INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Mingshuai Sun,Fumin Wang,Guojun Lv,Xubin Zhang
Overhydrogenation to ethane is most undesired in selective hydrogenation of acetylene. Monometallic Pd supported on common oxide supports such as alumina and silica suffers from susceptibility of ethane formation, and the ethylene selectivity is usually unsatisfactory. Herein, Fe5C2 was carefully synthesized and employed as a new kind support doped with a (5–600) ppm level of Pd for selective hydrogenation of acetylene. The catalyst with appropriate Pd loadings exhibited more efficient ethane suppression and much higher ethylene selectivity than the traditional α-Al2O3 supported Pd catalyst, with full acetylene conversion under 240 °C, and maintained good stability after a 200 h tolerance test. Characterization and DFT calculation results reveal that the excellent ethylene selectivity is mainly derived from the special interaction between Pd atoms and the Fe5C2 support. Hydrogenation of ethylene to ethane needs to cross extremely high activation energy barriers on the catalyst surface, and ethylene desorption more easily occurs on it. Doping the appropriate amount of Pd atoms on the Fe5C2 surface can increase the obstacle for polymerization and will cause the unsaturated C2 species to be more inclined to be hydrogenated into C2H4. This synergy effect also acts as a guide in alkane suppression for selective hydrogenation of other alkynes.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Li Lv,Yinglin Wang,Pengfei Cheng,Bao Zhang,Fan Dang,Luping Xu
The preparation process and gas sensitivity test of three-dimensional sphere spinel ferrites with well-assembled macroporous structures have been reported in this paper. The three-dimensional ZnFe 2 O 4 macroporous spheres (3D ZnFe 2 O 4 MPs) were prepared by one-step ultrasonic spray pyrolysis (USP), in which self-assembly sulfonated polystyrene (S-PS) spheres were employed as sacrificial template. The as-prepared samples possessed interconnected macroporous with pore diameters about 200 nm can be observed in TEM characterization, which provided more reactive active sites. The catalyst Pd was doped in 3D ZnFe 2 O 4 MPs with the attempt of enhancing gas-sensing performance, which has been confirmed existed as Pd 2+ formation by XRD and XPS analysis. In a comparison with pure 3D ZnFe 2 O 4 MPs, the 0.5% PdO-dopded 3D ZnFe 2 O 4 MPs exhibited a 2 times higher response (18.9) to 100 ppm acetone at 275 °C. Furthermore, the PdO- dopded 3D ZnFe 2 O 4 MPs-based sensor also presented excellent selectivity and good long-term stability towards acetone. The outstanding sensing performance can be attributed to the 3D spheres with interconnect macroporous structure, electronic sensitization and catalytic effects of PdO. The relative sensing mechanism has been discussed in detail.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jie Wan,Chengao Liu,Xiaoxia Wang,Huajing Wang,Lu Tang,Zhenming Du,Wulin Song,Dawen Zeng
Safety problem caused by the leakage of electrolyte in lithium-ion batteries (LIB) have become a critical hot issue. However, since the main components of LIB electrolyte, such as dimethyl carbonate (DMC), are volatile or redox, trace electrolyte leakage is difficult to detect. Therefore, in order to realize early detection of electrolyte leakage and real-time monitoring of LIB health, here we report a success of DMC gas detection by MOS sensor based on Co/Pd-doped SnO 2 nanomaterial for LIB health monitoring. In detail, the sensor showed high response to DMC when compared to interfering gases. Especially, the sensor could detect DMC down to the ppb level (the response value of the 500 ppb DMC is about 1.6). The response and recovery time for 1 ppm DMC were about 66 s and 240 s, respectively. The response of the sensor was obvious even when the leakage levels were as low as only 0.1 μL electrolyte. Furthermore, in the simulated electrolyte leakage via LIB penetration experiment, the sensor successfully exhibited an instant response, which proved that this work effectively provides a new approach for LIB real-time health and safety monitoring.
研究领域:
材料科学
·
传感器技术
·
电池安全
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Bing Yang,Bo Wang,Futian Zhang,Jing Chen,Xuzhuo Sun,Bo Li,Mengxi Tan,Lushan Ma,Yunfeng Tian,Bo Chi
Reversible symmetric solid oxide cells (RSSOCs) offer a promising solution for bidirectional electric-hydrogen conversion, enabling integrated energy storage and conversion within a single device. However, their symmetric electrode design, which requires multifunctional catalytic activity, continues to face challenges in terms of both activity and stability. Here, we overcome these challenges by employing an innovative A-site defect and B-site Pd doping strategy in Pr 0.2 Sr 0.8 Co 0.2 Fe 0.8 O 3-δ (PSCF), which results in the in-situ exsolution of B-site metal elements. This approach results in the formation of Pd and Co-Fe nanoparticles, which significantly enhance the electrocatalytic performance of the symmetric electrodes. Electrochemical test shows that defect-engineered PSCFPd with 10 % A-site deficiency achieves a peak power density of 0.830 W cm −2 in fuel cell mode at 850 °C and a current density of 1.64 A cm −2 at 1.5 V in electrolysis mode (50 % H₂O). In addition, the cell demonstrates excellent stability, maintaining performance over 210 h in fuel cell mode and 168 h in electrolysis mode at 800 °C. First-principles calculations further confirm that the defect structure enhances B-site metal migration to the surface, promoting oxygen vacancy formation and mitigating Sr segregation, thereby improving both performance and durability. This work provides a new avenue for the design of high performance electrodes in RSSOCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 47
·475506
·
IF 3.874
Jiawen Shi,Sen Liu,Peng Zhang,Ning Sui,Shuang Cao,Tingting Zhou,Tong Zhang
Methane (CH4) gas sensors play an important role in industrial safety and detection of indoor gas quality. In general, metal oxide semiconductor sensing materials with nano-structure have high responses to the target gas. However, the sensor resistance is usually very high. Considering the practical application, it is vital to reduce base resistance and improve sensitivity for gas sensors. Herein, Pd-doped SnO2 nanoparticles were prepared as the basis material by a simple sol-gel method. In order to adjust the resistance, the pentavalent metal element (Sb) was introduced via a simple doping route. As CH4 sensing layers, the prepared SnO2-sensors doped with Pd and Sb exhibited the most obvious resistance reduction effect. Meantime, excellent sensing performances including high response, fast response/recovery time, excellent reproducibility and great stability were also obtained. In-depth research has shown that the ability to reduce resistance depends on the effective internal doping of cation with high valence. The enhanced sensing capability can be attributed to the 'synergistic effects' including catalytic effects of novel metals, increased oxygen vacancies and decreased band gap energy. This work can provide a new opportunity to design metal oxide sensing materials with low resistance and high sensitivity.
研究领域:
材料科学
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传感器技术
·
纳米科技
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Haoyang Fu,Ruizhao Wang,Qianyu Xu,Minwang Laipan,Chenliu Tang,Weixian Zhang,Lan Ling
Typical antineoplastic agent doxorubicin (DOX) contamination is a major environmental concern and its efficient purification remains a daunting challenge so far. This work explored the potential of Fe/Pd-doped graphite carbon nitride (g-C 3 N 4 @Fe/Pd) for DOX removal from water, involving the removal performance, mechanism, and pathway. Structural characterization of g-C 3 N 4 @Fe/Pd showed that the metallic Pd clusters are decorated on the surface of uniformly distributed iron nanoparticles (~ 28 nm) on g-C 3 N 4 . The existence of g-C 3 N 4 effectively relieved the agglomeration and overgrowth of iron nanoparticles, the strong coupling effect among the Fe, Pd and N demonstrates the excellent DOX removal performance (k = 0.115 min −1 ) with versatility under different initial concentrations (30–150 mg/L) and material dosages (0.1–0.4 g/L). Three possible degradation pathways of DOX were proposed, where catalytic saccharide moiety elimination is the primary pathway. Importantly, intermediates exhibit lower toxicity and the final degradation product is efficiently adsorbed by g-C 3 N 4 @Fe/Pd.
研究领域:
环境科学
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材料科学
·
药学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）