MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.5
Rui Li,Hongjuan Zhao,Tian Xia,Suofu Nie,Chuanhang Zhou,Qiang Zhang,Jiujiang Wang,Penghui Zeng,Maocai Shi,Honghai Liu,Xionghou Gao,Chunming Xu,Baojian Shen
A synergistic vapor-phase strategy using CHCl 3 and SiCl 4 regulates pore structure and acidity in NaY zeolite. • A one-step process constructs a hierarchical micro-mesoporous structure with Al-depleted bulk and Al-enriched surface layer. • Controllable mesopore evolution by tuning the imbalance between CHCl 3 -guided dealumination and SiCl 4 -assisted silication. • A system with Brønsted acidity (framework Si(1Al)) and Lewis acidity (extra-framework Al) is built. To overcome micropore diffusion limitations and acid site regulation in FCC zeolite catalysis, this study develops a synergistic vapor-phase modification using SiCl 4 and CHCl 3 . By tuning the agent ratio, pore structure and acid distribution are optimized while preserving NaY framework integrity. The synergy is not a simple combination but a dynamic process featuring CHCl 3 -guided dealumination and SiCl 4 -assisted silication with a moderate imbalance. CHCl 3 selectively removes Al from Al-rich sites, preserving framework Al predominantly as Si(1Al) units, which generate abundant Brønsted acid sites (BAS) and promote diffusion pathways. Meanwhile, SiCl 4 repairs framework defects and anchors extracted Al as highly dispersed extra-framework Lewis acid sites (LAS). This cooperative interaction creates a hierarchical micro-mesoporous structure with a low-Al bulk and an Al-rich surface layer, retaining abundant BAS while introducing strong LAS-achieving balanced acidity. In n-octane cracking, this architecture enhances diffusion, suppresses hydride transfer, and improves light olefin (C 3 –C 4 ) selectivity. This work provides insights into zeolite structure-performance relationships for rational catalyst design. A synergistic vapor-phase modification creates a zeolite with a hierarchical micro-mesoporous structure, featuring a low-aluminum bulk and an aluminum-rich surface. This architecture optimizes pore connectivity and acid site distribution for enhanced cracking performance. Download: Download high-res image (406KB) Download: Download full-size image
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高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Zunlan Hu,Binbin Fan,Tianci Wang,Zhipeng Xie
This study presents a scalable method for fabricating near-spherical silicon nitride (Si 3 N 4 ) particles with a high α phase content. Amorphous Si 3 N 4 powder was synthesized using the diimide synthesis method, mixed with graphite powder as a carbon source, and calcined at 1550°C to produce α-Si 3 N 4 powder. The effects of varying carbon contents on the phase composition and microstructure of the resulting products were investigated. In the presence of carbon, the Si 3 N 4 particles exhibit a near-spherical morphology, with a reduction in the fraction of whisker-like structures. The products show a complex, nonuniform structure with a broad particle size distribution and varying structural characteristics when excessive powder is added. Graphite powder not only provides nucleation sites but also plays a critical role in the phase transition from amorphous Si 3 N 4 to the α phase. The nucleation and growth of α-Si 3 N 4 are facilitated by the presence of SiO(g), which is reduced through interactions with C(s) or CO(g). It indicates that carbon accelerates the Si 3 N 4 phase transition through the vapor-solid mechanism, which is the key to inhibiting the whisker growth and controlling the particle size of α-Si 3 N 4 powder.
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Energy Storage Materials
·
2023
·
IF 20.4
Muya Cai,Zhuqing Zhao,Xin Qu,Jiakang Qu,Zuojun Hu,Hao Shi,Shuaibo Gao,Dihua Wang,Huayi Yin
Many heterogeneous reduction reactions are hampered by the generated intermediate products located at the interface of reactants, resulting in reducing the reaction area or slowing down the mass transfer and thereby shutting off or slowing down the reaction. Thus, removing the unwanted intermediate products from the reaction interface is key to enabling a rapid and sufficient reduction rate and rationally mediating the product sizes and structures. Herein, we employ solid NaCl to absorb the intermediate molten ZnCl 2 generated at the liquid Zn-SiCl 4 gas interface, making the reaction happen continuously and sufficiently at a relatively low temperature of below 450 °C. In addition to refreshing the reaction interface, NaCl acts as a buffer to absorb the reaction heat, ensuring the production of hollow Si inherited from the spherical liquid Zn template. As a result, the yield of Si reaches over 95% within 2 h and the Si particle size is below 200 nm. Further, the obtained Si anode has an initial Coulombic efficiency of 86.7% and delivers a capacity of 1580 mAh g −1 at 3 A g −1 after 350 cycles with a capacity retention of 90.6%. Overall, this paper provides an effective strategy for engineering the reaction interface and revalorizing waste SiCl 4 for making Li-storage Si anodes.
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高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yixue Yang,Qiang Hu,Guimin Zhang,Xun Xie,Yuxin Liu,Liming Zhou,Kejing Wu,Houfang Lu,Bin Liang
Supported Ni on yttria stabilized zirconia (YSZ) is the most widely used anode for a solid oxide fuel cell (SOFC), where Ni particles are easy to agglomerate at a high temperature of 1400 °C and reductive hydrothermal environments. In this study, Ni particles are successfully dispersed on YSZ through strong interaction between Ni and SiO2. The thin and amorphous SiO2 films, grown by low-temperature chemical vapor deposition (CVD), become spherical particles of nickel silicates uniformly dispersed on the YSZ skeleton after sintering at 1400 °C. Also, the SiO2-anchored Ni particles supported on YSZ (Ni/YSZ-SiO2) are obtained via direct reduction. The electrochemical performance of the Ni/YSZ-SiO2 anode shows a higher power density of approximately 18% than an unmodified Ni/YSZ anode, which resulted from the longer effective TPB area assigned to the highly dispersed Ni particles. The microstructure containing SiO2-anchored Ni particles exhibits high stability under testing and reductive hydrothermal conditions. Accordingly, the method of growing a SiO2 layer via low-temperature CVD is considered as a probable route for the preparation of the Ni/YSZ electrode material with a well-defined microstructure.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
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.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuqi Geng,Yuxiang Zhao,Fen Yue,Qingshan Zhu,Maoqiao Xiang
Si 2 N 2 O ceramic, an emerging functional and structural material, has a wide range of applications. However, the preparation of pure-phase Si 2 N 2 O powder remains challenging due to the mass transfer resistance and undesirable side reactions in the conventional methods. Herein, a novel molecular approach combined with the decomposition process has been developed to synthesize pure-phase Si 2 N 2 O powders. The hydrated Si(NH) 2 precursors were synthesized through the chemical vapor deposition (CVD) of SiCl 4 , NH 3, and humidified N 2 in a fluidized bed reactor (FBR) in two steps. Then, the hydrated Si(NH) 2 precursors were decomposed into amorphous and subsequently transformed into crystalline powders under different temperatures and time. It was found that the molar ratio of N/O of the hydrolyzed Si(NH) 2 can be controlled by N 2 ventilation time and played an important role in synthesizing high pure Si 2 N 2 O powder. When it varied from 2.5:1 to 2:1, pure-phase Si 2 N 2 O powder was obtained after heat treatment at 1300–1500 °C, which features a big tolerance for N/O ratios. This newly developed method offered a chance for the preparation of high-quality Si 2 N 2 O powder with high efficiency and low cost.
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Materials
·
2022
·Vol. 15
·期 8
·2757
·
IF 3.748
Yun Liu,Long Ma,Runa Dong,Kexin Cui,Yongzhao Hou,Wen Yang,Yeqing Liu,Cheng Zhong,Guangwu Wen,Lijuan Zhang
Cf/C-SiC composites have become the preferred material for high-temperature load-bearing applications because of their low density, high strength, and excellent thermal-physical properties. Due to the composite’s poor sintering performance, the sintering temperature and pressure required for the preparation of Cf/C-SiC by traditional methods are also relatively high, which limits its engineering application. Herein, based on the precursor-derived ceramic route and C/C composites material preparation process, a binary binder (coal pitch and polysilylacetylene) is developed, which combines a carbon source, SiC precursor, and semi-ceramic SiC filler organically. Then, the SiC phase was successfully introduced into C/C composites by the slurry impregnation-hot pressing sintering method. The prepared Cf/C-SiC composites showed good mechanical properties, with a density of 1.53 g/cm3and a bending strength of 339 ± 21 MPa. Moreover, the effects of the binary binder on the microstructure, density, and mechanical properties of Cf/C-SiC composites were investigated. This work provides a novel and effective approach to fabricating Cf/C-SiC composites with low density and high strength.Keywords:Cf/C-SiC composite;binary binder;SiC precursor;coal pitch
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高影响因子
Coatings
·
2022
·Vol. 12
·期 3
·329
·
IF 3.236
Rong Tu,Chengyin Liu,Qingfang Xu,Kai Liu,Qizhong Li,Xian Zhang,Marina L. Kosinova,Takashi Goto,Song Zhang
SiC epitaxial wafers offer enormous potential for a wide range of telecom technologies due to their excellent properties. The experimental process was simulated by software, and the contour of gas flow velocity and raw material mass fraction inside the chamber were obtained. SiC films were epitaxially grown on 4H-SiC single crystalline substrates at different temperatures for one batch, using SiCl4, CH4, and H2as precursors. With increasing temperature, the crystal phase changed from 4H-SiC at 1773 K to a mixture of 4H- and 3C-SiC, and then a mixture of 3C-SiC and graphite at higher than 1923 K. The film was mainly (004)-oriented 4H-SiC and (111)-oriented 3C-SiC.Keywords:SiC film;high-frequency induction-heated halide CVD;crystalline phases distribution;microstructure;orientation
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International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3535-3551
·
IF 2.1
Wei Liu,Baobao Zeng,Gao Yang
In this study, we adopted the novel strategies of the soot template method to construct SiO 2 ceramic micro-nano structure surface and polydimethylsiloxane (PDMS) modification to reduce the surface energy. We fabricated a superhydrophobic/superoleophilic NS-PDMS oil–water separation screen by depositing coarse nano-SiO 2 ceramic on the surface of 100-mesh stainless-steel screen used as a substrate under the soot template method, which reduced the surface energy with PDMS. The fabricated NS-PDMS screen exhibited excellent superhydrophobic and self-cleaning properties. In particular, the superhydrophobic properties were stably maintained under various harsh conditions. Overall, the screen manifested self-cleaning ability for various water-containing stains, for example, coffee, milk, beer, and soy sauce. The mechanically damaged screen surface still retained its high roughness, and re-modification with PDMS could recover the superhydrophobic surface and oil–water separation performance. This suggests the re-use potential of the damaged NS-PDMS screen, which is vital for cost reduction and resource recycling. We believe that our study makes a significant contribution to the literature, because the fabricated NS-PDMS screen is superhydrophobic, superoleophilic, resistant toward several water-based solutions, chemically and mechanically stable under certain conditions, and can be reused with modification and repair after damage. Therefore, this screen can be broadly used as an oil–water separator.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Ke Yang,Shan Zhong,Hairong Yue,Siyang Tang,Kui Ma,Changjun Liu,Kai Qiao,Bin Liang
Pulsed chemical vapor deposition (P-CVD) is a promising technology for the surface modification of TiO 2 particles. For the scale-up application of P-CVD, a custom-designed rotary reactor and corresponding coating process at room temperature was developed in the present work. The obtained SiO 2 -coated TiO 2 particles were characterized by various measures including high-resolution transmission electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, etc . The results illustrated that the SiO 2 films with a thickness of (3.7 ± 0.7) nm were successfully deposited onto the surface of TiO 2 particles. According to the dye degradation tests and acid solubility measurement, the deposited film can effectively inhibit the photocatalytic activity and enhance the weatherability of the TiO 2 particles. Zeta potential measurements showed that the SiO 2 -coated TiO 2 is possible to be stably dispersed in the pH range of 6.9–11.6. The coating process made the whiteness of TiO 2 particles decreased slightly but still sufficient (97.3 ± 0.1) for application. Furthermore, the properties of the TiO 2 particles coated by P-CVD were compared with the particles coated by traditional wet chemical deposition. It is shown that the P-CVD can produce thinner but denser films with better photoactivity suppression performance. The developed coating process within the rotary reactor was proved practically feasible and convenient for the scale-up production of SiO 2 -coated TiO 2 via P-CVD.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Rupeng Zhang,Can Cui,Ruinan Li,Yaqi Li,Chunyu Du,Yunzhi Gao,Hua Huo,Yulin Ma,Pengjian Zuo,Geping Yin
Due to the good safety and high energy density , rechargeable Mg-metal batteries (RMMBs) have been regarded as a potential competitor of Li-metal batteries (LMBs). However, the Mg(TFSI) 2 -based conventional electrolytes will cause large overpotential in reversible plating/stripping attributed to the high ion transport impedance of the electrolyte decomposition products. Here, an artificial interphase composed of amorphous (a-) MgCl 2 @polymer on the Mg-metal surface is prepared by in-situ chemical reaction of metallic Mg with H 3 PO 4 and SiCl 4 in sequence, and can effectively inhibit the electrolyte decomposition and facilitate Mg 2+ transport, which plays the role of solid electrolyte interface (SEI) on Mg anode. The Mg-Mg symmetrical cell with modified Mg electrode exhibits lower overpotential (~0.25 V) and interfacial impedance than bare Mg electrode in 0.5 M Mg(TFSI) 2 /DME electrolyte. The voltage hysteresis in the Mg-S and Mg-Mo 6 S 8 batteries with the modified Mg anode is greatly improved compared to bare Mg anode. This work provides a new idea for future applications of passivation-free Mg-metal anode technology in the MMBs based on conventional electrolytes.
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Polymers
·
2019
·Vol. 11
·期 10
·1574
·
IF 3.164
Yuanjie Wang,Xinzhi Liu,Liying Liu,Hui Niu
In this work, a series of isotactic-polypropylene/atactic-polystyrene (iPP/aPS) miktoarm star copolymers, PxSy, was synthesized via an arm-first approach. Varied star macromolecule architectures were fabricated by designing the arm length and the arm numbers (x and y). These miktoarm stars were able to form micelles in selective solvent (N,N′-dimethylformamide (DMF)), in which the insolubleiPP arms formed the core and the solubleaPS arms formed the shell. The miktoarm polymers aggregated to micro-nanoscale binary structures (MNBSes) in the casting process, and their morphologies, including the MNBS shape and size, were greatly influenced by the PxSyarchitectures. The MNBSes endowed the material surface with superhydrophobic performance with a water contact angle of 157.0° and a sliding angle of 1.5°.Keywords:miktoarm star copolymer;isotactic-polypropylene;atactic-polystyrene;aggregation morphology
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高影响因子
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