CO₂ Capture in Chemically and Thermally Modified Activated Carbons Using Breakthrough Measurements: Experimental and Modeling Study

Abstract

The development of adsorption-based technologies for CO 2 capture in the postcombustion processes requires finding materials with high capacity of adsorption and low cost of preparation. In this study, the modification of a commercial activated carbon (Norit ROX 0.8), considered as a solid adsorbent for CO 2 capture, and the effects of different methods of activations, chemically (hydrogen peroxide, sulfuric acid, nitric acid, and urea) and thermally (at 800°C) on adsorption performance, have been investigated. Then, CO 2 adsorption capacity was studied at different temperatures and pressures to evaluate the effects of various agents on sample performance. The textural properties of the samples were determined using adsorption−desorption isotherms of nitrogen at −196°C. Finally, the obtained data were modeled by Response Surface Methodology (RSM) and Langmuir isotherm. The results showed that the prepared sample by successive treatments with nitric acid, urea, and thermal calcination has a higher uptake capacity than other modified samples.

Novel Insights into Activated Carbon Derived from Municipal Solid Waste for CO2 Uptake: Synthesis, Adsorption Isotherms and Scale-up

“…In the last step, desorption process was performed by passing pure helium through the fixed bed. More details about the unit can be found elsewhere [4,10].…”

“…This ecological problem has been originated from anthropogenic activities which undoubtedly, fossil fuel industries and coal fired power plants have a main rule on GHGs emission [2,3]. In this way, carbon capture and sequestration (CCS) strategy, as a combination of several technologies, has emerged which is a promising policy for reduction of CO 2 emission [4]. To this end, CO 2 trapping occurs in three different steps including pre-combustion, post-combustion and oxy-fuel combustion [5].…”

“…Currently, various classes of adsorbents including carbons based materials [4,7,8], zeolite molecular sieves [9,10], metal organic frameworks [11,12], meso-porous silicons [13,14] and other ones [15,16] have been extensively investigated for separation processes, energy conversion, and catalysis. Among different developed materials, activated carbons (ACs) are highly favorable adsorbents for CO 2 adsorption for several reasons [17].…”

Analyses of Adsorption Behavior of CO2, CH4, and N2 on Different Types of BETA Zeolites

“…While carbon dioxide (CO 2 ) has a stronger effect than other gases on energy fields to implement successful separation and purification technologies, it is also one of the main causes of climate change. So, carbon capture and storage (CCS) is a vital step in different processes including natural gas sweetening, biogas upgrading, landfill gas purification, and also post-combustion processes [2][3][4][5].…”

“…On the other hand, while natural gas is one of the favorable energy sources in the world, the applications of this energy source has still some problems because of the presence of several impurities such as nitrogen and CO 2 [5,9]. Beside of its toxic effects, CO 2 corrodes the transportation and storage systems in the presence of water.…”