Solid sorbents based on graphite electrode waste and cerium oxide (ceria, CeO2) have been studied with regard to CO2 capture. The acid-base properties of cerium oxide produce a sorbent for the capture of CO2. The aim of the study is to evaluate the performance of CO2 capture using graphite/CeO2 composites at different weights of Ce(NO3)3.6H2O (0.5, 1 and 2 g), namely G0.5, G1 and G2, respectively. Volumetric adsorption studies of CO2 on graphite/CeO2 composites and ceria were conducted at various pressures (P) of 3, 5, 8, 15 and 20 bar, and temperatures (T) of 303, 308, 318 K. Graphite waste before modification (GBM), activated graphite waste (GA), and CeO2 for capturing CO2 were also investigated. By varying the two parameters (P and T), we found that the maximum adsorption capacities of CO2 at 303 K and 20 bar were 0.0713, 0.0316, 0.1574, 0.0987, 0.1137, and 0.0964 kg/kg respectively, for GBM, GA, G0.5, G1, G2 and CeO2. The highest adsorption capacity of CO2 was found in the G0.5 composite. The adsorption performance of CO2 using ceria was almost similar to the G1 composite. We found that CO2 adsorption capacity decreases with an increasing temperature from 303 to 318 K. It was concluded that ceria and composite graphite waste/CeO2 are stable and selective CO2 sorbents. The work allows us to synthesize a new sorbent which can be effectively applied for CO2 capture. The adsorption capacity of CO2 depends significantly on the active site and chemical modifier of the sorbents.
Abstract. In this research, the effect of physical and chemical modifications of low-grade bauxite (LB) with particle size of 200 mesh were studied. Here, we demonstrate chemically technique to synthesize low-grade bauxite/CeO 2 composites using Ce(NO 3 ) 3 .6H 2 O with weight variations of 0.5, 1 and 2 g. The effect of Ce(NO 3 ) 3 .6H 2 O concentrations on BET surface area of prepared low-grade bauxite/CeO 2(0.5) (ALB0.5), low-grade bauxite/CeO 2(1) (ALB1), and lowgrade bauxite/CeO 2(2) (ALB2) composites were observed. The results showed the BET surface area of LB is 59.85 m²/g. After acid activation with 1M HNO 3 , activated low-grade bauxite (ALB) has BET surface area of 101.6 m²/g. By chemically modification with Ce(NO 3 ) 3 .6H 2 O in concentration ranging from 0.5; 1 and 2 g, the BET surface areas were reduced in the respectively order of 94.5, 87.9, and 85.5 m²/g for ALB0.5, ALB1, and ALB2. With the increase of the Ce(NO 3 ) 3 .6H 2 O concentration, the BET surface area reduced compare to those found in the ALB. The acid activation treatment has significant effect compare to the chemical modification using Ce(NO 3 ) 3 .6H 2 O.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.