Improvement of CO₂ absorption using AL₂O₃ nanofluids in a stirred thermostatic reactor

Abstract

The improvement of CO 2 absorption by Al 2 O 3 nanofluids with deionized water as the base fluid was studied experimentally. The reactor used was a stirred thermostatic reactor, operated batchwise. Pure CO 2 was employed in all the experiments. The content of Al 2 O 3 in nanofluids ranged from 0 to 0.2 % (wt). Sodium dodecyl benzene sulfonate (SDBS) was employed to improve the stability of the nanofluids, and the combined effect of nanoparticles and surfactants on the absorption enhancement was studied. The parameters such as the concentration of Al 2 O 3 nanoparticles and surfactants, the stirring speed, and the ultrasonic time were varied. The results show that the nanoparticle mass fraction and the ultrasonic time have an optimum value for the CO 2 absorption enhancement. The combination of surfactants and nanoparticles improves the enhancement performance of Al 2 O 3 nanofluids more effectively than that without surfactants. With the increase of the stirring speed, the effective absorption ratio in stable nanofluids declines, while in poorly dispersed Al 2 O 3 suspensions, it is increased first and then reduced. The mechanism of the Al 2 O 3 nanofluid enhancing CO 2 absorption is discussed accordingly. The absorption enhancement by the Al 2 O 3 nanofluid is mainly attributable to convective motion induced by the Brownian motion.

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“…Factors that influence Guedes et al [3] Pure Temperature 315.71827 K 315.7 K Lu et al [4] Pure Pressure 101 325 Pa 101 kPa Kianinejad et al [5] Pure Porosity 52.47 % 52 % Abdelaziz et al [6] Pure Length 2.655 m 2.65 m Jeon et al [7] Analytical Surface area 163.9 m 2 · g −1 160 m 2 · g −1 Lin et al [8] Analytical EDS analysis 40.09 wt% 0.40 g · g −1 Jia et al [9] Analytical Viscosity 5.875 cP 5.9 cP Ma et al [10] Derived Selectivity 63.3 63 Vedoy and Soares [11] Derived Solids recovered 25.97 % 26 % Esmailpour et al [12] Derived Air density 0.921 02 kg · m −3 0.92 kg · m −3 Verma et al [13] Derived COD 1000.00 mg · L 1 .00 g · L Moradi et al [14] Derived Activation energy 36.314 kJ · mol…”

Improvement of CO2 absorption by Fe3O4/water nanofluid falling liquid film in presence of the magnetic field

“…There are different methods to remove CO 2 such as absorption, adsorption, membrane separation, chemical looping, etc. [ 1–3 ] The amine‐based chemical absorption process has been used for CO 2 removal from natural gas and other gas streams; however, there are different drawbacks associated with this method, including high energy consumption during solvent regeneration, corrosion, degradation, low absorption rate, and low CO 2 capacity. [ 1–4 ] Gas absorption by liquid phase is one of the most common industrial technologies used to capture pollutant gases.…”

“…[ 1 ] It is well known that CO 2 solubility in liquid phase is a function of temperature and pressure that increases by increasing pressure and decreasing temperature. [ 3 ] Thus, high pressure and low temperature conditions are the desired operating conditions for absorption processes of CO 2 . These operating conditions are energy intensive, which results in high operating costs.…”

“…To mitigate the negative impacts of climate change, CO 2 capture has gained the interest of researchers. [1][2][3][4][5][6] Many studies have been conducted to find solutions to reduce greenhouse gases. There are different methods to remove CO 2 such as absorption, adsorption, membrane separation, chemical looping, etc.…”

“…[1][2][3] The amine-based chemical absorption process has been used for CO 2 removal from natural gas and other gas streams; however, there are different drawbacks associated with this method, including high energy consumption during solvent regeneration, corrosion, degradation, low absorption rate, and low CO 2 capacity. [1][2][3][4] Gas absorption by liquid phase is one of the most common industrial technologies used to capture pollutant gases. [1] It is well known that CO 2 solubility in liquid phase is a function of temperature and pressure that increases by increasing pressure and decreasing temperature.…”