JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
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IF 2.298
Wenliang Cui,Jilong Wang,Yueyang Xu,Zijia Cao,Yongping Zeng
Faujasite (FAU) zeolites with low Si/Al ratios (e.g., X-type zeolites) have much more exchangeable cation sites than those with high Si/Al ratios (Y-type zeolites) for Cu(I), which could improve the adsorption performance via π-complexation. However, the structure of Cu-exchanged X-type zeolites was unstable during autoreduction at high temperatures as reported [Takahashi; et. al., Ind. Eng. Chem. Res., 2002, 41, 2487−2496]. Here, we proposed a scheme of Cu-exchanged X-type zeolites in copper–ammonia solution to improve the stability of the zeolite structure during autoreduction. Therefore, it makes us be able to study the adsorption properties of thiophenic compounds in Cu(I)-exchanged FAU zeolites from low to high Si/Al ratios. The modified zeolites were characterized by X-ray diffraction, high-resolution transmission electron microscopy, inductively coupled plasma spectroscopy, X-ray fluorescence, and Brunauer–Emmett–Teller analysis and tested by adsorption desulfurization experiments in model fuels. The results indicate that the modified zeolites with various Si/Al ratios show different adsorption properties for thiophene and benzothiophene. The adsorption capacity for thiophene decreased in the order Cu(I)Y-5.30 > Cu(I)X-1.23 > Cu(I)Y-2.30. For benzothiophene, the adsorption capacity decreased in the order Cu(I)Y-2.30 > Cu(I)Y-5.30 > Cu(I)X-1.23.
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
Journal of Environmental Sciences
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2025
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IF 6.3
Shanshan He,Lan Zhang,Yangyang Guo,Zexiao Ren,Xiang Dong,Yan Zhao,Qihong Cen,Bo Pan
A novel FAU type zeolitized ceramsite (FZC) was prepared via a novel three dimensional (3D) in-pore growth method. FZC is a centimeter sized spherical particle with a 3-dimensional radial morphology inside, with a specific surface area and pore volume 6 and 30 times that of the original ceramsite, respectively. The unique structure was constructed through electrostatic and polymerization interactions between hexadecyl trimethyl ammonium bromide (CTAB) micelles, ceramic pore walls and silicate aluminate ions, which could simultaneously improve adsorption capacity and mass transfer, endowing FZC with excellent heavy metal adsorption properties. FZC-50 could remove the majority of Cu and Zn from solution within shorter periods (73.3 % and 80.0 % of original ceramsite, respectively) with larger adsorption capacities (3400 % and 3700 % of original ceramsite, respectively). Theoretical analysis and regeneration experiments both indicate that the adsorption of Cu(II) and Zn(II) on FZC-50 is dominated by ion exchange. And the spent sorbent can be effectively regenerated by NaCl, and the cycle number is expected to be 33 and 26 times for Cu(II) and Zn(II) adsorption, respectively. This work proposed a novel synthesis route to construct a 3D multi-stage porous zeolite inside ceramsite, and opened up new ideas for the further development of zeolitized ceramsite.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Ling Pan,Song Ye,Ruihao Huang,Meiyan Wang,Peixuan Lin,Haoran Zhang,Deping Wang
Faujasite (FAU) zeolites with abundant exchangeable sites are ideal hosts for the intake of Ag+ and the stabilization of highly luminescent silver nanoclusters (Ag NCs), while theoretical calculations on the spectral characteristics, charge states, and electronic energies of Ag NCs that are confined inside FAU zeolite were seldom reported. In this research, the Na-type FAU zeolites with varying silicon-to-aluminum (Si/Al) ratios were first synthesized with the hydrothermal method and then applied as matrixes to stabilize Ag NCs to obtain tunable emissions. With the decrease in the Si/Al ratio, the Ag NCs show red-shifted emission from 515 to 548 nm and broadened photoluminescence of excitation (PLE) and photoluminescence (PL) spectral profile. The time-dependent density functional theory (TD-DFT) method was carried out to probe the effect of Al substitution on the charge states and the optical properties of Ag NCs confined inside the double-six ring (D6r) cavity. The simulated results of the absorption spectra and energy levels suggest that the S1 → S0 transition of the monovalent Ag3+ cluster is responsible for the visible emission, and the increased full width at half-maximum (fwhm) of the PLE and PL spectra in the low Si/Al ratio FAU zeolites is due to the inhomogeneous broadening brought by the increased isomer numbers of the Al-substituted neutral zeolite framework. It is noted that the peak of the simulated absorption spectra red-shifted with the decrease in the Si/Al ratio, which is consistent with the experimental observation. This research provided an effective method for the manipulation of Ag NC emission in FAU zeolites through framework cation substitution and meanwhile theoretically explained the Si/Al ratio dependence of tunable emission properties, which may benefit the design of zeolite-confined Ag NCs with desirable optical performances.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yifan Zhang,Yangyang Guo,Shanshan He,Honglin Guo,Lei Luo,Mengran Li,Tingyu Zhu,Tao Guo,Yanxi Deng
CO 2 capture from blast furnace gas is of great significance for carbon reduction. 13X zeolites are frequently employed as CO 2 adsorbents. Nevertheless, their large-scale utilisation in industrial applications is impeded by the presence of H 2 O and H 2 S in blast furnace gas. To develop CO 2 adsorbents suitable for carbon capture from blast furnace gas, a series of Faujasite (FAU) zeolites were prepared in this study by modulating Si/Al. The findings revealed that the separation coefficients of CO 2 /N 2 and CO 2 /CO increased by 72 % and 144 %, respectively, and that the H 2 O adsorption decreased by 23 % when Si/Al was increased from 1.45 to 2.93. Furthermore, breakthrough experiments demonstrated that enhancing the Si/Al ratio of FAU zeolite can effectively reduce the dynamic adsorption capacity of H 2 O and H 2 S. Physicochemical characterizations of the zeolite before and after H 2 S adsorption were performed: CO 2 and N 2 adsorption isotherms, thermogravimetry, In-situ FT-IR and XPS. The present study investigates the effect of H 2 S adsorption on zeolites with varying Si/Al ratios. When combined with DFT calculations, the results demonstrate that the elevated Si/Al ratio of the zeolite results in a significant increase in sulfur resistance and easier deposition of H 2 S in the form of sulfate on the zeolite surface. It indicates that the modulation of Si/Al ratio is an effective method to improve the water and sulfur resistance of zeolites, and provides core material support for the practical application of large-scale carbon capture technology for blast furnace gas.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ruihan Yang,Shafqat Ullah,Yujun Wang,Guangsheng Luo,Zhen Qian
Isoprene is of great importance as a valuable monomer for most chemical industries owing to the increasing demand for synthetic rubber. To obtain polymer-grade olefins, the removal of alkyne compounds from isoprene is mandatory and challenging. Adsorption separation using zeolites is one of the most promising alternatives for alkyne/olefin separation. Herein, a combination of batch, fixed bed column experiments and configurational-bias grand canonical Monte Carlo (CB-GCMC) simulations was applied to study alkyne’s selective adsorption from binary liquid-phase isoprene/1-pentyne mixtures in faujasite (FAU) zeolites. The adsorption separation performance, including the adsorption capacity and selectivity, was obtained based on the liquid-phase measurement method developed in this study. FAU zeolites exhibited 218 mg/g alkyne adsorption capacity and relatively high adsorption selectivity at low alkyne concentrations. Liquid adsorption separation of linear alkyne/olefin mixtures, covering 1-pentyne/1-pentene (C 5 ) and 1-hexyne/1-hexene (C 6 ), in FAU zeolites, was performed further to investigate the separation performance for alkynes and olefins. The binary isotherms for the 1-pentyne/isoprene system and extended studied olefin/alkyne systems were reproduced well by CB-GCMC simulations. The visualized average occupation profiles of adsorbate molecules in FAU zeolites showed that alkyne and olefin molecules were mainly distributed near the 4-rings and 6-rings. The concentrated areas were arranged perpendicular to each other.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Chen Zhou,Junjie Zhou,Aisheng Huang
In this study, dense and phase-pure zeolite FAU membrane has been prepared on α-Al 2 O 3 tube using a seeding-free synthesis strategy. 3-aminopropyltriethoxysilane (APTES) acts as a molecular linker for anchoring the FAU precursors onto the support surface to promote the nucleation and the formation of a thin, well intergrown zeolite FAU membrane. The obtained membranes are employed for desalination of seawater by pervaporation . With the increase of the synthesis time from 12 h to 24 h at 75 °C, the water fluxes of the zeolite FAU membranes reduce from 4.22 kg m −2 h −1 to 3.42 kg m −2 h −1 at 75 °C due to the increase of the thickness of the zeolite FAU membranes, while the ions rejections increase from 99% to 99.9%. For the zeolite FAU membrane which was prepared at 75 °C for 20 h, with increasing the feed temperature from 30 °C to 90 °C, the water fluxes increase from 0.96 kg m −2 h −1 to 5.64 kg m −2 h −1 , and all the ions rejections of the zeolite FAU membrane are above 99.8%. Note that the zeolite FAU membranes show high separation performances for seawater desalination, even for desalination of 10 wt% seawater, the developed zeolite FAU membranes are very promising in seawater desalination.
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
Jove-Journal of Visualized Experiments
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2022
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IF 1.424
Zheting Chu,Jiaxin Liang,Dazhong Yang,Jing Li,Hong Chen
Heavy metal-polluted water is of great concern to human health and the eco-environment. In situ water remediation techniques enabled by highly efficient adsorption materials are of great importance in these circumstances. Among all the materials used in water remediation, iron-based nanomaterials and porous materials are of great interest, benefiting from their rich redox reactivity and adsorption function. Here, we developed a facile protocol to directly convert the widely spread red soil in south China to fabricate the Fe2O3/faujasite (FAU)-type zeolite composite material. The detailed synthesis procedure and synthesis parameters, such as reaction temperature, reaction time, and the Si/Al ratio in the raw materials, have been carefully tuned. The as-synthesized composite materials show good adsorption capacity for typical heavy metal(loid) ions. With 0.001 g/mL Fe2O3/FAU-type zeolite composite material added to different heavy metal(loid)-polluted aqueous solutions (single type of heavy metal(loid) concentration: 1,000 mg/L [ppm]), the adsorption capacity was shown to be 172, 45, 170, 40, 429, 693, 94, and 133 mg/g for Cu (II), Cr (III), Cr (VI), As (III), Cd (II), Pb (II), Zn (II), and Ni (II) removal, respectively, which can be further expanded for heavy metal-polluted water and soil remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
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IF 2.8
Yutong Liu,Yong Qiu,Qi Zhu,Tao Tian
Adsorption technology utilizing zeolites as adsorbents is a highly efficient and cost-effective method for controlling the emission of volatile organic compounds (VOCs). Herein, two hierarchical diatomite/FAU-type zeolite composites were synthesized by a seeding-assisted secondary hydrothermal growth method and high-temperature hydrothermal dealumination, respectively. The adsorption properties of the composites for VOCs, such as toluene, ethyl acetate, n-heptane, methanol and acetone, were systematically evaluated. The pseudo-second-order model provided a perfect fit to adsorption kinetics, while the Langmuir model agreed the best with the adsorption isotherms. Furthermore, Dt/USY has remarkable recycling stability even after five regeneration cycles, resulting in outstanding VOCs adsorption efficacy.
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
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yunhe Li,Xiubo Min,Yilin Wei,Peiyuan Liang,Yixuan Yu,Tianjun Sun
Zeolite-based catalysts are extensively investigated for industrial applications due to their unique pore structure, remarkable thermal/hydrothermal stability, and abundant acid sites. However, the inherent lack of active sites for oxygen activation in non-reducible supports leads to suboptimal low-temperature oxidation activity. This study synthesized SSZ-39 (AEI-type) zeolite via interzeolite transformation from Y (FAU-type) zeolite, exploring the effects of gel composition on its structural properties and the influence of different cerium precursor salts on the CO oxidation performance of platinum-loaded zeolite catalysts. The results show that introducing seed crystals can replace 40 % of the organic structure-directing agent, leading to the synthesis of pure SSZ-39 zeolite with a specific surface area of 588 m 2 /g, where aluminum species are solely present as framework aluminum. The Pt-8Ce(ca)/SSZ-39 catalyst, prepared using cerium acetate as the precursor, demonstrates excellent low-temperature activity and stability, achieving 100 % CO conversion at 150 °C and maintaining it for over 100 h. After hydrothermal aging at 750 °C, the conversion temperature increased by only 20 °C, with the outstanding hydrothermal stability attributed to the stable framework structure of SSZ-39 zeolite. The highly dispersed Pt-CeO 2 interface increases surface-active oxygen species, which induce the transition from the L-H to the MvK reaction mechanism. This reduces competitive adsorption between O 2 and CO, and the oxygen vacancies formed during the reaction serve as additional O 2 activation sites, addressing the low-temperature CO oxidation issue in non-reducible support zeolite-based catalysts.
研究领域:
催化
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材料科学
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化学工程
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环境科学
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无机化学
✓ 已验证
DOI
高影响因子
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