Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120116
·
IF 7.2
Wujian Zhang,Yongchao Zhao,Jidong Wang,Kangjun Wang,Hangjia Shen,Zongjian Liu,Wenfeng Han,Ying Li,Aimin Chen,Haodong Tang
The dehydrofluorination of 1,1-difluoroethane (R152a) is a Lewis acid–catalyzed reaction in which both catalytic activity and stability are governed by the coordination and acidity of aluminum sites. In this work, a mechanochemical fluorination strategy was developed to construct a partially fluorinated Al-based catalyst with tunable acid properties. By controlling the fluorine-aluminum ratio during ball milling, the in situ formation of AlF 2 (OH) was achieved, serving as a structural stabilizer and electronic modulator. The coexistence of F-Al-O units and unsaturated Al centers provides medium-strength Lewis acid sites, which favor selective C-F bond activation while suppressing side reactions. Comprehensive characterizations (XRD, XPS, 27 Al NMR, and NH 3 -TPD) confirmed that the defect-related F-Al-O structure maintains structural integrity and balanced acidity during reaction. Consequently, the optimized catalyst exhibits excellent activity, selectivity, and long-term stability in R152a dehydrofluorination.
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Ruobing Wang,Hongli Zheng,Changfu You,Haiming Wang
Chemical looping reforming of methane (CLRM) is a promising technology for syngas production, offering efficient utilization of CH 4 to generate syngas with a desirable H 2 /CO ratio for downstream applications. This study investigated the influence of Ni incorporation in Y-Fe-Al garnet-type oxygen carriers (OCs) in CLRM. The Ni 0.2 -Y-Fe-Al OC demonstrated a pronounced enhancement in performance compared to its undoped counterpart, elevating the methane conversion from 66.6 % to 98.4 % and increasing the syngas yield from 5.79 to 8.38 mmol g −1 at 850 °C. The incorporated Ni species introduced additional active sites for methane activation, enhanced surface basicity, and improved lattice oxygen mobility, which collectively facilitated the selective oxidation of methane to syngas, especially at low temperatures (<850 °C). Cyclic tests confirmed that Ni incorporation enhanced the redox stability and mitigated phase segregation, leading to sustained high reactivity over multiple cycles. In situ DRIFTS analysis verified that the fundamental reaction pathway, proceeding via the -CH 3 →-CH 2 →-CHO intermediates, remained unaltered after Ni addition. This work established that incorporating Ni in garnet-type OCs is an effective strategy for enhancing both redox activity and cyclic stability in CLRM systems.
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产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 3
·035507
·
IF 1.62
Shi Li,Tao Guo,Miao Yao,Wen Ding,Jialin Chen,Jiaxing Song,Sheng Zhang,Rui Zhu
To study the effect of the addition of potassium perchlorate (KClO4) on the performance of nano thermites, Al/Bi2O3 nano thermites with different mass fraction (wt%) of KClO4 was made by ultrasonic dispersion method. Then, all samples were tested by SEM, DSC and rapid excitation ignition. DSC results showed Al/Bi2O3/10 wt%KClO4 had the highest heat release. Compared with Al/Bi2O3, the heat release increased by 28.32%. The results of activation energy calculations showed Al/Bi2O3/30 wt%KClO4 had the lowest activation energy (Ea). Its activation energy was reduced by 30%, mere about 149.17 KJ mol−1. Finally, it can be seen from the combustion situation that the addition of KClO4 reduced the intensity of burning. This work found a way to increase the heat release or reduce the activation energy of nano thermites by controlling the amount of KClO4 added.
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高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 8
·086472
·
IF 1.449
Zhengjun Shen,Yannan Zhang,Xiaohua Yu
The interfacial microstructure of an Al-based coating on a Ti alloy surface has been designed by using phase diagrams and advanced first-principles calculations. Samples were characterized by x-ray diffractometry, scanning electron microscopy, optical microscopy, high resolution transmission electron microscopy and energy-dispersive spectrometry. The results show that the stability sequence of the Ti–Al intermetallics was Ti3Al > TiAl > TiAl2 > TiAl3. The TiAl3 transition layer with a strong self-healing property was obtained easily by metallurgical reaction of Al and Ti. The Al atoms in TiAl3 combined rapidly with the O atoms to form a new Al2O3 protective layer in air. This work provides theoretical support for the thermal processing of Ti alloys.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenwu Zhou,Jianyong Ye,Sheng Zhuo,Danxia Yu,Ping Fang,Rong Peng,Yue Liu,Weifan Chen
The pigments with high near-infrared (NIR) reflectance hold great promise toward both fundamental types of researches and applications for the realization of comfortable indoor-temperature by mitigating urban heat island effect. However, the facile yet simple method for the NIR reflective pigments with bright color and non-toxic feature remains a huge challenge, limiting their practical application. Herein, we proposed a mild and universal method of solution combustion for constructing the non-toxic and NIR reflective yellow-green pigments of Al-doped Y 3 Fe 5 O 12 . The Y 3 Fe 4 AlO 12 pigment presented a high NIR reflectance of 87.66%, and an outstanding acid/alkali resistance. Moreover, the pigment had an impressive color performance (L* = 78.72, a* = − 4.05, b* = 40.04). Besides, the practical near-infrared reflection performance revealed that the transient surface temperature of the Y 3 Fe 4 AlO 12 pigment was 7.6 °C lower than that of the pigment with similar color on the market. This research supplied high NIR reflecting pigments of Y 3 Fe 5−x Al x O 12 as promising coatings for roofs and exterior walls of buildings, acting as a favorable solution for urban heat island effect.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jianmeng Chen,Yijing Xia,Qizhou Dai
This study presents an electrochemical method for the degradation of chloramphenicol (CAP) in aqueous solution with a novel Al doped PbO 2 electrode. The Al-doped PbO 2 electrode showed high electrochemical activity, oxygen evolution potential, radical utilization rate, reusability and safety. The influence factors on CAP degradation with the Al-doped PbO 2 electrode were investigated in detail, and under the optimal conditions the removal rates of CAP and TOC reached 87.30% and 52.06% in acid conditions after 2.5 h electrolysis with a 0.2 mol dm −3 Na 2 SO 4 at a current density of 30 mA cm −2 , respectively. The electrochemical degradation of CAP at Al-doped PbO 2 electrode electrode followed pseudo-first-order kinetics. The degradation mechanism was proposed by cyclic voltammograms tests and it was deduced that hydroxyl radicals generated in the electrochemical process played a key role in oxidizing CAP. Finally, based on the reaction products identified, a possible degradation pathway including radical reaction, ring open and mineralization was proposed.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Zijin Yang,Xianying Qin,Kui Lin,Qiuchan Cai,Yongzhu Fu,Baohua Li
In recent years, lots of efforts have been applied to improve the initial Coulombic efficiency (ICE) of lithium-ion batteries (LIBs), among which prelithiation is considered to be one of the most promising schemes. Here we report a modified Li x Si with high lithium reserves and great environmental adaptability as the prelithiation reagent, which can make up for the capacity loss of the negative electrode in the first cycle. Through the chemical reaction between aluminum isopropoxide and Li x Si, a protective layer consisting of Li x Al y SiO z /Li 2 O is formed on the surface of Li x Si particles. This synthesized material provides a new idea for the actual industrial production of prelithiation.
研究领域:
材料科学
·
电化学
·
电池技术
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Xiaoli Feng,Haifeng Wang,Xuechao Liu,Canming Wang,Hongzhi Cui,Qiang Song,Kun Huang,Neng Li,Xue Jiang
Inconel 625 + x Al ( x = 0, 2.5, 5.0, 7.5, 10.0) alloy coatings were prepared by laser cladding. The addition of Al promoted the formation of the BCC phase, which changed the coating microstructure from an FCC + δ phase + Laves phase to FCC + BCC + δ phase + Laves phase. Inconel 625 + 2.5 Al alloy showed the greatest corrosion resistance among all samples. The formation of an Al 2 O 3 film improved the corrosion resistance of the coating, but excess Al decreased the Cr 2 O 3 content in the film, which decreased the corrosion resistance of the coating. Increasing the Al content aggravated the lattice distortion and improved the solid solution strengthening effect, while also increasing the amount of BCC phase, which improved the coating hardness. After adding Al, the Inconel 625 + x Al alloy coatings displayed strong plastic deformation resistance, and their wear resistance was improved due to the presence of a hard phase.
研究领域:
材料科学
·
表面工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ruixin Yan,Xiuping Feng,Long Kong,Qun Wan,Weilin Zheng,Takeshi Hagio,Ryoichi Ichino,Xinde Cao,Liang Li
Hexavalent Chromium (Cr(VI)) in water is a public health concern and has been a challenging research subject in environmental field for many years. Herein, a novel composite material consisting of amorphous iron sulfides supported on hydrotalcites (FeS/HTs) was synthesized by “calcination-reconstruction-calcination” process, which enables homogeneous distribution of iron and sulfur on the surface of hydrotalcites (HT). The composite (mass ratio of FeS/HT was 1/2) could effectively remove over 98% of Cr(VI) within 10 min. A pseudo-second-order kinetic model and a Langmuir isotherm model were well fitted the sorption data with a maximum removal capacity of 206.2 mg/g. The superior adsorption capacity of FeS/HTs could be attributed to the combination of the advantages of abundant adsorption sites on HT and powerful reduction properties of iron sulfides. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis suggested the adsorbed Cr(VI) on the surface and interlayer of FeS/HTs had been reduced to Cr(III) by reductant iron and sulfur. This study demonstrated that FeS/HTs has potential application prospects in Cr(VI) removal.
研究领域:
环境科学
·
材料科学
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 5
·2291-2300
·
IF 10.733
Xin Wang,Hui Li,Han Li,Shuai Lin,Jin Bai,Jianming Dai,Changhao Liang,Xuebin Zhu,Yuping Sun,Shixue Dou
An energy storage system based on a battery-type electrode and a capacitive electrode as a hybrid supercapacitor offers a promising way to construct devices with advantages of both rechargeable batteries and carbon-based supercapacitors. NiCoAl-LDH nanosheets uniformly grow onto micron-scaled MXene sheets to form a NiCoAl-LDH/V4C3Tx heterostructure with three-dimensional interconnected porous network microstructures by a hydrothermal method. NiCoAl-LDH/V4C3Tx composite electrodes show an excellent specific capacity of 627 C g−1 at a current density of 1 A g−1 in 1 M KOH. Especially, the NiCoAl-LDH/V4C3Tx electrodes exhibit a specific capacity of 300 C g−1 even at a high current density of 20 A g−1 in 1 M KOH, showing excellent rate performance. Hybrid supercapacitors, constructed with NiCoAl-LDH/V4C3Tx as the battery-type electrode and activated carbon (AC) as the capacitive electrode, show superior energy densities of 71.7 and 45.0 W h kg−1 at power densities of 830 and 20 000 W kg−1 in 1 M KOH, respectively. The excellent capacity retention rate is 98% for the hybrid device after 10 000 cycles at 20 A g−1 in 1 M KOH. The NiCoAl-LDH/V4C3Tx heterostructures can be used as promising electrode materials for low-cost hybrid supercapacitor devices.
研究领域:
材料科学
·
能源存储技术
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 16
·8668
·
IF 5.924
Jie Li,Shiyi Wang,Huayin Li,Yuan Tan,Yunjie Ding
The synthesis of ester compounds is one of the most important chemical processes. In this work, Zn-Mg-Al mixed oxides with different Zn2+/Mg2+molar ratios were prepared via co-precipitation method and supported gold nanoclusters to study the direct oxidative esterification of aldehyde and alcohol in the presence of molecular oxygen. Various characterization techniques such as N2-physical adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and CO2temperature programmed desorption (TPD) were utilized to analyze the structural and electronic properties. Based on the results, the presence of small amounts of Zn2+ions (~5 wt.%) provoked a remarkable modification of the binary Mg-Al system, which enhanced the interaction between gold with the support and reduced the particle size of gold. For oxidative esterification reaction, the Au25/Zn0.05MgAl-400 catalyst showed the best performance, with the highest turnover frequency (TOF) of 1933 h−1. The active center was believed to be located at the interface between metallic gold with the support, where basic sites contribute a lot to transformation of the substrate.Keywords:gold catalyst;cluster;hydrotalcite;oxidative esterification;methyl isobutyrate
研究领域:
化学工程
·
催化材料
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaomin Kang,Guodong Fu,Fengzhan Si,Xiaohui Deng,Lei Wang,Xian-Zhu Fu,Jing-Li Luo
Porous boron-bearing Fe-nitrogen doped carbon electrocatalysts (Fe-BNC) are prepared by pyrolysis treatment of Fe/B co-doped zeolitic imidazolate frameworks (ZIFs). The as-obtained Fe-BNC catalysts with a high surface area (1300 m 2 g −1 ) favor a 4-electron reduction pathway for efficient oxygen reduction reaction (ORR). The Fe-BNC catalysts demonstrate a half-wave potential of ∼0.85 V vs RHE comparable to that of Pt/C catalyst and high stability in 0.1 M KOH. The dopant of little boron and iron into nitrogen-doped carbon results in the high surface area, enhanced surface polarities, electronic properties and exposing more active sites to introduce a synergistic effect for enhanced ORR performance. Moreover, Fe-BNC electrocatalysts used as air cathode for Al-air batteries exhibit a high peak power density of 195.2 mw cm −2 and excellent stability even after discharging for 24 h at room temperature , revealing an excellent performance in application of metal-air batteries and other energy converting devices.
研究领域:
材料科学
·
电化学
·
能源转换设备
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高影响因子
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