CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Qiang Liu,Bingsi Liu,Qinze Liu,Qiuyue Zhang,Rongnian Xu,Xuanyue Wu,Hong Xia
Refined design of sustainable sorbent demands to tackle the strong dependence for additional mesoporous support and low utilization in hot coal gas desulfurization. Unlike the well-established preparation of loading sorbents supported on zeolites, a vacuum-assisted self-assemble strategy tapping into the ordered channels of walnut wood is proposed to facilely fabricate three-dimensional (3D) (a%Ce–Mn) y Al 2−y O x desulfurizers with anisotropy which provides a desirable macroporosity for rapid diffusion of H 2 S. Benefiting from the inherent straight channle in micron scale, the obtained (8%Ce–Mn) 1.5 Al 0.5 O x presents the highest breakthrough sulfur capacity (289.79 mg g −1 ) and effective utilization (88.42%) at 700 °C. The favorable rapid diffusion of gases in micro/macropores improves greatly the H 2 O-resistance and anti-interference ability of 3D (8%Ce–Mn) 1.5 Al 0.5 O x for high steam and concentration of reducing gas. The fast mass transport in sulfidation reaction at 700 °C is described perfectly by the improved deactivation kinetics model. This study opens a novel design of the ideal 3D desulfurizers with micron porosity inherited from hierarchical architecture of walnut wood for industrialization utilization in the near future.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Gaoshan Xing,Silan Li,Yongguang Wang,Yutai Zhang,Wenbo Wang,Wen Wang,Liqiang Qi
To address the requirements of low-temperature dry flue gas desulfurization (FGD) in hot blast furnaces of steel mills, a high-activity calcium hydroxide (Ca(OH) 2 ) desulfurizer was synthesized using a simple quicklime digestion method. The incorporation of the metal oxide Al 2 O 3 and an organic additive digestion solution (comprising 1.5 wt% urea, 1.5 wt% polyethylene glycol 400 (PEG), and 3 wt% triethanolamine (TEA)) enhanced the physical morphology and chemical properties of the desulfurizers. The specific surface area increased from 3.23 m 2 /g (quicklime) to 43.24 m 2 /g, the pore volume and average pore size are enhanced to 0.195 cm 3 /g and 0.013 nm. The synthesized desulfurizer demonstrated a remarkable 100 % removal efficiency, a high sulfur capacity of 21.49 mg/g, and an extended breakthrough time of 48.5 min under simulated flue gas conditions (100℃, 3 % O 2 , and 15 % CO 2 ). Following adaptability and carbon dioxide resistance tests in the laboratory, 10 tons of the preferred desulfurizer, designated CA@UPT #1, were produced in the quicklime digestion factory and subsequently tested in the steel mill. After two pilot tests, the improved desulfurizer, CA@UPT #2, successfully achieved the ultra-low emission standard in China (35 mg/Nm 3 ). Characterization techniques, including BET, SEM, TEM, HRTEM, XRD, XPS, and particle size distribution analysis, were employed to investigate the reaction mechanism. Additionally, kinetic and diffusion studies were conducted on both lab- and industry-produced calcium powders. The economic advantages of this desulfurizer were underscored through cost calculations. The superior performance in FGD indicates the significant potential of calcium powder desulfurization, and an analysis of influencing factors was summarized to facilitate the advancement of Ca(OH) 2 powder desulfurization technology.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
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IF 4.765
Chenhui Liu,Pengfei Zhao,Xiongjin Zhu,C. Srinivasakannan,Minghong Chen,Mengping Zhang
Dielectric properties of stibnite concentrate, pure antimony sulfide, three different desulfurizers and their mixtures were assessed using resonant cavity perturbation technique. Dielectric properties of ZnO and CaO are largely independent of temperature, while CuO and Sb 2 S 3 have strong dependency with temperature. For the mixtures, the Sb 2 S 3 + CuO exhibit strong responsiveness to microwave from 25 °C to 400 °C. The CuO could be efficiently heated and reacted with Sb 2 S 3 in microwave field, in agreement with thermodynamic result. Based on the dielectric properties and thermochemical characteristics during the desulfurization process, the phase evolution and reaction mechanism were systematically investigated. Results show that the majority of antimony elements in the concentrate were volatilized in the form of Sb 2 O 3 and the rest were left in the form of Sb. Effects of roasting temperature, desulfurizer dosage, and holding duration on microwave roasting were assessed and roasted sample were subjected to XRD, EDX and SEM analysis. Optimum roasting conditions were identified to be 700 °C, 1.4 times the stoichiometric requirement of CuO additive and holding duration of 1.5 h. Microwave roasting of stibnite concentrate with CuO additive promises to be a better alternative technology for traditional pyrometallurgical antimony roasting.
研究领域:
材料科学
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冶金工程
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化学工程
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DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2022
·Vol. 39
·期 12
·3305-3314
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IF 3.146
Liu Zhihao,Qiu Kui,Dong Yu,Jin Zhaobo,Liu Luwei,Wu Jirong
A non-aqueous phase (Sb/Fe/NMP) desulfurization system for the removal of hydrogen sulfide from natural gas was constructed by introducing SbCl 3 and FeCl 3 in a specific ratio into N-methylpyrrolidone (NMP). The desulfurizing agent and its sulfur product were characterized, and the absorption pattern of H 2 S by the system was investigated by static desulfurization experiments. The results indicate that the desulfurizer’s sulfur capacity can reach 16 g/L at room temperature and pressure, and that adding the optimum amount of water and appropriate temperature increase can assist to increase desulfurization efficiency. The system maintained a sulfur capacity level of more than 90% of the initial sulfur capacity after five consecutive desulfurization-regeneration cycles. XRD and XPS spectrogram revealed that the regenerated solid product was high purity sulfur. Sb 3+ is a key component to ensure the effective absorption of H 2 S. The presence of a moderate amount of Fe 3+ can oxidize and absorb small amounts of H 2 S and promote the oxidative regeneration of the system. In addition, we combined the obtained experimental data with density flooding theory (DFT) theoretical calculations to show that the effective coordination of Sb(III) with HS − in the NMP environment is the main reason for the effective absorption of H 2 S by the desulfurizer. NMP is not involved in the coordination absorption process of hydrogen sulfide.
研究领域:
化学工程
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环境科学
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理论化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）