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学者姓名：崔勍焱
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Abstract ：
We report a facile yet effective strategy to prepare hierarchical Beta zeolite with high molecular transport effectivity in catalysis. Alkaline etching involves preferential desilication from Beta framework and collapse of microporosity. The preferential desilication from outer rim of Beta stacking faults enlarged intercrystallite mesopores, while the collapse of microporosity created cylindroid-like intracrystalline mesopore. Part of Altet with lower stability was removed during alkaline etching, leading to a decrease in acid sites density. Alkaline etching of Beta zeolite with 0.2 mol/L NaOH solution greatly improved n -hexane isomerization activity over Ptbased catalysts. The maximum yield of isohexane and dibranched isomers increased by 6.2 % and 38.6 %, respectively. The enlargement of intercrystallite mesopores and the generation of intracrystalline mesopores of Beta zeolite lowered apparent activation energy of reaction. The apparent diffusivities measurements further revealed that Pt/Beta-0.2 M showed much lower transport limitation than Pt/Beta-parent. Our findings provide a promising catalyst for industrial alkane isomerization.
Keyword ：
Alkaline etching Alkaline etching Alkane isomerization Alkane isomerization Dibranched isomers Dibranched isomers Diffusion barrier Diffusion barrier Mesoporous Beta zeolite Mesoporous Beta zeolite
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| GB/T 7714 | Wang, Pengzhao , Chen, Tingting , Qiu, Zihui et al. Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers [J]. | FUEL , 2024 , 368 . |
| MLA | Wang, Pengzhao et al. "Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers" . | FUEL 368 (2024) . |
| APA | Wang, Pengzhao , Chen, Tingting , Qiu, Zihui , Yao, Wenjun , Liu, Pengpeng , Zhang, Yongze et al. Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers . | FUEL , 2024 , 368 . |
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The development of sustainable techniques to produce high-performance zeolite is essential to achieve green production in industry. Herein, we report an eco-friendly route to synthesizing hierarchical Beta zeolite from kaolinite and recycled mother liquor. The results reveal that the unutilized species (such as silicon species and Na+) in mother liquor stayed in a stable concentration during eleven recycled experiments. Moreover, the synthesized Beta zeolites still have comparable physicochemical properties and catalytic performance in the esterification of levulinic acid with ethanol over the initial zeolite although eleven recycled experiments. Life cycle assessment exhibits that the synthesis of Beta zeolite with recycled mother liquor can reduce global warming potential by 23% and resource depletion-water use by 36% compared to that without recycled mother liquor. This quantitatively demonstrates that the approach proposed in this work is really a sustainable one, extremely increasing the utilization efficiency of raw materials and decreasing the environmental burden. © 2024 Institute of Process Engineering, Chinese Academy of Sciences.
Keyword ：
Eco-friendly synthesis Eco-friendly synthesis Hierarchical Beta zeolite Hierarchical Beta zeolite Life cycle assessment Life cycle assessment Recycled mother liquor Recycled mother liquor
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| GB/T 7714 | Xiao, G. , Chen, X. , Li, T. et al. Eco-friendly synthesis and environmental impact assessment of hierarchical Beta zeolite from kaolinite and recycled mother liquor [J]. | Green Chemical Engineering , 2024 , 5 (4) : 501-510 . |
| MLA | Xiao, G. et al. "Eco-friendly synthesis and environmental impact assessment of hierarchical Beta zeolite from kaolinite and recycled mother liquor" . | Green Chemical Engineering 5 . 4 (2024) : 501-510 . |
| APA | Xiao, G. , Chen, X. , Li, T. , Wang, C. , Cui, Q. , Yue, Y. . Eco-friendly synthesis and environmental impact assessment of hierarchical Beta zeolite from kaolinite and recycled mother liquor . | Green Chemical Engineering , 2024 , 5 (4) , 501-510 . |
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Synthesizing zeolites, which are important materials used in the petroleum and chemical industries, from natural aluminosilicate minerals has been qualitatively recognized as a greener approach compared to that from traditional Si- and Al-containing chemicals; however, studies on the quantitative environmental impacts are still lacking. Herein, life cycle assessment (LCA) and green metrics (atom economy and environmental factor) were employed to comparatively assess the life cycle environmental impacts of zeolites synthesized from chemicals and natural minerals at the industrial scale. The values of seven LCA impact categories and sensitivity analysis between them were thoroughly compared. The results showed that, for each category, the synthesis from natural minerals has lower environmental impacts to varying degrees than that from chemicals. Further efficiency analysis of zeolite manufacturing technologies by green metrics indicated that the synthesis from natural minerals outperforms that from chemicals in terms of the resource utilization rate. The quantitative results indicate that significant benefits stem from the replacement of raw materials from chemicals to natural minerals. This work may provide a basis for the future selection and upgrade of zeolite production processes. Life cycle assessment and green metrics were used to comparatively assess the synthesis of zeolites from natural minerals and chemicals in which the former exhibits a better balance between efficiency and environmental impacts than the latter.
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| GB/T 7714 | Chen, Xiaoling , Xiao, Guoxi , Li, Tiesen et al. Comparative environmental assessment of zeolites synthesized from chemicals and natural minerals [J]. | GREEN CHEMISTRY , 2024 , 26 (9) : 5273-5283 . |
| MLA | Chen, Xiaoling et al. "Comparative environmental assessment of zeolites synthesized from chemicals and natural minerals" . | GREEN CHEMISTRY 26 . 9 (2024) : 5273-5283 . |
| APA | Chen, Xiaoling , Xiao, Guoxi , Li, Tiesen , Wang, Chan , Cui, Qingyan , Bao, Xiaojun et al. Comparative environmental assessment of zeolites synthesized from chemicals and natural minerals . | GREEN CHEMISTRY , 2024 , 26 (9) , 5273-5283 . |
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A seed-directed approach to synthesizing FeZSM-22 zeolite without organic structure directing agent (OSDA) was developed by using Fe-rich diatomite as all aluminum and iron sources. The FeZSM-22 zeolite with optimal crystallinity and purity can be obtained by systematically adjusting feed composition and synthesis conditions. Characterizations show that FeZSM-22 zeolite synthesized with OSDA-free owns high crystallinity, obvious thin needle-shaped morphology and high Bronsted/Lewis acid ratio. Significantly, when used for n-octane hydroisomerization reaction, its derived catalyst exhibits the best catalytic performance reflected by the highest selectivity to C-8 isomers compared to the two reference catalysts prepared based on a Fe-containing and a Fe-free ZSM-22 synthesized through an OSDA-directed route from natural diatomite and conventional chemicals, respectively. This work provides an alternative route to sustainably synthesizing heteroatomic zeolites with high performance. (c) 2023 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
Keyword ：
FeZSM-22 zeolite FeZSM-22 zeolite Natural minerals Natural minerals n-octane hydroisomerization n-octane hydroisomerization OSDA-free synthesis OSDA-free synthesis
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| GB/T 7714 | Li, Tiesen , Chen, Ting , Ye, Yinghui et al. OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization [J]. | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2024 , 66 : 51-59 . |
| MLA | Li, Tiesen et al. "OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization" . | CHINESE JOURNAL OF CHEMICAL ENGINEERING 66 (2024) : 51-59 . |
| APA | Li, Tiesen , Chen, Ting , Ye, Yinghui , Dong, Peng , Wang, Tinghai , Cui, Qingyan et al. OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization . | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2024 , 66 , 51-59 . |
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Carbon adsorbents have been widely used to remove indoor volatile organic compounds (VOCs), however, the proliferation of bacteria on the carbon adsorbents may deteriorate the indoor air quality and thus pose a serious threat to human health. Herein, we report the synthesis of antibacterial porous carbon spheres (carbonized aminophenol-formaldehyde resin, CAF) with well-dispersed Cu species via an in situ incorporation of Cu2+ during the polymerization of 3-aminophenol-formaldehyde resin followed by a thermal carbonization and reduction process. Compared with CAF, the Cu/CAF-x nanocomposites with Cu loading show a much higher specific surface area (>700 m2 g−1 vs. 569 m2 g−1 for CAF). In addition, the pore size of Cu/CAF-x is ranging from 0.7 to 1.68 nm, which is exactly conducive to adsorb the toluene molecules. As a result, the toluene adsorption capacity is improved from 123.50 mg g−1 for CAF to >170 mg g−1 for Cu/CAF-x. More importantly, such adsorbents possess excellent antibacterial performance, the Cu/CAF-10 (10 wt% of Cu loading) with a concentration of 50 μg mL−1 can completely kill the E. coli within 30 min. Our work paves the way to the development of bifunctional adsorbents with both efficient VOCs adsorption and excellent antibacterial performance. © 2023
Keyword ：
Adsorption Adsorption Air quality Air quality Carbonization Carbonization Copper compounds Copper compounds Escherichia coli Escherichia coli Formaldehyde Formaldehyde Health risks Health risks Indoor air pollution Indoor air pollution Pore size Pore size Porous materials Porous materials Toluene Toluene Volatile organic compounds Volatile organic compounds
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| GB/T 7714 | Zhang, Hongwei , Wu, Guanghui , Liu, Qunhong et al. Bifunctional Cu-incorporated carbon nanospheres via in-situ complexation strategy as efficient toluene adsorbents and antibacterial agents [J]. | Chemosphere , 2024 , 349 . |
| MLA | Zhang, Hongwei et al. "Bifunctional Cu-incorporated carbon nanospheres via in-situ complexation strategy as efficient toluene adsorbents and antibacterial agents" . | Chemosphere 349 (2024) . |
| APA | Zhang, Hongwei , Wu, Guanghui , Liu, Qunhong , Liu, Zhichen , Yang, Qin , Cui, Qingyan et al. Bifunctional Cu-incorporated carbon nanospheres via in-situ complexation strategy as efficient toluene adsorbents and antibacterial agents . | Chemosphere , 2024 , 349 . |
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Natural gas hydrates (NGH) as a potential energy resource gain much attention, the depressurization-assisted CH4/CO2 replacement is a combined method proposed recently for NGH mining. This work experimentally investigated the depressurization-assisted CH4/CO2 replacement behavior in the muddy-silt slurries, and the effect of depressurization moment, amplitude and frequency was systematically examined. The results revealed that the depressurization after replacement significantly promoted reaction within a short period. The CH4 replacement ratio was increased by delaying the depressurization moment and increasing the depressurization magnitude. The maximum CH4 replacement ratio reached 61.28% at the depressurization moment of 48 h and 274.15 K. Additionally, the CH4 replacement ratio was further increased in the secondary depressurization event compared to that at the primary depressurization. This research indicated that the depressurization was beneficial for CO2 sequestration when the replacement pressure is higher than CO2 hydrate equilibrium pressure. While it did not facilitate CO2 sequestration when the replacement pressure is close to CO2 hydrate equilibrium pressure. The free water consumption decreased with the increase of the depressurization moment, amplitude and frequency. These findings would contribute to the development of the depressurization-assisted CO2/CH4 replacement in the future. © 2024 Elsevier B.V.
Keyword ：
Carbon dioxide Carbon dioxide Energy resources Energy resources Gas hydrates Gas hydrates Hydration Hydration Mining Mining Potential energy Potential energy Silt Silt
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| GB/T 7714 | Mu, Liang , Zhao, Huixing , Li, Xianlong et al. Experimental investigation on the depressurization-assisted CH4/CO2 replacement behavior in the muddy silt slurries [J]. | Gas Science and Engineering , 2024 , 126 . |
| MLA | Mu, Liang et al. "Experimental investigation on the depressurization-assisted CH4/CO2 replacement behavior in the muddy silt slurries" . | Gas Science and Engineering 126 (2024) . |
| APA | Mu, Liang , Zhao, Huixing , Li, Xianlong , Zeng, Jiguang , Cui, Qingyan . Experimental investigation on the depressurization-assisted CH4/CO2 replacement behavior in the muddy silt slurries . | Gas Science and Engineering , 2024 , 126 . |
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Although the hydrate-based coal bed gas (CBG) separations have been investigated, the obtained CH4 recovery ratios were not quite satisfactory. To further improve CH4 extraction, this study developed a high-efficiency CBG recovery method via hydrate formation in emulsions facilitated by an excellent anti-agglomerant. Thermodynamic promoters were introduced to lower operating pressure and the hydrate equilibrium conditions were determined. Then the effect of water-cut (40-100 vol%), initial pressure, experimental temperature, stirring rate and feed gas composition was investigated. The CH4 concentration in equilibrium gas first decreased then increased as the water-cut increased. Specifically, it decreased from 30.16 mol% to 8.23 mol% in the 60 vol% water-cut emulsions and CH4 recovery reached 88.02 % at 274.15 K and an initial pressure of 3.0 MPa, marking the highest CH4 recovery achieved in CBG separation thus far. The CH4 recovery was increased at low temperature while decreased at high pressure conditions. After a second-stage separation, the CH4 concentration in equilibrium gas decreased to 1.64 mol% from 30.16 mol%, signifying a remarkable 94.56 % recovery of CH4 from feed gas. The CH4 contents after a three-stage enrichment exceeded 87 mol%. This study furnishes valuable insights for CH4 recovery from CBG utilizing hydrate-based separation technology.
Keyword ：
Coal bed gas Coal bed gas Emulsion Emulsion Hydrate Hydrate Methane recovery Methane recovery Separation Separation
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| GB/T 7714 | Mu, Liang , Zhou, Ziqi , Zhao, Huixing et al. High-efficiency recovery of methane from coal bed gas via hydrate formation in emulsions [J]. | ENERGY , 2024 , 290 . |
| MLA | Mu, Liang et al. "High-efficiency recovery of methane from coal bed gas via hydrate formation in emulsions" . | ENERGY 290 (2024) . |
| APA | Mu, Liang , Zhou, Ziqi , Zhao, Huixing , Zhu, Xiaohai , Cui, Qingyan . High-efficiency recovery of methane from coal bed gas via hydrate formation in emulsions . | ENERGY , 2024 , 290 . |
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To gain a profound understanding of the reaction pathway and the controlling step of residue oil slurry-phase hydrocracking over Fe2O3 catalyst, a six-lumped kinetic model was proposed and employed to acquire the kinetic rate constants based on each fraction yield obtained at 400 to 420 °C under initial H2 pressures of 8 to 10 MPa for 1 to 3 h. The optimal kinetic rate constant for each step of vacuum residue (VR) conversion process was determined via Levenberg-Marquardt algorithm and the sum of squares error (SSE). The results reveal that VR converted into naphtha and diesel is dominant according to their kinetic rate constants, followed by the conversion of vacuum gas oil (VGO) to diesel, diesel to naphtha, and diesel to gas. Furthermore, the sensitivity analysis confirms a strong agreement between the predicted and experimental values. The combination of kinetic rate constants and activation energy illustrates that the gas product primarily originates from naphtha. Additionally, the higher H2 pressure effectively mitigates coke deposition by restricting the aggregation of polycyclic aromatics, as evidenced by the increase in the reaction activation energy for the conversion of VR to coke and the analysis of the used catalyst. © 2024 Elsevier Ltd
Keyword ：
Activation analysis Activation analysis Activation energy Activation energy Catalysts Catalysts Coke Coke Hematite Hematite Hydrocracking Hydrocracking Kinetic parameters Kinetic parameters Kinetic theory Kinetic theory Naphthas Naphthas Rate constants Rate constants Sensitivity analysis Sensitivity analysis
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| GB/T 7714 | Cui, Qingyan , Zheng, Bin , Wang, Boshi et al. Kinetics study on residue oil slurry-phase hydrocracking with Fe2O3 catalyst [J]. | Fuel , 2024 , 374 . |
| MLA | Cui, Qingyan et al. "Kinetics study on residue oil slurry-phase hydrocracking with Fe2O3 catalyst" . | Fuel 374 (2024) . |
| APA | Cui, Qingyan , Zheng, Bin , Wang, Boshi , Yan, Jianteng , Liu, Jiangyong , Li, Tiesen et al. Kinetics study on residue oil slurry-phase hydrocracking with Fe2O3 catalyst . | Fuel , 2024 , 374 . |
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A seed-directed approach to synthesizing FeZSM-22 zeolite without organic structure directing agent(OSDA)was developed by using Fe-rich diatomite as all aluminum and iron sources.The FeZSM-22 zeolite with optimal crystallinity and purity can be obtained by systematically adjusting feed composi-tion and synthesis conditions.Characterizations show that FeZSM-22 zeolite synthesized with OSDA-free owns high crystallinity,obvious thin needle-shaped morphology and high Bronsted/Lewis acid ratio.Significantly,when used for n-octane hydroisomerization reaction,its derived catalyst exhibits the best catalytic performance reflected by the highest selectivity to C8 isomers compared to the two reference catalysts prepared based on a Fe-containing and a Fe-free ZSM-22 synthesized through an OSDA-directed route from natural diatomite and conventional chemicals,respectively.This work provides an alternative route to sustainably synthesizing heteroatomic zeolites with high performance.
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| GB/T 7714 | Tiesen Li , Ting Chen , Yinghui Ye et al. OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization [J]. | 中国化学工程学报（英文版） , 2024 , 66 (2) : 51-59 . |
| MLA | Tiesen Li et al. "OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization" . | 中国化学工程学报（英文版） 66 . 2 (2024) : 51-59 . |
| APA | Tiesen Li , Ting Chen , Yinghui Ye , Peng Dong , Tinghai Wang , Qingyan Cui et al. OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization . | 中国化学工程学报（英文版） , 2024 , 66 (2) , 51-59 . |
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FAU型分子筛因其独特的孔道结构已成为化学工业中应用最广泛、用量最大的催化剂、催化剂载体及吸附剂之一.然而, FAU型分子筛单一的微孔孔道限制了客体分子的扩散,导致其性能严重下降.相比之下,等级孔FAU型分子筛具有微-介/大孔复合的多级孔道结构,能够促进大分子的扩散、提高活性位点的可接近性,进而改善其吸附和催化性能.目前,等级孔分子筛的制备方法主要包括“自下而上”的直接合成法和“自上而下”的后处理法.本文主要介绍了近年来等级孔X型和Y型分子筛制备方法的研究现状,重点总结了等级孔X型和Y型分子筛在吸附、催化等过程中的应用性能,并对等级孔FAU型分子筛的绿色化制备进行展望.
Keyword ：
催化 催化 后处理 后处理 吸附 吸附 直接合成 直接合成 等级孔FAU型分子筛 等级孔FAU型分子筛
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| GB/T 7714 | 董鹏 , 朱琳 , 骆龙华 et al. 等级孔FAU型分子筛的制备及应用的研究进展 [J]. | 科学通报 , 2024 , 69 (19) : 2718-2728 . |
| MLA | 董鹏 et al. "等级孔FAU型分子筛的制备及应用的研究进展" . | 科学通报 69 . 19 (2024) : 2718-2728 . |
| APA | 董鹏 , 朱琳 , 骆龙华 , 李铁森 , 王廷海 , 王婵 et al. 等级孔FAU型分子筛的制备及应用的研究进展 . | 科学通报 , 2024 , 69 (19) , 2718-2728 . |
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