FUEL
·
2024
·
IF 6.7
Jing Li,Xiaorui Yan,Yujing Ren,Tiantian Liu,Kairui Li,Haisheng Wei
Design of metal Co-based catalysts by different strategies has aroused many attentions in the chemoselective hydrogenation of nitroarenes to improve their catalytic performance. Herein, Co(6)-N-C catalyst with highly dispersed metal Co and Co-N species was synthesized by the assistance of formed Zn species, which exhibits better performance than single atom Co catalyst in the selective hydrogenation of 3-nitrostyrene, in which the increasing of hydrogenation activity is usually accompanied by unsatisfactory selectivity. In this work, Co(6)-N-C catalyst obtains 98.5 % conversion and > 99 % selectivity of 3-vinylaniline, as well as excellent cyclic stability and desirable substrate universality for the hydrogenation of other substituted nitroarenes. It is demonstrated that the good performance is ascribed to the synergy of metallic Co and Co-N species in the Co(6)-N-C catalyst, improving the activity and selectivity. This work provides a novel strategy to construct an efficient Co-based catalyst for enhanced hydrogenation performance.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 35
·25247-25255
·
IF 3.9
Ruina Xuan,Jieqiong Mo,Jiwen Chen,Yixin Dou,Xiaofang Li,Zhuo jiang,Bo Chai,Chunlei Wang,Deng Ding,Juntao Yan,Xiaobo Wang
Photocatalytic CO2 reduction into value-added chemical fuels using sunlight as the energy input has been a thorny, challenging and long-term project in the environment/energy fields because of to its low efficiency. Herein, a series of CdS/Co-BDC composite photocatalysts were constructed by incorporating CdS nanoparticles into Co-BDC using a dual-solvent in situ growth strategy for improving photocatalytic CO2 reduction efficiency. The composites were characterized through XRD, SEM, TEM, XPS, DRS and EPR techniques in detail. 18% CdS/Co-BDC composites showed superior performance for the photocatalytic CO2 reduction to CO, which was 8.9 and 19.6 times higher than that showed by the pure CdS and Co-BDC, respectively. The mechanism of enhanced photocatalytic CO2 reduction performance was analyzed. The CdS/Co-BDC composites showed better adsorption for CO2. Detailed analysis of XPS, transient photocurrent responses, and electrochemical impedance spectroscopy (EIS) shows the existence of strong charge interaction between CdS and Co-BDC and the photo-electrons of CdS can be transferred to Co-BDC. Additionally, Co-oxo of Co-BDC plays the role of a redox-active site and promotes the reduction performance via the method of valence transition of Co(II)/Co(III) redox.
研究领域:
环境科学
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能源科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wenhui Li,Xiaowa Nie,Hong Yang,Xiang Wang,Felipe Polo-Garzon,Zili Wu,Jie Zhu,Jianyang Wang,Yi Liu,Chuan Shi,Chunshan Song,Xinwen Guo
Efficient conversion of CO 2 is of great significance for sustainable supply of chemicals and fuels. While Co-based catalysts are known to be effective for CO hydrogenation in Fischer-Tropsch synthesis, they work very differently in CO 2 hydrogenation. This study reveals a crystallographic dependence of reaction pathways for CO 2 hydrogenation on Co catalyst showing a new type of structure sensitivity and structure-activity-selectivity relationship for CO 2 conversion to chemicals and fuels. The experimental work on CO 2 conversion including steady-state isotopic transient kinetic analysis (SSITKA) using 13 C-labeled CO 2 shows a preferential CH 4 formation over HCP-Co but dominant CO formation over FCC-Co. The density functional theory calculations indicate that CO 2 does dissociate directly into chemisorbed CO* and O* on both HCP-Co and FCC-Co, but the CO* intermediates on HCP-Co prefer to be hydrogenated to form CH 4 whereas the CO* on FCC-Co preferentially desorb to form CO. The significantly altered adsorption strength of CO* due to the presence of chemisorbed O* and CO 2 * species on the catalyst surface is responsible for the mechanistic disconnection in product selectivity between the CO 2 and CO hydrogenation over Co catalysts. This study also shows that the addition of K to Co diminishes the direct impact of Co crystal structure, but improves the selectivity to C 2 + hydrocarbons along with higher CO 2 conversion. This seems to result from another pathway originating from HCOO* intermediate from bonding interaction of surface Co atoms with carbon in CO 2 , leading to the formation of CH x * whose coupling subsequently give rises to C 2 + products. The present study sheds new light into the crystallographic structural sensitivity of CO 2 hydrogenation towards the rational design of more selective catalysts for CO 2 conversion.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Hong Zhao,Yuqi Yang,Man Zhou,Lihui Xu,Hong Pan,Qun Yang,Zaisheng Cai
Anti-fog glass can solve the safety problems caused by glass fogging in a wide range of applications. However, its durability is still insufficient under actual application conditions such as high humidity, friction and scratches, et al. Therefore, this work copolymerised hydrophilic chain segments N-hydroxyethyl acrylamide (HEAA) containing -OH and water-resistant -NH-CO-, hydrophobic chain segments butyl acrylate (BA) and a “bridging agent” 4-benzoylphenyl acrylate (BPA) into a trimeric anti-fog coating. And, -OH was introduced to the glass surface by a simple plasma treatment. The BPA was covalently linked with hydrophilic and hydrophobic polymers HEAA/BA through a free-radical polymerisation reaction of double-bonded to form a covalent carbon chain. Meanwhile, it covalently combined with the -OH on the glass surface. BPA formed a stable link between the anti-fog coating and the glass substrate. Thus, the coating was resistant to 400 cycles of sand abrasions and can lift up to 1500 g. The -NH-CO- in HEAA and BA significantly increased the water resistance of the coating which can be immersed in water for 120 h. The -OH in HEAA not only given the coating excellent anti-fogging properties, but also enabled it to self-heal quickly within 10 s. The durable anti-fog coatings prepared in this work have great potential for practical applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2019
·Vol. 28
·期 11
·957-967
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IF 1.707
Yang Xiaoli,Wang Kunyan,Yan Lei,Yu QiNing,Xia Hongxia,Liu Yanbo,Yan Chengjun
Multi-stimuli-responsive hydrogels are being increasingly studied due to their sensitive response to small stimuli and wide applications in biosensors and drug delivery. In this study, a multi-stimuli-responsive hydrogel, poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone- co -methacrylic acid- co - N -isopropylacryl amide) [poly(HEMA- co -NVP- co -MAA- co -NIPA)], was synthesized by radical polymerization and characterized by Fourier transform infrared (FTIR) and 13 C NMR spectroscopy techniques. With the aids of scanning electron microscopy (SEM) characterization, it was confirmed that the sensitive stimuli-responsive behavior of the hydrogel stemmed from its microstructure variation with those external stimulus. Rheological study showed that the hydrogel had rheological feature of typical elastomer. Compression tests revealed that the poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone) [poly(HEMA- co -NVP)] played an important role in enhancing the compressive modulus of such hydrogel. More interestingly, the equilibrium swelling ratio (ESR) studies further confirmed that the composite hydrogel displayed response sensitively to the stimulus of temperature, pH, and ionic strength. Herein, theophylline as a drug model was adopted due to the multi-stimulus properties of hydrogels, which were a potential candidate for drug loading and delivering. Releasing drug continuously in a given period was dependent on the characteristics of solution and loading time. The mechanisms for drug release from the hydrogels were studied by Ritger–Peppas model.
研究领域:
材料科学
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生物医学工程
·
药剂学
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2014
·Vol. 55
·期 1
·223-230
·
IF 1.441
Zhao-Xia Li,Man-Geng Lu,Kun Wu,Yun-Fei Zhang,Lei Miao,Yin-Wen Li,Hui-Long Guo,Jian Zheng
A series of novel thermosensitive macroporous poly (ethylene glycol) (PEG)- co -poly( N -isopropylacrylamide) (PNIPAAm)- co -poly (ε-caprolactone) (PCL) hydrogels were synthesized via in situ free radical polymerization. Poly(ethylene glycol diacrylate) (PEGDAc) and poly(ε-caprolactone diacrylate) (PCLDAc) were prepared as macrocrosslinkers. All compounds were investigated by Nuclear Magnetic Resonance (NMR) and Fourier transform-infrared spectroscopy (FT-IR). Differential Scanning Calorimetry (DSC) results showed the lower critical solution temperatures (LCSTs) of the gels were at around 31°C. The macroporous gels not only had considerable swelling ratios, but also exhibited rapid swelling kinetics and response sensitivity. Above mentioned hydrogels showed a remarkable oscillatory swelling–deswelling transition, making them have potential application in long-term drug delivery. POLYM. ENG. SCI., 55:223–230, 2015. © 2014 Society of Plastics Engineers
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3174-3183
·
IF 2.3
Xia Qing,Qin Haijian,Xia Feifei,Yao Pengfei,Zheng Chunzhi,Zhao Songjian,Zhang Huabing,Yang Fengli
CO oxidation at mild condition is significant for industrial process but still challenging nowadays, especially for the non-noble metal catalysts. The preparation method significant affect the catalytic activity of the catalyst. Comparing with cobalt supported on tantalum oxide prepared by impregnation method, Co/Ta 2 O 5 prepared by deposition–precipitation method with urea in this study has smaller particle size, higher specific surface area and better redox properties, and these features make the catalyst exhibit higher catalytic activity for CO oxidation at mild condition. 90% CO conversion was achieved at 130 ℃, and CO was fully converted at 150 ℃. The XPS and DRIFTs results show that Co/Ta 2 O 5 has more oxygen vacancies, and the absorbed CO will react with oxygen. The study may provide a new thought for the preparation of catalysts with high activity at mild condition. Graphical
Co/Ta 2 O 5 prepared by deposition–precipitation with urea catalyzes the oxidation of CO
研究领域:
催化
·
材料科学
·
环境化学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Shuang Liu,Limin Ma,Cheng Zhen,Yishu Wang,Dan Li,Fu Guo
In advanced microelectronic packaging technology, the interfacial brittleness of Cu/Sn solder joints puts forward higher requirements for high-performance diffusion barriers. Cobalt–Phosphorus (Co-P) alloy coating becomes ideal candidates for its good wettability and diffusion resistance. In this work, for Co-P with different crystallinity , the barrier properties of electrodeposited Co-P coatings as well as the mechanical properties of Co-Sn intermetallic compounds (IMCs) at the Co-P/Sn-Ag interface were investigated. According to the XRD results, the crystallinity of the Co-P coating was directly related to the phosphorus (P) content, and Co-P were classified into three types: crystalline state, mixed state and amorphous state. The morphology, composition, phase characterization, and mechanical properties of the Co-Sn IMCs at the interface were investigated by SEM , EPMA , TEM , and nanoindentation methods, respectively. After 180 °C aging test for 120 h, the thickness of CoSn 3 generated at the interface of crystalline Co-4.2 at.% P/Sn-Ag was the smallest among a total of 18 Co-P coatings, where P content ranged from 0.9 at.% to 20.8 at.%, showing the best barrier properties. The hardness of (Co,Cu)Sn 3 at the amorphous Co-P/Sn-Ag interface was the lowest (3.2 GPa), which was only 47% of that of Ni 3 Sn 4 , exhibiting the lowest brittleness tendency. The mixed crystalline-amorphous Co-P could greatly improve the diffusion barrier properties while sacrificing a small degree of brittleness comparing to the amorphous coatings, and had the potential to become a general-purpose alloy coating. This work could provide a scientific basis for the selection of Co-P barrier layers with excellent barrier properties and mechanical properties leading to different application scenario in electronic packaging.
研究领域:
材料科学
·
微电子封装技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jun Lu,Mingyue Xia,Jing Liang,Lie Zou,Xiaolong Liang,Yan Gao,Fei Li,Junfeng Gao,Jinxuan Liu
Cu 2 Y 2 O 5 with asymmetric atomic distance distribution was investigated for the first time in CO 2 electroreduction reaction (CO 2 RR). The high electrophilicity of Y not only regulates the electronic structure of Cu, but also acts as an electron dock to attract CO*, promoting its toward Y and effectively protecting the stability of Cu 2+ during the reduction process. In a Flow cell, CYO-850 achieves an exceptionally high selectivity of 70 % for ethylene, accompanied by a high partial current density of 200 mA cm −2 . In-situ infrared spectroscopy and density functional theory results indicate that interaction between Cu and Y promotes the dimerization of *OCCO intermediates and directs the CO 2 reduction pathway towards ethylene. This is the first report on the use of Y element in the field of CO 2 reduction.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
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
NANO
·
2016
·
IF 0.951
Jingge Liu,Ang Cao,Jing Si,Lihong Zhang,Qinglan Hao,Yuan Liu
Sintering of the active metallic nanoparticles and carbon deposition are the key problems faced for CO methanation catalysts. For overcoming those problems, bimetallic nanocatalyst is a promising route. In this work, a series of Al 2 O 3 supported Ni-Co alloy catalysts were prepared by reducing NiCoAl layered double hydrotalcite (LDHs), and characterized with X-ray diffraction (XRD), temperature programmed reduction TPR, N 2 adsorption-desorption, transmission electron microscopy (TEM) and temperature programed oxidation (TPO) techniques. The resultant catalysts were mesoporous with nanoparticles of Ni-Co alloy ranging from 7.9 nm to 9.2 nm which were highly dispersed in alumina matrix. The sample Ni 7 Co 3 -Al 2 O 3 catalysts showed very good catalytic performance during the stability test at 500/600 ∘ C for 300 h, meanwhile exhibited excellent anti-sintering ability and anti-carbon deposition ability, owing to the formation of Ni-Co alloy and the feature of LDHs. This strategy for improving anti-sintering and anti-carbon deposition should be extendable for catalysts of other reactions.
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
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Lei Liu,Ning Liu,Chengna Dai,Ruinian Xu,Gangqiang Yu,Ning Wang,Biaohua Chen
Realizing MoS2 basal plane activation is highly desirable and challenging in the field of hydrodesulfurization (HDS). Herein, we have developed a new strategy of dual Co single atom doping (SAD) combined with CO in situ regulation, which can successfully activate the basal plane of Co3.6%–MoS2-0.3 generating high ratios of thermostable 1T-plane (∼70%) and large S vacancies. For the first time, a synergistic effect has been unraveled where the lattice substituted neighboring dual SA Co can efficiently activate in-plane S through extensively reducing its band gap (2.21 → 0.14 eV), which tremendously favors S subtraction and 2H → 1T phase transition assisted by CO. Boosted thiophene HDS activity can be eventually achieved with the reaction rate constant (k) being 8.3 times higher than that of commercial cCo3.6%–MoS2 (0.04 → 0.33 h–1). Generally, the present work paves a new way for next-generation HDS catalyst design with activated basal plane.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）