Abstract
A series of porous carbon materials obtained from biomass waste have been synthesized, with different morphologies and structural properties, and evaluated as potential adsorbents for CO2 capture in post-combustion conditions. These carbon materials present CO2 adsorption capacities, at 25 oC and 101.3 kPa, comparable to those obtained by other complex carbon or inorganic materials. Furthermore, CO2 uptakes under these conditions can be well correlated to the narrow micropore volume, derived from the CO2 adsorption data at 0 oC (VDRCO2). In contrast, CO2 adsorption capacities at 25 oC and 15 kPa are more related to only pores of sizes lower than 0.7 nm. The capacity values obtained in column adsorption experiments were really promising. An activated carbon fiber obtained from Alcell lignin, FCL, presented a capacity value of 1.3 mmol/g (5.7 %wt). Moreover, the adsorption capacity of this carbon fiber was totally recovered in a very fast desorption cycle at the same operation temperature and total pressure and, therefore, without any additional energy requirement. Thus, these results suggest that the biomass waste used in this work could be successfully valorized as efficient CO2 adsorbent, under post-combustion conditions, showing excellent regeneration performance.
Highlights
The increase of climate-related natural disasters or the fact that since 2000, years are among the hottest ever registered,1 have reinforced the unequivocal need of diminishing greenhouse gases emissions, those of CO2 [IPCC (Intergovernmental Panel on Climate Change), 2007; IEA, 2013], and is leading governments to develop a series of roadmaps, which aim at moving forward to a low carbon economy
A series of carbon materials with different morphologies and porous structural properties have been synthesized from biomass byproducts and residues and evaluated as potential adsorbents for CO2 capture under post-combustion conditions
Equilibrium studies of these porous materials showed that CO2 capacities at 25°C and 101.3 kPa are comparable to those reported for other carbon materials
Summary
The increase of climate-related natural disasters or the fact that since 2000, years are among the hottest ever registered, have reinforced the unequivocal need of diminishing greenhouse gases emissions, those of CO2 [IPCC (Intergovernmental Panel on Climate Change), 2007; IEA, 2013], and is leading governments to develop a series of roadmaps, which aim at moving forward to a low carbon economy. The current and future continuously growing energy demands along with the immaturity of most alternative technologies make it evident that fossil fuels will continue to be used in many industrial processes (European Commission, 2011). Within this framework, carbon capture and storage (CCS) has been identified as one of the key technologies that could contribute in a greater degree to reach the CO2 emission reduction targets [IPCC (Intergovernmental Panel on Climate Change), 2005; European Commission, 2013; IEA, 2013]. Availability, low cost, and easy of regeneration are key factors to ensure the feasibility of the overall adsorption process (Plaza et al, 2010, 2014; Samanta et al, 2012; Lee and Park, 2015; Ben-Mansour et al, 2016)
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