Abstract
At present, mitigating carbon emissions from energy production and industrial processes is more relevant than ever to limit climate change. The widespread implementation of carbon capture technologies requires the development of cost-effective and selective adsorbents with high CO2 capture capacity and low thermal recovery. Coal fly ash has been extensively studied as a raw material for the synthesis of low-cost zeolite-like adsorbents for CO2 capture. Laboratory tests for CO2 adsorption onto coal fly ash zeolites (CFAZ) reveal promising results, but detailed computational studies are required to clarify the applicability of these materials as CO2 adsorbents on a pilot and industrial scale. The present study provides results for the validation of a simulation model for the design of adsorption columns for CO2 capture on CFAZ based on the experimental equilibrium and dynamic adsorption on a laboratory scale. The simulations were performed using ProSim DAC dynamic adsorption software to study mass transfer and energy balance in the thermal swing adsorption mode and in the most widely operated adsorption unit configuration.
Highlights
The diffraction pattern of the reference Na-X taken from the International Zeolite Association (IZA) database is presented for comparison [22]
Simulation studies that have been previously performed describe the dynamic adsorption of CO2 on coal fly ash zeolites (CFAZ) obtained by magnetic homogenization of the reaction mixtures, which are characterized by a lower degree of zeolitization [21]
When comparing the breakthrough curves of CO2 adsorption on CFAZ, obtained by the two methods of homogenization, it was found that the time after which 50% of the initial concentration of the adsorbate in the effluent (T1/2 ) was registered is about 20 min for those synthesized by magnetic homogenization and 3.6 min for the ultrasonically treated samples, while the dynamic adsorption capacities are 99 mg/g and
Summary
4% because of the economic collapse caused by the COVID-19 pandemic [1]. This reduction in CO2 emissions is not sustainable, and after the normalization of life and industry, their high levels will return. In the period 2021–2030, the European Union (EU) is implementing the fourth phase of its long-term strategy to limit greenhouse gas emissions (GHGEs). During this period, GHGEs allowances are reduced by 2.2% per year and are managed by the European Emissions Trading System. The energy sector and industry will be supported by financial mechanisms to meet innovation and investment in low-carbon technologies; the so called European Green
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