CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3437-3446
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IF 2.936
Yue Yihang,Li Yong,Wang Tingting,Wang Shifeng,Han Lin,Du Chun
A Pd/CeO 2 -M with high methanol oxidation performance was prepared from metal–organic framework (MOF). The reaction results indicate that the Pd/CeO 2 -M could achieve 100% methanol oxidation at 200 °C over the traditional Pd/CeO 2 -C at 350 °C. The high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Raman show that the Pd was uniformly distributed over the CeO 2 that was rich in oxygen vacancies. The methanol temperature program surface reaction (MeOH-TPSR) demonstrates that the Pd/CeO 2 -M could effectively decompose methanol at a lower temperature with the assistance of oxygen vacancies compared with Pd/CeO 2 -C. Methanol oxidation was conducted with in-situ Raman, CO diffuse reflectance infrared Fourier transformed spectroscopy (CO-DRIFTS) and in-situ DRIFTS to elucidate the reaction mechanism and establish the structure–activity relationship. The oxygen vacancies have participated in the assistance of methanol oxidation, which was revealed via in-situ Raman. The CO-DRIFTS indicates that the chemisorbed CO was more in linear form, which demonstrates that the Pd particles were over CeO 2 -M with a smaller size. The in-situ DRIFTS experiments show the methanol could be further effectively oxidized to bidentate formate over Pd/CeO 2 -M with the assistance of oxygen vacancies. The Pd/CeO 2 -M catalysis and its enhancement mechanism studies provided a potential strategy in the VOC removal catalysis development. Graphical Abstract
研究领域:
催化化学
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Jinxu Zhang,Fusheng Yang,Tao Fang,Bin Wang,Qingyuan Yang,Zhen Wu,Zaoxiao Zhang
The N-ethylcarbazole/dodecahydro-N-ethylcarbazole system, which offers advantages such as excellent hydrogen storage capacity, good reversibility, and reliable safety, is recognized as a potential candidate for hydrogen storage. However, the inefficient dehydrogenation by existing catalysts limits the commercial application of the system. In this work, CTAB was used as the soft template to increase the specific surface area of CeO 2 supports, and further the active metals were formed upon them through various reduction methods. A series of Pd/CeO 2 catalysts were thus prepared, among which Pd/CeO 2 –C6 adopted a composite strategy of using CTAB as the template to increase the specific surface area of CeO 2 and enhancing the dispersion of Pd through ultrasound assisted reduction, showed the best catalytic dehydrogenation performance for 12H-NEC. After 7 h of reaction at 453 K, the conversion rate of 12H-NEC reached 100 % with 97.24 % of hydrogen released. Combining BET, HRTEM, XPS, CO-pulse chemisorption and other characterization analyses, it was found that the incorporation of CTAB effectively enhanced both the specific surface area and oxygen vacancy concentration of CeO 2 , while ultrasound assisted reduction enabled a small particle size and good dispersion of metal Pd on the support. The strong synergetic effects of support and active metal in Pd/CeO 2 –C6 catalyst largely accounts for its good catalytic performance. This work offers valuable insights and guidance for the development of efficient dehydrogenation catalysts for 12H-NEC.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 20
·6732-6741
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IF 6.119
Yafeng Chen,Guimin Jiang,Xiangzhi Cui,Zuotai Zhang,Xinmei Hou
Eliminating indoor formaldehyde (HCHO) pollution at room temperature is highly needed to improve the environment while saving energy. Herein, Pd/CeO2 catalysts with different morphologies of the CeO2 support were employed to investigate their performance for HCHO oxidation. The Pd/CeO2 nanocube (Pd/CeO2-C) catalyst exhibited excellent catalytic activity compared to commercial CeO2 and CeO2 nanorods. HCHO can be completely converted into CO2 and H2O over the Pd/CeO2-C (0.64 wt% Pd) catalyst at a weight hourly space velocity of 36 000 mL g−1 h−1 at room temperature. Multiple characterization results confirmed that the strong interfacial interaction between Pd and the CeO2-C support guarantees a high percentage of metallic Pd on the CeO2-C surface and its high dispersion, which is crucial for the oxidation of formaldehyde at low temperature. The in situ diffuse reflectance infrared Fourier transform results indicated that CO, formate and dioxymethylene species are the main intermediates over the Pd/CeO2-C catalyst, and the active O species is responsible for their decomposition and oxidation. This work may promote the practical application of high performance Pd-based catalysts for indoor HCHO purification and related catalytic processes.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Journal of Materials Chemistry A
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2024
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IF 10.7
Di-Ye Wei,Ge Zhang,Hong-Jia Wang,Qing-Na Zheng,Jing-Hua Tian,Hua Zhang,Jian-Feng Li
Revealing and understanding water activation and reaction at metal-oxide interfaces is of significant importance. However, it remains a great challenge due to the weak signal of surface-active species and the difficulty of in-situ detection methods. Herein, the water-gas shift reaction mechanism at the Pd-CeO2 interfaces has been systematically studied by using the “borrowing” surface-enhanced Raman spectroscopy (SERS) strategy through the fabrication of Au@CeO2-Pd core-shell satellite structures. Through the combination of in-situ SERS and online mass spectrometry, real-time monitoring of surface intermediate species and reaction products is achieved simultaneously. It is found that CO adsorbed on Pd can either react with the oxygen species formed via water dissociation (the associative mechanism) or the lattice oxygen in CeO2 (the redox mechanism), while the former has a higher activity. This work provides an effective way for the in-situ study of interfacial catalysis and explains the important role of the Pd-CeO2 interfaces in the water-gas shift reaction at a molecular level.
研究领域:
催化化学
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材料科学
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表面科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Zonggao Hu,Guoli Zhou,Li Xu,Jinghe Yang,Bing Zhang,Xu Xiang
The heterogeneous catalysts based on ternary Pd/CeO 2 -nitrogen-doped graphene (NG) were prepared and utilized for solvent-free aerobic oxidation of benzyl alcohol to benzaldehyde in the presence of green oxidant O 2 . Characterization results revealed that CeO 2 dramatically enhanced the dispersion of Pd nanoparticles, reduced their particle size and inhibited the Pd oxidation formation. With high lattice oxygen storage capability of CeO 2 , excellent electrical conductivity of NG and high catalytic activity of Pd, the ternary catalyst was designed by combining the complementary superiorities of these three components. The ternary composite Pd/5CeO 2 -NG exhibited significantly higher catalytic activity with turnover frequency (TOF) of 30.74 s −1 for solvent-free aerobic oxidation of benzyl alcohol compared with the corresponding binary composites including 5CeO 2 -NG, Pd/NG and Pd/CeO 2 , verifying the synergistic effect among Pd, CeO 2 and NG. The ternary composite was stable and could be recycled up to 6 times without remarkable loss in the activity and selectivity towards benzaldehyde. Owing to its excellent activity, high selectivity, and exceptional stability and recyclability, the Pd/CeO 2 -NG composite has great application potential in the fields of organic synthesis, electrochemical biosensors and fuel cells.
研究领域:
材料科学
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有机化学
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催化反应
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DOI
高影响因子
Chemosensors
·
2025
·Vol. 13
·期 9
·330
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IF 3.7
Zihui Li,Wenxue Chen,Qiongya Wan,Haoliang Li,Xuefeng Wang,Pengcheng Xu,Yuan Zhang,Yongheng Zhu,Xinxin Li
This study presents a highly sensitive non-enzymatic electrochemical sensor for detecting Sunset Yellow, a common food additive in beverages, based on palladium-cerium oxide composite decorated carbon black (CB). The sensing material was prepared by depositing palladium nanoparticles onto cerium oxide nanocubes, followed by the uniform dispersion of CB through sonication in a water bath. The strong metal–support interaction between palladium and cerium oxide significantly enhances catalytic activity, while the CB ensures excellent conductivity and structural support for the catalyst. Under optimized conditions, the sensor exhibits a linear response to Sunset Yellow concentrations in the range from 1 to 100 nM, with a limit of detection (LOD) of 0.056 nM. Additionally, the sensor demonstrates remarkable selectivity and stability. Practical application in real orange juice samples yielded recoveries from 99.11% and 101.34%, confirming its reliability for real-world beverage analysis.
研究领域:
电化学传感
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食品安全
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纳米材料
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分析化学
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环境监测
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DOI
高影响因子
危险品化学品经营许可证（带存储）