MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jiayuan Wang,Mingquan Li,Yajie Fu,Cederick Cyril Amoo,Yujia Jiang,Ruiqin Yang,Xu Sun,Chuang Xing,Elton Maturura
Zeolites are vital industrial materials applied widely in the field of heterogeneous catalysis . Porous zeolites are essentially synthesized in the presence of soft or hard templates in processes such as hydrothermal, solvothermal, and ionothermal synthesis. Herein, we demonstrated a facile ambient pressure technique to synthesize NaY zeolite using a glass tube as a reactor and a fluid sealant to create a physical barrier between the reactor contents and the atmosphere. The synthesized zeolite Y was characterized by XRD , SEM, TEM , UV-Raman, N 2 sorption , MAS NMR, and XRF spectroscopy . In comparison to the traditional hydrothermal synthesis routes, the avoidance of high-pressure synthesis apparatus not only reduces safety risks but also significantly improves the yield of zeolite products with a crystallinity of 52% and Si/Al = 3.51. Furthermore, the process is leaner, efficient, and reduces costs. Optimum conditions realized for the synthesis of highly crystalline zeolite Y were 90 °C and 18 h crystallization temperature and period respectively, using 1-dodecanol as a sealant. Subsequently, PEG6000 emerged the best among organic templates investigated to improve porosity while maintaining high crystallinity of the zeolite.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2015
·
IF 3.352
Hui-Ying Sun,Lin-Ping Sun,Fei Li,Long Zhang
The adsorption of benzothiophene from fuels on NaY zeolites modified with 0.09 M NaOH aqueous solution was investigated. The sulfur removal reached to 99.9%, and the adsorption capacity was 1.65 mg benzothiophene/g of the modified adsorbent. The results of the scanning electron microscopy, X-ray diffraction, X-ray fluorescence, and N 2 adsorption–desorption isotherms analyses show that mesopores appeared on the surface of NaY-0.09 adsorbent and the intrinsic crystallinity was preserved after the modification. Py-IR and NH 3 -TPD analyses indicated that the adsorption of benzothiophene occurred on the weak Lewis acid sites on the adsorbent. Both an increase in the number of the weak Lewis acid sites and the formation of mesopores on NaY-0.09 adsorbent improved its desulfurization activity.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Mengjiao Yu,Xiong-Fei Zhang,Siting Yang,Jianfeng Yao
Adsorptive desulfurization represents a promising approach for ultra-deep desulfurization. In this work, NaY zeolite was successfully integrated into a biodegradable alginate matrix, forming composite beads that demonstrated improved adsorption capacity and favorable reusability. The composite beads have been utilized as adsorbents for the purpose of removing sulfur compounds (thiophene, TP) from model fuel. At room temperature (25 °C), the optimum 1NaY/CA beads presented a maximum adsorption capacity of 51.4 mgS/g for TP. The superior accessibility of the adsorption sites within the 1NaY/CA beads, primarily attributed to the porous structure of NaY and the abundant functional groups of sodium alginate, contributed to the improved adsorptive desulfurization performance. The adsorption process followed pseudo-second-order kinetics, and the overall process was an exothermic reaction that was spontaneous and feasible. The 1NaY/CA beads demonstrated remarkable stability and reusability, with the efficiency decreasing by a mere 7.2 % after six cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mei Jiang,Lin Zhu,Qian Zhao,Guangyuan Chen,Zeru Wang,Jingjing Zhang,Ling Zhang,Jiehong Lei,Tao Duan
Effective capture of radioactive iodine in spent fuel reprocessing is an urgent problem to be solved. In this study, we reported a novel fluoride modified bismuth sulfide supported NaY zeolite material (NaY-NH 4 F-Bi 2 S 3 ), prepared by hydrothermal method. The zeolite with a hydrophobic skeleton was obtained by etching with NH 4 F solution. The adsorption mechanism generally follows preferential iodine enrichment in NaY zeolite microporous channels and is subsequently immobilized by loaded bismuth sulfide sites on NaY zeolite. Under the combination of physical and chemosorption, the sorption capacity of NaY-NH 4 F-Bi 2 S 3 reaches 491 mg/g, which is much higher than that of bare NaY zeolite. The excellent thermal stability and radiation stability greatly enhance its iodine capture performance under harsh conditions. The comprehensive characteristics of high cost-effectiveness, low toxicity, good radiation resistance, and good thermal stability make it have potential applications in the capture, immobilization and storage of radioactive gaseous iodine during spent fuel reprocessing.
研究领域:
核科学与工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Hua Qin,Tengfei Wu,Chuan Du,Li Ren,Lei Chen,Ding Weng,Jiadao Wang
Through a simple self-assembly method, the as-synthesized NaY/MnO 2 nanocomposites were uniformly distributed and immobilized on textile fibers, which make the nanocomposite suit for indoor formaldehyde (HCHO) removal. Compared with NaY-based textiles and MnO 2 -based textiles, the NaY/MnO 2 -based textiles using polyester (PET) as substrate exhibited superior HCHO removal activity and better stability at room temperature. Furthermore, for low-level indoor environment, HCHO removal efficiency of NaY/MnO 2 -based textiles was up to 90 % even after 30 cycles tests under the conditions of original HCHO concentration of 1 ppm. Therefore, the NaY/MnO 2 -based textiles highlighted new avenues to the practical use for low-level indoor HCHO removal.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Xu Gao,Aihu Feng,Le Mi,Yang Yu,Yun Yu
Adsorption is one of the most effective methods for controlling the concentration of VOCs pollution. In this work, the hierarchical NaY zeolites with size-controlled mesopores in the range of 2–5 nm are obtained via NH 4 HF 2 -etching and surfactant-templating process. By using the different cationic surfactant (C n TAB), we fabricate the surfactant-templated zeolite with controllable mesopores, and improve its adsorption capacity for toluene. In addition, the modified zeolite’s hydrophobicity is enhanced, and it maintains a high adsorption capacity in a complex humid environment.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2017
·Vol. 22
·期 2
·305
·
IF 2.861
Jingwei Rui,Fei Liu,Rijie Wang,Yanfei Lu,Xiaoxia Yang
A series of Zn-modified NaY zeolites were prepared by the liquid-phase ion-exchange method with different Zn sources, including Zn(NO3)2, Zn(Ac)2and ZnSO4. The samples were tested as adsorbents for removing an organic sulfur compound from a model gasoline fuel containing 1000 ppmw sulfur. Zn(Ac)2-Y exhibited the best performance for the desulfurization of gasoline at ambient conditions. Combined with the adsorbents’ characterization results, the higher adsorption capacity of Zn(Ac)2-Y is associated with a higher ion-exchange degree. Further, the results demonstrated that the addition of 5 wt % toluene or 1-hexene to the diluted thiophene (TP) solution in cyclohexane caused a large decrease in the removal of TP from the model gasoline fuel. This provides evidence about the competition through the π-complexation between TP and toluene for adsorption on the active sites. The acid-catalyzed alkylation by 1-hexene of TP and the generated complex mixture of bulky alkylthiophenes would adsorb on the surface active sites of the adsorbent and block the pores. The regenerated Zn(Ac)2-Y adsorbent afforded 84.42% and 66.10% of the initial adsorption capacity after the first two regeneration cycles.Keywords:Zeolite;Zinc sources;adsorption;desulfurization;ion exchange
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Shixiong Tang,Fang Li,Jidong Liu,Bao Guo,Zenan Tian,Jianhua Lv
The treatment and reuse of polyester wastes have received widespread attention. In this work, MgO/NaY catalysts with different MgO contents were prepared by the incipient-wetness impregnation method and used in the methanolysis of PET for the first time, proposing a convenient and feasible method to solve the plastic recycling crisis. To characterize the surface and structural properties of the prepared MgO/NaY catalysts by EDXRF, BET, XRD, SEM, FT-IR and TEM. The acid-base properties of the catalysts were also characterized by CO 2 -TPD and NH 3 -TPD. The relationship between acid-base and catalytic activity showed that the conversion of PET and the yield of DMT increased with the increase of alkalinity of the catalyst. The results showed that the PET conversion and the DMT yield could reach 99% and 91%, respectively, under the reaction conditions of 200 °C, 30 min, catalyst dosage of 4 wt%, and the mass ratio of methanol to PET of 6 with 21%MgO/NaY as the catalyst. The recyclability of the catalyst was investigated, and the 21%MgO/NaY catalyst still had excellent catalytic activity for the methanolysis of PET after 6 cycles.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Ke Huang,Shicheng Yuan,Rongyan Mei,Ge Yang,Peng Bai,Hailing Guo,Chunzheng Wang,Svetlana Mintova
A chlorine-free catalyst consisting of zeolite Y modified with Pd (Pd/NaY) catalyst has been prepared and used in the indirect oxidative carbonylation of methanol to dimethyl carbonate (DMC). The activity and stability of the catalyst were further improved by introducing molybdenum into Pd/NaY using a top-down approach (Pd-Mo/NaY catalyst). The Pd-Mo/NaY catalyst exhibited higher stability compared to the Pd/NaY. A high CO conversion of 97% and DMC selectivity of 80% during a 30-hour catalytic test for the Pd-Mo/NaY were obtained. Furthermore, the incorporation of Mo was found to partially heal the silanols and hinder the aggregation of Pd in the Pd-Mo/NaY catalyst. The interactions between Mo and Pd increased the amount of active Pd 2+ species and enhanced the adsorption of CO reactant on the Pd-Mo/NaY catalyst. The key reaction intermediate of COOCH 3 * was captured by in situ diffuse reflectance infrared Fourier transform spectroscopy . The stabilization of active Pd 2+ species contributed to the enhanced catalytic activity of the Pd-Mo/NaY catalyst in the indirect oxidative carbonylation of methanol to DMC reaction.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 15
·1-12
·
IF 2.8
Li Meiling,Cao Yongze,Cheng Lihong,Fan Yuhan,Wang Yichao,Li Xiangping,Zhang Xizhen,Chen Baojiu
A series of Er 3+ /Yb 3+ co-doped NaY(WO 4 ) 2 (NYWO) phosphors are prepared by molten salt synthesis (MSS) with Na 2 SO 4 as solvent. The holding temperature, holding time, and solvent-to-solute mass ratio parameters are regulated. The structure, morphology, and luminescence properties of the samples were tested by XRD, SEM, and fluorescence spectrometers, respectively. The lamellar sample is prepared at 900℃ for 5 h when solvent-to-solute is 3, which has the highest pure green upconversion luminescence (UCL) intensity under 980 nm laser excitation. It is demonstrated that the UCL intensity of the samples prepared by MSS is higher than that of solid sintered samples. The maximum absolute sensitivity (S A ) and relative sensitivity (S R ) are 0.012184 K⁻ 1 at 507 K and 0.01102 K⁻ 1 at 303 K, respectively. These materials can be used for pure green luminescence displays and temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 7
·1-11
·
IF 1.604
Yao Hanyu,Shen Honglie,Tang Quntao,Yang Nannan,Zhai Zihao,Li Yufang
NaY(WO 4 ) 2 : Er 3+ phosphors with various doping concentrations of [Er 3+ ]/([Er 3+ ]+[Y 3+ ]) (0, 5, 7, 10, 12, 15%) were successfully synthesized by high-temperature solid-state reaction. X-ray diffraction (XRD) measurement demonstrated the presence of tetragonal-phase NaY(WO 4 ) 2 phosphors and Fourier transform infrared (FT-IR) spectra showed a strong υ 3 stretching vibration mode of WO 4 2− , indicating the good crystallization of the phosphors. Well-crystallized phosphors showed a fine morphology with particle sizes of 0.8–10 µm by scanning electron microscope (SEM). Under excitation of 980 nm laser, Er 3+ -doped phosphors exhibited strong green emissions centered at 527 and 549 nm in addition to a 665 nm emission band in the red region, which were assigned to the 2 H 11/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions, respectively. When the doping concentration was 10%, the intensities of green and red emissions reached their maximum values, stronger than that in 5% Er 3+ doped one by 13 times. The double-logarithm plot of the upconversion (UC) emission intensity to the excitation power for different Er 3+ doping concentrations depicted that at least two infrared photons were involved for every emitted green and red photon. UC emission intensity changing with temperature displayed different trends for the phosphors with different Er 3+ concentrations. The enhancement for green emission band centered on 549 nm could reach 50 times at 30 K in sample with 5% Er 3+ concentration. Under excitation by 355 nm laser, all the phosphors showed a strong PL emission band at 430 nm, while green luminescence band locating from 540 to 570 nm was only observed in 7, 10, and 12% Er 3+ -doped phosphors, which was ascribed to 4 S 3/2 → 4 I 15/2 transition.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Aihu Feng,Jieyan Dai,Xu Gao,Yun Yu
Surfactant-templating strategy is an effective method to construct the hierarchical zeolite with controllable mesopores. In this work, the hierarchical NaY zeolites with the mesoporous size of ∼ 2.6 nm and ∼ 3.5 nm are obtained via the chemical etching and surfactant-templating process, and the formation mechanism of mesopores with controllable pore size is elucidated. The saturated adsorption capacity of toluene for H 2 C 2 O 4 -etched NaY-C10 and NH 4 HF 2 -etched NaY-C16 is 208 mg·g −1 and 215 mg·g −1 , respectively. A new type of hierarchical NaY zeolite with excellent toluene adsorption properties is developed.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）