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Recent Innovations in Chemical Engineering


ISSN (Print): 2405-5204
ISSN (Online): 2405-5212

Research Article

Preparation and Characterization of Cu(NO3)2 Modified Activated Carbon Adsorbents and Influencing Factors of H2S Adsorption

Author(s): Jiaojing Zhang*, Mei Zhang, Yanxiu Liu, Xueqin Wang and Yuanyuan Wang

Volume 16, Issue 2, 2023

Published on: 07 April, 2023

Page: [88 - 98] Pages: 11

DOI: 10.2174/2405520416666230308153305

Price: $65


Background: With the constant development and growth of the world’s economy, the demand for energy continues to rise. However, rising oil prices, increasing carbon emissions, and energy shortages will limit economic development and affect living standards. Therefore, further exploitation and utilization of natural gas are of great significance for the sustainable development of national economies and the improvement of civil life.

Objective: Natural gas contains acidic gas, such as hydrogen sulfide (H2S), and can lead to physical safety issues, environmental pollution, equipment corrosion, and catalyst poisoning. Therefore, a desulfurization process, which has practical significance, must be carried out to reduce the H2S content to less than 20 mg•m−3.

Methods: Currently, the main desulfurization processes involve dry and wet desulfurization methods. The wet desulfurization methods include physical, chemical, and physico-chemical solvent methods, which have a large processing capacity and involve a continuous operation sequence applied to the purification of natural gas containing a high sulfur content. The dry desulfurization methods, which use a solid as the desulfurizer, have high precision, easy operation, and low energy consumption. This method has been widely applied to advanced treatment.

Activated carbon, which has a large surface area, large pore volume, and complex porous structure, is widely used as an adsorbent for desulfurization. When compared with other adsorbents, activated carbon has several advantages, such as a high adsorption capacity and low cost. The H2S removal performance of the adsorbent can be significantly improved after modification. In this study, using a low concentration of H2S and nitrogen to simulate raw fuel gas, cupric nitrate-modified activated carbon was used as the main adsorbent for desulfurization. The effect of the preparation conditions on the H2S removal performance was studied, and the adsorbents were characterized using a series of methods.

Results: In this study, a low concentration of H2S and nitrogen were used to simulate raw fuel gas, and cupric nitrate-modified activated carbon was used as an adsorbent. The results from structural analysis indicated a significant change in the surface structure of AC by introducing Cu(NO3)2. Cu(NO3)2 promoted the transformation of micropores into mesopores or macropores and active substances into the pores of AC for desulfurization. The effects of the preparation conditions on the H2S removal performance were studied using a fixed-bed adsorption column. The best preparation conditions for the Cu(NO3)2 modified activated carbon adsorbent involved: a Cu(NO3)2 impregnation concentration of 5%, impregnation time of 24 h, calcination temperature of 300 °C, and calcination time of 2 h. The H2S saturation capacity and desulfurization rate reached 55.4 mg·g−1 and 98.92%, respectively. The H2S saturation capacity was improved by 38.2 mg·g−1 compared with unmodified activated carbon.

Conclusion: In this study, a low concentration of H2S and nitrogen were used to simulate raw fuel gas, and cupric nitrate-modified activated carbon was used as an adsorbent. The experimental results showed that the H2S removal performance of the adsorbent was significantly improved using Cu(NO3)2 impregnated activated carbon.

Keywords: Natural gas, raw fuel gas, H2S, adsorption, desulfurization, modified, cupric nitrate.

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Zheng X, Zhang G, Yao Z, et al. Engineering of crystal phase over porous MnO2 with 3D morphology for highly efficient elimination of H2S. J Hazard Mater 2021; 411: 125180-93.
[] [PMID: 33858115]
Li Y, Yang C, Fan H, et al. Enhanced sulfur selectivity for H2S catalytic oxidation over Fe2O3@UiO-66 catalyst. Separ Purif Tech 2022; 289: 120791-8.
Wang L, Cao B, Wang S, Yuan Q. H2S catalytic oxidation on impregnated activated carbon: Experiment and modelling. Chem Eng J 2006; 118(3): 133-9.
Bagreev A, Bandosz TJ. H2S adsorption/oxidation on unmodified activated carbons: Importance of prehumidification. Carbon 2001; 39(15): 2303-11.
Kazmierczak-Razna J, Gralak-Podemska B, Nowicki P, Pietrzak R. The use of microwave radiation for obtaining activated carbons from sawdust and their potential application in removal of NO2 and H2S. Chem Eng J 2015; 269: 352-8.
Restivo J, Soares OSGP, Órfão JJM, Pereira MFR. Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water. Catal Today 2015; 249: 213-9.
Ma J, Li L, Ren J, Li R. CO adsorption on activated carbon-supported Cu-based adsorbent prepared by a facile route. Separ Purif Tech 2010; 76(1): 89-93.
Bhatnagar A, Hogland W, Marques M, Sillanpää M. An overview of the modification methods of activated carbon for its water treatment applications. Chem Eng J 2013; 219: 499-511.
Ge X, Tian F, Wu Z, Yan Y, Cravotto G, Wu Z. Adsorption of naphthalene from aqueous solution on coal-based activated carbon modified by microwave induction: Microwave power effects. Chem Eng Process 2015; 91: 67-77.
Sitthikhankaew R, Chadwick D, Assabumrungrat S, Laosiripojana N. Effects of humidity, O2, and CO2 on H2S adsorption onto upgraded and KOH impregnated activated carbons. Fuel Process Technol 2014; 124: 249-57.
Khalil AME, Eljamal O, Amen TWM, Sugihara Y, Matsunaga N. Optimized nano-scale zero-valent iron supported on treated activated carbon for enhanced nitrate and phosphate removal from water. Chem Eng J 2017; 309: 349-65.
ben Mosbah M, Mechi L, Khiari R, Moussaoui Y. Current state of porous carbon for wastewater treatment. Processes 2020; 8(12): 1651-79.
Wang P, Xu J, Xu F, et al. Constructing hierarchical porous carbon via tin punching for efficient electrochemical energy storage. Carbon 2018; 134: 391-7.
Guo Y, Tan C, Sun J, Li W, Zhang J, Zhao C. Porous activated carbons derived from waste sugarcane bagasse for CO2 adsorption. Chem Eng J 2020; 381: 122736-44.
Elhleli H, Mannai F. ben Mosbah M, Khiari R, Moussaoui Y. Biocarbon derived from opuntia ficus indica for p-nitrophenol retention. Processes 2020; 8(10): 1242-56.
Dhahri R. Yılmaz M, Mechi L, et al. Optimization of the preparation of activated carbon from prickly pear seed cake for the removal of lead and cadmium ions from aqueous solution. Sustainability 2022; 14(6): 3245-61.
Bu J, Loh G, Gwie CG, Dewiyanti S, Tasrif M, Borgna A. Desulfurization of diesel fuels by selective adsorption on activated carbons: Competitive adsorption of polycyclic aromatic sulfur heterocycles and polycyclic aromatic hydrocarbons. Chem Eng J 2011; 166(1): 207-17.
Chaichanawong J, Yamamoto T, Ohmori T, Endo A. Adsorptive desulfurization of bioethanol using activated carbon loaded with zinc oxide. Chem Eng J 2010; 165(1): 218-24.
Khadhri N, El Khames Saad M. ben Mosbah M, Moussaoui Y. Batch and continuous column adsorption of indigo carmine onto activated carbon derived from date palm petiole. J Environ Chem Eng 2019; 7(1): 102775-96.
Wang Z, Huang J, Zhong Y, et al. Copper supported on activated carbon from hydrochar of pomelo peel for efficient H2S removal at room temperature: Role of copper valance, humidity and oxygen. Fuel 2022; 319: 123774-86.
Khan NA, Hasan Z, Min KS, Paek S-M, Jhung SH. Facile introduction of Cu+ on activated carbon at ambient conditions and adsorption of benzothiophene over Cu+/activated carbon. Fuel Process Technol 2013; 116: 265-70.
Chen S, Guo Y, Zhang J, Guo Y, Liang X. CuFe2O4/activated carbon adsorbents enhance H2S adsorption and catalytic oxidation from humidified air at room temperature. Chem Eng J 2022; 431: 134097-112.
Zhang J, Wang G, Wang W, Song H, Wang L. Preparation of manganese dioxide loaded activated carbon adsorbents and their desulfurization performance. Russ J Phys Chem A Focus Chem 2016; 90(13): 2633-41.
Wang Y, Zhou M, He Y, Zhou Z, Sun Z. In situ loading CuO quantum dots on TiO2 nanosheets as cocatalyst for improved photocatalytic water splitting. J Alloys Compd 2020; 813: 152184-90.
Mishra RK, Kumar VB, Victor A, Pulidindi IN, Gedanken A. Selective production of furfural from the dehydration of xylose using Zn doped CuO catalyst. Ultrason Sonochem 2019; 56: 55-62.
[] [PMID: 31101289]
Bashkova S, Baker FS, Wu X, Armstrong TR, Schwartz V. Activated carbon catalyst for selective oxidation of hydrogen sulphide: On the influence of pore structure, surface characteristics, and catalytically-active nitrogen. Carbon 2007; 45(6): 1354-63.
Yu H, Zi F, Hu X, et al. Adsorption of the gold–thiosulfate complex ion onto cupric ferrocyanide (CuFC)-impregnated activated carbon in aqueous solutions. Hydrometallurgy 2015; 154: 111-7.
Bagreev A, Katikaneni S, Parab S, Bandosz TJ. Desulfurization of digester gas: Prediction of activated carbon bed performance at low concentrations of hydrogen sulfide. Catal Today 2005; 99(3-4): 329-37.
He P, Gao Y, Lian J, et al. Surface modification and ultrasonication effect on the mechanical properties of carbon nanofiber/polycarbonate composites. Compos, Part A Appl Sci Manuf 2006; 37(9): 1270-5.

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