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学者姓名：郑勇
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Abstract ：
针对传统两级式LED驱动电源中存在着半导体功率器件数目多,控制电路复杂,效率低,成本高,可靠性差等问题,提出一种单级无桥Sepic谐振LED驱动电路,通过将单开关无桥Sepic电路主开关管与半桥LLC电路下开关管复用集成单级LED驱动电路,减少了半导体功率器件数目,简化控制电路,提高了电路效率和工作可靠性.详细分析了所提出电路的工作原理和工作过程,深入开展了电路输入输出电压变比、网侧特性、软开关特性等稳态特性推导和电路关键参数设计,并针对所提出单级电路由于输入电压变化引起直流母线电压变动范围大等问题,分析设计了一种APWM-PFM混合控制策略.最后进行计算机仿真分析,并设计一台交流输入185～265 Vrms、额定输出2A/96W的实验样机,样机效率最高可达91.5%,PF最大值为0.995,THD最小为5.5%,不同交流电压下直流母线电压总体变化范围在60V以内,实现直流母线电压限压.计算机仿真结果和实验结果验证所提出电路和混合控制策略的理论预期和有效性.
Keyword ：
LED照明 LED照明 功率因数校正 功率因数校正 单级无桥Sepic/LLC电路 单级无桥Sepic/LLC电路 直流母线电压APWM-PFM混合控制 直流母线电压APWM-PFM混合控制 软开关 软开关
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| GB/T 7714 | 林中寅 , 林维明 , 黄舒晨 et al. 单级无桥Sepic谐振LED驱动电路及其APWM-PFM混合控制 [J]. | 电机与控制学报 , 2024 , 28 (9) : 106-124 . |
| MLA | 林中寅 et al. "单级无桥Sepic谐振LED驱动电路及其APWM-PFM混合控制" . | 电机与控制学报 28 . 9 (2024) : 106-124 . |
| APA | 林中寅 , 林维明 , 黄舒晨 , 郑勇 . 单级无桥Sepic谐振LED驱动电路及其APWM-PFM混合控制 . | 电机与控制学报 , 2024 , 28 (9) , 106-124 . |
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Catalytic combustion shows promise in mitigating methane emissions from natural gas utilization, while the presence of sulfur species in natural gas can cause significant catalyst deactivation. Herein, a dual-modification strategy is proposed to construct active and sulfur-resistant nickel oxide (NiO)-based catalysts. Through regulating the hydrolysis of the silicon (Si) precursor and the precipitation of zirconium (Zr) and nickel (Ni) precursors, both the Si and Zr component could enter NiO lattice to generate strong interactions, leading to a decrease in crystallite size, an increase in active Ni2+ and surface adsorbed oxygen species for the efficient methane combustion. The incorporation of Si prominently enhanced the surface acidity of catalysts to inhibit the sulfating of NiO; the introduced Zr component also contributed to the generation of surface acid sites, and had a preferential interaction with sulfur dioxide (SO2) to protect Ni2+ sites. Consequently, the small NiO crystallites, active Ni2+ and oxygen species could be maintained in dual-modified catalysts under sulfur-containing reaction conditions, leading to the superior catalytic performance compared to NiO or catalysts modified by Zr or Si. This work introduces a practical and efficient approach for developing catalysts to remove gaseous pollutants.
Keyword ：
Catalytic combustion of methane Catalytic combustion of methane Modified NiO Modified NiO Si and Zr-incorporation Si and Zr-incorporation Sulfur-resistance Sulfur-resistance Surface acidity Surface acidity
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| GB/T 7714 | Tian, Chengchen , Lin, Jia , Lin, Li et al. A silicon-zirconium dual-modified nickel oxide with high activity and sulfur-resistance for catalytic combustion removal of methane [J]. | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 13 (1) . |
| MLA | Tian, Chengchen et al. "A silicon-zirconium dual-modified nickel oxide with high activity and sulfur-resistance for catalytic combustion removal of methane" . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 13 . 1 (2024) . |
| APA | Tian, Chengchen , Lin, Jia , Lin, Li , Zheng, Yong , Xiao, Yihong , Zheng, Ying . A silicon-zirconium dual-modified nickel oxide with high activity and sulfur-resistance for catalytic combustion removal of methane . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 13 (1) . |
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It is essential to develop catalysts that demonstrate outstanding catalytic activity and N2 selectivity to effectively purify NH3-containing waste gas through selective oxidation of NH3. Herein, we present a facile strategy to construct high-performance CuO-based catalysts through the incorporation of niobium (Nb) component. The Nb species with molar ratios of 0.05-0.2 could enter the CuO lattice and generate Cu-O-Nb bonds, resulting in lattice distortion and weakened Cu-O bond, which enhanced the redox properties as well as surface acidity of CuO. The catalytic activity was improved by the increased Cu+, surface chemisorbed oxygen species, and weak acid sites, while N2 selectivity was promoted mainly due to the generation of moderate and strong acid sites. The catalyst with a relatively low content of Nb (molar ratio of 0.1) exhibited optimal redox properties and surface acidity, which facilitated the reaction to proceed through both imide and i-SCR mechanisms, resulting in significantly enhanced catalytic activity, stability, and N2 selectivity compared to CuO. This investigation underscores the importance of dual modification of redox properties and surface acidity of catalysts for improving catalytic performance.
Keyword ：
CuO-based catalysts CuO-based catalysts Nb-incorporation Nb-incorporation NH 3-SCO reaction NH 3-SCO reaction Redox property Redox property Surface acidity Surface acidity
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| GB/T 7714 | Pang, Lei , Gao, Mengjie , Lin, Jia et al. Redox-acidity dual modification of CuO by niobium-incorporation for enhanced selective catalytic oxidation of NH3 [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 354 . |
| MLA | Pang, Lei et al. "Redox-acidity dual modification of CuO by niobium-incorporation for enhanced selective catalytic oxidation of NH3" . | SEPARATION AND PURIFICATION TECHNOLOGY 354 (2024) . |
| APA | Pang, Lei , Gao, Mengjie , Lin, Jia , Zheng, Yong , Xiao, Yihong , Zheng, Ying et al. Redox-acidity dual modification of CuO by niobium-incorporation for enhanced selective catalytic oxidation of NH3 . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 354 . |
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The efficient adsorption of sulfur dioxide (SO2) is crucial for purifying exhaust gases, and zeolites are promising adsorbents due to their low cost and excellent stability. However, developing FAU-type zeolites with high adsorption capacities and selectivities remains challenging due to their narrow pores and limited adsorption sites. Herein, an additive-free synthesis strategy is proposed to facilely obtain NaX zeolites (X-HCL) with the house-of-card-like morphology. The hierarchical structure of X-HCL not only benefits the removal of SO2 through favorable spatial diffusion, but also promotes the loading of basic adsorption sites- [caprolactam] [tetrabutylammonium bromide] (CT) ionic liquid. The obtained CT/X-HCL adsorbent demonstrates remarkable SO2 adsorption capacity (10.58 mmol/g) and cyclic stability, as well as great selectivity of SO2/N-2 (1673) and SO2/ CO2 (219) due to the strong affinity of CT towards SO2. Moreover, co-feeding with water vapor benefits the adsorption of SO2 on CT/X-HCL owing to the enhanced chemisorption of hydrated CT for SO2. This research provides new insights into the construction of hierarchical zeolite for efficient adsorption and separation of SO2.
Keyword ：
Hierarchical Hierarchical House-of-card-like morphology House-of-card-like morphology Ionic liquid Ionic liquid NaX zeolite NaX zeolite Sulfur dioxide adsorption Sulfur dioxide adsorption
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| GB/T 7714 | Zhang, Qiongdan , Ye, Ming , Lei, Yuanyi et al. Additive-free synthesis of house-of-card NaX zeolite for supporting amine: An efficient adsorbent for SO2 removal [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 354 . |
| MLA | Zhang, Qiongdan et al. "Additive-free synthesis of house-of-card NaX zeolite for supporting amine: An efficient adsorbent for SO2 removal" . | SEPARATION AND PURIFICATION TECHNOLOGY 354 (2024) . |
| APA | Zhang, Qiongdan , Ye, Ming , Lei, Yuanyi , Wang, Heng , Zheng, Yong , Xiao, Yihong et al. Additive-free synthesis of house-of-card NaX zeolite for supporting amine: An efficient adsorbent for SO2 removal . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 354 . |
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The amine -based materials pose high potential for the adsorption of sulfur dioxide (SO 2 ). This work is aimed at modulating the morphologies of SBA -15 adsorbents by controlling the precursor self -assembly processes, for the sake of optimizing the utilization efficiency of amine species in the polytertiary amine (PTA)-functionalized SBA15. It results that worm -like SBA -15 (WLS) material shows a better particle aspect ratio and well-defined pore structure, which helps to optimize the adsorption sites invoked by the preferable dispersion and exposure of PTA, thus amplifying the chemisorption of SO 2 on the adsorbent. Consequently, the functionalized WLS-PTA adsorbent exhibits remarkable SO 2 adsorption performance (15.43 mmol/g), exceptionally high selectivities of SO 2 /N 2 (27522) and SO 2 /CO 2 (652). Surprisingly, the desulfurization capacity can be further enhanced by the positive effect of the water vapor co -fed. It is unveiled that the whole SO 2 adsorption process mainly follows the dual site Langmuir-Freundlich isotherm model and Bangham model. This work sheds light on the design of polymer -solid composite adsorbents for selective capture of SO 2 .
Keyword ：
Mesoporous SBA-15 Mesoporous SBA-15 Polytertiary amine Polytertiary amine Selective desulfurization Selective desulfurization SO2 adsorption SO2 adsorption Solid amine adsorbent Solid amine adsorbent
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| GB/T 7714 | Zhang, Qiongdan , Lei, Yuanyi , Ye, Ming et al. Facilely tuning the morphologies of tertiary amine-functionalized SBA-15 for optimizing selective SO 2 capture [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 487 . |
| MLA | Zhang, Qiongdan et al. "Facilely tuning the morphologies of tertiary amine-functionalized SBA-15 for optimizing selective SO 2 capture" . | CHEMICAL ENGINEERING JOURNAL 487 (2024) . |
| APA | Zhang, Qiongdan , Lei, Yuanyi , Ye, Ming , Wang, Heng , Zheng, Yong , Xiao, Yihong et al. Facilely tuning the morphologies of tertiary amine-functionalized SBA-15 for optimizing selective SO 2 capture . | CHEMICAL ENGINEERING JOURNAL , 2024 , 487 . |
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Ordered mesoporous carbon@silica hybrid frameworks with high nitrogen content and good stabilities show great significance to improve their functionalities. Herein, we report novel nitrogen-doped (3.51 - 4.62 wt%) and ordered mesoporous carbon@silica frameworks (N-OMC@SiO2) with reinforced nitrogen stability. The NOMC@SiO2 were designed from tricomponent direct co-assembly between block copolymer template and mixed precursors containing urea and tetramethoxysilane without using additional solvent. The N-OMC@SiO2 have large BET surface areas (444.3 - 674.9 m2/g), uniform mesoporous channels (5.8 - 10.9 nm) with well-defined hexagonal symmetry, and stable carbon@silica "reinforced concrete" framework that can be transformed into carbon@silicon by controllable reduction. The nitrogen sites were firmly embedded into their frameworks via the formation of Si-N bonding. Thus, the resulted N-OMC@SiO2 exhibit multi-functionalities and enhanced recyclability in acid waste gas capture and gaseous sulfides catalytic utilization, better than many reported porous adsorbents and catalysts. This study may help develop stable and efficient N-OMCs nanocomposites for acidic gas selective removal.
Keyword ：
Acid gas selective capture Acid gas selective capture Carbon@silica composites Carbon@silica composites Gaseous sulfides elimination Gaseous sulfides elimination Nitrogen -doping Nitrogen -doping Ordered mesoporosity Ordered mesoporosity Solvent -free synthesis Solvent -free synthesis
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| GB/T 7714 | Kan, Xun , Liu, Zihao , Sun, Yafei et al. Tricomponent direct co-assembly to nitrogen-doped, ordered mesoporous carbon@silica frameworks with enhanced nitrogen stability and multi-functionalities [J]. | CHEMICAL ENGINEERING SCIENCE , 2024 , 292 . |
| MLA | Kan, Xun et al. "Tricomponent direct co-assembly to nitrogen-doped, ordered mesoporous carbon@silica frameworks with enhanced nitrogen stability and multi-functionalities" . | CHEMICAL ENGINEERING SCIENCE 292 (2024) . |
| APA | Kan, Xun , Liu, Zihao , Sun, Yafei , Zhong, Shouchao , Zheng, Yong , Liang, Shijing et al. Tricomponent direct co-assembly to nitrogen-doped, ordered mesoporous carbon@silica frameworks with enhanced nitrogen stability and multi-functionalities . | CHEMICAL ENGINEERING SCIENCE , 2024 , 292 . |
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Selective adsorption of sulfur dioxide (SO2) is an important clean technology for purification of exhaust gas from fossil fuel combustion. The widely applied zeolite-based adsorbents interact with SO2 through weakly physical adsorption, resulting in low adsorption capacity and selectivity for SO2. Herein, a facile strategy that combines improving the textural property of zeolite and optimizing adsorption sites is developed for efficient and stable SO2 adsorption. The micro-mesoporous silica sphere (MS) with high specific surface area and well-defined pore structure is obtained through a micelle expander assisted soft-template method, which can facilitate the dispersion and exposure of designed adsorption sites- methylated polyethyleneimine (mPEI). Since the Lewis basic sites of N in mPEI can strongly interact with the pi-receptor SO2, and the tertiary amine groups exhibit a weak attraction for CO2, the optimized MS supported mPEI adsorbent exhibits remarkable SO2 adsorption performance (7.5 mmol/g), exceptionally high SO2/N2 selectivity (16673) and SO2/CO2 selectivity (551). Moreover, it presents an outstanding stability in the adsorption-regeneration test. This work sheds light on the design of high-performance organic-solid composite adsorbent for selective capture of SO2.
Keyword ：
Adsorption Adsorption Micro-mesoporous silica sphere Micro-mesoporous silica sphere Polytertiary amine Polytertiary amine Selective desulfurization Selective desulfurization SO 2 capture SO 2 capture
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| GB/T 7714 | Zhang, Qiongdan , Wei, Jixiang , Gao, Changbo et al. Highly selective capture of SO2 with supported micro-mesoporous silica sphere from CO2-rich environment [J]. | JOURNAL OF CLEANER PRODUCTION , 2024 , 436 . |
| MLA | Zhang, Qiongdan et al. "Highly selective capture of SO2 with supported micro-mesoporous silica sphere from CO2-rich environment" . | JOURNAL OF CLEANER PRODUCTION 436 (2024) . |
| APA | Zhang, Qiongdan , Wei, Jixiang , Gao, Changbo , Zheng, Yong , Xiao, Yihong , Liu, Fujian et al. Highly selective capture of SO2 with supported micro-mesoporous silica sphere from CO2-rich environment . | JOURNAL OF CLEANER PRODUCTION , 2024 , 436 . |
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NH3 reversible adsorption and separation show great significance during its production and utilization, tradi-tional adsorbents show either complex synthetic procedures or unsatisfied separation precision. We report here a class of sulfonic group functionalized and ordered mesoporous silica superacids (OMS-SO3H-xs) via enhanced host-guest assembly between copolymer templates and silica precursors without additional solvent. The OMS-SO3H-xs have large surface areas (463.7-910.5 m2/g), abundant micropores tandem well-ordered mesopores, high concentration of -SO3H (2.5 mmol/g) with extremely-high acid strength. Consequently, the OMS-SO3H-xs exhibit ultra-high precision for NH3 reversible adsorption and separation, giving high NH3 capacity (9.0 & 7.6 mmol/g at 25 & 50 degrees C and 1.0 bar) with extraordinary NH3/N2 (0.1/0.9) Ideal Adsorption Solution Theory (IAST) selectivities (1200 & 2235). The room temperature saturated breakthrough NH3 capacities of OMS-SO3H-xs were up to 3.38 mmol/g (3.0v%NH3/24.75v%N2/72.25v%H2), which can be well-maintained after 8th cycling without attenuation. The above features found in the OMS-SO3H-xs were resulted from their high density of -SO3H superacid sites those were homogeneously anchored into the ordered mesoporosity, which not only enhances their interaction with NH3, but also achieves the controllable NH3 interaction and transportation inside the mesochannels.
Keyword ：
Enahnced host-guest assembly Enahnced host-guest assembly NH 3 controllable transportation NH 3 controllable transportation Ordered mesopores Ordered mesopores Reversible adsorption and separation Reversible adsorption and separation Solid superacids Solid superacids
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| GB/T 7714 | Zhang, Wentao , Liu, Fengqing , Kan, Xun et al. Developing ordered mesoporous silica superacids for high-precision adsorption and separation of ammonia [J]. | CHEMICAL ENGINEERING JOURNAL , 2023 , 457 . |
| MLA | Zhang, Wentao et al. "Developing ordered mesoporous silica superacids for high-precision adsorption and separation of ammonia" . | CHEMICAL ENGINEERING JOURNAL 457 (2023) . |
| APA | Zhang, Wentao , Liu, Fengqing , Kan, Xun , Zheng, Yong , Zheng, Anmin , Liu, Fujian et al. Developing ordered mesoporous silica superacids for high-precision adsorption and separation of ammonia . | CHEMICAL ENGINEERING JOURNAL , 2023 , 457 . |
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Selective catalytic oxidation of H2S into elemental sulfur has been recognized as the optimal route for H2S reutilization, but traditional metal catalysts show poor sulfur resistance. Herein, we report a solvent-free route for designing nitrogen and defects co-doped, ordered mesoporous carbons (ND-OMCs) from co-assembly of block copolymer template with nitrogen-containing oligomers and silica defects directing agent. Through thermal curing, carbonization and etching of silica, the microporosity tandem ordered mesopores, abundant nitrogen sites (6.13 wt%) and structural defects were introduced into ND-OMCs. The ND-OMCs were successfully applied as efficient and long-lived metal-free catalysts for H2S selective oxidation to sulfur, giving nearly 100 % H2S conversion and sulfur selectivity at only 150 degrees C. Their remark-able activities of ND-OMCs can be well-maintained over 157 h of continuous reaction, exhibiting the sul-fur capacity as high as 3295 mg/g, which were much better than mostly desulfurizes such as commercial Fe2O3, g-C3N4, and nitrogen-containing, ordered mesoporous carbons.(c) 2023 Elsevier Ltd. All rights reserved.
Keyword ：
H2S catalytic reutilization H2S catalytic reutilization Nitrogen-doped porous carbon Nitrogen-doped porous carbon Ordered mesoporosity Ordered mesoporosity Structural defects Structural defects Sustainable design Sustainable design
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| GB/T 7714 | Kan, Xun , Song, Feiyu , Zhang, Guanqing et al. Sustainable design of co-doped ordered mesoporous carbons as efficient and long-lived catalysts for H2S reutilization [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 269 . |
| MLA | Kan, Xun et al. "Sustainable design of co-doped ordered mesoporous carbons as efficient and long-lived catalysts for H2S reutilization" . | CHEMICAL ENGINEERING SCIENCE 269 (2023) . |
| APA | Kan, Xun , Song, Feiyu , Zhang, Guanqing , Zheng, Yong , Zhu, Qiliang , Liu, Fujian et al. Sustainable design of co-doped ordered mesoporous carbons as efficient and long-lived catalysts for H2S reutilization . | CHEMICAL ENGINEERING SCIENCE , 2023 , 269 . |
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The activation of H2O is a key step of the COS hydrolysis,which may be tuned by oxygen vacancy defects in the catalysts.Herein,we have introduced Cu into Co3O4 to regulate the oxygen vacancy defect content of the catalysts.In situ DRIFTS and XPS spectra reveal that COS and H2O are adsorbed and activated by oxygen vacancy.The 10 at％Cu doped Co3O4 sample(10Cu-Co3O4)exhibits the optimal activity,100％of COS conversion at 70 ℃.The improved oxygen vacancies of Cu-Co3O4 accelerate the activation of H2O to form active-OH.COS binds with hydroxyl to form the intermediate HSCO2,and then the activated-OH on the oxygen vacancy reacts with HSCO2 to form HCO3.Meanwhile,the catalyst exhibits high catalytic stability because copper species(Cu+/Cu2+)redox cycle mitigate the sulfation of Co3O4(Co2+/Co3+).Our work offers a promising approach for the rational design of cobalt-related catalysts in the highly efficient hydrolysis COS process.
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| GB/T 7714 | Guanyu Mu , Yan Zeng , Yong Zheng et al. Oxygen vacancy defects engineering on Cu-doped Co3O4 for promoting effective COS hydrolysis [J]. | 绿色能源与环境（英文版） , 2023 , 8 (3) : 831-841 . |
| MLA | Guanyu Mu et al. "Oxygen vacancy defects engineering on Cu-doped Co3O4 for promoting effective COS hydrolysis" . | 绿色能源与环境（英文版） 8 . 3 (2023) : 831-841 . |
| APA | Guanyu Mu , Yan Zeng , Yong Zheng , Yanning Cao , Fujian Liu , Shijing Liang et al. Oxygen vacancy defects engineering on Cu-doped Co3O4 for promoting effective COS hydrolysis . | 绿色能源与环境（英文版） , 2023 , 8 (3) , 831-841 . |
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