FUEL
·
2021
·
IF 6.609
Guokai Cui,Shuzhen Lyu,Huiyong Wang,Zhiyong Li,Ruina Zhang,Jianji Wang
A series of pyridinolate anion-functional ionic liquids (ILs) containing different kinds of cations were designed and prepared, including tri- n -hexyltetradecylphosphonium [P 66614 ], tri- n -butylethylphosphonium [P 4442 ], and 1,1,3,3-tetramethylguandinium [TMG] cations and pyridinolate [PyO] anions with different N positions. Densities and viscosities at different temperatures were measured because of their importance for the absorption of SO 2 . Effect of different structures on the absorption of SO 2 was studied, including the type and the alkyl chain length of cations, and the N positions of [PyO] anions (2-, 3-, and 4-). Additionally, effects of SO 2 concentration and temperature for absorption were investigated. Especially, up to 6.00 and 2.53 mol SO 2 per mole IL could be obtained by [P 66614 ][4-PyO] at 1 bar and 0.1 bar of SO 2 , respectively, when absorptions performed at 20 °C. The results indicate that (1) the aprotic cations weakened the cation⋯anion interaction and resulted in the released active sites on the anions, and (2) N position has an influence on charge distribution of [PyO] anions and resulted in the tunable absorption of SO 2 . Reversible SO 2 absorption and [P 66614 ][4-PyO] regeneration could be performed several times without losing efficiency. Furthermore, the mechanism of absorption was studied through FT-IR and NMR methods and the results showed that the absorption of SO 2 by [P 66614 ][4-PyO] includes physisorption and chemisorption.
研究领域:
化学工程
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环境科学
·
材料科学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 8
·3605-3626
·
IF 3.3
Li Xing,Huhe Taoli,Zeng Tao,Ling Xiang,Huang Hongyu,Chen Yong
Carbon materials mainly capture sulfur dioxide (SO 2 ) from gas through physical adsorption, therefore their SO 2 capture performance will decrease with the increase in desulfurization temperature. In order to meet the stringent requirements of deep desulfurization, further improvements on carbon materials are necessary, improving their SO 2 capture performance and adaptability to changes in desulfurization temperature. In this study, a carbon material (NCP10) was modified with various alkali metal compounds with the aim of enhancing the SO 2 capture performance and adaptability to temperature changes. The results showed that the NCP10/LiOH composite had the best average SO 2 removal rate (100%) and SO 2 capture capacity ( \({113}.{6} \;{\text{mg}}_{{{\text{SO}}_{2} }} /{\text{g}}_{{{\text{material}}}}\) ) within the first hour of reacting at 60 °C, the SO 2 removal rate and SO 2 capture capacity of the NCP10/LiOH composite were 29% and 29% higher than those of the pure NCP10 material, respectively. While the SO 2 capture performance of the NCP10 modified with LiCl, Li 2 CO 3 , NaOH and KOH were not sufficient for deep desulfurization, the SO 2 capture performance of the NCP10/LiOH(2:1) composite was able to meet the requirements of deep desulfurization in the temperature range of 25–100 °C by the physical adsorption and chemical absorption synergistically effect.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 4
·445
·
IF 4.146
Yangyang Guo,Xiaofei Xu,Hong Gao,Yang Zheng,Lei Luo,Tingyu Zhu
Ca poisoning behavior is inevitable for high-calcium content flue gas, so V2O5-WO3/TiO2(VWT) and V2O5-WO3-CeO2/TiO2(VWCeT) catalysts with different vanadium content have been prepared and the Ca-doped catalysts are compared in this manuscript. The result shows Ce addition can both promote the NO conversion and the alkali resistance. Lower Ca addition for 0.1VWCeT catalyst promotes its oxidability and Ce modification is more suitable for low vanadium catalysts. The total acidity and the reducibility of catalysts decline after Ca doping, and the reducibility of the active species on catalysts has been strengthened by Ce addition. CeO2based catalysts with lower Ca loading struggle to resist sulfur poisoning, while higher Ca loading favors SO2adsorption and also physically reduces the cerium acidification process. In the presence of SO2, additional Brønsted acid sites are formed in Ca rich catalyst. The dynamic NH3adsorption has been investigated, shows that Ca doping content on catalyst is critical for SCR reaction, and the catalyst is more susceptible to SO2initially in alkali flue gas during the actual application, but the sulfur resistance may increase with the alkali-poisoning effect aggravated by Ca doping.Keywords:Ca-poisoning;SCR reaction;NO reduction;V2O5-WO3/TiO2and V2O5-WO3-CeO2/TiO2catalysts;SO2and water;NO removal efficiency
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2019
·Vol. 128
·期 2
·681-693
·
IF 1.428
Xie Chong,Yang Shenghui,Shi Jian-Wen,Niu Chunming
A novel MnO x –TiO 2 catalyst with hollow silkworm structure was synthesized successfully via an ethanol-thermal strategy by using activated carbon fiber felt as template for the first time. The silkworm-like MnO x –TiO 2 catalyst (MnTi) exhibited higher NO x conversion in the whole experimental temperature region (90–330 °C) under a high space velocity of 36,000 h −1 in comparison with the common MnO x –TiO 2 catalyst without hollow silkworm structure (MnTi-B). The excellent catalytic performance of MnTi can be attributed to its high specific surface area, large content of active surface oxygen species (O S ), and more surface acid sites. In addition, the MnTi catalyst also exhibited excellent resistance to water or SO 2 poisoning.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Xiangyu Zang,Zhaoyan Zhang,Yingqi Zhao,Gang Li,Hua Xie,Weiqing Zhang,Guorong Wu,Xueming Yang,Ling Jiang
Elucidating the effects of anthropogenic pollutants on the photooxidation of biogenic volatile organic compounds is crucial to understanding the fundamental mechanisms of secondary organic aerosol (SOA) formation. Here, the impacts of NO 2 and SO 2 on SOA formation from the photooxidation of a representative monoterpene , β -pinene, were investigated by a number of laboratory studies. The results indicated NO 2 enhanced the SOA mass concentrations and particle number concentrations under both low and high β -pinene conditions. This could be rationalized that the increased O 3 concentrations upon the NO x photolysis was helpful for the generation of more amounts of O 3 -oxidized products, which accelerated the SOA nucleation and growth. Combing with NO 2 , the promotion of the SOA yield by SO 2 was mainly reflected in the increase of mass concentration, which might be due to the elimination of the newly formed particles by the initially formed particles. The observed low oxidation degree of SOA might be attributed to the fast growth of SOA, resulting in the uptake of less oxygenated gas-phase species onto the particle phase. The present findings have important implications for SOA formation affected by anthropogenic–biogenic interactions in the ambient atmosphere.
研究领域:
大气科学
·
环境科学
✓ 已验证
DOI
高影响因子
Heliyon
·
2022
·
IF 3.776
Xing Li,Taoli Huhe,Tao Zeng,Xiang Ling,Zhenpeng Wang,Hongyu Huang,Yong Chen
Sulfur dioxide (SO 2 ) is an extremely harmful pollutant in diesel engine exhaust fumes, which must be controlled and removed effectively. In order to better integrate desulfurization materials into diesel exhaust systems, a new desulfurization powder coating (DeSO x coating) was prepared. The SO 2 capture performance and kinetics of the DeSO x coating were subsequently studied. This study used a fixed-bed reactor to test the DeSO x coating SO 2 capture performance and conduct kinetic analysis at various temperatures and gas flows. The analysis obtained the kinetic parameters of the activation energy and Arrhenius constant, with the derived rate control equations, under isothermal conditions. The DeSO x coating and filter which were prepared using metal oxide powders, SiO 2 colloidal sol, and additives, exhibited an enhanced SO 2 capture performance. In this experiment, an MnO 2 /SiO 2 /LiOH coating had the best SO 2 removal rate and capture capacity at 400 °C. Under a reaction space velocity of 10700 h −1 , the MnO 2 /SiO 2 /LiOH coating SO 2 removal rate was 100% within the first hour of reaction. Under a reaction space velocity of 32000 h −1 , the MnO 2 /SiO 2 /LiOH coating SO 2 capture capacity was 132.7 mg SO2 /g material during the second hour of reaction. The SO 2 capture conversion rate of the DeSO x coating and filter follows the second-order kinetic mechanism model. For the MnO 2 /SiO 2 /LiOH coating, the Arrhenius equation gives an activation energy of 4952 J/mol and the Arrhenius natural logarithmic constant is 8.969 s −1 . For the MnO 2 /SiO 2 /LiOH filter, the activation energy of the rate constant is 214 J/mol, and the Arrhenius natural logarithmic constant is 3.744 s −1 . Therefore, the desulfurization coating is an effective way to remove SO 2 pollutants from diesel exhaust gases.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yongfei Huang,Yongbin Zhang,Fangjun Huo,Jianbin Chao,Caixia Yin
Sulfur dioxide (SO 2 ), as the main member of reactive sulfur species (RSS), it is mainly produced in mitochondria and involved in a variety of activities at the cellular level. Excessive inhalation of SO 2 could cause respiratory tract damage, cardiovascular disease and even cancer. The mitochondrial and lysosomal as two important organelles, their interactions (fusion and contact) are important for maintaining eukaryotic homeostasis. Some study indicated that SO 2 is active in the above interaction process. In this work, benzopyranium salt unit was constructed as fluorophore I, where O + was the mitochondrial target site, and naphthalimide was linked to morpholine to construct fluorophore II, where morpholine was the lysosomal target group. Studies have shown that the probe has a good performance in targeting both mitochondria and lysosomes. And after the reaction with SO 2 , FRET was broken, resulting in red quenching, and green emitting, which made it can detect SO 2 with a ratiometric response. Cells cultured with nystatin showed decreased red and green fluorescence increased, indicating that the autophagy of mitochondria produced SO 2 . In addition, synthesized control reagents (targeting lysosomes alone and responding to SO 2 ) from no signal to gradually enhanced blue fluorescence, indicating that SO 2 produced by mitochondria is transferred to lysosomes. What's more, it could monitor the changes of SO 2 concentration under heat stroke. More importantly, it could quantitatively detect sulfite concentration in Yuba and crystal sugar.
研究领域:
生物化学
·
细胞生物学
·
分析化学
·
毒理学
·
食品科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Leipeng Ji,Haomiao Xu,Xiaoming Sun,Wenjun Huang,Zan Qu,Yongjun Wang,Anbang Zhang,Naiqiang Yan
Sulfidation has been an efficient method for arsenic (As) removal from acid wastewater, yet it is inefficient under neutral and weak acid conditions. The higher pH values resulted in the formation of the unstable As-S precipitates, especially employing Na 2 S as the vulcanizing agent as it can increase the pH value dramatically. Here, we found that SO 2 exhibited excellent multi-roles in As removal when applying H 2 S-sulfidation method. The acidification effect of SO 2 lead to the decreasing of pH values, guaranteed the stable As-S precipitates formation. Through the SO 2 pre-treatment method, the results indicated that the pH values decreased from 7 to 2.8, with the increased H 2 S utilization efficiencies for As(III) removal from 20.9% to 92.0%. Moreover, SO 2 post-treatment not only increased the As(III) removal efficiency, but also eliminated the excessive sulfides in solution. The reaction mechanism analysis indicated that the liquid comproportionation reaction between SO 2 and excessive sulfides plays a vital role. The generated nascent sulfur (N-S 0 ) can adsorb arsenic species and promote the agglomeration of As(III)-S precipitates. Furthermore, the SO 2 and H 2 S co-treatment exhibited excellent As(V) removal performance. This study provides a new alternative method to improve the H 2 S-sulfidation process with SO 2 for As removal from wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Shuyan Wang,Lin Du,Narcisse T. Tsona,Xiaotong Jiang,Bo You,Li Xu,Zhaomin Yang,Wenxing Wang
Methylglyoxal (CH 3 COCHO, MG), which is one of the most abundant α-dicarbonyl compounds in the atmosphere, has been reported as a major source of secondary organic aerosol (SOA). In this work, the reaction of MG with hydroxyl radicals was studied in a 500 L smog chamber at (293 ± 3) K, atmospheric pressure, (18 ± 2)% relative humidity, and under different NO x and SO 2 . Particle size distribution was measured by using a scanning mobility particle sizer (SMPS) and the results showed that the addition of SO 2 can promote SOA formation , while different NO x concentrations have different influences on SOA production. High NO x suppressed the SOA formation, whereas the particle mass concentration, particle number concentration and particle geometric mean diameter increased with the increasing NO x concentration at low NO x concentration in the presence of SO 2 . In addition, the products of the OH-initiated oxidation of MG and the functional groups of the particle phase in the MG/OH/SO 2 and MG/OH/NO x /SO 2 reaction systems were detected by gas chromatography mass spectrometry (GC-MS) and attenuated total reflection fourier transformed infrared spectroscopy (ATR-FTIR) analysis. Two products, glyoxylic acid and oxalic acid , were detected by GC-MS. The mechanism of the reaction of MG and OH radicals that follows two main pathways, H atom abstraction and hydration, is proposed. Evidence is provided for the formation of organic nitrates and organic sulfate in particle phase from IR spectra. Incorporation of NO x and SO 2 influence suggested that SOA formation from anthropogenic hydrocarbons may be more efficient in polluted environment.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Tianyu Li,Mengna Zhan,Rongkun Jiang,Yiqing Zeng,Shule Zhang,Zhaoxiang Zhong
CuO-based catalysts have garnered significant attention for CO oxidation reaction, while their susceptibility to sulfur poisoning limits their practical application in industrial flue gas treatment. In this study, three CuTi oxide catalysts with distinct CuO-TiO 2 heterointerfaces were prepared by sol-gel, impregnation, and mechanical mixing methods to investigate the influence of interfacial structure on CO oxidation activity and SO 2 tolerance. Catalytic performance and characterization show that a high-density CuO-TiO 2 heterointerface can induce the formation of strong Cu Ti interactions and improve the dispersion of copper species. These effects facilitate CO adsorption and increase oxygen vacancy concentration, thereby enhancing the low-temperature CO oxidation activity. Although the high-density heterointerface enhances SO 2 adsorption capacity, the accompanying strong Cu Ti interaction reduces the stability of copper sulfate (Cu-O-S) species. This promotes the decomposition of copper sulfate and helps preserve active sites, thus improving SO 2 tolerance. This work offers new insights into the rational design of sulfur-tolerant CuO-based catalysts for CO oxidation.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wenxiang Zhang,Yue Wu,Yongzheng Wang,Heping Ma
Selective capture of sulfur dioxide (SO 2 ) is of great significance in the context of environmental protection, yet it remains an ongoing challenge. To address inefficient SO 2 removal from flue gas, this study synthesized a cage-like organic network (CON) and converted it into an ionic I-CON via facile quaternization modification. Solid-state 13 C NMR, XPS, SEM and TEM-EDS confirmed iodine ion (I − ) incorporation in I-CON, narrowing its pore size to 1.05 nm. Single-component gas adsorption experiments demonstrated that I-CON exhibits an SO 2 uptake as high as 16.44 mmol/g at 298 K, surpassing that of CON (11.54 mmol/g). Furthermore, the IAST (Ideal Adsorbed Solution Theory) selectivity of I-CON for SO 2 /CO 2 binary gas mixture also exceeded that of CON (112.10 vs 93.96). Dynamic tests showed I-CON has prolonged SO 2 breakthrough time to 3592 s, indicating that the high dynamic selectivity of I-CON for SO 2 /CO 2 and SO 2 /N 2 . DFT calculations revealed that the synergistic effect between the surface electric field-mediated induced polarization and charge transfer in I-CON significantly enhances its selective adsorption performance toward SO 2 . This study validates the potential of I-CON in the efficient capture of SO 2 .
研究领域:
环境科学
·
材料化学
·
气体分离
·
吸附技术
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Xinyu Han,Liangliang Jiang,Zeshu Zhang,Kaijie Liu,Mengyao Bian,Zhaoxu Yuan,Yannan Li,Cheng Rao,Xiangguang Yang,Yibo Zhang
Cerium-based catalysts for the selective catalytic reduction of NOx with ammonia (NH3-SCR) face significant challenges in practical applications, particularly their poor low-temperature activity and susceptibility to SO2 poisoning. In this study, photothermal catalysis was innovatively applied to the NH3-SCR reaction over MoWOx/CeO2 catalysts, achieving remarkable improvements in the low-temperature performance and SO2 resistance. Under photothermal conditions, the catalyst maintained NOx conversion above 90% at 200 °C, even in the presence of 250 ppm of SO2. Comprehensive characterization revealed that light irradiation significantly enhanced the formation of oxygen vacancies on the catalyst surface and weakened NO adsorption, indicating that the NH3-SCR reaction follows the Eley–Rideal mechanism, which contributes to its excellent low-temperature activity. Moreover, photothermal conditions reduced the chemical adsorption intensity of SO2, effectively inhibiting the formation of ammonium sulfate. Density functional theory calculations further demonstrated that the narrow band gap of MoWOx promotes electron transfer from the O 2p orbital to the Ce 4f orbital at the Ce–O–Mo(W) interface under light, leading to electron enrichment at active sites and suppression of SO2 oxidation. This work not only provides a novel strategy for enhancing the NH3-SCR performance but also represents a groundbreaking advancement in the design of highly efficient, SO2-resistant catalysts for low-temperature applications.
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产品关联
DOI
PubMed
高影响因子
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