Low Temperature Catalytic Adsorption of SO₂ on Activated Carbon

Abstract

Catalytic adsorption of SO 2 on activated carbon materials provides an appropriate alternative for the control of low concentration emissions of this air pollutant. The surface complexes formed upon SO 2 adsorption at 30 °C were studied by X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The effect of the addition of O 2 and the presence of copper as catalyst were studied. Copper assisted the oxygen transfer to the carbon matrix. For the Cu-impregnated carbon sample, the presence of O 2 favored SO 2 adsorption by increasing the breakthrough time, the adsorption capacity and the formation of sulfur and oxygen complexes of higher thermal stabilities, which mainly desorb as SO 2 and CO 2 .

Proton exchange membrane fuel cell contamination model: Competitive adsorption followed by a surface segregated electrochemical reaction leading to an irreversibly adsorbed product

“…For instance, the contaminant concentration is affected by the scavenging effect of liquid water, adsorption/reaction on carbon within the cell [19,20] and the presence of sulfur on the catalyst carbon support [21]. Therefore, even if a fraction of these effects are reduced by treating the catalyst carbon support or carbon gas diffusion layer to remove the sulfur [22][23][24], the contaminant concentration at the catalyst surface represents an effective value which is smaller than the contaminant concentration in the inlet stream.…”

“…Eqs. (20) and (21), the initial i value and slope and steady state i value yield 1 , k /k and k X,des estimates:…”

Physicochemical properties of metal-doped activated carbons and relationship with their performance in the removal of SO2 and NO

“…As for SO 2 removal, Lopez proposed that copper oxides had a catalytic effect toward the transformation of SO 2 into other species [17]. Liu revealed that Fe 2 O 3 reacted with SO 2 resulting in the formation of H 2 SO 4 and Fe 2 (SO 4 ) 3 [7].…”

Study on coadsorption of SO2, NO, and CO2 over copper‐supported activated carbon sorbent in different operating conditions

“…In this study, the adsorption temperature ranged from 50 to 90 C. Cu-SAC-9.8 was selected to investigate under the conditions of 2000 ppm SO 2 , 1000 ppm NO, 10% CO 2 , 5% O 2 , and balance N 2 with a total gas flow rate of 400 mL/min. (3) Gas molecules reduced kinetic energies at higher temperature which made adsorption exothermic [17]. As shown in Figure 3a, the 100% removal efficiency of SO 2 was 40, 36, and 32 min at 50, 70, and 90 C, respectively.…”

“…It was reported that added oxygen benefited the adsorption of SO 2 [17,18] and NO [19] on activated carbon materials. Therefore, the effect of oxygen on coadsorption of SO 2 , NO, and CO 2 over Cu-SAC-9.8 was studied under the following condition: adsorption temperature of 50 C and feed gas containing 2000 ppm SO 2 , 1000 ppm NO, 10% CO 2 , 0-5%O 2 , and N 2 as the carrier gas with total gas flow rate of 400 mL/ min.…”