Removing carbonyl sulfide with metal-modified activated carbon

doi:10.1007/s11783-014-0714-5

Front. Environ. Sci. Eng.

2016, Vol. 10

Issue (1) : 11-18 https://doi.org/10.1007/s11783-014-0714-5

RESEARCH ARTICLE

Removing carbonyl sulfide with metal-modified activated carbon

Juan QIU,Ping NING(

),Xueqian WANG(

),Kai LI,Wei LIU,Wei CHEN,Langlang WANG

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

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Abstract

A Cu-Co-K/activated carbon (AC) adsorbent has been developed for the removal of carbonyl sulfide (COS). The effects of COS concentration, reaction temperature and relative humidity were closely examined. A breakthrough of 33.23 mg COS·g⁻¹ adsorbent at 60°C, under 30% relative humidity and in presence of 1.0% oxygen was exhibited in the Cu-Co-K/AC adsorbent prepared. Competitive adsorption studies for COS in the presence of CS₂, and H₂S were also conducted. TPD analysis was used to identify sulfur-containing products on the carbon surface, and the results indicated that H₂S, COS and SO₂ were all evident in the effluent gas generated from the exhausted Cu-Co-K/AC. Structure of the activated carbon samples has been characterized using nitrogen adsorption, and their surface chemical structures were also determined with X-ray photoelectron spectroscopy (XPS). It turns out that the modification with Cu(OH)₂CO₃-CoPcS-KOH can significantly improve the COS removal capacity, forming SO42− species simultaneously. Regeneration of the spent activated carbon sorbents by thermal desorption has also been explored.

Keywords carbonyl sulfide activated carbon removal reactive adsorption

Corresponding Author(s): Ping NING,Xueqian WANG

Online First Date: 30 May 2014 Issue Date: 03 December 2015

Cite this article:

Juan QIU,Ping NING,Xueqian WANG, et al. Removing carbonyl sulfide with metal-modified activated carbon[J]. Front. Environ. Sci. Eng., 2016, 10(1): 11-18.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0714-5
https://academic.hep.com.cn/fese/EN/Y2016/V10/I1/11

Fig.1 Effects of COS concentration on COS removal (Reaction Condition: 3.5 g sample, 1.0% O₂, 60°C, 30% RH, flow rate 360 mL·min⁻¹)

Fig.2 Effects of reaction temperature on COS removal (Reaction Condition: 3.5g sample, COS inlet concentration 754 ppm,1.0% O₂, 30% RH, flow rate 360 mL·min⁻¹)

Fig.3 Effects of relative humidity on COS removal (Reaction Condition: 3.5 g sample, COS inlet concentration 754 ppm, 1.0% O₂, 60 °C, flow rate 360 mL·min⁻¹)

Tab.1 COS and CS₂ breakthrough adsorption capacities, at 60°C under 30% RH

Tab.2 COS and H₂S breakthrough adsorption capacities, at 60 °C under30% RH

Fig.4 Effect of CS₂ competitive adsorption on COS removal

Fig.5 Effect of H₂S competitive adsorption on COS removal

Fig.6 TPD profiles from the analyses of the N2 sweep gas at the exit of the test apparatus during the thermal desorption of COS adsorbed Cu-Co-K/AC

Tab.3 Porosity parameters for activated carbon samples

Fig.7 Comparison of the pore size distributions of Cu(OH)₂CO₃-CoPcS-KOH modified samples before and after the COS adsorption

Fig.8 Detail S 2p XPS spectral of exhausted Cu-Co-K/AC samples

Fig.9 Breakthrough curves of fresh and regenerated Cu-Co-K/AC sorbent samples. Regenerated samples are referred to as Cu-Co-K/AC-R#, where # indicates the number of times the sample has been regenerated

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