacity

“…It is an indisputable fact that fossil fuel consumption contributes a lot of CO 2 emission, because the largest emission from fossil fuel power plants and coal fired plants is CO 2 [4,5]. Accordingly, in the carbon management process, carbon capture and separation (CCS) has been regarded as a desirable mean to reduce carbon dioxide emission into the atmosphere from fossil fuel combustion and to limit climate destabilization [6]. The term "CCS" includes a selective removal of CO 2 from industrial processes, the compression of pure CO 2 into a supercritical fluid, transportation to an injection site, and finally a permanent subterranean or submarine storage [7,8].…”

A site trial demonstration of CO 2 capture from real flue gas by novel carbon fibre composite monolith adsorbents

“…Pore size distribution profile of the carbon adsorbents shown in Fig. 6, reveals the presence of small micropores less than 6Å, which are mostly responsible for the CO 2 capture capacity at 298 K and at atmospheric pressure (Lu et al, 2014;Wang et al, 2014;Marco-Lozar et al, 2014). To the best of our knowledge, the CO 2 adsorption capacities achieved by CSIRO composites are among the highest, compared to other reported porous carbon based solid adsorbents prepared by physically activation.…”