Nano Research
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2024
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IF 9.5
Li Rushuo,Ban Tao,Zhao Danfeng,Lin Jing,Liu Zhiyuan,Wang Linmeng,Huang Xiubing,Tao Zhiping,Wang Ge
Olefin hydrogenation under mild condition is crucial and challenging for industrial applications. Herein, defective UiO-66(Ce) was constructed by using cyanuric acid as the molecular etching “scissors” and further to synthesize heterogeneous catalyst with highly dispersed RuNi nanoparticles (Ru 1 Ni 1.5 @UiO-66(Ce)-12 h). The construction of Ce-O-Ru/Ni heterogeneous interfaces and Ni–Ru bonds provide electron transfer channels from Ce-oxo clusters and Ni species to Ru species. Furthermore, the microenvironment and electronic structure of Ru 0 active sites were synergistically regulated by adjusting the content of metal-organic frameworks (MOFs) defects and Ni promoter, thereby enhancing the adsorption and activation ability of H–H and C=C bonds. Therefore, Ru 1 Ni 1.5 @UiO-66(Ce)-12 h achieved dicyclopentadiene saturated hydrogenation (100% conversion) to tetrahydrodicyclopentadiene (∼ 100% selectivity) under mild condition (35 °C, 1 MPa) with only 25 min. Meanwhile, the sample exhibited excellent structural stability after 6 cycles test. This study provides a promising strategy for the rational design of remarkable noble metal-based catalysts for practical applications.
研究领域:
催化
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化学工程
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材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2020
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IF 4.632
Yanwei Cao,Huan Zheng,Gangli Zhu,Haihong Wu,Lin He
Selective hydrogenation of aromatic amines , especially chemicals such as aniline and bis(4-aminocyclohexyl)methane for non-yellowing polyurethane, is of particular interests due to the extensive applications. To conquer the existing difficulties in selective hydrogenation, the Ru 0 -Ru δ + /CeO 2 catalyst with solid frustrated Lewis pairs was developed for aromatic amines hydrogenation with excellent activity and selectivity under relative milder conditions. The morphology, electronic and chemical properties, especially the Ru 0 -Ru δ + clusters and reducible ceria were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), CO 2 temperature programmed desorption (CO 2 -TPD), H 2 temperature programmed reduction (H 2 -TPR), H 2 diffuse reflectance Fourier transform infrared spectroscopy (H 2 -DRIFT), Raman, etc . The 2% Ru/CeO 2 catalyst exhibited good conversion of 95% and selectivity greater than 99% toward cyclohexylamine. The volcano curve describing the activity and Ru state was found. Owning to the "acidic site isolation" by surrounding alkaline sites, condensation between the neighboring amine molecules could be effectively suppressed. The catalyst also showed good stability and applicability for other aromatic amines and heteroarenes containing different functional groups.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Xiang Li,Zhan Zhao,Kelei Huang,Xiangchao Meng,Zizhen Li
The design of highly efficient catalysts applied in a wide pH range for hydrogen evolution reaction (HER) is still very challengeable. Herein, a rapid Joule heating method has been applied to deposit Ru nanoparticles onto carbon nanotubes (Ru/CNTs). Owing to the rapid heating and cooling processes during the Joule heating treatment, the lattice was disordered with exposure of massive reactive sites for HER. As tested, Ru/CNTs showed outstanding activity in HER in a wide pH range. It only required an overpotential of 21 mV and 9 mV at 10 mA cm −2 for HER in 0.5 M H 2 SO 4 and 1 M KOH, specifically. The overpotential required to achieve a current density of 1 A cm −2 in 0.5 M H 2 SO 4 and 1 M KOH was 162 mV and 360 mV, respectively. The excellent performance of Ru/CNTs was comparable to commercial Pt/C catalyst. Furthermore, using the manufactured Ru/CNTs, a homemade anion-exchange membrane AEM electrolyzer was assembled. It only required 1.87 V to reach 100 mA cm −2 with nearly 100% Faraday efficiency. This work provided a novel method to prepare Ru nanoparticles onto carbon nanotubes by a rapid Joule heating treatment for advanced HER activity in a wide pH range.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
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2025
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IF 13.1
Kaijie Han,Song Song,Yong You,Xiaoqia Fu,Xingang Li
Ru-based catalysts are widely used for the reductive amination of carbonyl compounds. However, challenges remain, particularly in achieving high catalytic activity under mild conditions. In this study, we report a strategy to simultaneously modulate the electron density of Ru0 and the RuOx/Ru0 ratio by systematically adjusting the calcination temperature. The catalyst calcined at 200 °C demonstrated remarkable performance, achieving a 97.8% yield of furfurylamine at 30 °C, significantly outperforming most previously reported catalysts. Furthermore, it showed compatibility with a range of carbonyl compounds. At 200 °C calcination, the reduced electron density of Ru0 weakened its electron-donating ability, thereby facilitating H2 activation. Meanwhile, this treatment yielded the highest RuOx content and thereby generated the greatest Lewis acid site density, enhancing the adsorption and activation of NH3, furfural, and the Schiff base. Mechanistic studies reveal that the synergistic effect between electron-deficient Ru0 and Lewis acid sites significantly reduced the apparent activation energy for the ammonolysis of Schiff base intermediates, the rate-determining step in reductive amination. This work provides an effective strategy for tuning both the electronic structure of the metal and the acid properties of the catalyst, highlighting the crucial role of metal-acid synergy in promoting Schiff base ammonolysis during reductive amination.
研究领域:
催化化学
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化学反应工程
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材料科学
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有机化学
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物理化学
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产品关联
DOI
高影响因子
ACS Catalysis
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2020
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IF 12.35
Bangxin Li,Shuai He,Jibiao Li,Xiangling Yue,John T.S. Irvine,Deti Xie,Jiupai Ni,Chengsheng Ni
Employment of identical oxides for the cathode and anode in a symmetrical solid oxide fuel cell (SSOFC) is beneficial for decreasing the fabrication costs of a robust cell. Ce doping on the A site of SrFeO3 increased the structural stability in a reducing atmosphere, but ceria was found to exsolve from the perovskite during the cooling process in the air if the doping level reached 20 atom %. The additional doping of 5 atom % Ru in Sr0.8Ce0.2FeO3 on the Fe site could prevent the ceria segregation in air and induce the surface decomposition under fuel conditions for the formation of nanoscale SrO, CeO2, and Ru0. The SSOFC with Ce/Ru codoped SrFeO3 on a Sr- and Mg-doped LaGaO3 electrolyte showed a small Rp value (0.12 Ω cm2) when H2 and ambient air were used as fuel and oxidant, respectively. The peak power densities of 846 and 310 mW cm–2 were achieved at 800 °C using H2 and C3H8 as fuel, respectively. The excellent coke resistance of the anode could be related to the simultaneous in situ exsolution of CeO2, SrO, and Ru0 nanoparticles.
研究领域:
材料科学
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电化学
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能源材料
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燃料电池
✓ 已验证
产品关联
DOI
高影响因子
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