Adsorbent from Rice Husk for CO₂ Capture: Synthesis, Characterization, and Optimization of Parameters

Abstract

In the present work, adsorbents were prepared from rice husk in order to capture CO2 from a flue gas stream. Various pretreatment processes such as desilicalization, chemical activation, and K2CO3 impregnation were followed to prepare the adsorbents. The physico-chemical characterization of the adsorbents was performed in detail in an elaborated way. A fixed-bed reactor was used to measure the CO2 capture capacity of the in-house developed adsorbents. The effect of various process parameters such as adsorption temperature, moisture content, and loading of active component on CO2 adsorption capacity was studied, and results were compared with a commercially available activated carbon. The maximum adsorption capacity observed for 20K-ARH adsorbent was as high as 67 g of CO2/kg sorbent. The effect of water on CO2 adsorption was critically examined, and formation of KHCO3 was observed in the presence of water during the adsorption process. The optimum operating conditions for the maximum removal of CO2 from a simulated flue gas include a temperature range of 30–40 °C, relative humidity range of 80–90%, and K2CO3 loading of about 20 wt %. It was observed that around 94% of the adsorbed CO2 can be desorbed at 180 °C, and the adsorbent can be reused for multiple cycles without compromising the capture capacity significantly.

RETRACTED: Experimental investigations of CO2 capture using adsorbents in a standby power generation unit

“…The adsorbent's moisture concentration plays a vital role in CO 2 capture application in adsorption (Choi et al 2009;Murge et al 2018). In this study, the water droplets are added to the adsorbent samples to enhance their moisture on the surface.…”

Zeolite-Based Sorbent for CO2 Capture: Preparation and Performance Evaluation

“…The stored data were used to estimate the adsorption capacity of a particular adsorbent. The experimental procedure is explained in detail in our previous article . While most of the experiments were performed under atmospheric pressure, few experiments were performed at elevated pressure in the range of 2–5 bar to explore the effect of pressure on CO 2 capture capacity.…”

Controlling C–C coupling in electrocatalytic reduction of CO2 over Cu1−xZnx/C

“…In the backdrop of energy crisis across the world and global warming due to the accumulation of anthropogenic CO 2 , electrocatalytic reduction of CO 2 powered by renewable electrical energy sources to value-added chemicals and fuels offers a promising solution for sustainable feedstocks in the chemical industry. [1][2][3][4][5][6][7][8] However, due to the high chemical and thermodynamic stability of CO 2 , selective electroreduction with high faradaic efficiency at lower potentials remains extremely challenging. [9][10][11][12][13][14][15][16][17] Hence, catalytic materials play a significant role in activating gaseous CO 2 and facilitating the reduction kinetics.…”