Abstract
Parametric effect of moisture and influence of operating variables on the adsorption behaviour of polyaspartamide during CO2 capture was investigated in this study using experimental and modelling approach. Individual effects of operating conditions (e.g. pressure, temperature and gas flow rates) as well as the effect of moisture on the adsorption capacity of polyaspartamide were methodically investigated using Dubinin–Raduskevich model. Results from the investigations reveal that the presence of moisture in the flue gas had an incremental effect on the adsorption capacity of polyaspartamide; thereby showcasing the potential of polyaspartamide as a suitable hydrophilic material for CO2 capture in power plants. In addition, pressure, temperature and gas flow rates at 200 kPa, 403 K, and 1.5 mL/s, respectively, significantly influenced the CO2 adsorption capacity of polyaspartamide. Physisorption and chemisorption both governed the adsorption process while equilibrium studies at different temperatures showed that Langmuir isotherm could adequately describe the adsorption behaviour of the material with best fit with R2 > 0.95.
Highlights
Coal is one of the world’s cheapest and abundant fossil fuel with a wide range of applications in power generation, transport systems and thermal energy production (Chitsiga et al 2018)
Results from the investigations reveal that the presence of moisture in the flue gas had an incremental effect on the adsorption capacity of polyaspartamide; thereby showcasing the potential of polyaspartamide as a suitable hydrophilic material for CO2 capture in power plants
Behaviour of polyaspartamide during CO2 capture was studied under different experimental conditions; including gas flow rate, adsorption temperature, operating pressure in a packed bed adsorption column while the effect of moisture on the adsorption capacity of polyaspartamide was theoretically investigated using a mathematical modelling approach
Summary
Coal is one of the world’s cheapest and abundant fossil fuel with a wide range of applications in power generation, transport systems and thermal energy production (Chitsiga et al 2018). Environmental Engineering and Management Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam. Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam power generation or switching to other alternative clean energy sources will make power generation very expensive and unaffordable in most developing countries (Sekoai et al 2018; Yoro and Sekoai 2016). CO2 adsorption capacity of these adsorbents tend to decline rapidly in the presence of moisture with a slight increase in temperature (Xu et al 2011) In response to these challenges, polyaspartamide was recently developed for CO2 capture but the effects of operating conditions on its behaviour during the adsorption of CO2 has not been adequately reported in open literature.
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