INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Qifan Yang,Haodong Xie,Xiang Ni,Li Liu,Yuan Xue,Yan Liu,Lei Wang,Hongjun Zhu
Adsorptive separation of C 2 H 2 from C 2 H 4 , which could deal with multi-steps for their similar kinetic diameter and physical properties, still poses a significant challenge. In this work, we prepared two metal cations (Co 2+ , Zn 2+ )-exchanged aluminosilicate FAU zeolites as an inorganic porous matrix, and grafted an organic zeolitic imidazole framework crystal layer to construct the inorganic–organic composites for gas separation process of C 2 H 4 among the mixed gas components. Such inorganic–organic porous composites can adsorb C 2 H 2 and hinder the large-sized C 2 H 4 . The Co-FAU@ZIF-8 composite was verified through breakthrough experiments and demonstrated a promising adsorptive volume of 1.46 mmol g −1 with an IAST selectivity of C 2 H 2 /C 2 H 4 of 5.6 at 298 K, respectively. Via powder X-ray diffraction crystallography and combined spectroscopy, we found that the exchanged metallic cation located at the accessible s 6 r , and served as the anchor point for the epitaxy of different crystals. Such tunable features ( i.e. , metallic centers and pore diameter) provide a potential pathway for the sub-sequential development of highly efficient adsorptive materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Chemistry-Switzerland
·
2025
·Vol. 7
·期 3
·90
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IF 2.4
Tianning Zheng,Ruihao Huang,Haoran Zhang,Song Ye,Deping Wang
Silver nanoclusters that are confined inside zeolites can give off intensive tunable emission across the visible region under UV excitation. In this research, a series of silver nanoclusters loaded with R-FAU/Ag (R = Li, Na, K) zeolites were synthesized and then applied as phosphors for LEDs. The XRD and SEM measurements showed the R-FAU/Ag (R = Li, Na, K) zeolites have high crystallinity and a size distribution of 0.7–1.25 μm. Under excitations of 310–330 nm ultraviolet radiation, Li-FAU/Ag, Na-FAU/Ag, and K-FAU/Ag exhibit monotonically declining emission intensities and red-shifted emissions with peak wavelengths of 520, 527, and 535 nm, respectively. By using silicone-based epoxy resin as the packaging material, a series of LEDs were fabricated by mixing R-FAU/Ag (R = Li, Na, K) phosphors. It is indicated that the Li-FAU/Ag-LED shows the strongest intensity of 94.9 mcd, much higher than that of the LEDs made from Na-FAU/Ag (63.7 mcd) and K-FAU/Ag (74.2 mcd) phosphors. Additionally, the chromaticity coordinate of the Li-FAU/Ag-LED is located at (0.2651, 0.4073) and has a high color temperature of 7873 K. Thermal test data showed that upon heating to 440 K, the intensities of R-FAU/Ag (R = Li, Na, K) LEDs decreased to 81%, 79%, and 75% of their initial intensities measured at 280 K, respectively. This research proposes a method for regulating the luminescent properties of silver nanoclusters in FAU zeolite by modifying the extra-framework cations and demonstrates excellent performance in LED products.
研究领域:
材料科学
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无机化学
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光学工程
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DOI
高影响因子
LUMINESCENCE
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2025
·Vol. 40
·期 5
·e70177
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IF 3
Ruihao Huang,Song Ye,Meiyan Wang,Ling Pan,Tianning Zheng,Deping Wang
The manipulation of silver nanoclusters' luminescence performance in heteroatom zeolite was rarely reported. In this research, the heteroatom Ga-FAU zeolites were synthesized together with the Al FAU zeolite, based on which a series of Ag nanoclusters loaded Al FAUAg and mGa FAUAg zeolites were prepared. The spectroscopy characterization indicated that emission intensity of silver nanoclusters is greatly enhanced in Ga-containing zeolites compared to that in Al FAUAg, and meanwhile, the excitation and emission peak showed redshift and blueshift, respectively, with the introduction and increasing proportion of Ga atoms in mGa FAUAg. The TD-DFT method was carried out on the [Ag 3 Ga x D6r] + (x = 0, 1, 2, 3, 4, 5) clusters to study the effect of framework Ga on the luminescence properties of Ag 3 + in the D6r cavity of FAU zeolite, which suggested that the S 1 → S 0 transition of Ag 3 + is responsible for the radiative visible emission. Moreover, the low-energy shift for S 3 → S 0 transition and high-energy shift for S 1 → S 0 transition were observed with increasing x value in [Ag 3 Ga x D6r] + clusters, which is in accordance with the experimental observation. This research provided an alternative method for the manipulation of silver nanoclusters' luminescence performance by using heteroatom zeolite, which contributed to the design of solid phosphors with desirable emission.
研究领域:
材料科学
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光化学
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计算化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 19
·9076-9080
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IF 8.867
Xin Xiong,Dingzhong Yuan,Qinming Wu,Fang Chen,Xiangju Meng,Ruihua Lv,Daniel Dai,Stefan Maurer,Robert McGuire,Mathias Feyen,Ulrich Müller,Weiping Zhang,Toshiyuki Yokoi,Xinhe Bao,Hermann Gies,Bernd Marler,Dirk E. De Vos,Ute Kolb,Ahmad Moini,Feng-Shou Xiao
High silica CHA zeolite plays an important role in selective catalytic reduction of NOx with NH3 (NH3-SCR), but its synthesis is not highly efficient due to the use of a relatively high-cost structural directing agent (SDA) N,N,N-trimethyl-adamantammonium hydroxide (TMAdaOH) and relatively long crystallization time under hydrothermal conditions. Herein, we report an efficient and rapid synthesis of a high silica CHA zeolite possessing good crystallinity and uniform crystals (CHA-ST). The method includes interzeolite transformation of high silica FAU zeolite in the absence of water but the presence of zeolite seeds and a bromide form of the SDA. The absence of water in the synthesis significantly improves the zeolite yield by avoiding dissolution of aluminosilicate species in aqueous media, while the addition of zeolite seeds remarkably enhances the crystallization rate under solvent-free conditions. In addition, this route allows the use of a low-cost bromide form of the SDA. Catalytic tests in the NH3-SCR show that copper-exchanged CHA-ST (Cu-CHA-ST) exhibits comparable catalytic properties to those of Cu-SSZ-13 obtained from the conventional hydrothermal route.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Xiaotao Yu,Yuxuan Chen,Yinying Jin,Min Guo,Song Lu,Jiadi Ying,Tiancun Liu,Qi Shen,Yeqing Wang,Zhixin Yu
The synthesis of zeolite at a mild temperature without the use of solvents presents a significant and ongoing challenge within industrial applications. In this work, we describe an approach to the solvent-free synthesis of FAU zeolite at 50 °C, achieving high crystalline yields and forming small crystal sizes ranging from approximately 30 to 100 nm. A study by CO2 isotherms at 273 K demonstrates that the nanosized Na-form FAU zeolite possesses high CO2 adsorption capacity (5.93 mmol g–1) at atmospheric pressure. This capacity is attributed to its elevated Na+ content and the presence of large pore sizes (approximately 0.74 nm), positioning it among the most effective systems reported to date. Furthermore, to assess its potential application in the softening of hard water, ion-exchange experiments involving Ca2+ and Mg2+ are pursued over the Na-form FAU sample at 298 K. The results showcase the ion-exchange capacity of 149.3 mg CaCO3/g zeolite and 82.8 mg MgCO3/g zeolite, which is rivaling that of LTA zeolite. These remarkable adsorption capabilities underscore the potential applications of this material in both domestic and industrial contexts.
研究领域:
材料科学
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环境科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
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IF 5.2
Qiang Yu,Wenna Zhang,Junjie Li,Wen Liu,Yanan Wang,Weifeng Chu,Xinbao Zhang,Longya Xu,Xiangxue Zhu,Xiujie Li
Although FAU zeolites have been widely used as absorbents for volatile organic compounds (VOCs) removal, preparation of high-silica FAU zeolite to expand its application under high humidity is still a big challenge. Here, two high-silica FAU zeolites were successfully prepared through the controllable framework modulation strategy. By carefully matching the degrees of dealumination and Si-insertion, the zeolite (FAU-H) with an ultra-high SiO 2 /Al 2 O 3 ratio of 957 was obtained. FAU-H exhibited similar high adsorption capacities of VOCs (e.g. m-xylene and toluene) under dry and humid conditions, more importantly, its adsorption capacity of m-xylene was 25% higher than the industrial high-silica FAU zeolite (HSZ-390HUA) from Tosoh Corporation. When the dealumination degree was mismatched with that of Si-insertion, imperfect FAU-M (SiO 2 /Al 2 O 3 = 108) with the existence of some defect sites was obtained that becomes a good candidate for the adsorption removal of small VOCs molecules (e.g. isopropanol). The moderate interaction between VOCs and zeolite framework is proved a key factor for small molecules adsorption on basis of the DFT calculations. Moreover, the fitted kinetic models, desorption tests, and adsorption−desorption cycling tests proved the good regenerability of FAU-H and FAU-M. Therefore, the proposed high-silica FAU zeolites are promising adsorbents for VOCs removal.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
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