Carbon Dioxide Capture from Flue Gas Using Tri-Sodium Phosphate as an Effective Sorbent

Abstract

Fossil fuels are dominant as an energy source, typically producing carbon dioxide (CO2) and enhancing global climate change. The present work reports the application of low-cost tri-sodium phosphate (TSP) to capture CO2 from model flue gas (CO2 + N2) mixture, in a batch mode and fixed-bed setup. It is observed that TSP has a high CO2 capture capacity as well as high CO2 selectivity. At ambient temperature, TSP shows a maximum CO2 capture capacity of 198 mg CO2/g of TSP. Furthermore, the CO2 capture efficiency of TSP over a flue gas mixture was found to be more than 90%. Fresh and spent materials were characterized using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and Fourier transformed infrared spectroscopy (FTIR). Preliminary experiments were also conducted to evaluate the performance of regenerated TSP. The spent TSP was regenerated using sodium hydroxide (NaOH) and its recyclability was tested for three consecutive cycles. A conceptual prototype for post-combustion CO2 capture based on TSP material has also been discussed.

CO2 Capture Using Zeolite Synthesized from Coal Fly Ash and Its Subsequent Utilization for Fire Retardation and Dye Removal

“…However, depending on the sorbent materials and their characteristic features, CO 2 sorption may increase or decrease or often may not follow the order with rising temperature while considering wider ranges of pressure. Furthermore, at a low temperature (e.g., 15 °C), there is insufficient energy to drive the forward reaction of CO 2 sorption, while high temperature leads to backward reactions due to the exothermic nature of CO 2 sorption with clay/zeolite or Na + or other functional groups. ,, Therefore, intermediate temperature is considered to get the highest amounts of CO 2 sorption with chemical reaction and pore filling, ,, which can be applied to the increased sorption of SynZ at 45 °C. Thermodynamic parameters (calculated in eqs S3 and S4), including changes of the enthalpy (Δ H ) and Gibbs free energy (Δ G ) in this study, also verify the exothermic (Δ H = −9.702 kJ/mol) nature of CO 2 sorption with SynZ, and the most favorable sorption occurred at 45 °C (Δ G = −7.056 kJ/mol·K) rather than at other studied temperatures (Δ G = −5.254 to −6.310 kJ/mol·K).…”

Single-Ion-Conducting SPP–SPA Blend Hydrogel-Based Pseudo-Solid Polymeric Electrolyte Material for Na+-Ion Constructed Energy Storage Devices

“…The band attributed to P–O–P stretching merged with that of P–O stretching at 832 cm –1 . The band at 862 cm –1 represents the C–H detraction of SPA. − …”

Green and Sustainable Carbon Dioxide Capture in Aqueous l-Valine: Experimental Studies on Process Efficiency and Gas Uptake for Industrial Applications

“…At a given time, the moles of CO 2 consumed can be calculated by the following equation false( normalΔ n normalc normalo normaln normals false) = V g true[ P Z italicR T true] 0 − V g true[ P Z italicR T true] t where p is pressure (in Bar), R is the gas constant (L.bar.K –1 .mol –1 ), T is the temperature (K), V is the volume occupied by the gas inside the reactor, and Z is the compressibility factor which can be calculated from eqs –. Pitzer correlation (eq ) is widely accepted for computing the compressibility factor for the gas sorption process. , The parameters required for the primary equation (Pitzer correlation) can be determined using eqs –: Z = 1 + B P R T = 1 + true( B P normalc normalR T normalc true) P r T r true( B P normalc normalR T normalc …”

“…At a given time, the moles of CO 2 consumed can be calculated by the following equation where p is pressure (in Bar), R is the gas constant (L.bar.K –1 .mol –1 ), T is the temperature (K), V is the volume occupied by the gas inside the reactor, and Z is the compressibility factor which can be calculated from eqs –. Pitzer correlation (eq ) is widely accepted for computing the compressibility factor for the gas sorption process. , The parameters required for the primary equation (Pitzer correlation) can be determined using eqs –: where P c : critical pressure T c : critical temperature P r : reduced pressure T r : reduced temperature ω: acentric factor (0.224 for CO 2 ) B: second virial coefficient …”