Materials Today Sustainability
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2023
·
IF 7.8
G. Yang,H. Sun,R. Liu,J. Shi,X. Tong
Heterogeneous catalytic and selective C–C bond cleavage is considered as the important way for the production of high valuable compounds from large-molecule-weight feedstock . In this article, a sustainable and efficient aerobic oxidative C–C bond cleavage of lignin models is developed with the bismuth-based solid catalyst. Therein, the flower-like Bi 2 O 2 CO 3 exhibits a high photocatalytic efficiency in the reaction medium combined of n-butanol and tetramethylammonium bromide. For example, the selective oxidative C–C bond cleavage of 1-phenyl-ethane-1, 2-diol has been successfully carried out, where the substrate conversion and the selectivity of benzaldehyde was 95% and 99%, respectively. The study exhibited that the amount of oxygen vacancies plays a significant role on the photocatalytic selective aerobic oxidative cleavage processes. Moreover, the selective aerobic oxidative C–C bond cleavage of different lignin models was investigated, and all the yields of corresponding products are more than 90% with this photocatalytic system. Furthermore, the used flower-like Bi 2 O 2 CO 3 can be recycled at least 5 times without the obvious decrease of catalytic activity .
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Aolin Xie,Bei Zhang,Yicheng Ge,Ke Peng,Ping Xu,Xiaodong Wang,Zhirong Feng,Maozhong Yi,Zhe Zhou
To maintain the thermal stability of SiC nanowires during SiC coating fabrication process, carbon and SiC double protective layers were covered on the surface of nanowires. And SiC nanowires with double protective layers toughened SiC coating were prepared by pack cementation. The results showed that after introducing the SiC nanowires with double protective layers, the fracture toughness of the SiC coating was increased by 88.4 %. The coating protected C/C for 175 h with a mass loss of 3.67 %, and after 51 thermal shock cycles, the mass losses of the oxidized coating were 3.96 %. The double protective layers are beneficial to improve the thermal stability of nanowires, leading to good fracture toughness and thermal shock resistance of SiC coating. SiC nanowires consume the energy of crack propagation by fracture, pullout and bridging, leading to an increase in fracture toughness.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
Research
·
2022
·
IF 11.036
Hai-Fang Li,Jing Zhao,Wenbo Cao,Wenpeng Zhang,Yu Xia,Zheng Ouyang
Unraveling the complexity of the lipidome requires the development of novel approaches to facilitate structural identification and characterization of lipid species with isomer-level discrimination. Ultraviolet photodissociation tandem mass spectrometry (UVPD MS/MS) is a promising tool for structure determination of lipids. The sensitivity of UVPD for lipid analysis however is limited mainly due to weak absorption of UV photons by a C=C. Herein, a C=C site-specific derivatization, the Paternò-Büchi (PB) reaction, was used to incorporate a chromophore to the C=C moiety in fatty acyls, leading to significantly improved UVPD efficiency and sensitivity for pinpointing C=C locations. The wavelength-dependent photodissociation of the PB products demonstrated 4-CF3-benzophenone as the best reagent for UVPD in terms of the efficiency of generating C=C diagnostic fragments and simplicity for C=C location assignments. We demonstrated the effectiveness of this approach for the shotgun profiling of C=C location isomers in different lipid classes from complex lipid extracts, highlighting its potential to advancing the identification of the C=C bond locations in unsaturated lipids.
研究领域:
生物化学
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分析化学
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质谱技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Yanyan Wang,Jiaping Liao,Zunyuan Xie,Kan Zhang,Ya Wu,Ping Zuo,Weiqiang Zhang,Jiyang Li,Ziwei Gao
Supported palladium catalysts have attracted significant attention for use in cross-coupling reactions due to their recyclability. However, the inevitable progressive loss of Pd that occurs in the catalytic process deactivates the catalysts, which hinders their sustainable application. Herein, we report a zeolite-enhanced sustainable Pd catalyst for C–C cross-coupling reactions. Zeolite does a good job of acting as a sink for Pd2+ ions. This catalyst exhibits an excellent homogeneous catalytic performance by releasing Pd species from zeolite. In addition, the Pd2+ ions were successfully recaptured in a controlled catalytic system by combining the uniform microporous structure and good adsorption features of zeolite. The release/capture mechanism of the Pd species guaranteed the high loading and high dispersion of Pd on the recycled catalyst. The 0.84%Pd@USY catalysts were reused at least 10 times in water without an appreciable reduction in activity. This study presents a new perspective toward the design of a highly efficient and sustainable supported metal catalyst.
研究领域:
化学工程
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催化科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2016
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IF 2.628
Zhifeng Dai,Fang Chen,Qi Sun,Yanyan Ji,Liang Wang,Xiangju Meng,Feng-Shou Xiao
An efficient catalyst system based on a Pd-metalated porous organic polymer bearing phenanthroline ligands was designed and synthesized. This catalyst was applied to various C–C bond-forming reactions, including the Suzuki, Heck and Sonogashira couplings, and afforded the corresponding products while exhibiting excellent activities and selectivities. More importantly, this catalyst can be readily recycled. These features show that such catalysts have significant potential applications in the future.
研究领域:
化学
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材料科学
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DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 3
·199
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IF 4
Aiming Huang,Jiayue Yu,Junjun Zhang,Yifan Zhang,Yang Wu,Yong Wang,Wen Luo
The electroreduction of CO2(CO2RR) is a promising and environmentally sustainable approach to closing the carbon cycle. However, achieving high activity and selectivity for multicarbon (C2₊) products remains a significant challenge due to the complexity of reaction pathways. In this study, porous carbon-supported copper catalysts (CuHCS) with pore sizes of 120 nm (CuHCS120) and 500 nm (CuHCS500) were synthesized to tailor the microenvironment at the electrode–electrolyte interface and enhance product selectivity. CuHCS120 achieved a maximum faradaic efficiency (FE) for C2₊ products of 46%, double that of CuHCS500 (23%). In contrast, CuHCS500 showed a higher FE for CO (36%) compared to CuHCS120 (14%) at the same potential. In-depth ex situ and in situ investigations revealed that smaller pores promote the enrichment and adsorption of *CO intermediates, thereby enhancing C–C coupling and the formation of C2₊ products. These findings underscore the critical role of structural confinement in modulating the catalytic microenvironment and provide valuable insights for the rational design of advanced catalysts for CO2RR.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Xiaoping Zhang,Xiang Ren,Konstantin Chingin,Jiaquan Xu,Xin Yan,Huanwen Chen
We present an approach for the elucidation of C=C bond position and cis/trans isomers, which is achieved by the reaction of ambient water radical cations and double bonds, followed by the fragmentation of epoxide radical cations to generate diagnostic ions in tandem mass spectrometry . Hexenol double bond positional isomers and cis/trans isomers which exhibit different properties and biological functions are characterized as a proof of concept. The merits of the approach include the simplicity of experimental setup, rapid derivatization (within seconds), the obviation of organic solvents , as well as easy spectral interpretation.
研究领域:
分析化学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2019
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IF 4.745
Na Li,Jinku Bai,Xiaolin Zheng,Honghua Rao
An iron-catalyzed methylene forming strategy is disclosed through sequential C–H and C–O bond functionalization of methanol with cosolvent water. This protocol provides an easy and novel access to methylene-tethered imidazo[1,2-a]pyridine and 2-aminopyridine analogues in a sustainable manner and represents a complementary approach to traditional methylene forming strategies.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Zhuoyu Han,Yitong Lu,Yuliang Li
Lignin has limited potential for transformation into high-value-added chemicals due to the non-polar nature and high bond dissociation energy of its intramolecular C-C bonds. Herein, we synthesized an N-doped Nb 2 O 5 photocatalyst with rod-shaped structure through hydrothermal method followed by calcination for C-C bonds cleavage of β-O-4 type lignin model compound under simulated sunlight. The comprehensive characterization results demonstrated that N doping and the resultant oxygen vacancies significantly enhance visible light response intensity of Nb 2 O 5 , while also altering the valence band and conduction band position. The enhanced reducibility at high conduction band position facilitated the rapid reduction of O 2 to generate superoxide radicals, accelerating the separation of carriers. The N-doped Nb 2 O 5 catalyst achieved 90% lignin conversion, surpassing pristine Nb 2 O 5 (59%), with stable performance over 5 consecutive cycles. This work provides a reference for developing efficient C-C bond selective cleavage photocatalysts through doping strategies.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Huimin Li,Zhe Sun,Chenlong Dong,Xueli Zhang,Chengkun Lei,Baobao Jin,Qianqian Shen,Husheng Jia,Jinbo Xue
Photocatalytic non-oxidative coupling of methane is an attractive strategy for CH 4 to C 2 conversion, how to facilitate the photogenerated charge separation and accelerate the C–C coupling to promote the reaction kinetics remains a great challenge. Herein, a symbiotic r-Fe 2 O 3 /NiO heterostructure with robust interfaces is constructed in situ. The coherent interface not only provides unique Ni–O–Fe asymmetric sites, but also achieves the separation and transport of photogenerated charge. The unbalanced charge density distribution of two adjacent methyl or methylene at the Ni–O–Fe asymmetric site alleviates the dipole repulsion of the C–C coupling, and promotes C–C coupling to form C 2 hydrocarbons. Under visible light irradiation, the optimal r-Fe 2 O 3 /NiO performs a brilliant C 2 activity up to 71.00 μmol g −1 h −1 , and the C 2 H 4 yield can reach a high value of 40.46 μmol g −1 h −1 and the selectivity of 56.98 %. This work provides new insights into the coupling of C–C to generate C 2 hydrocarbons.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
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IF 6.6
Yuanming Zhou,Mingyang Li,Shuxin Li,Shuangxing Zhu,Ruizhi Liu,Maozhong Yi,Ke Peng
The oxide layer that forms on the surface of C/C composites matrix-modified with multiphase ultra-high temperature ceramics is generally loose and poorly bonded, limiting its effectiveness in enhancing the ablation resistance of C/C composites. In this study, C/C composites were matrix-modified using solid solution ceramic TaZr 2 C 3 -SiC and multiphase ceramic TaC-2ZrC-SiC, both with the same Zr/Ta ratio. The C/C-TaZr 2 C 3 -SiC and comparative sample C/C-TaC-2ZrC-SiC composites were prepared through a high-solid-loading slurry impregnation method combined with a precursor infiltration and pyrolysis process. The flexural properties were evaluated, and ablation tests were conducted under an oxyacetylene flame. Compared to C/C-TaC-2ZrC-SiC, the C/C-TaZr 2 C 3 -SiC sample exhibited superior flexural properties and ablation resistance. The flexural strength, elastic modulus, and fracture toughness improved by 10.80%, 29.75%, and 37.67%, respectively. The mass and linear ablation rates were reduced by up to 85.49% and 77.26%, respectively. The superior ablation resistance of C/C-TaZr 2 C 3 -SiC was attributed to the formation of the anti-ablation microstructure composed of the Ta-rich oxide binder phase and Zr-rich oxide skeleton phase in the Ta-Zr-O oxide layer. The microstructure enhanced the viscosity of the oxides and strengthened their interfacial bonding, effectively suppressing the splashing and consumption of surface oxides under high heat flux while preventing their accumulation in the brim ablation region. The oxide layer was more compact and tightly bonded to the composite surface, providing the composites with significantly improved ablation protection. These findings provide a novel and effective approach for further improving the ablation resistance of C/C composites.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17644-17651
·
IF 3.201
Shaobo Li,Tao Zhu,Lichun Dong,Mingdong Dong
Heteroatom doping has been demonstrated to be an effective way to tune the properties of nanomaterials including chemical reactivity and electronic and optical performance. In this study, rGO/g-C3N4 and boron doped rGO/g-C3N4 (B-rGO/g-C3N4) nanocomposites were fabricated via a rapid plasma treatment method, and their photocatalytic performance under visible light radiation was examined. The results showed that the photocatalytic efficiency of B-rGO/g-C3N4 for rhodamine B degradation can be 50% higher than that of rGO/g-C3N4 at an optimum rGO loading of 5 wt%. XPS and FTIR analyses indicated the enhanced C–O–C covalent bonding between rGO and g-C3N4 in B-rGO/g-C3N4, and the optical characterization demonstrated that it could further improve the separation of the photo-generated chargers and narrow the bandgap of the nanocomposite. This work provides an idea that boron doping could be an effective way to promote the chemical interaction between different components in composite materials, which is important in designing and developing new functional nanomaterials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
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