Catalysts
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2020
·Vol. 10
·期 11
·1304
·
IF 3.52
Qiang Yuan,Jifeng Pang,Wenguang Yu,Mingyuan Zheng
A high-performance Pt catalyst supported on SBA-15 was developed for furfural decarbonylation. Compared to Pt catalysts loaded on microporous DeAl-Hbeta zeolite and hierarchical micro-mesoporous MFI nanosheet (NS) materials, the 1%Pt/SBA-15 catalyst afforded notably higher activity, furan selectivity and stability owing to the negligible acid sites and proper mesopores on the SBA-15 support. Among a set of 1%Pt/SBA-15 catalysts bearing Pt nanoparticles (NPs) with sizes of 2.4–4.3 nm, the catalyst with 3.7 nm Pt NPs afforded the highest furan selectivity. Over the optimal catalyst, 88.6% furan selectivity and ca. 90% furfural conversion were obtained at 573 K and a high weight hourly space velocity (WHSV) of 16.5 h−1. Moreover, the reaction temperatures at 440–573 K and the ratios of H2to furfural at 0.79–9.44 did not affect the reaction selectivity notably, showing that the reaction over 1%Pt/SBA-15 can be conducted over a wide range of conditions. The catalyst was stable under the harsh reaction conditions and lasted for 90 h without significant deactivation, demonstrating the superior property of SBA-15 as a catalyst support for furfural decarbonylation.Keywords:decarbonylation;furfural;furan;platinum;SBA-15
研究领域:
催化化学
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能源化学
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材料科学
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产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 19
·7973-7977
·
IF 1.938
Yingfeng Qin,Liangliang Zhang,Gaojie Ye,Shulin Zhao
A homogeneous label-free colorimetric sensing strategy for bleomycin (BLM) assay was developed on the basis of BLM enhanced Fe(II)–H2O2–ABTS reaction. Fe(II) exhibits a catalytic effect on H2O2-mediated oxidation of ABTS by Fenton chemistry. BLM·Fe(II) complex possessed a significantly higher catalytic ability than Fe(II) probably because of the further formation of more active “activated oxo-iron-bleomycin complex”. The present method was convenient without any complicated chemical synthesis, modification, or tedious experimental procedures. Analysis results can be seen with the naked eye and monitored by UV-vis spectra. The peak absorbance exhibits a linear relationship with BLM concentrations from 25 nM to 1 μM, and a detection limit of 16 nM can be achieved. The designed colorimetric strategy may provide a promising alternative for BLM detection in clinical samples.
研究领域:
分析化学
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生物医学
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临床检验
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 34
·4964-4971
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IF 3.474
Qi Zhao,Qin Wang,Yiguo Su,Keke Huang,Guangran Xu,Yingjun Li,Jiayin Liu,Baocang Liu,Jun Zhang
Driven by the need of high catalytic performance and low cost Pt-based catalysts for methanol oxidation (MOR) and oxygen reduction (ORR) reactions, we developed a highly active nitrogen species-decorated Pt–Ni–N catalyst with tunable architectures and facets toward high catalytic activity. The synthetic procedure was conducted by Ni2+-assisted morphology and facet transformation from nanoflowers (NFs) (111) to nanoparticles (NPs) (220) and simultaneous optimization of both hierarchical structure and active surface sites. It is found that the adsorption of nitrogen species plays critical roles in determining both facet control of the Pt–Ni–N hierarchical structure and energetic activation of the catalytic reaction. Decoration of surface nitrogen species can effectually improve the relative content and electronic density of Pt0, leading to formation of a hierarchical structure and significantly improved catalytic activity toward both MOR and ORR compared with Pt–Ni and Pt–N, as well as the commercial Pt/C catalysts, indicating a new strategy to obtain highly efficient catalysts. Moreover, the results demonstrate that the catalytic enhancement is mainly due to the synergistic electronic effects among Pt, Ni, and N species.
研究领域:
材料科学
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电催化
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纳米技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Jie-Ning Zheng,Li-Li He,Fang-Yi Chen,Ai-Jun Wang,Meng-Wei Xue,Jiu-Ju Feng
In this work, bimetallic alloyed platinum-palladium (PtPd) nanoflowers are fabricated by one-pot solvothermal co-reduction of Pt (II) acetylacetonate and Pd (II) acetylacetonate in oleylamine system. The as-prepared nanostructures show the enhanced electrocatalytic activity for oxygen reduction reaction (ORR), dominated by a four-electron pathway based on the Koutecky-Levich plots, mainly owing to the inhibition of the formation of Pt–OH ad via the downshift of d-band center for Pt. Meanwhile, PtPd nanoflowers display good methanol tolerance and improved stability for ORR. The chronoamperometry test reveals that the current of PtPd nanoflowers remains 45.9% of its original value within 6000 s, much higher than those of commercial Pt (36.7%) and Pd (32.2%) black catalysts. Therefore, PtPd nanoflowers with unique interconnected structures can be used as a promising cathode catalyst in direct methanol fuel cells.
研究领域:
材料科学
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化学工程
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能源科学
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产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 13
·5699-5705
·
IF 7.394
Jing-Jing Lv,Li-Ping Mei,Xuexiang Weng,Ai-Jun Wang,Li-Li Chen,Xiang-Feng Liu,Jiu-Ju Feng
A facile one-pot solvothermal method was developed for the fabrication of well-defined three-dimensional highly branched Pt–Pd alloyed multipods, using ethylene glycol as a solvent and a reducing agent, along with N-methylimidazole as a structure-directing agent, without any seed, template, or surfactant. The as-prepared nanocrystals exhibited a relatively large electrochemically active surface area, improved electrocatalytic activity and superior stability for ethylene glycol oxidation in alkaline media, compared with commercial Pt black and Pd black, making them promising electrocatalysts in fuel cells.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2015
·Vol. 5
·期 106
·87061-87068
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IF 3.84
Pei Song,Shan-Shan Li,Li-Li He,Jiu-Ju Feng,Liang Wu,Shu-Xian Zhong,Ai-Jun Wang
In this work, bimetallic Au–Pt alloyed nanowire networks (AuPt NNs) were facilely synthesized by a simple and rapid one-pot wet-chemical method on a large-scale, using N-methylimidazole as a structure-directing agent and a weak stabilizing agent. The surface of AuPt NNs was clean owing to the easy removal of the adsorbed N-methylimidazole. The control experiments demonstrated that the morphologies of AuPt NNs were strongly correlated with the amount of N-methylimidazole and reaction temperature. The formation mechanism included the four-stage growth processes: rapid nucleation, selective adsorption, π–π induced assembly, and oriented attachment growth. The as-synthesized AuPt NNs exhibited enhanced electrocatalytic activity and improved stability for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) as compared to commercial Pt black and individual Pt nanoparticles.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Omega
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2023
·
IF 4.1
Bolin Wang,Yuxue Yue,Yuliang Li,Lu Yu,Hong Tang,Haifeng Zhang,Feng Feng
Imidazolium-based ionic liquid mixtures with [NO3]− and [AlCl4]− anions were used as oxidizing agents for the dissolution of Au, Pd, and Pt metals under mild conditions. The thermodynamic reduction of [NO3]− to [NO] is catalyzed by [AlCl4]− anions and coupled with the oxidation process of noble metals. The developed ionic liquid system for dissolving Au can reactivate the Au0 formed in the deactivation process of the catalyst in vinyl chloride production. This demonstrates the relevance of the here-presented work for technical noble metal recycling.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Nano
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2022
·
IF 18.027
Jie Yu,Xidong He,Qingfei Zhang,Dongfang Zhou,Zigui Wang,Yubin Huang
Theranostics of platinum (Pt)-based chemotherapy are able to self-track the biodistribution and pharmacokinetics while performing therapeutic effects. Pt-based CT imaging is expected to visualize and monitor the tumor throughout the entire tumor inhibition stage. However, a sufficient Pt concentration is necessary for CT imaging, which may bring about severe nephrotoxicity. A Bio-Pt-I compound is designed and synthesized by conjugation of iodine and biotin to the structure of Pt and further self-assembles into nanoparticles. The introduction of iodine not only enhances the CT imaging signal with a much lower dose of Pt but also overcomes the resistance of tumor cells to Pt-containing nanomedicine by inhibiting the expression of Bcl-2. Furthermore, biotin-mediated tumor targeting increases drug accumulation in tumors. This work combines CT imaging based self-track with efficient cisplatin-resistance reversion ability, which may promote the clinical transformation of Pt-containing nanomedicine.
研究领域:
药学
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纳米技术
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癌症治疗
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医学成像
✓ 已验证
DOI
PubMed
高影响因子
MedComm
·
2024
·Vol. 5
·期 12
·e70033
·
IF 10.7
Jing Li,Mimi Chen,Dingwen Huang,Ziyin Li,Yu Chen,Jinhua Huang,Yuanqun Chen,Zhili Zhou,Zhiying Yu
Ovarian cancer (OV) ranks among the deadliest gynecological cancer, known for its high risk of relapse and metastasis, and a general resistance to conventional platinum‐based chemotherapy. Selenoprotein I (SELENOI) is a crucial mediator implicated in human hereditary spastic paraplegia. However, its role in human tumors remains poorly elucidated. Here, we comprehensively analyzed SELENOI expression patterns, functions, and clinical implications across various malignancies through the integration of bulk transcriptomics, cancer databases, and in vitro and in vivo experiments. Pan‐cancer analysis indicated upregulated SELENOI expression across various cancers, correlating with augmented malignancy, suppressed tumor immunity and poor prognosis. Knockdown of SELENOI caused G0/G1‐phase cell cycle arrest and diminished aggressive cancer phenotypes in OV cells. Moreover, SELENOI inhibition augments ferroptosis and reverses the cisplatin resistance in OV cells by modulating Akt phosphorylation. Conversely, overexpression of SELENOI in OV cells enhanced therapeutic sensitivity to cisplatin by upregulating Akt phosphorylation. Importantly, in vivo studies demonstrated that SELENOI inhibition suppressed ovarian tumor growth and enhanced cisplatin's anticancer effects. These findings highlight the significant role of SELENOI in OV by modulating ferroptosis and chemotherapy resistance. Targeting SELENOI represents a promising therapeutic approach to promote the efficacy of platinum‐based chemotherapy in OV, particularly in cases of resistance. Graphic summary of targeting SELENOI for promoting ferroptosis and reversing chemoresistance in ovarian cancer. Inhibition of SELENOI activated unsaturated fatty acid synthesis and impaired Akt phosphorylation, resulting in the upregulation of ACSL4 expression and induction of ferroptosis. Reduced Akt phosphorylation also led to the downregulation of ALDH3A1 expression, a key gene associated with cisplatin‐resistance, thereby enhancing cisplatin cytotoxicity in SELENOI‐silenced ovarian cancer cells.
研究领域:
肿瘤学
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分子生物学
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癌症治疗
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转化医学
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yuying Zheng,Hengtong Zhan,Haibo Tang,Junming Luo,Dai Dang,Ting Shu,Jianwei Ren,Xinlong Tian,Shijun Liao
In this study, a novel low-Pt core-shell catalyst is successfully prepared by depositing ultrathin Pt layer on the carbon nanotubes supported titanium nitride nanoparticles (TiN@Pt/CNTs) via a facile pulse electrochemical deposition approach. The catalyst is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), High-angle annular dark field (HAADF) and energy-dispersive spectrometer (EDS) elemental mapping, X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. The results confirm the core-shell structure of the prepared TiN@Pt/CNTs catalyst. More importantly, the catalyst exhibits superb mass activity and durability for the methanol oxidation reaction (MOR) than that of the commercial JM Pt/C catalyst. Later experiments data demonstrate that the activity and stability of the catalyst can be further enhanced via copper doping, which results from the modified electronic structure of the Pt atoms and the synergistic effects of the core-shell structure.
研究领域:
材料科学
·
电化学
·
催化领域
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yannan Hai,Ying Chang,Jingchun Jia,Aiju Xu,Meilin Jia
Glycerol electrooxidation (GOR) is a safe and clean method for conversion of glycerol. In the course of this work, a series of Pt x Ce/C catalysts have been synthesized by successive polyol reduction methods as well as etching and calcination . Various physicochemical characterrisation and electrochemical measurements have demonstrated the excellent performance of Pt 3 Ce/C composites in glycerol oxidation (GOR) and hydrogen evolution reactions (HER). The Pt 3 Ce/C catalyst showed better performance in GOR and HER compared to commercially available Pt/C electrocatalysts . This paper demonstrates an energy efficient electrocatalyst for the simultaneous precipitation of hydrogen from glycerol oxidation.
研究领域:
电化学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yanhu Li,Mei Chen,Linghong Xue,Xu Li,Qingji Wang
Metal oxide semiconductor (MOS) sensor, one of the most widely used gas sensors, faces significant challenges in achieving lower detection limit. Addressing this issue, the utilization and strategic design of bimetallic catalysts present a promising avenue. In this paper, Pd-Pt was in-situ grown on ZnO nanoflowers directly prepared on planar substrate and a sensor for detecting acetone was developed. The test results reveal that the Pd-Pt/ZnO nanoflowers sensor exhibits a remarkable 107.6 response to 100 ppm acetone at 350 °C, while presenting a rapid response (15s). Moreover, this sensor demonstrates excellent capability in detecting acetone at concentrations as low as 1 ppb, showcasing impressive gas-sensing performance. The response of the sensor to 100 ppm acetone is twice that of ethanol at the same concentration. The exceptional performance of the sensor results from its distinctive nanoflower structure and the catalytic effect of the Pd-Pt, which offers an extensive surface area and enhances the rate of redox reaction for gas molecules. This in-situ grown method has great potential for improving the gas-sensing performance in gas sensor.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）