1
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Katz S, Pevzner A, Amitay-Rosen T, Marx S, Rotter H, Ben-Shahar Y, Aviram L, Lybman A, Shepelev V, Nir I. Vibrational spectroscopy characterization of impregnated activated carbon adsorption of H 2S. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2024:1-12. [PMID: 38913988 DOI: 10.1080/15459624.2024.2357103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Activated carbon filters are used for the removal of hazardous gases from the air. This research applied vibrational spectroscopy methods, including Fourier-transform infrared spectroscopy and Raman spectroscopy to characterize hydrogen sulfide adsorption on impregnated carbon materials with metals having reactivity toward hydrogen sulfide. The Fourier-transform infrared spectroscopy results demonstrated the formation of a new chemical bond between the impregnating metals and the sulfur, indicated by the appearance of a new band at 618 cm-1. The Raman spectra results showed that for the copper-impregnated activated carbon with the highest hydrogen sulfide adsorption capacity, a new vibrational band at 475 cm-1 evolved, indicating a copper-sulfur bond. In addition, upshifts in the carbon D sub-bands were observed after efficient hydrogen sulfide adsorption, along with a larger area of the approximately 1500 cm-1 band. Therefore, Fourier-transform infrared spectroscopy and Raman spectroscopy combination can potentially indicate H2S adsorption on impregnated activated carbon filters.
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Affiliation(s)
- Sari Katz
- On Sabbatical leave from the Space Environment Department, Soreq NRC, Yavne, Israel
| | - Alexander Pevzner
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Tal Amitay-Rosen
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Sharon Marx
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Hadar Rotter
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Yuval Ben-Shahar
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Liat Aviram
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | - Amir Lybman
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
| | | | - Ido Nir
- Department of Physical Chemistry, Israel Institute for Biological Research, Ness-Ziona, Israel
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2
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Yang C, Liu Z, Su Z, Wang Y, Feng Y, Luo J, Liang M, Fan H, Bandosz TJ. Regulating the spatial arrangement of CuO and MgO within activated carbon matrix to maximize their room temperature H 2S removal. J Colloid Interface Sci 2024; 661:897-907. [PMID: 38330662 DOI: 10.1016/j.jcis.2024.01.216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 01/27/2024] [Accepted: 01/31/2024] [Indexed: 02/10/2024]
Abstract
Adsorbents with dual-component active phases have attracted much attention owing to their potential application in synergistic H2S removal. The influence of spatial arrangements of two components within a support matrix on their desulfurization performance was investigated through regulating the mutual arrangements of CuO and MgO on an activated carbon surface. Their spatial locations were found to remarkably affect interfacial interactions, local pH, the conductivity of adsorbents, and electronic structure of copper oxide. A close contact of CuO with the carbon surface led to strong interactions of both components, inhibiting the reduction of CuO and decreasing its reactivity with H2S. On the other hand, a proximity of MgO to the carbon surface increased local pH, promoting the oxidation of H2S into elemental S, instead of sulfates. Cu+ in the copper oxide phase increased the desulfurization performance due to its ability to activate oxygen and to accelerate a lattice diffusion. Enhanced surface conductivity due to the interfacial interactions improved the desulfurization efficiency and favored the formation of elemental S through promoting an electron transfer in redox reactions.
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Affiliation(s)
- Chao Yang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Shanxi Academy of Eco-Environmental Planning and Technology, Taiyuan 030024, Shanxi, China; Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Taiyuan 030024, PR China.
| | - Zhilong Liu
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Zhelin Su
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Yeshuang Wang
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Yu Feng
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Jinhong Luo
- Shanxi Academy of Eco-Environmental Planning and Technology, Taiyuan 030024, Shanxi, China
| | - Meisheng Liang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Huiling Fan
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Teresa J Bandosz
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, NY 10031, United States.
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3
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Xie Y, Peng X, Song X, Ning P, Sun X, Ma Y, Wang C, Li K. Structural/surface characterization of transition metal element-doped H-ZSM-5 adsorbent for CH 3SH removal: identification of active adsorption sites and deactivation mechanism. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:24398-24411. [PMID: 38441737 DOI: 10.1007/s11356-024-32518-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 02/14/2024] [Indexed: 04/07/2024]
Abstract
CH3SH is a potential hazard to both chemical production and human health, so controlling its emissions is an urgent priority. In this work, a series of transition metal-loaded H-ZSM-5 adsorbents (Si/Al = 25) (Cu, Fe, Co, Ni, Mn, and Zn) were synthesized through the wet impregnation method and tested for CH3SH physicochemical adsorption at 60 °C. It was shown that the Cu-modified H-ZSM-5 adsorbent was much more active for CH3SH removal due to its abundant strong acid sites than other transition metal-modified H-ZSM-5 adsorbents. The detailed physicochemical properties of various modified H-ZSM-5 adsorbents were characterized by SEM, XRD, N2 physisorption, XPS, H2-TPR, and NH3-TPD. The effects of metal loading mass ratio, calcination temperature, and acid or alkali modification on the performance of the adsorbent were also investigated, and finally 20% Cu/ZSM-5 was found to have the best adsorption capacity after calcined at 350 °C. Additionally, the Cu/ZSM-5 adsorbent modified by sodium bicarbonate could expose more active components, which improved the adsorbent's stability. However, the consumption and reduction of the active component Cu2+ and the accumulation of sulfate during the adsorption process are the main reasons for the deactivation of the adsorbent. In addition, the simultaneous purging of N2 + O2 can effectively restore the adsorption capacity of the deactivated adsorbent and can be used as a potential strategy to regenerate the adsorbent.
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Affiliation(s)
- Yuxuan Xie
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
| | - Xiao Peng
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
- Faculty of Chemistry and Chemical Engineering, Zhaotong College, Zhaotong, 657000, People's Republic of China
| | - Xin Song
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
- National-Regional Engineering Center for Recovery of Waste Gases From Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
- National-Regional Engineering Center for Recovery of Waste Gases From Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
| | - Xin Sun
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
| | - Yixing Ma
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
- National-Regional Engineering Center for Recovery of Waste Gases From Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
| | - Chi Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China.
| | - Kai Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
- National-Regional Engineering Center for Recovery of Waste Gases From Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming, 650500, People's Republic of China
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4
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Gao J, Li W, Lin Z, Ma J, Yue Y, Zhang J. Adsorption of hydrogen sulfide by iron-based adsorbent derived from fly ash and iron slag. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:57050-57057. [PMID: 36930313 DOI: 10.1007/s11356-023-26419-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
In this article, an innovative sorbent (Fe-FA) is prepared from fly ash; ferrous sulfate-containing waste slag (FSS), which are industrial wastes; and NaOH by a hydrothermal method at 100 °C. As a result, in comparison to several conventional sorbents, such as ZnO, Fe2O3, 13X zeolite, and activated carbon, Fe-FA had the best adsorption performance for H2S adsorption. Fe-FA had not only a higher adsorption capacity (near 150 mg/g) but also a longer breakthrough time (near 400 min) when gas hourly space velocity was 8000 h-1. Then, characterizations of XRD, BET, NH3-TPD, FTIR, and XPS analyzed basic properties of Fe-FA and revealed reasons for the excellent adsorption performance. In general, the excellent adsorption performance of Fe-FA for H2S is mainly due to the high content of iron species (almost 50%) and suitable mesoporous structure in the Fe-FA.
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Affiliation(s)
- Jiaojiao Gao
- The Materials Genome Institute (MGI) of Shanghai University, Shanghai University, Shanghai, 200444, China
| | - Wenying Li
- School of Environment and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Zhou Lin
- School of Environment and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Jianlong Ma
- School of Environment and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Yang Yue
- The Materials Genome Institute (MGI) of Shanghai University, Shanghai University, Shanghai, 200444, China.
| | - Jia Zhang
- School of Environment and Chemical Engineering, Shanghai University, Shanghai, 200444, China
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5
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Wang Y, Luo Z, Luo J, Gao Y, Kong Y, Wang Q. Investigation of the Solubility of Elemental Sulfur (S) in Sulfur-Containing Natural Gas with Machine Learning Methods. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:5059. [PMID: 36981966 PMCID: PMC10049303 DOI: 10.3390/ijerph20065059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/03/2023] [Accepted: 03/12/2023] [Indexed: 06/18/2023]
Abstract
Some natural gases are toxic because they contain hydrogen sulfide (H2S). The solubility pattern of elemental sulfur (S) in toxic natural gas needs to be studied for environmental protection and life safety. Some methods (e.g., experiments) may pose safety risks. Measuring sulfur solubility using a machine learning (ML) method is fast and accurate. Considering the limited experimental data on sulfur solubility, this study used consensus nested cross-validation (cnCV) to obtain more information. The global search capability and learning efficiency of random forest (RF) and weighted least squares support vector machine (WLSSVM) models were enhanced via a whale optimization-genetic algorithm (WOA-GA). Hence, the WOA-GA-RF and WOA-GA-WLSSVM models were developed to accurately predict the solubility of sulfur and reveal its variation pattern. WOA-GA-RF outperformed six other similar models (e.g., RF model) and six other published studies (e.g., the model designed by Roberts et al.). Using the generic positional oligomer importance matrix (gPOIM), this study visualized the contribution of variables affecting sulfur solubility. The results show that temperature, pressure, and H2S content all have positive effects on sulfur solubility. Sulfur solubility significantly increases when the H2S content exceeds 10%, and other conditions (temperature, pressure) remain the same.
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Affiliation(s)
- Yuchen Wang
- School of Management, Xi’an University of Architecture and Technology, Xi’an 710055, China
| | - Zhengshan Luo
- School of Management, Xi’an University of Architecture and Technology, Xi’an 710055, China
| | - Jihao Luo
- School of Computer Science, Beijing Institute of Technology, Beijing 100081, China
| | - Yiqiong Gao
- School of Management, Xi’an University of Architecture and Technology, Xi’an 710055, China
| | - Yulei Kong
- School of Management, Xi’an University of Architecture and Technology, Xi’an 710055, China
| | - Qingqing Wang
- School of Management, Xi’an University of Architecture and Technology, Xi’an 710055, China
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6
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Zulkefli NN, Noor Azam AMI, Masdar MS, Isahak WNRW. Adsorption-Desorption Behavior of Hydrogen Sulfide Capture on a Modified Activated Carbon Surface. MATERIALS (BASEL, SWITZERLAND) 2023; 16:462. [PMID: 36614800 PMCID: PMC9822191 DOI: 10.3390/ma16010462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/04/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
Metal-based adsorbents with varying active phase loadings were synthesized to capture hydrogen sulfide (H2S) from a biogas mimic system. The adsorption-desorption cycles were implemented to ascertain the H2S captured. All prepared adsorbents were evaluated by nitrogen adsorption, Brunauer-Emmett-Teller surface area analysis, scanning electron microscopy-energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. From the results, modified adsorbents, dual chemical mixture (DCM) and a core-shell (CS) had the highest H2S adsorption performance with a range of 0.92-1.80 mg H2S/g. After several cycles of heat/N2 regeneration, the total H2S adsorption capacity of the DCM adsorbent decreased by 62.1%, whereas the CS adsorbent decreased by only 25%. Meanwhile, the proposed behavioral model for H2S adsorption-desorption was validated effectively using various analyses throughout the three cycles of adsorption-desorption samples. Moreover, as in this case, the ZnAc2/ZnO/CAC_OS adsorbents show outstanding performances with 30 cycles of adsorption-desorption compared to only 12 cycles of ZnAc2/ZnO/CAC_DCM. Thus, this research paper will provide fresh insights into adsorption-desorption behavior through the best adsorbents' development and the adsorbents' capability at the highest number of adsorption-desorption cycles.
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Affiliation(s)
- Nurul Noramelya Zulkefli
- Department of Chemical & Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | | | - Mohd Shahbudin Masdar
- Department of Chemical & Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Research Center for Sustainable Process Technology (CESPRO), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Wan Nor Roslam Wan Isahak
- Department of Chemical & Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Research Center for Sustainable Process Technology (CESPRO), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
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7
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POSER M, Rodolfo DUARTE E SILVA L, PEU P, COUVERT A, DUMONT É. Cellular concrete waste: an efficient new way for H2S removal. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.123014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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8
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Alkali-induced metal-based coconut shell biochar for efficient catalytic removal of H2S at a medium-high temperature in blast furnace gas with significantly enhanced S selectivity. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Insight into the effect of gel drying temperature on the structure and desulfurization performance of ZnO/SiO2 adsorbents. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Cepollaro E, Caputo D, Gargiulo N, Deorsola F, Cimino S, Lisi L. H2S catalytic removal at low temperature over Cu- and Mg- activated carbon honeycombs. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.11.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Modelling the hydrate formation condition in consideration of hydrates structure transformation. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Tian X, Chen Y, Chen Y, Chen D, Wang Q, Li X. Removal of Gaseous Hydrogen Sulfide by a FeOCl/H 2O 2 Wet Oxidation System. ACS OMEGA 2022; 7:8163-8173. [PMID: 35284743 PMCID: PMC8908517 DOI: 10.1021/acsomega.2c00267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 02/18/2022] [Indexed: 05/29/2023]
Abstract
The removal of gaseous hydrogen sulfide using FeOCl/H2O2 was studied. The effects of the FeOCl dosage, the H2O2 concentration, the reaction temperature, and the gas flow rate on the removal of H2S were investigated. The reaction products were analyzed, and the characterization of FeOCl was carried out by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy. Furthermore, radical quenching experiments were carried out using butylated hydroxytoluene, isopropanol, and benzoquinone. It was found that the H2S removal rate for a H2S gas concentration of 160 ppm reached 85.6% when bubbling through 100 mL of an aqueous solution containing FeOCl (1 g/L) and H2O2 (0.33 mol/L) at 293 K with a flow rate of 135 mL/min. Although the dissolution of chlorine in FeOCl was found to result in reduced catalytic performance, the activity was restored after soaking the catalyst in concentrated hydrochloric acid (37%) and subsequent calcination. The mechanism of H2S removal was also discussed, and it was found that this process was controlled by H2S diffusion. FeOCl was found to activate H2O2 and produce radicals, such as •OH and •O2 -, resulting in the formation of a water film rich in radicals on the FeOCl surface. Following the diffusion of H2S into the water film, it underwent oxidation by radicals to produce SO4 2-. Overall, the catalyst and the product can be effectively separated.
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Affiliation(s)
- Xiubo Tian
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
| | - Ying Chen
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
- United
National-Local Engineering Laboratory of Harbor Oil & Gas Storage
and Transportation Technology, No. 1, Haida South Road, Dinghai District, Zhoushan 316022, Zhejiang, P. R. China
- Zhejiang
Provincial Key Laboratory of Petrochemical Pollution Control, Dinghai District, Zhoushan 316022, Zhejiang, P.
R. China
| | - Yong Chen
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
| | - Dong Chen
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
| | - Quan Wang
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
| | - Xiaohong Li
- College
of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai
District, Zhoushan 316022, Zhejiang, P. R. China
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13
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Li T, Zhu H, Yu Z, Shi N, Ma Q, Yu J, Ren H, Pan Y, Liu Y, Guo W. Promotion effects of Ni-doping on H2S removal and ZnO initial sulfuration over ZnO nanowire by first-principle study. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Density Functional Theory Study on the Adsorption Mechanism of Sulphide Gas Molecules on α-Fe2O3(001) Surface. INORGANICS 2021. [DOI: 10.3390/inorganics9110080] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Sulphide gas is an impurity that affects the quality of natural gas, which needs reasonable storage and transportation. In this work, we investigated the adsorption structure and electronic behavior of hydrogen sulfide (H2S), carbonyl sulfur (COS), and methyl mercaptan (CH3SH) on sulphide gas molecules on pure and vacant α-Fe2O3(001) surfaces by density functional theory with geometrical relaxations. The results show that H2S and CH3SH are mainly adsorbed in the form of molecules on the pure Fe2O3(001) surface. On the vacant α-Fe2O3(001) surface, they can be adsorbed on Fe atoms in molecular form and by dissociation. The absolute value of the adsorption energy of H2S and CH3SH on the vacancy defect α-Fe2O3 surface is larger, and the density of states show that the electron orbital hybridization is more significant, and the adsorption is stronger. The charge differential density and Mulliken charge population analysis show that the charge is rearranged and chemical bonds are formed. The affinity of H2S to the vacancy α-Fe2O3(001) surface is slightly higher than that of CH3SH, while COS molecules basically do not adsorb on the α-Fe2O3(001) surface, which may be related to the stable chemical properties of the molecules themselves.
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15
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Shrinking-Core Model Integrating to the Fluid-Dynamic Analysis of Fixed-Bed Adsorption Towers for H2S Removal from Natural Gas. ENERGIES 2021. [DOI: 10.3390/en14175576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Natural gas sweetening is an essential process within hydrocarbon processing operations, enabling compliance with product quality specifications, avoiding corrosion problems, and enabling environmental care. This process aims to remove hydrogen sulfide (H2S), carbon dioxide, or both contaminants. It can be carried out in fixed-bed adsorption towers, where iron oxide-based solid sorbent reacts with the H2S to produce iron sulfides. This study is set out to develop a fluid-dynamic model that allows calculating the pressure drop in the H2S adsorption towers with the novelty to integrate reactivity aspects, through an iron sulfide layer formation on the solid particles’ external skin. As a result of the layer formation, changes in the particle diameter and the bed void fraction of the solid sorbent tend to increase the pressure drop. The shrinking-core model and the H2S adsorption front variation in time support the model development. Experimental data on pressure drop at the laboratory scale and industrial scale allowed validating the proposed model. Moreover, the model estimates the bed replacement frequency, i.e., the time required to saturate the fixed bed, requiring its replacement or regeneration. The model can be used to design and formulate new solid sorbents, analyze adsorption towers already installed, and help maintenance-planning operations.
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16
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Costa C, Cornacchia M, Pagliero M, Fabiano B, Vocciante M, Reverberi AP. Hydrogen Sulfide Adsorption by Iron Oxides and Their Polymer Composites: A Case-Study Application to Biogas Purification. MATERIALS 2020; 13:ma13214725. [PMID: 33105898 PMCID: PMC7660218 DOI: 10.3390/ma13214725] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/17/2020] [Accepted: 10/20/2020] [Indexed: 11/16/2022]
Abstract
An experimental study of hydrogen sulfide adsorption on a fixed bed for biogas purification is proposed. The adsorbent investigated was powdered hematite, synthesized by a wet-chemical precipitation method and further activated with copper (II) oxide, used both as produced and after pelletization with polyvinyl alcohol as a binder. The pelletization procedure aims at optimizing the mechanical properties of the pellet without reducing the specific surface area. The active substrate has been characterized in its chemical composition and physical properties by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), thermogravimetric analysis (TGA) and N2 physisorption/desorption for the determination of surface area. Both powders and pellets have been tested as sorbents for biogas purification in a fixed bed of a steady-state adsorption column and the relevant breakthrough curves were determined for different operating conditions. The performance was critically analyzed and compared with that typical of other commercial sorbents based on zinc oxide or relying upon specific compounds supported on a chemically inert matrix (SulfaTreat®). The technique proposed may represent a cost-effective and sustainable alternative to commercial sorbents in conventional desulphurization processes.
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Affiliation(s)
- Camilla Costa
- DCCI, Department of Chemistry and Industrial Chemistry, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy; (C.C.); (M.C.); (M.P.); (M.V.)
| | - Matteo Cornacchia
- DCCI, Department of Chemistry and Industrial Chemistry, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy; (C.C.); (M.C.); (M.P.); (M.V.)
| | - Marcello Pagliero
- DCCI, Department of Chemistry and Industrial Chemistry, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy; (C.C.); (M.C.); (M.P.); (M.V.)
| | - Bruno Fabiano
- DICCA, Department of Civil, Chemical and Environmental Engineering, Polytechnic School, Università degli Studi di Genova, Via Opera Pia 15, 16145 Genova, Italy;
| | - Marco Vocciante
- DCCI, Department of Chemistry and Industrial Chemistry, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy; (C.C.); (M.C.); (M.P.); (M.V.)
| | - Andrea Pietro Reverberi
- DCCI, Department of Chemistry and Industrial Chemistry, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy; (C.C.); (M.C.); (M.P.); (M.V.)
- Correspondence:
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Jiang B, Zhang J, Chen Y, Song H, Hao T, Kuang J. Ultrasonic-assisted preparation of highly active Co 3O 4/MCM-41 adsorbent and its desulfurization performance for low H 2S concentration gas. RSC Adv 2020; 10:30214-30222. [PMID: 35518214 PMCID: PMC9056334 DOI: 10.1039/d0ra05606e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 08/06/2020] [Indexed: 11/24/2022] Open
Abstract
Co3O4/MCM-41 adsorbents were successfully prepared by ultrasonic assisted impregnation (UAI) and traditional mechanical stirring impregnation (TMI) technologies and characterized by X-ray diffraction (XRD), N2 adsorption desorption, Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and thermogravimetry-differential thermal analysis (TG-DTA). The H2S removal performances for a simulated low H2S concentration gas were investigated in a fixed-bed. The effect of preparation and adsorption conditions on the H2S removal over Co3O4/MCM-41 were systematically examined. The results showed that UAI promotes more and well defined highly dispersed active Co3O4 phase on MCM-41. As compared to the Co3O4/MCM-41-T prepared via TMI, the saturated H2S capacity of Co3O4/MCM-41-U prepared via UAI improved by 33.2%. The desulfurization performance of adsorbents decreased in the order of Co3O4/MCM-41-U > Co3O4/MCM-41-T > MCM-41. The Co3O4/MCM-41-U prepared using Co(NO3)2 concentration of 10%, ultrasonic time of 2 h, calcination temperature of 550 °C and calcination time of 3 h exhibited the best H2S removal efficiency. At adsorption temperature of 25 °C with model gas flowrate of 20 mL min−1, the breakthrough time of Co3O4/MCM-41-U was 10 min, and the saturated H2S capacity and H2S removal rate was 52.6 mg g−1 and 47.8%, respectively. Co3O4/MCM-41 adsorbent with high surface area and more active sites was successfully prepared by ultrasonic assisted impregnation (UAI) technology and it has been found that the sulfur capacity was improved by 33.2% because of ultrasonication.![]()
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Affiliation(s)
- Bolong Jiang
- Innovation Institute for Sustainable Maritime Architecture Research and Technology
- Qingdao University of Technology
- Qingdao 266000
- China
| | - Jiaojing Zhang
- Provincial Key Laboratory of Oil & Gas Chemical Technology
- College of Chemistry & Chemical Engineering
- Northeast Petroleum University
- Daqing 163318
- China
| | - Yanguang Chen
- Provincial Key Laboratory of Oil & Gas Chemical Technology
- College of Chemistry & Chemical Engineering
- Northeast Petroleum University
- Daqing 163318
- China
| | - Hua Song
- Provincial Key Laboratory of Oil & Gas Chemical Technology
- College of Chemistry & Chemical Engineering
- Northeast Petroleum University
- Daqing 163318
- China
| | - Tianzhen Hao
- Hebei Jingzhi Technology Company Ltd
- Cangzhou 061000
- China
| | - Junhu Kuang
- Yumen Oilfield Company Refining and Chemical Plant
- China
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