Journal of Chemistry
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2020
·
IF 1.79
Xiaofang Liu,Zhigang Liu,Qiuyun Zhang,Hongguo Wu,Rui Wang
MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.
研究领域:
化学工程
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材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2011
·Vol. 13
·期 17
·5460-5466
·
IF 4.006
Manying Liu,Lizhi Zhang,Kewei Wang,Zhi Zheng
The Kirkendall effect has gained intense attention and wide acceptance in nanoscience and nanotechnology because it can result in porosity or deformation in the case of the alloying or oxidation of metals. In this work, we report a facile approach to prepare δ-Bi2O3 solid spheres and further convert them to hierarchical BiOI nests for the first time through a solvothermal reaction at low temperature. The δ-Bi2O3 and BiOI samples obtained were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The formation mechanism has been proposed by emphasizing the Kirkendall effect. We also found that the template of δ-Bi2O3 solid spheres was initially formed by surfactant oleylamine induction. Anion exchange has been confirmed to occur in the reaction involving the Kirkendall effect.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Yulong Chen,Jijun Wu,Yujuan Xu,Manqing Fu,Gengsheng Xiao
A second cooling was added to the oil collectors of an improved Clevenger-type apparatus (ICT) to investigate the thermal reaction of essential oils from orange peel compared to a traditional Clevenger-type apparatus (CT). The results demonstrated the yield rate of essential oil from ICT was significantly higher (p < 0.05) than that from CT. The major components of the essential oils consisted of monoterpenes, such as d-limonene, β-myrcene, β-pinene, γ-terpinene, α-pinene. Interestingly, ICT prevented the thermal reaction—the transformation of β-myrcene to β-thujene—and reduced the oxidation on α-pinene and β-pinene of the essential oil in comparison to CT. In addition, the yield rate of γ-terpinene can also be improved via ICT compared to CT. Thus, ICT is an effective improvement to traditional CT.
研究领域:
植物化学
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食品科学
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芳香植物研究
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenhui Wang,Ruikang Zhang,Xiaoru Gao,Borong Yu,Zhan-gang Han,Yuanzhe Gao
Nickel and cobalt phosphates as a kind of low-cost inorganic materials are promising electroactive materials. The structure stability and good dispersibility of micro-spherical materials make them popular in the energy storage field. Therefore, the fabrications of Ni–Co phosphate microspheres with some facile and cost-effective methods have attracted lots of attentions. In this work, we present one-step growth of Ni 2 Co(PO 4 ) 2 microspheres using urea as pH regulator. Urea decomposes into NH 3 and CO 2 during the hydrothermal reaction process, resulting in the precipitation of Ni–Co phosphates. The as-prepared Ni 2 Co(PO 4 ) 2 microspheres exhibit uniform and well-dispersed spherical morphology. Compared with traditional Ni 2 Co(PO 4 ) 2 particles, Ni 2 Co(PO 4 ) 2 microspheres exhibit larger electrochemical specific surface area and smaller resistance of electrons/ions transfer. The specific capacity of Ni 2 Co(PO 4 ) 2 microspheres reaches as high as 153 mAh g - 1 at a current density of 1 A g - 1 , which is 1.59 times higher than that of traditional Ni 2 Co(PO 4 ) 2 particles. In addition, this facile one-step synthetic method can be applied to fabricate series of Ni–Co phosphates with different Ni/Co atomic ratios. This work provides a facile synthetic method of fabricating Ni–Co phosphate materials, which has potential applications in large-scale manufacture.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiandie Zhang,Linfeng Yue,Heng Xu,Haozhe Li,Jiaming Liu,Xiang Zhou,Xiaode Guo
The study employed a two-step synthesis method to prepare Al@PFHP@fluoropolymer energetic composites with a core–shell structure. PFHP and HF acid are used for surface etching and modification of raw Al powder. PFHP bonds to the surface of Al powder, with redundant C-F providing hydrogen bonding sites, driving dissolved PVDF and P(VDF-HFP) polymer chains in the liquid phase to migrate, nucleate, and grow on the surface of the Al powder, and consequently the formation of a continuous shell layer through hydrogen-bonding self-assembly. The Al powder coated with fluoropolymer exhibited strong hydrophobic and corrosion-resistant properties, ensuring long-term storage and environmental adaptability. Compared to mechanically mixed Al@PFHP/fluoropolymer, the Al@PFHP@fluoropolymer composites show significant improvements in thermal reactivity, ignition, and combustion performance. The close integration of fluoropolymer and Al shortens the mass and heat transfer distances during the reaction process. Additionally, the low-boiling-point AlF 3 does not hinder diffusion process in the combustion zone, which is conducive to the alleviation of the reaction sintering phenomenon and the rapid and concentrated release of energy. Therefore, through the dual strategy of using fluorine-containing oxidizers and structure optimization, efficient reaction of Al@PFHP@fluoropolymer is achieved, also promoting efficient combustion of Al powder. The synthesis process of this energetic composite is simple yet yields exceptionally high performance, enabling large-scale production and application potential in military ammunition and rocket propulsion systems.
研究领域:
材料科学
·
能源与推进
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 19
·6339-6348
·
IF 2.371
He Beibei,Zhao Qingguo,Zeng Zhigang,Wang Xiaohong,Han Sheng
Au@CeO 2 core–shell nanostructure catalysts were synthesized by hydrothermal reaction method. The effect of hydrothermal reaction time and calcination temperature on the textural and morphological characteristics of the catalyst was investigated by TEM, SEM, XRD, XPS, ICP, UV–Vis, and N 2 adsorption–desorption techniques. The results proved that gold core and CeO 2 shell formed simultaneously at the beginning of the reaction. By extending the hydrothermal reaction time, both the grain size of Au core and CeO 2 shell increased. The crystallization degree of CeO 2 and the interaction between Au and CeO 2 were also enhanced. The 90 % CO conversion temperature (T 90 % ) of Au@CeO 2 declined from 187 to 142 °C with the hydrothermal reaction time extended from 6 to 20 h. After 70-h reaction, the catalytic activity was still maintained without any loss. The effect of the calcination temperature on the catalytic performance was also investigated and it turned out that high calcination temperature has a positive influence on the catalytic activity. The likely active sites are the interface between Au core and CeO 2 shell. Gold content, metal–support interaction (MSI), and oxygen vacancy are all related to the activity. The excellent performance of 20 h-600 °C-Au@CeO 2 in catalytic activity and stability results from the joint effects of these triple factors.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junying Huang,Mengting Chen,Tao Tang,Weipeng Liu,Yingju Liu
The self-supporting catalytic electrode is useful in the industry, since it can reduce the complex pre-treatment of catalytic materials and avoid the use of binders. In this work, a ternary self-supporting electrode including Cu mesh-supported graphene and molybdenum disulfide (MoS 2 ) was prepared by electroplating zinc and hydrothermal reaction . Due to the excellent conductivity of copper and the hydrogen evolution catalytic ability of MoS 2 , this self-supporting electrode showed a low Tafel slope as 54 mV dec −1 and a current density of 400 mA cm −2 at an overpotential of -300 mV in hydrogen evolution reaction (HER). In addition, due to the metal flexibility of the Cu mesh substrate, the MoS 2 –rGO Cu ternary self-supporting electrode can be bent or cut into any desired shape. Even shaped as an elongated one, curved "S", this self-supporting electrode still kept itself from any deformation when hydrogen bubbles were rapidly generated. Therefore, a strategy for green, simple, and low-cost self-supporting electrode was provided, which may increase the large-scale operation of the catalytic electrode in HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Luo Chen,Liu Huiqing,Zhou Song,Li Jingpeng,Li Xiang,Huang Yaowei
This study evaluated this thermal reaction behavior of oxidized and pyrolyzed oils containing diverse clay minerals by means of differential scanning calorimetry (DSC) technology. The catalytic role of various clay minerals for thermal reaction processes involving oxidized oil and pyrolyzed oil during in situ combustion (ISC) was investigated in conjunction with kinetic calculation methods as well. The results demonstrated that all four clay minerals could shorten its temperature region of oxidized oil low-temperature oxidation (LTO) stage, with the peak temperature during the LTO stage of oxidized oil containing montmorillonite being dramatically reduced. The catalytic role of montmorillonite and illite on oxidized oil is more powerful in the high-temperature oxidation (HTO) stage with higher peak heat flow. The Lewis acid sites within clay minerals affect free radical reactions within the crude oil pyrolysis process, and in situ reforming performance of 400°C pyrolyzed oils containing clay minerals is less effective, along with low heat release in the LTO stage. Clay minerals can considerably minimize the activation energy during thermal reaction of oxidized oil, contributing to the coke generation and conversion in the fuel deposition (FD) stage and boosting the success rate of the ISC procedure. The catalytic role of clay minerals in the oxidation and pyrolysis reactions of crude oil contributes to the prediction of fuel deposition and the expansion of the combustion front during ISC under diverse types of rock conditions.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Chinese Journal of Aeronautics
·
2025
·
IF 5.7
Jun LIU,Tianyu YANG,Yi XIAO,Qilong YAN,Yunlan SUN
To gain insight into the fine interfacial control mechanism exhibited by oxidant-coated Al powder to improve combustion performance, we prepared Al/AP and Al@AP composite fuels using ball milling and spray-drying technology. The thermal reaction characteristics, AP decomposition behavior, and decomposition reaction pathways of Al/AP and Al@AP composite fuels were investigated using thermal analysis and Ab Initio Molecular Dynamics (AIMD) calculations. Under the influence of fine interfacial control, the low-temperature decomposition heat release peak of AP was delayed by 25.5 °C, while the high-temperature decomposition peak was advanced by 36.2 °C, leading to an increase in the decomposition heat release of AP from 410.7 J/g to 1 068.7 J/g. Compared to the unclad structure, the apparent activation energy of AP in low-temperature decomposition increased, and slightly decreased during high-temperature decomposition in the Al@AP composite fuel. The physical model of AP decomposition shifted to the model with higher degrees of freedom and a faster diffusion rate, characterized by rapid bidirectional diffusion at the interface. Furthermore, due to fine interfacial control, the oxidation reaction pathway of Al has been altered, changing from the final products of AP decomposition (O 2 , Cl 2 , etc.) to the direct oxidation of AP decomposition intermediates (HClO, ClO 2 , etc.). This accelerated and strengthened the oxidation reaction process of Al. As a result of these performance improvements, the final combustion temperature of Al@AP in the Microcanonical Ensemble (NVE) system stabilized at 2 370 K, which is significantly higher than 1 400 K observed for Al/AP, indicating enhanced ignition and combustion performance.
研究领域:
材料科学
·
化学工程
·
燃烧技术
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 10
·1598-1610
·
IF 1.887
Xiaoxia Ma,Xi Chen,Yuxiang Li,Zhiqiang Qiao,Guangcheng Yang,Kaili Zhang
The afterburning effect of aluminized explosives makes them have strong damage ability to soft targets, but the aluminum particles in the composition often cannot achieve proper combustion. The high ignition temperature of micron aluminum powder is one of the main reasons. In this work, we introduce nanothermite reaction with low onset temperature (<660 °C) into aluminized explosives by replacing the base explosives with energetic coordination polymers (ECPs). The decomposition products of many ECPs contain corresponding metal oxides that will react with aluminum via thermite reaction. Three kinds of ECPs ([CoC 2 H 4 N 8 O 4 ] n , [NiC 2 H 4 N 8 O 4 ] n and [CuC 2 H 4 N 8 O 4 ] n ) are constructed and compounded with nano-aluminum (nano-Al) particles to form aluminized ECPs. The influence of metal ion species and Al/Metal (Al/Me) molar ratio on their energetic properties are systematically studied. The results show that the exothermic thermite reaction with low onset temperature plays an important role in the combustion propagation of aluminized ECPs, and the possible mechanism is proposed. When the Al/Me molar ratio is 3–4, the aluminized ECPs have the best peak pressure and pressurization rate. At the optimum molar ratio, the pressure and pressurization rate of aluminized ECP(Co) are much higher than those of aluminized ECP(Ni) and ECP(Cu). Among the three kinds of aluminized ECPs, the aluminized ECP(Co) has the best energetic characteristics and can be used as a preferred choice. However, for the applications that require a long-time heat supply, aluminized ECP(Cu) will be suitable.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hui Zhou,Songtao Zhong,Ming Shen,Jianhua Hou,Wuxia Chen
Herein, we fabricate a Bi/Bi 2 O 2 CO 3 heterojunction via one-pot in situ deposition of Bi nanoparticles on Bi 2 O 2 CO 3 nanosheets , using formamide both as a carbon/alkali source and a reductant and demonstrate that the content of Bi in Bi/Bi 2 O 2 CO 3 composites can be tuned by adjusting the hydrothermal reaction time. Systematic characterization and analysis of as-prepared composites revealed that the initial in situ growth of Bi nanoparticles on BiOCOOH (an intermediate formed during the decomposition of formamide) was followed by the reaction of BiOCOOH with CO 3 2− to afford Bi 2 O 2 CO 3 nanosheets. The photocatalytic activity (PCA) of Bi/Bi 2 O 2 CO 3 was evaluated by degradation of rhodamine B (RhB) under simulated solar light irradiation, and the best result (99.61% degradation efficiency after 50-min irradiation) was observed for the photocatalyst obtained after 12-h hydrothermal treatment. The enhanced photocatalytic performance was ascribed to visible-light harvesting and electron-hole separation efficiency improvements caused by the surface plasmon resonance of Bi nanoparticles. Moreover, the developed photocatalyst displayed high photochemical stability and reusability during ten photocatalytic cycling runs and was therefore concluded to be well suited for practical wastewater purification applications. Thus, this work provides a new and facile method of utilizing non-noble Bi nanoparticles to optimize the PCA of semiconductor materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Lijun Liao,Haochen Zhang,Wenyao Li,Xiaojuan Huang,Zhiyin Xiao,Kaibing Xu,Jianmao Yang,Rujia Zou,Junqing Hu
CuCo 2 O 4 maguey-like nanowires were obtained via a facile hydrothermal reaction and subsequent annealing at 300 °C for 3 h. The CuCo 2 O 4 nanowires interacting with each other to form CuCo 2 O 4 maguey-like nanowires structure offers the great specific surface area, excellent electron and ion transfer ability, easy approach for electrolyte transmitting to electrode surface. Our prepared CuCo 2 O 4 electrode materials showed a high areal capacitance of 3.27 F cm −2 at 5 mA cm −2 , an outstanding specific capacitance of 982 F g −1 at 1.5 A g −1 and an excellent capacitance retention of 100.94% after 3000 circles at 50 mV s −1 . In addition, a symmetry supercapacitor was been assembled with a high energy density of 16.87 Wh kg −1 , a high power density of 8.2 kW kg −1 and outstanding cycle life, which demonstrates that our prepared material has great potential application for supercapacitors.
研究领域:
材料科学
·
电化学
✓ 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）