CHEMICAL PHYSICS LETTERS
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2024
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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
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
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IF 10.8
Yibing Xie,Xueqian Wang,Zan Qu,Ping Ning,Langlang Wang,Haomiao Xu,Wenjun Huang,Jichang Lu,Jianfei Luo
The transformation of toxic arsine (AsH3) gas into valuable elemental arsenic (As0) from industrial exhaust gases is important for achieving sustainable development goals. Although advanced arsenic removal catalysts can improve the removal efficiency of AsH3, toxic arsenic oxides generated during this process have not received adequate attention. In light of this, a novel approach for obtaining stable As0 products was proposed by performing controlled moderate oxidation. We designed a tailored Ni-based catalyst through an acid etching approach to alter interactions between Ni and NaY. As a result, the 1Ni/NaY-H catalyst yielded an unprecedented proportion of As0 as the major product (65%), which is superior to those of other reported catalysts that only produced arsenic oxides. Density functional theory calculations clarified that Ni species changed the electronic structure of oxygen atoms, and the formed [NiIII–OH (μ-O)] active centers facilitated the adsorption of AsH2*, AsH*, and As* reaction intermediates for As–H bond cleavage, thereby decreasing the direct reactivity of oxygen with the arsenic intermediates. This work presents pioneering insights into inhibiting excessive oxidation during AsH3 removal, demonstrating potential environmental applications for recovery of As0 from toxic AsH3.
研究领域:
环境科学
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催化化学
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材料科学
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DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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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
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催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Juntao Tang,Mengying Fu,Yidan Mao,Shuyi Yang,Wei Lin,Yan Yu,Shuang Song
Photocatalysis is regarded as a promising in situ air purification technology for the removal of volatile organic compounds. However, the deactivation of photocatalysts remains a serious issue that needs to be addressed. Herein, we report a novel dual-functional photocatalyst (TiO 2 @HYZ) with spatially separated catalytic sites and adsorption sites, which has been obtained by combining hydrophilic {0 0 1} TiO 2 nanosheets with hydrophobic NaY zeolite. TiO 2 @HYZ showed excellent photocatalytic activity for the degradation of gaseous toluene under UV irradiation in humid air. The optimized TiO 2 @HYZ-2 (containing 45.7 wt% TiO 2 ) achieved 96.6% toluene removal and 87.4% mineralization within 120 min. The specific reaction rate constant of TiO 2 @HYZ-2, pristine TiO 2 and P25 normalized by the unit amount of TiO 2 during the photocatalytic degradation process were calculated to be 0.481, 0.230 and 0.250 min −1 g −1 , respectively. Moreover, TiO 2 @HYZ-2 showed superior durability, maintaining stable performance over repeated toluene degradation processes, even at high toluene concentration, whereas pristine TiO 2 incurred severe deactivation with increasing number of photocatalysis cycles. The significantly enhanced activity and anti-deactivation property was attributed to a synergistic effect between HYZ and TiO 2 in the catalyst structure, which strengthened the adsorption of toluene on HYZ and facilitated effective separation of photoexcited charge carriers on TiO 2 , thus avoiding the deposition of degradation intermediates on the active sites and simultaneously improving mineralization. This work provided a new perspective for the design of efficient and deactivation-resistant photocatalysts for air pollution remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2019
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IF 3.206
Chi Chen,Zhuang Fu,Weiying Zhou,Qiushi Chen,Chenzhao Wang,Lu Xu,Zhibing Wang,Hanqi Zhang
The ionic liquid-immobilized NaY zeolite was prepared by means of impregnation approach and used as the dispersant of matrix solid phase dispersion for the extraction of aloe-emodin, emodin, chrysophanol and physcion in Rheum palmatum L.. High performance liquid chromatography coupled with diode-array detection was used for the separation and determination of target analytes. The ionic liquid-immobilized NaY zeolite was further characterized by SEM, FT-IR, TG, XRD and BET. The experimental parameters, such as type and content of ionic liquid, mass ratio of sample to dispersant, type of washing solvent, and type and volume of elution solvent, were optimized. The results revealed that the prepared ionic liquid-immobilized NaY zeolite presents suitable properties and can be used as the dispersant of matrix solid phase dispersion for the extraction of anthraquinones. Good linearities ( r > 0.9995) were obtained in the range of analyte concentration investigated. The recoveries were 73–98% with the relative standard deviations lower than 6%. Compared with ultrasound-assisted extraction and heat reflux extraction, the present method requires less sample, organic solvent and extraction time. The present method can be applied to the determination of anthraquinones from medicinal plant.
研究领域:
分析化学
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药学
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2019
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IF 6.864
Xianghua Wu,Xing Yang,Hu Yang,Zeping Guo,Jinpei Lin,Wei Wu,Xiaoguang Liang,Yun He
Composite fibers synthesized via the electrospinning technique have been extensively investigated as the adsorbent for the volatile organic compounds (VOCs) because of their synergistic effect . Herein, the novel hierarchically structured polyvinylpyrrolidone (PVP) porous fibers embedded with microporous NaY zeolite are fabricated by employing the electrospinning method . The parameters such as the electrospinning voltage and flow rate as well as the particle sizes of NaY zeolite are optimized further for the preparation of composite fibers featured with homogeneous morphology and superior property. Consequently, the composite fibers with large specific area synthesized under the optimized process present an excellent benzene adsorption capacity of 667 mg/g, which can be attributed to synergistic effect originated from the hierarchical structure configured with porous PVP and microporous NaY zeolite. Our work does not only demonstrate the promising potential of the as-fabricated composite fibers for VOCs due to its advantages of low cost and large-scale production, but also provides valuable insights into the design and utilization of zeolite/polymer composite fibers for practical applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2022
·Vol. 9
·期 10
·2182-2193
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IF 7.779
Peng Liu,Tian Xia,Suofu Nie,Qiaoxia Guo,Chunming Xu,Baojian Shen
Y zeolite is presently used as an important active component in oil refining catalysts. The efficient synthesis of NaY zeolite still faces many huge challenges. Herein, a novel method for the rapid synthesis of nano-plate-like small crystal-sized NaY zeolite through an artificial-fish-reef-breeding negative crystal strategy is reported. It was discovered that cationic polyacrylamide (CPAM) could act as an artificial fish-reef to breed negative crystals, which promoted NaY zeolite nucleation and accelerated the crystallization of NaY zeolite. The crystallization time of NaY zeolite was shortened by 9 h. The relevant crystallization mechanism was investigated. Nano-plate-like (10–50 nm) small-sized (100–200 nm) NaY zeolite crystals with exceptional thermal stability and a large total volume (0.447 cm3 g−1) were synthesized. After steam treatment, the nano-plate-like small-sized USY-CPAM zeolites possessed reasonable acid sites distribution, endowing them with superior cracking activity for heavy reactant molecules.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
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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
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Aihu Feng,Le Mi,Yang Yu,Yunzhen Cao,Yun Yu,Lixin Song
Volatile organic compounds have seriously affected the natural environment and human health, and adsorption is one of the most effective method for controlling VOCs pollution. In this work, the NH 4 HF 2 -etched NaY-s-x zeolites with intracrystalline mesoporosity are obtained via the surfactant-templating process in weak base NH 4 OH solution. The morphology, microstructure, and toluene adsorption property of as-prepared hierarchical Y zeolites are systematically characterized. It is found that the structural and textural properties of NH 4 HF 2 -etched NaY samples are significantly changed by the simple surfactant-templated approach and the large-sized mesopores inside NH 4 HF 2 -etched NaY sample disappear to form the surfactant-templated mesoporosity with a size of ~4 nm. It is demonstrated that the intracrystalline mesoporosity obviously improves the toluene molecular adsorption properties of zeolite samples. Moreover, the mechanism of the surfactant-templating process is elucidated.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
FUEL
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2023
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IF 7.4
Siqi Wu,Rong Guo,Jianshan Chen,Runping Ye,Yeyan Qin,Hanying Wu,Shanshan Zong,Yang Liu,Yuangen Yao
Lack of high performance and stability catalysts remains a technical bottleneck for the industrialization of methyl nitrite (MN) carbonylation to dimethyl carbonate (DMC). Lewis acidity is crucial for catalytic performance in MN carbonylation reaction, but the regulation of Lewis acid sites and the effects of Lewis acid strength on catalytic performance have not been clarified. Thus, rational design of NaY zeolites with controllable acidity is an effective strategy to promote their catalytic performance. Herein, we substituted Ga for partial framework Al to produce a series of NaGaY-x (x = 0 ∼ 2) zeolites with different Ga content via direct hydrothermal method and applied in this reaction. The results showed that the Lewis acid strength increased upon an appropriate amount of Ga incorporation, thereby the electron density of Pd 2+ could be regulated. The optimal electron density of Pd 2+ promotes the carbon monoxide (CO) adsorption and activation, which contribute to the formation of the critical intermediate species *COOCH 3 . Eventually, the Ga-modified PdCu/NaY catalyst exhibited remarkable catalytic activity for MN carbonylation to DMC with the weight-time yields (WTY DMC ) of 1251 g·kg cat −1 ·h −1 , and the CO conversion to DMC (C CO ) of 69.2 % as well as the DMC selectivity based on CO (S DMC/CO ) up to 100 %. Our work paves the way to further understand the synergistic effect between Pd 2+ and Lewis acid, assists in the development of high-performance MN carbonylation catalysts.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
MOLECULES
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2017
·Vol. 22
·期 2
·305
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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
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产品关联
DOI
PubMed
高影响因子
HELVETICA CHIMICA ACTA
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2025
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IF 1.8
Sendaner Adelieti,Si-Qi Wu,Xian-Hao Wu,Rong Guo,Jian-Shan Chen,Zhi-Fang Diao,Zi-Yi Miao,Zhen-Hong Han,Ye-Yan Qin,Yuan-Gen Yao
The carbonylation of methyl nitrite (MN) to synthesize dimethyl carbonate (DMC) is a promising route, but the lack of efficient and stable catalysts remains a major challenge for large-scale applications. In this study, by adjusting the alkalinity of the initial gel, NaY zeolites with tunable acidity were synthesized, and the amount of Lewis acid sites was optimized. Appropriate amounts of Lewis acid sites facilitated the interaction between NaY zeolites and Pd species, which was beneficial for stabilizing the oxidation state of Pd and promoting CO adsorption and activation, thereby contributing to the formation of the key intermediate *COOCH3. The catalyst PdCu/NaY-1 (alkalinity in the initial gel Na2O = 9) exhibited significant improvement in catalytic performance for the synthesis of DMC, with the WTYDMC of 1604 g·kgcat-1·h-1, the conversion of CO to DMC (CCO) of 88.7%, and the DMC selectivity based on CO (SDMC/CO) up to 100%.
研究领域:
催化化学
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材料科学
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绿色化学
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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）