BIOMASS & BIOENERGY
·
2024
·
IF 5.8
Yong Liu,Jirong Long,Zhijiao Huang,Lungang Chen,Chenguang Wang,Xinghua Zhang,Longlong Ma
Direct production of 2,5-dimethylfuran (DMF) from fructose is crucial for developing biomass-derived fuels, yet it presents significant challenges due to the need for multifunctional active sites for dehydration and hydrodeoxygenation. Meanwhile, the disposal of wine lees, a major winemaking by-product, incurs substantial costs. Herein, a hybrid catalyst system of sulfonated wine lees carbon (WLC-SO 3 H) and PtFe/C was introduced, achieving a DMF yield of 66.4 % directly from fructose. WLC-SO 3 H, with enhanced Brønsted acidity, demonstrated high activity in dehydrating fructose to 5-hydroxymethylfurfural (HMF) with a 98.2 % yield. PtFe/C effectively catalyzed the hydrodeoxygenation of HMF to DMF, driven by the strong interaction between Pt and Fe species. This interaction was confirmed through in situ DRIFTS and theoretical calculations, highlighting the system's superior catalytic performance.
研究领域:
化学工程
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催化
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可再生能源
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生物质转化
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 11
·15174-15181
·
IF 4.672
Yang Liu,Xuesong Cai,Dinggui Chen,Yan Qin,Yuan Chen,Jinxiang Chen,Chenglu Liang
Summary The large-scale applications of energy storage system via lithium-ion batteries (LIBs) put forward demands for high capacity, high safety, and low cost of materials. Covalent organic polymers have attracted extensive attention because of their high capacity, flexible structural design, high safety, abundance, and low cost. Here, 2,3,5,6-tetraamino-p-benzoquinone and hexaketocyclohexane octahydrate were chosen as monomers to construct the covalent organic framework (TH-COF) cathode materials with active C=O and C=N groups. The TH-COF was further composed with reduced graphene oxide (rGO) and the prepared TH-COF/rGO cathode provided a capacity of 135 mAh g −1 after 600 cycles at 1 C current density. In addition, after 100 cycles, the cathode delivered capacities of 118 and 73 mAh g −1 at the high current densities of 5 C and 20 C, respectively, displaying superior rate performances. The TH-COF/rGO electrode exhibited high capacity and stability, making it a promising cathode material for the next generation LIBs.
研究领域:
材料科学
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能量存储
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电化学
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DOI
高影响因子
TETRAHEDRON
·
2020
·
IF 2.233
Xianxia Tu,Haiyun Peng,Guisheng Deng
In Ph 3 PAuCl/AgOTf/TsOH system, 2-diazo-5-alkynyl-1,7-diketo carbonyl compounds were transformed into diazo furans . Rh 2 (OAc) 4 -mediated conversion of the diazo furan derivatives into 4 H -cyclopenta[ c ]furan-5(6 H )-one derivatives was accomplished via C(sp 2 )−H insertion reaction at 4-position on the furan ring.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
·
IF 5.302
Zhenxiao Tang,Maozhong Yi,Qiuling Xiang,Yuhui Du,Ke Peng
An improved high-solid-loading slurry impregnation process was developed to introduce HfB 2 particles into a low-density C/C preform efficiently, and precursor infiltration and pyrolysis process was used for densification to obtain a C/C-HfB 2 -SiC composite. The microstructure characterization revealed that HfB 2 particles uniformly filled the pores in the C/C preform, and SiC well densified the interstices between HfB 2 particles and the small pores in the carbon fiber bundles. After being tested, the C/C-HfB 2 -SiC composite had a density of 4.07 g/cm 3 and a bending strength of 344.8 MPa, and exhibited a non-brittle fracture behavior. After ablation with oxyacetylene flame at 2500 ℃ for 120 s, the mass ablation rate and linear ablation rate of the C/C-HfB 2 -SiC composite were 0.5 mg/s and 0.415 μm/s, respectively. The good ablation performance is attributed to the hindering effect of the HfO 2 scale on oxygen diffusion at high temperature.
研究领域:
材料科学
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航空航天工程
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产品关联
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2020
·Vol. 151
·期 1
·99-106
·
IF 1.349
Li Nutao,Chen Feng,Wang Guanghui,Zeng Qingle
Abstract A ligand-free copper-catalyzed C–P cross-coupling reaction of arylmethyl quaternary ammonium salts and diarylphosphine oxides in air is developed. Arylmethyl quaternary ammonium salts with various functional groups and a variety of dialkyl- and diarylphosphine oxides afford C–P cross-coupling products with good yields. This protocol requires no inert atmosphere, no ligand, and simple operation steps. Graphic abstract
研究领域:
有机化学
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合成化学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Haibo Ouyang,Yulei Zhang,Cuiyan Li,Guibiao Li,Jianfeng Huang,Hejun Li
C/C-ZrC-SiC composites were fabricated by carbothermal reaction of hydrothermal co-deposited oxides and resulted in homogeneous microstructure. The fracture behavior passed from pseudo-plastic to brittle fracture with the increase in ZrC/SiC molar ratios. The composites with a molar ratio of ZrC/SiC≈2:1 presented outstanding ablation resistance with a mass ablation rate of 0.06 mg cm −2 s −1 and a linear ablation rate of 0.13 μm s −1 . The optimal ZrC/SiC molar ratio provided a suitable balance of viscosity and flowability of the oxides scale, which not only possessed enough solid ZrO 2 to endure the scouring but also had moderate liquid-phase to seal the defects and limited the oxidation.
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Aolin Xie,Bei Zhang,Yichun Ge,Xiaodong Wang,Ping Xu,Zhirong Feng,Maozhong Yi,Zhe Zhou
To ensure the performance of C/C composites, a surface-modified C/C composite was prepared with a C/C composite as the substrate, one-dimensional SiC as the intermediate, and vertically oriented graphene as the modification material without changing the microstructure or composition of the C/C composites. C/C composite surface modifications were prepared in two steps. Its specific surface area is improved from 0.25 m 2 /g to 10.44 m 2 /g, and the electromagnetic interference shielding efficiency is enhanced from 13.08 dB to 23.86 dB. Different from the C/C composites without surface modification, the electromagnetic interference shielding mechanism of surface-modified C/C composites changed from electromagnetic reflection to the interaction of electromagnetic absorption and reflection. The reason is that the increased specific surface area elongates the transmission paths of the electromagnetic waves by multiple reflections, leading to significantly improved electromagnetic interference shielding efficiency.
研究领域:
材料科学
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电磁干扰屏蔽
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纳米材料
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jiaxing Hou,Guohao Zou,Xinrui Liu,Mingge Li,Pengyu Yang,Xiaobin Zhang,Yan Chen,Qian Zhang,Xiaoping Wu,Tiejun Wang
The one-step hydrothermal reconstruction of bioethanol into higher alcohols represents a pivotal advancement in green chemistry, addressing both environmental sustainability and energy regeneration. Herein, a rational design of Ni@C-CeO2 catalysts via a sol–gel method for efficient aqueous-phase ethanol C–C coupling was reported. Systematic investigation of Ni loading and precursor carbonization temperature revealed their critical roles in modulating catalyst microstructure and performance. The optimized Ni-2@C-CeO2-500 catalyst demonstrated exceptional activity under 190 °C and 12 h, achieving ethanol conversion of 72.0% and C4+ alcohol yield of 55.6%. Advanced characterization techniques unveiled structure-performance relationships: (1) controlled Ni loading ensured optimal nanoparticle dispersion, while excessive loading induced aggregation; (2) carbonization at 500 °C balanced carbon matrix architecture and CeO2 reducibility. XPS analysis revealed that oxygen vacancy concentration critically modulates strong metal–support interactions through Ce3+-induced charge redistribution, facilitating interfacial electron transfer during reaction. Furthermore, the Ni-2@C-CeO2-500 catalyst demonstrated excellent stability with sustained activity retention over five consecutive cycles. This work establishes a renewable and technologically viable alternative to conventional petroleum-derived chemicals widely utilized in the chemical industry, demonstrating significant potential for applications in green and sustainable chemistry.
研究领域:
绿色化学
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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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Chen Zeng,Mingyu Zhang,Hanwei He,Xiaodong Wang,Kai Tong,Yafeng Wang,Ping Xu,Lei Zheng,Guang Zeng,Zhean Su,Qizhong Huang
Sol-gel is a promising technology to prepare the C/C–ZrC–SiC composites. However, carbon fiber erosion caused by carbothermal reduction severely degrades properties of the composites. At present study, the addition order of carbon source during sol-gel process was optimized to improve the microstructure, mechanical property and ablation resistance of the composites. Results show that adding phenolic resin before gelation combined with deposited pyrocarbon interlayer around the carbon fibers can greatly alleviate the degradation of the C/C–ZrC–SiC composites by reducing the carbon fiber erosion. The composites thus prepared delivered the flexural strength , mass and linear ablation rates are 162.58 MPa, 0.147 mg/(cm 2 ⋅s) and 0.0098 mm/s, respectively, which are 449% higher, 9.26% lower and 38.36% lower than those of the counterpart that added phenolic resin after gelation. The excellent performance is attributed to little erosion of the carbon fibers and the dense matrix of ZrC–SiC ceramics obtained from adding carbon source before gelation during the sol-gel process.
研究领域:
材料科学
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复合材料
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Lin Dong,Jie Xia,Yong Guo,Xiaohui Liu,Haifeng Wang,Yanqin Wang
Efficient and selective cleavage of C aromatic -C linkages in lignin to enhance the productivity of monocyclic aromatic hydrocarbons is an extremely challenging and attractive task. Previously, we reported a Ru/NbOPO 4 catalyst that realized the catalytic cleavage of both interunit C-C and C-O bonds in one-pot lignin conversions [ Chem , 2019, 5, 1521–1536]. However, the roles of NbO x species in the selective C aromatic -C cleavage are not clear and need to be extensively studied. Herein, we focus on the exploration of the catalytic mechanisms of C aromatic -C bond cleavage over NbO x -supported Ru catalyst, by comparing with those of Ru/TiO 2 , Ru/ZrO 2 , and Ru/Al 2 O 3 catalysts. It shows that the Ru/Nb 2 O 5 catalyst exhibits high activity and remarkable selectivity to monocyclic hydrocarbons. A combined diffuse reflectance infrared Fourier Transform spectra (DRIFTS) and density functional theory (DFT) calculation analysis unambiguously confirmed that (i) NbO x not only can strongly adsorb phenylcyclohexane via benzene ring, but also selectively activate C aromatic -C bond between benzene ring and cyclohexane ; (ii) NbO x can promote the protonation of phenylcyclohexane with the assistance of H 3 PO 4 ; and (iii) NbO x can significantly reduce the barrier of C aromatic -C bonds cleavage of the carbocation intermediate (C 6 H 5 (H)C 6 H 11 + ). A detail underlying mechanism has been established, which would have further implications to promote the design of new, high efficient catalysts.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Shengnan Zhao,Song Song,Yong You,Yingtian Zhang,Wei Luo,Kaijie Han,Tong Ding,Ye Tian,Xingang Li
Heterogeneous photocatalytic C-C coupling is a green and efficient approach to producing valuable chemicals. The strategies for guiding effective photocatalyst design are desired but still limited. Here, we report visible-light-driven highly selective photocatalytic C-C coupling of benzyl alcohol over surfactant-modified Zn 3 In 2 S 6 semiconductors. A complete switch of product selectivity from benzyl aldehyde (91.5 %) to C-C coupling products (96.5 %) is obtained by the modification of Zn 3 In 2 S 6 with stearyl trimethyl ammonium bromide (STAB). This modification assists the formation of sulfur vacancies on Zn 3 In 2 S 6 to enhance charge carrier separation, thereby increasing the photocatalytic activity. The selectivity switch is mainly attributed to increasing conduction band position of Zn 3 In 2 S 6 by surfactant modification which strengthens the reduction ability of photogenerated electrons to induce the reversible reduction of benzyl aldehyde to ketyl radicals, and partially to the poor oxidation ability of the material that inhibits the oxidation of ketyl radicals to benzyl aldehyde. Encouragingly, this universal protocol has been successfully applied to a series of aromatic alcohols and biomass-derived furanic alcohols to selectively produce C-C coupling products.
研究领域:
化学
·
材料科学
·
光催化
·
环境科学
✓ 已验证
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Yulei Zhang,Binbin Ouyang,Yihan Chen,Wenli Zhang,Cuie Guang,Wei Xu,Wanmeng Mu
In this study, the second enzyme of esterase C family from Enterobacter hormaechei ( Enho -Ere) was identified. The optimum pH and temperature of Enho -Ere was determined at pH 7.0 and 50 °C. At the concentration of 0.8 g/L, 100% erythromycin (Ery), 100 % clarithromycin (Clr), and 50 % roxithromycin (Rox) were transformed by Enho -Ere. Based on transformed products (TPs), a hydrolysis-hydroxyl attack-dehydration reaction process was proposed. Firstly, the lactone ring in macrolides were hydrolyzed. The newly formed hydroxyl from hydrolysis then attacked the unsaturated bond at position C9 to generate the intermediate TPs. Finally, the dehydration happened between the position C6 and C9 to generate the formula isomer of macrolides. In addition, the effects of TPs on Caenorhabditis elegans were evaluated after Enho -Ere treatment. The intracellular ROS level, and the expression of antistress/lifespan-genes of C . elegans all showed significant difference after treatment, indicating that transformation and detoxification of macrolides was both accomplished by Enho -Ere.
研究领域:
生物化学
·
药理学
·
毒理学
·
分子生物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）