ENERGY & FUELS
·
2022
·
IF 4.654
Xiaohan Wang,Zhiqing Yu,Jinxiao Sun,Qiang Wei,Haoran Liu,Wenbin Huang,Luyuan Zhao,Meng Si,Yasong Zhou
A series of in situ dodecyl trimethyl ammonium bromide (DTAB)-modified small-crystal Y zeolites have been successfully synthesized by DTAB addition to the seed synthesis procedure, which was used to create the small crystal size Y zeolites. Compared to the Y zeolites prepared without DTAB, the Y zeolites prepared with DTAB have a uniform morphology and mesoporous structure, a larger specific surface area (up to 32.3 m2 g–1 increase), a smaller crystal size (up to 66 nm reduction), and more Brönsted acid sites (up to 55 μmol/g increase). After loading with NiW, the corresponding NiW catalysts were utilized in the hydrocracking of n-hexadecane. It is evident from the catalytic performance that the catalysts containing DTAB-modified small-crystal zeolites have a higher yield and selectivity of primary cracking products compared with the Y zeolites without DTAB modification. Moreover, the conversion of n-hexadecane is also higher due to its low mass-transfer resistance, high dispersion, and sulfation of W species. When the molar ratio of DTAB/Al2O3 is 0.15, the corresponding catalyst has the optimum balance between cracking and hydro–dehydrogenation activity. Therefore, it has the most excellent catalytic performance and a 7.3% increase in C8–C12 yield.
研究领域:
催化材料
·
石油化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xianyi Jiang,Zilong Deng
In this study, we designed a microfluidic configuration incorporating with a directional channel perpendicular to the main channel before a Y-junction, enabling precise control over droplet splitting by adjusting the directional flow rate. Our experiments revealed four distinct flow regimes and the fitting formula accurately predicted the critical directional points in the flow regime map under different capillary numbers. Trajectory analysis of the solid cores demonstrated that their displacement within compound droplets is influenced by both the directional and main channel flow rates, and we proposed a theoretical model to accurately predict this displacement. Moreover, particle image velocimetry experiments are conducted to provide insights into the velocity field evolution across different flow regimes, highlighting the significant impact of flow rates on droplet deformation, splitting, and solid core movement. The results enhance the controllability of microfluidic systems and broaden their applicability in fields like biomedicine and chemical engineering.
研究领域:
生物医学工程
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化学工程
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Yuncheng Zhou,Peng Jiang,Honghong Lei,Yong Li,Wenbin Cao,Jianlei Kuang
BaAl 2-x Mn x O 4+y (0 ≤ x ≤ 0.10) showing intense turquoise to green colors were prepared by the sol-gel method from metal nitrides as precursors and followed by a thermal treatment at 900 °C. The X-ray diffraction of all of the as-synthesized samples are indexed with BaAl 2 O 4 stuffed tridymite structure. The oxidation state of Mn is confirmed to be +5 by X-ray photoelectron spectroscopy analysis. The colors of the samples are tuned to intense turquoise and green with the increase of Mn content . The optical properties are characterized by UV–Vis absorbance spectra and CIE L ∗ a ∗ b ∗ coordinates. The reason for the intense colors is due to the Mn 5+ doping in the [AlO 4 ] tetrahedral sites. The pigments are applied to poly(methyl methacrylate) (PMMA) and the colours of the polymer composite were characterized.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2015
·
IF 3.966
Xiaolong Li,Yin Xiao,Shirong Wang,Xianggao Li
A microemulsion phase transfer method was developed to prepare Y-type titanylphthalocyanine nanocrystals (Y-TiOPc NCs) with an average diameter of 2.3 ± 0.8 nm. The purification and crystal transformation of TiOPc could be achieved in the one-step process by establishing a stable H 2 O/ o -dichlorbenzene microemulsion at high shear rate . The photoelectric characteristics of the ultrasmall Y-TiOPc NCs were evaluated by acting as the photoactive materials in organic photoreceptors , which afforded an impressive photosensitivity of E 1/2 = 0.064 μJ/cm 2 . The dispersion of the Y-TiOPc NCs in a solution of polyvinyl butyral , methylethylketone and cyclohexanone (PVB/MEK/CYC) showed excellent dispersibility (zeta potential: –50.0 mV) at least 60 days and suffered no photoelectric penalty. The excellent solvent-stabilized dispersibility mainly relied on electrostatic repulsion force resulting from the high charge-mass ratio due to ultrasmall particle size.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 10
·106506
·
IF 3.9
Yanli Wang,Rongfa Sun,Lingxu Yang,Huijun Liu,Chaoliu Zeng
In this paper, the electrochemical behavior of Zr(IV) and Y(III) in NaCl-KCl-K2ZrF6-YCl3 molten salts is studied by cyclic voltammetry, linear sweep voltammetry, and chronopotentiometry methods, which will provide a theoretical foundation for the preparation of Zr-Y alloy coating by molten salt electrodeposition method. Results show that the reduction of Zr(IV) on molybdenum electrode is a three-step charge-transfer process, while the reduction of Y(III) is a single-step diffusion-controlled three-electron quasi-reversible process at −0.30 V vs Pt. In addition, the diffusion coefficient of Y(III) in the melt at 750 °C is calculated as 2.15 × 10−5 cm2·s−1. The reduction of Zr(IV) and Y(III) on molybdenum electrode in NaCl-KCl-K2ZrF6-YCl3 molten salts has also been studied by cyclic voltammetry method. Results indicate that the Zr-Y alloy coating can be obtained on molybdenum electrode by galvanostatic electrolysis at −1.50 V vs Pt for 30 min.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yu Zhang,Xu Shen,Qin Ma,Shuang Mu,Shaoming Dong,Jinshan Yang
The wet oxidation behavior of LPS-SiC ceramics as well as the synergistic modification effect of Al 2 O 3 and Y 2 O 3 as sintering aids are investigated. The results show that SiO 2 oxide scale is transformed to aluminosilicate with the addition of Al 2 O 3 , which can inhibit the crystallization of oxide layer and formation of cracks. The aluminosilicate oxide layers have low k l value close to zero, which can reduce the consumption of protective oxide layer under water-containing atmosphere. Y 2 O 3 are mainly transformed to Y 2 Si 2 O 7 to resist the diffusion of oxidative gas. However, with the increase of sintering aids content, the aluminosilicate layer with excessive viscosity limits the emission of gas generated by oxidation and causes many bubbles left in oxide scale which provided rapid channel for oxidative gas. Therefore, LPS-SiC with lower content of sintering aids has better oxidation resistance. This work can provide guidance for the component design of SiC-based ceramics and composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Zepeng Lv,Dong Liu,Yijie Wu,Run Zhang,Haibo Sun,Jie Dang,Liwen Hu
Tungsten, one of the refractory metals, has lots of excellent properties, making tungsten powders become a choice of raw material for many applications. This work reported a simple method (the salt-assisted hydrogen reduction of WO 3 powders) for preparing tungsten powders with desired morphologies and size. By adjusting the amount of additive (Y(NO 3 ) 3 ) and reduction temperature, metallic tungsten particles with different morphologies and size were obtained. It was found that both temperature and additive had apparent effects on the morphology and size of metallic W particles, and the large parallelepiped-shaped powders disappeared and large irregular blocky-shaped powders were degraded under the influence of additive. With the increase of temperature and amount of salt, particles became more dispersed and the size increased at higher temperatures, and the shape of particles was changed from spherical to polyhedral as well. On the contrary, the size of sub-particles became smaller as increasing amount of Y(NO 3 ) 3 at lower temperatures. Based on the results, the reaction and refining mechanisms for preparing tungsten were proposed as well.
研究领域:
材料科学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing Wang,Xiaowei Mei,Fan Zhang,Yongsheng Liu,Dong Wang,Jingxin Li,Ning Dong
This study systematically investigates the influence of preparation temperature on microstructure and generation mechanism of Si–Y–B-Yb ceramics as anti-corrosion matrix. Main phases of Si–Y–B-Yb ceramics are Y/YbB 4 , YSi 2 , and Si, where Y/YbB 4 is derived from the reaction between YSi 2 and YbB 6 . With increase in preparation temperature, open porosity of Si–Y–B-Yb ceramics gradually decreases, reaching 0.24 % at 1350 °C, and internal phases transform from a dispersed distribution to clearly defined boundary state. Based on this, high-temperature water-oxygen corrosion behavior of Si–Y–B-Yb ceramics is characterized in 50 vol% H 2 O+50 vol% O 2 environment at 1250 °C for 100 h. In this corrosive environment, silicate phase appears on the surface of Si–Y–B-Yb ceramics. With prolonged corrosion time, silicate phase gradually forms more complete protective layer, hindering further corrosion by water-oxygen environment. These results demonstrate the feasibility of proposed Si–Y–B-Yb materials for corrosion protection.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Zilin Wu,Chun Zhang,Yuanqin Huang,Na Tao,Tao Wang,Xiaobo Cai,Zhenchao Wang,Xiangyang Li
Potato virus Y (PVY) is a plant virus that is known to be responsible for substantial economic losses in agriculture. Within the PVY genome, viral genome-linked protein (VPg) plays a pivotal role in the viral translation process. In this study, VPg was used as a potential target for analyzing the antiviral activity of tryptanthrin derivatives. In vitro, the dissociation constants of B1 with PVY VPg were 0.69 μmol/L (measured by microscale thermophoresis) and 4.01 μmol/L (measured via isothermal titration calorimetry). B1 also strongly bound to VPg proteins from three other Potyviruses. Moreover, in vivo experiments demonstrated that B1 effectively suppressed the expression of the PVY gene. Molecular docking experiments revealed that B1 formed a hydrogen bond with N121 and that no specific binding occurred between B1 and the PVY VPgN121A mutant. Therefore, N121 is a key amino acid residue in PVY VPg involved in B1 binding. These results highlight the potential of PVY VPg as a potential target for the development of antiviral agents.
研究领域:
植物病理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2020
·Vol. 132
·期 1
·417-429
·
IF 1.52
Xie Qi,Miao Changxi,Lei Tianqi,Hua Weiming,Yue Yinghong,Gao Zi
Dehydrogenation of ethane assisted by CO 2 has been investigated over Au catalyst supported on Y-doped CeO 2 nanorod. The catalysts were characterized by XRD, TEM, N 2 adsorption, XPS, TG, H 2 -TPR and Raman spectroscopy. Enhanced activity can be obtained after the proper Y doping. The optimal catalyst Au/Ce 0.9 Y 0.1 exhibits an ethane conversion of 20.9% and nearly 100% selectivity to ethylene without any evident tendency of deactivation in 50 h. The reducibility of surface oxygen species is found to play a key role in the dehydrogenation assisted by CO 2 , which can be improved by proper Y doping into CeO 2 nanorod. The promoting effect of CO 2 on activity is evident over Au/Ce 0.9 Y 0.1 catalyst, due to the quick transformation of H 2 product into H 2 O by the reverse water gas shift reaction. The catalyst stability is also improved by the addition of CO 2 , attributed to the elimination of coke by Bouduoard reaction.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yu Jiang,Marhoun Ferhat,Wenhao Fan,Shaoping Chen,Yachao Wang,Jie Chen,Rasha Abdullah Ahmed Al-Yusufi,Chaochao Dun
Additional cation doping is one of the potential strategies to enhance the thermoelectric (TE) performance of Mg 3 Sb 2 -based materials with precise regulation of interaction between cations and the host. In this work, using Mg 3 Sb 1.5 Bi 0.5 as an example, we confirmed that co-doping rare-earth elements with Y and La is capable to simultaneously improve its power factor and suppress the thermal conductivity : Y is an effective n -type dopant to regulate the optimal carrier concentration, while La doping can modulate the band structure and increase the effective mass that related to the improved Seebeck coefficient . A promising power factor of 18.3 μW cm -1 K -2 is obtained after co-doping. Meanwhile, the lattice thermal conductivity is dramatically reduced to 0.39 W m -1 K -1 at 750 K thanks to the extra defect scattering introduced by Y and La. As a result, a peak figure of merit ( zT ) of 1.76 and a competitive average zT of 1.1 among 300–750 K are achieved in Mg 3.2 Y 0.04 La 0.01 Sb 1.5 Bi 0.5 . The synergistic effect stemming from dual-cations doping provides profound insights for controllable host-dopant design and modulation toward high-efficient n-type TE materials .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 100
·期 1
·243-254
·
IF 2.8
Cui Quan,Yingying Zhou,Hua Chu,Xiaolei Fan,Ningbo Gao
BACKGROUND Ethyl lactate produced via esterification between lactic acid and ethanol can be used in plastics, polymers and food industries and renowned for its biodegradability and low toxicity. However, lactic acid self-catalyzed esterification presents a slow reaction process, and acid catalysts are needed to improve the catalysis. Homogeneous acid catalysts like H 2 SO 4 are corrosive, as well as being difficult to be seperated from the reaction media; therefore, advanced heterogeneous catalysts are more ideal. In this study, two kinds of heteropolyacid–zeolite catalysts, involving loading silicotungstic acid and phosphotungstic acid onto Y zeolite, were synthesized, characterized using X-ray diffraction, NH 3 temperature-programmed desorption and scanning electron microscopy and analyzed for their catalytic efficiency in the catalytic esterfication. RESULTS Results showed that the Keggin structures of heteropolyacids were retained during the preparation process and strong acid sites of Y zeolite were enriched, which made the main contribution to the esterification of lactic acid and ethanol. Furthermore, the initial-stage reaction rate of esterification was significantly enhanced. During the first hour of esterification, the conversion of lactic acid increased from 18% to 65%. Exp Dec1 index model was employed to determine the activation energies of 60HSiW-Y and 60HPW-Y, which exhibit values of 29.3 and 28.2 kJ mol −1 , respectively. CONCLUSION This study indicates that Keggin structures of heteropolyacids play a key role in the esterification and heteropolyacid–zeolite catalysts can effectively catalyze the esterification. Meanwhile, the results of the kinetic experiments can be of reference significance for large-scale industrial processes involving esterification. © 2024 Society of Chemical Industry (SCI).
研究领域:
化学工程
·
催化化学
✓ 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）