CO2 Gas Flow Rate Research Articles

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

The traditional Solvay process and other modifications that are based on different types of alkaline material and waste promise to be effective in the reduction of reject brine salinity and the capture of CO2. These processes, however, require low temperatures (10–20 °C) to increase the solubility of CO2 and enhance the precipitation of metallic salts, while reject brine is usually discharged from desalination plants at relatively high temperatures (40–55 °C). A modified Solvay process based on potassium hydroxide (KOH) has emerged as a promising technique for simultaneously capturing carbon dioxide (CO2) and reducing ions from reject brine in a combined reaction. In this study, the ability of the KOH-based Solvay process to reduce brine salinity at relatively high temperatures was investigated. The impact of different operating conditions, including pressure, KOH concentration, temperature, and CO2 gas flowrate, on CO2 uptake and ion removal was investigated and optimized. The optimization was performed using the response surface methodology based on a central composite design. A CO2 uptake of 0.50 g CO2/g KOH and maximum removal rates of sodium (Na+), chloride (Cl−), calcium (Ca2+), and magnesium (Mg2+) of 45.6%, 29.8%, 100%, and 91.2%, respectively, were obtained at a gauge pressure, gas flowrate, and KOH concentration of 2 bar, 776 mL/min, and 30 g/L, respectively, and at high temperature of 50 °C. These results confirm the effectiveness of the process in salinity reduction at a relatively high temperature that is near the actual reject brine temperature without prior cooling. The structural and chemical characteristics of the produced solids were investigated, confirming the presence of valuable products such as sodium bicarbonate (NaHCO3), potassium bicarbonate (KHCO3) and potassium chloride (KCl).

Study on atomization mechanism in spray coating of organic paint mixed with high-pressure carbon dioxide as a diluting solvent

The atomization phenomenon in spray coating of organic paint mixed with high-pressure carbon dioxide as a diluting solvent was investigated. Industrial organic paint for automotive body coating was used without any diluting organic solvent. Under high-pressure conditions, CO2 was continuously mixed with the organic paint to reduce its viscosity to spray. The atomization phenomenon was investigated regarding the effects of high-pressure spraying and CO2 vaporization from droplets. The experimental conditions were varied such as the temperature, pressure, GtP (gas to paint ratio: CO2 gas flow rate [g/min]/paint flow rate [g/min]). The average droplet sizes under the CO2 spray at the 150 mm from nozzle (actual spray distance for automotive manufacturing) were measured by using a laser droplet size analyzer. The average droplet size was strongly affected by the fluid conditions (temperature and GtP), and the sizes were varied from 12 to 113 µm under conditions of 20–60 °C and 8–16 MPa. The minimum size of average droplet was 12 µm at 60 °C, 14 MPa, and 0.5 of GtP. The moderate heating (40–60 °C), high pressure (12–16 MPa) and two-phase (CO2-saturated paint and high pressure CO2) fluid spraying under high GtP condition in the nozzle are important factors to produce small and homogeneous droplet.

High selective synthesis of CaCO3 superstructures via ultra-homoporous interfacial crystallizer

Precise regulation of biomimetic mineralization for highly ordered superstructures is one of the perpetual concerns in biomaterial synthesis and crystal engineering. Herein, we propose a ultra-homoporous interfacial crystallizer (UHIC) as a novel interfacial microdevice, which has realized high selective synthesis of CaCO3 superstructures during Gas–Liquid reactive crystallization process. This UHIC with ultra-uniform mass transfer porous channel and interfacial superhydrophilicity render the droplet ultra-homo nucleation site and coordinatively regulate the interfacial nucleation energy. The highly precise microchannel in UHIC can control the CO2 gas flow rate and sufficient interfacial Gas–Liquid diffusion of the CaCO3 pre-nucleation cluster (PNC). By coordinating the PNC diffusion, self-organization and nucleus growth, the proportion of synthesized CaCO3 crystals with spherical and polyhedral structures both increased to higher than 96.77 %, and the crystal size distribution was very uniform (minimum C.V. =11.7%). Fundamental theory of CaCO3 synthesis with UHIC as a desire interfacial reactive were then outlined, which can shed light on the high-selective synthesis of the microscale biomaterials.

Simulation of CO2 Gas Adsorption Process Flow at Cyclone Gas Outlet in Palm Oil Mills Using Computation Fluid Dynamic Simulation

Cyclone separator is equipment used to control emissions from gas flow in industrial processes. The principle of removing particulates from the gas flow in this tool is to use the centrifugal force. The centrifugal force generated from the rotating flow will make dust particles wasted into the cyclone wall where the dust will then fall into the hopper. Adsorption is a series of processes for the accumulation of a substance (adsorbate) on the surface of another substance (adsorbent). Adsorption can occur because of the energy on the surface and the attraction force on the surface. This study aims to obtain a good CO2 adsorption efficiency from modifying the cyclone separator using an adsorption column, analyzing the CO2 gas adsorption process produced from the biomass system at the utility unit boiler station at the Palm Oil Mill (PMO) using a modified cyclone. This simulation was carried out using the Autodesk Inventor Professional 2017 (Student Version) application for the descripction of the tool as a preprocessor and Ansys 2019 R3 (Student Version) applications as a processor and post processor. The variations that were applied included the adsorption column bed height of 3100 mm and 4650 mm, respectively, CO2 gas flow rates of 10, 12.5, 15, 17.5, 20, 22.5 dan 25 m/s and mass loading 0,001 kg/s. The results obtained in the most optimal modification of the cyclone separator are at a bed height of 3100 mm with the highest adsorption percentage 93.437%, the highest flow 91.974% with a pressure drop of 1000 Pa.

Mechanisms of gas temperature variation of the atmospheric microwave plasma torch

The gas temperature is a key parameter that affects the process of microwave plasma chemistry in industrial applications. Based on the molecular emission spectrometry of the A2Σ+→X2Πr electronic system of OH radicals, the gas temperature of the atmospheric air microwave plasma core at different absorbed microwave power levels, gas flow rates, gas humidities, and volume fractions of CO2 in air was analyzed. In the experiment, the absorbed microwave power, gas flow rate, gas humidity, and volume ratio of CO2 in air was varied from 560 to 1750 W, 10 to 24 l min−1, 30% to 95%, and 0% to 40%, respectively. Moreover, the axial gas temperature distribution of the plasma torch was measured. The experimental results showed that (i) the plasma gas temperature mainly ranged from 4000 to 7000 K, (ii) the plasma gas temperature rose with increasing absorbed microwave power but was hardly affected by the feeding gas flow rate, (iii) the plasma gas temperature decreased by ∼400 K for every 20% increase in the fraction of CO2 in air and decreased with increasing gas humidity, and (iv) the plasma torch gas temperature decreased along the axial direction. Due to the lack of a prevailing microwave discharge theory, an in-depth analysis of the mechanisms of gas temperature variation was performed based on the heat balance equation.

Experimental analysis of CO2 frost front behaviour in moving packed beds for cryogenic CO2 capture

In this work, the feasibility of a novel method of cryogenic carbon capture based on carbon dioxide frost deposition onto a cold moving bed is explored. As a gas mixture including CO2 flows through a sufficiently cold packed bed, CO2 is deposited onto the bed material as a frost. As the bed is warmed by the gas stream the frost front advances through the bed. Experimental measurements of the rate of frost advance within a static packed bed are used to set up a moving bed to achieve continuous CO2 removal. Precooled and dry binary gas mixtures of CO2 and nitrogen are used to determine frost front velocity in a capture column. The frost front velocity measured in fixed bed experiments with varying CO2 concentrations and gas flow rates are in the range of 0.4–1 mm/s. The experimental results were used to design a moving bed system that would match this range of frost front velocities so that continuous capture would be possible. Experiments were conducted to investigate the behaviour of temperature profiles within the capture column under moving bed conditions. These show that frost accumulation does not occur and successfully demonstrates continuous cryogenic carbon capture.

Effect of smelting temperature and CO2 gas flow rate on decarburization kinetics between CO2 gas and liquid Fe-C alloy

ABSTRACT The effect of smelting temperature and CO2 flow rate to decarburization kinetics between CO2 and liquid Fe-C alloy were investigated. The decarburization rate caused by CO2 increases with smelting temperature. Compared with low carbon condition (near 0.45 wt pct), the effect of temperature on decarburization rate is more significant under high carbon condition (near 3.5 wt pct). At high carbon content, the decarburization rate increases linearly with CO2 flow rate. And a CO2 decarburization kinetics model considering the influence of bubble diameter, bubble generation frequency, rising velocity and rate controlling step was established. When CO2 transfer in gas phase boundary layer is rate controlling step, the calculated data are in good agreement with the experimental data. It was also found that the effect of CO2 flow rate on the decarburization rate was mainly affected by the reaction surface area, but less on gas phase mass transfer coefficient in current experimental situations.

The Effect of Variation Concentration Sodium Hydroxide (NaOH) on the Structure of Calcium Carbonate (CaCO<sub>3</sub>) Based on Natural Sand

Utilization of abundant natural resources has been an important issue in recent years. CaCO3 was successfully prepared from natural sand by purification bubbling methods with flowing CO2 gas into an aqueous Ca(OH)2 medium with NaOH as catalyst. In the experimental set-up, natural sand was dissolved with different NaOH concentrations of 5, 6, and 7 M, respectively. In the carbonation process, room temperature is used as reaction temperature, while CO2 gas flow rate was carried out at 5 SCFH (Square Cubic Feet per Hour) and the speed of stirring was kept constant. The reaction was occurred around 5 minutes to produce precipitation of CaCO3. The influences of reaction parameters such as the various concentrations of NaOH were studied by using X-ray fluorescence spectrometer (XRF), X-ray powder diffraction (XRD), Particle size analyzer (PSA), and Scanning Electron Microscopy (SEM) to investigate the element composition, crystal structure, size of particles, and morphology of particles, respectively. The results showed that NaOH concentration effected not only on the phases of CaCO3 but also on the microstructure and morphology of CaCO3. Calcite and vaterite phases are observed which have a rhombic and spherical morphology in micro-scale, respectively.

The effect of Fe3O4 nanoparticles on the mass transfer of CO2 absorption into aqueous ammonia solutions

Fe3O4 nanoparticle has been developed as an effective mass transfer promotor for CO2 absorption into aqueous ammonia solutions. The overall volumetric mass transfer coefficients (KGCO2A) were determined for various nanoparticle loadings, nanoparticle sizes, ammonia concentrations, inlet CO2 concentrations and gas flow rates in a bubbling reactor. Results showed that KGCO2A increased with the increase of nanoparticle loadings up to a maximum value and then decreased. With 0.3 g/l nanoparticles, the value of KGCO2A for an ammonia concentration of 4 wt % reached 5.6 × 10−5 mol /(m3 s Pa), 14.5 % higher than that achieved without nanoparticles. Results also showed that KGCO2A had upward trend with the increasing of ammonia concentration, downward trend with the increasing of CO2 inlet concentration, and first increased and then decreased with the increasing of gas flow rate. The mass transfer enhancement by Fe3O4 nanoparticles was mainly attributable to coalescence inhibition as well as micro-convection induced by the Brownian motion.

Study of ozone concentration from CO2 decomposition in a water cooled coaxial dielectric barrier discharge

In this paper, study of ozone concentration from dissociation of CO2 at atmospheric pressure by a 6 l/min water-cooled cylindrical dielectric barrier discharge was reported. The discharge was powered by a high voltage generator (20 kV, 300 W, ~20 kHz) at 25% and 50% burst and pure AC modes. All experiments were done in three different CO2 gas flow rates namely 1.5, 2 and 2.5 l/min. Because of cooling rate of ~3 °C/s, dielectric of fused quartz and grounded mesh electrode were kept at room temperature 298±1 K, during micro plasma discharges. Ozone concentration at different flow rates versus electrical power dissipated in the plasma were presented in burst mode and pure AC mode. The highest ozone concentration of 336 ppm was observed for 1.5 l/min of CO2 flow rate at 12.5 kV, 37.2 mA filamentary pure AC mode discharge whilst the lowest ozone production rate of 13.5 ppm was observed for 2.5 l/min of CO2 flow rate at 10.5 kV, 27.2 mA and 25% duty cycle in burst mode discharge. The activated species formed inside the CO2 plasma were identified by optical emission spectroscopy. Effect of water cooling on ozone concentration in a cylindrical micro plasma discharge was studied.

Precipitation Process of CaCO3 from Natural Limestone for Functional Materials.

This article aims to report on the production of precipitated CaCO3, with various morphologies and particle sizes through several methods, namely carbonation methods with CO2 gas bubbling, rapid mixing of the solutions, and carbonation with modified bubbling techniques. The simple bubbling method was performed by flowing CO2 gas into Ca(OH)2 solution until precipitation occurs. This method can produce calcite particles up to 100% at the intermediate temperatures. In the modified bubbling technique, the gas flow was interrupted by a breaker and porous material with variation of stirring speeds. Through this technique, it produces 99% aragonite particles at higher temperatures. Additionally, 95% spherically vaterite particles with porous structures can also be produced by the rapid mixing solution method at the low temperatures. Depending on the reaction temperature, pH and concentration of the solution, and CO2 gas flow rate, these methods provide alternative routes for producing precipitated CaCO3 particles from natural limestone extraction with certain morphology and particle size for additional applications.

An Integrated Methodology towards Mitigation of Global Warming and Biomass Production for Biodiesel using Chlorella sorokiniana BTA 9031

The rise of atmospheric carbon dioxide (CO2)concentration as well as depletion of fossil fuel reserves calls for the development of clean and ecofriendly alternative fuel source. Recently, lipid rich microalgal biomass is being extensively studied for generation of biodiesel however, the expensesincurred on production of microalgal biomassis a significant hurdle. Almost 80 % of the production costis generated from the cultivation medium which majorly comprise of carbon, nitrogen and phosphate. If the microalgal cultivation could be linked to a CO2 capturing unit than the cost of production could be reduced to a large extent. CO2 absorption by means of aqueous amine solvents is known to be a mature technology and could be integrated with microalgal cultivation unit for efficient utilization of the captured CO2. In this present research work, blended solution of piperazine (PZ) and2-amino-2-methyl-1-propanol (AMP) (5/25 wt. %) was used to capture CO2 and then the captured CO2 was utilized as an inorganic carbon stream for growing Chlorella sorokiniana BTA 9031 for biodiesel production. The CO2rate absorption was governed by series of process variablesviz.solvent flow rate ranges (1.5 to 3) ×10⁻4 m3 min-1, absorption temperature (298 to 313) K,concentration of CO2 (10 to 15) kPa and gas flow rate(5 to 8) ×10⁻3 m3 min-1. The detected final biomass strengthofChlorella sorokiniana BTA 9031 was0.955g L-1. The fatty acid methyl esters (FAME) determinedsubsequentlyacid transesterification was observed to contain fatty acids suitable for biodiesel production.

In-situ SIFSIX-3-Cu growth into melamine formaldehyde sponge monolith for CO2 efficient capture

CO2 adsorption separation by metal-organic frameworks (MOFs) is an efficient carbon capture and storage method. We proposed a strategy of two-step in-situ MOFs growth in porous carrier to prepare high efficient CO2 adsorbent for low concentration CO2 adsorption. At first, metal ions were introduced into the pores of melamine formaldehyde sponge (MFS) monolith carriers onto which inner walls a thin layer of PVA was adhered in advance, then organic ligands were introduced into the pores of MFS. The thin PVA layer greatly strengthened the anchoring of MOFs in the carriers. The in-situ MOFs growth in MFS effectively avoided crystals stack together, presented a multi-level pore structure in fixed bed, which is beneficial for gas diffusion with rapid adsorption kinetics. The CO2 adsorption was carried out in a fixed bed by conducting breakthrough experiments. The MOFs crystals uniformly grown in pores of MFS. The monolith composite adsorbent prepared at 6% organic ligand, with MOFs loading ratio of 5 g·g−1(carrier), showed good CO2 uptake value of 1.02 mmol·g−1(adsorbent) in the CO2/N2 atmosphere with CO2 concentration of 5000 PPM at 20 °C. By secondary growth, higher MOFs loading ratio and desired morphology crystals were achieved. The effects of CO2 concentration and gas flow rate on adsorption properties of the secondary-growth adsorbent were investigated. The working CO2 capacity was better than that of 13X zeolite. The presence of 21 vol% O2 did not influence the CO2 adsorption. After 10 cycles adsorption-desorption in 15 days, the as-prepared adsorbent still showed a very stable adsorption separation performance.

Enhanced CO2 capture through reaction with steel-making dust in high salinity water

Mineral carbonation (MC) is evolving as a possible technology for sequestering CO2 from medium-sized emission point sources. Industrial wastes have been recently used as an effective source for MC that have higher reactivity than natural minerals; they are also inexpensive and readily available in proximity to CO2 emitters. In this work, accelerated carbonation of electric arc furnace (EAF) baghouse dust (BHD) in a reject brine medium was evaluated in a novel reactor system, specially designed for contacting gases and liquids. This approach is environmentally friendly and eliminates the cost associated with pre-treatment. Experimental design was utilized to determine the effect of the operating parameters (solid to liquid ratio, CO2 gas flowrate and inert particles fraction) on the CO2 uptake. Analysis of the experimental results indicated that the studied factors had a significant impact on CO2 uptake, which was observed to be in the range of 0.1–0.18 gCO2/g BHD. At ambient conditions (24 °C and 1 atm) and at optimum operating parameters, the optimum CO2 uptake was 0.22 g CO2/g BHD. A higher CO2 uptake performance of 1 ± 0.04 gCO2/g BHD was achieved at ambient temperature and pressure of 5 bar. Thermal gravimetric analysis of the solid products revealed that a variety of carbonate products have been produced, particularly, calcium and magnesium carbonates.

Numerical Simulation of Crystalline Silicon Heterojunction Solar Cells with Different p-Type a-SiOx Window Layer

In this study, p-type amorphous silicon oxide (a-SiOx) films are deposited using a radio-frequency inductively-coupled plasma chemical vapor deposition system. Effects of the CO2 gas flow rate on film properties and crystalline silicon heterojunction (HJ) solar cell performance are investigated. The experimental results show that the band gap of the a-SiOx film can reach 2.1 eV at CO2 flow rate of 10 standard cubic centimeters per minute (sccm), but the conductivity of the film deteriorates. In the device simulation, the transparent conducting oxide and contact resistance are not taken into account. The electrodes are assumed to be perfectly conductive and transparent. The simulation result shows that there is a tradeoff between the increase in the band gap and the reduction in conductivity at increasing CO2 flow rate, and the balance occurs at the flow rate of six sccm, corresponding to a band gap of 1.95 eV, an oxygen content of 34%, and a conductivity of 3.3 S/cm. The best simulated conversion efficiency is 25.58%, with an open-circuit voltage of 741 mV, a short-circuit current density of 42.3 mA/cm2, and a fill factor of 0.816%.

CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS

Abstract CO2 biofixation of the microalgae Chlorella sp. for different CO2 concentrations and gas flow rates in a bubble column reactor has been investigated in this study. Microalgae were cultivated under different CO2 concentrations (at 1.75% and 9.45% v/v) and gas flow rates (at 30, 50 and 70 ml/min). The maximum specific growth rate of Chlorella sp. was obtained for the CO2 concentration of 1.75 % and the gas flow rate of 50 mL/min. The highest biomass productivity rate (at 0.17 g L-1 day-1) was for a sample with 1.75 % CO2 at a flow rate of 70 ml/min. Moreover, the results have shown that the specific growth rate and CO2 biofixation have a direct relation with culturing of Chlorella sp. Also, limiting CO2 supplementation noticeably decreased biomass concentration. Therefore, the results have shown that a high flow rate and low concentration of CO2 might promote a decrease in CO2 fixation efficiency by Chlorella sp.

Optimum Design of Reactive Sputtering Parameters on the Mechanical Property of C-Doped TiO<sub>2</sub> Photocatalytic Films: CO<sub>2</sub> as Carbon Source

In this research, CO2 gas was used as carbon and oxygen source to prepare carbon-doped TiO2 (C-TiO2) films on stainless steel by reactive magnetron sputtering. In order to grasp the relationship between sputtering process, microstructure and mechanical and photocatalysis properties of C-TiO2 thin film, a orthogonal experiment design validated by following mechanical analysis and photo-degradation experiments was employed to determine the optimal reactive sputtering parameters, including substrate temperature, sputtering power and CO2 gas flow rate. nanoindentation and nanoscratch tests were employed to analyze the hardness, modules and adhesion strength of as-deposited C-TiO2 films, respectively. Taking the hardness, modules and adhesion between the film and the substrate as a reference of integrated mechanical properties, range analysis of as-prepared C:Ti-O films were done to search the optimal combination of sputtering parameters. The photocatalytic activities of as-prepared C-TiO2 films using methyl orange (MO) as colored dye indicator were also evaluated by measuring absorbance and calculating the MO’s decolorization rate under different UV light irradiation time. The results of photocatalysis experiment compared with a blank group proved that C-TiO2 films sputtered at the optimized reactive sputtering parameters can achieve both superior photocatalysis and mechanical properties.

Enhanced CO2 sorption capacity of amine-tethered fly ash residues derived from co-firing of coal and biomass blends

Co-firing of coal and biomass blends provides a promising route for clean energy utilization with high efficiency and mitigated pollutants emission. However, the technology meets an important challenge in effective utilization of the co-firing fly ashes. Efforts have been made to valorize the co-firing fly ash residues as potential CO2 sorbents. To achieve enhanced CO2 sorption performance, the samples were modified with tetraethylenepentamine (TEPA). Effects of amine loading, CO2 sorption temperature, initial CO2 concentration and gas flow rate on CO2 sorption behaviors of the amine-tethered sorbents were investigated. The desired sorbent with 25% TEPA loading presented the highest CO2 sorption capacity of 1.19 mmol CO2/g when tested under 60 °C and 15%CO2 with a total gas flow rate of 1200 ml min−1. The effects of regeneration temperature and ramping rate on sorbent regeneration performance were demonstrated. The maximum sorbent regeneration efficiency of 97.2% was achieved under the regeneration condition of 110 °C and 5 °C min−1. CO2 sorption capacity of the amine-tethered sorbent kept stable within 5 repeated cycles. These findings indicate that the amine-tethered sorbent could be a good candidate for on-site CO2 capture from flue gas in co-firing power plants.

Carbon Electrodes from Corn Stalk Core for Supercapacitor Application

The natural pore structure of corn stalk core potentially contributes as a basic material for activated carbon. The activated carbon from a combination of chemical and physical activation is presented for capacitive energy storage. The chemical activation was carried out using 0.4 M KOH followed by pyrolysis process up to 600°C in an N2 atmosphere. The physical activation was conducted at various temperatures such as 600°C, 700°C, and 800°C with a CO2 gas flow rate of 10 mL/min. Supercapacitor cells were made from carbon electrodes of corn stalk core, 316L stainless steel as the current collector, duck eggshell as the separator, and 1 M H2SO4 as the electrolyte solution. The physical properties of carbon electrodes were characterized by identifying the density, surface morphology and chemical structure of carbon. The density value was obtained based on the mass, thickness, and diameter of the carbon electrode. The lowest density was found at the activation temperature of 700°C which has the potential to produce the best performance in supercapacitor cells. SEM was used to characterize the surface morphology. The activation temperature of 700°C showed the formation of irregular structures and provided large pores for the diffusion of electrolyte ions into the carbon matrix. The FTIR characterization was used to determine the carbon chain elements which formed double layers in supercapacitor cells. The electrochemical properties of supercapacitor cells were tested using cyclic voltammetry. Specific capacitances at the activation temperature of 600°C, 700°C, and 800°C were 90 Fg-1, 108.92 Fg-1, and 44.875 Fg-1, respectively. These results showed that the activation temperature of 700°C was the best temperature in the preparation of supercapacitor electrodes from corn stalk core as the biomass material.

Kinetic study on CO2 adsorption behaviors of amine-modified co-firing fly ash

Abstract Coal and biomass fly ash was impregnated with tetraethylenepentamine (TEPA) to prepare solid CO2 sorbent. Experimental CO2 adsorption capacities of the sorbent in fixed-bed column were fitted to several kinetic equations. The modified Avrami fractional kinetic model could accurately predict the CO2 adsorption kinetic behaviors of the sorbent under different conditions. CO2 adsorption rate increases with the increase in temperature, initial CO2 concentration and gas flow rate, as a result of the decreased CO2 diffusion resistance. A mathematical model was proposed and demonstrated to well predict the CO2 adsorption breakthrough curves in the fixed-bed column. Effects of temperature, initial CO2 concentration and gas flow rate on the mass transfer kinetic behaviors of the desired sorbent were investigated. The positive effect of these factors on promoting the overall mass transfer coefficient and the internal mass transfer coefficient is not significant. The external mass transfer coefficient will be remarkably reinforced with the increase in these operating parameters, due to the change in viscosity and density of the gas phase and the reduced external mass transfer resistance. Internal mass transfer process is determined as the rate-limiting step for CO2 adsorption. The results will lay the groundwork for future scale-up application of the sorbent in post-combustion CO2 capture.