CHINESE CHEMICAL LETTERS
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2010
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IF 0.643
Jing Cao,Jun Xiang Feng,Yong Xiang Wu,Ya Ya Tuo
“One-step” method for the synthesis of secondary aliphatic amine substituted nitrobenzaldehyde was developed. In the presence of Pd catalyst, halogenated nitrobenzaldehyde could be smoothly coupled with secondary aliphatic amine to give the target product in hexamethylphosphamide (HMPT) media without the protection of aldehyde groups.
研究领域:
有机化学
·
药物化学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2014
·Vol. 88
·期 8
·1317-1322
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IF 0.488
Chen Guochang,Ye Mingfu,Qiao Hongbin,Qiu Xiaoning
An aryl alkyl ionic liquids with a tertiary amino group (N(CH 3 ) 2 ) in the cation were synthesized. As a ligand, the synthesized ionic liquids can coordinate with palladium to form N -heterocyclic carbene (NHC)-Pd complex which exhibited high efficiency in catalyzing Suzuki-Miyaura coupling reaction.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2016
·Vol. 16
·期 3
·3014-3020
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IF 1.338
Liu Xing-Quan,Chen Xue-Song,Wu Jian,Yao Lei
Three-dimensional (3D) Pd–Pt alloy with coral-like nanostructures were synthesized via bubble dynamic templated electrodeposition method at room temperature. The morphology of the asprepared nanostructures was characterized using scanning electron microscopy (SEM), EDS, high-resolution
transmission electron microscopy (HRTEM), respectively. Cyclic voltammetry method was adopted to evaluate the electrocatalytic activities of the synthesized electrodes toward oxygen reduction in KCl solution. The electrochemical results indicated that the Pd–Pt alloy with coral-like
nanostructures hold the high performance for oxygen reduction.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yakai Chen,Xinya Feng,Xiaohan Yu,Xingliang Xu,Jing Xu
Catalytic transfer hydrogenation of nitro compounds to amines under mild conditions offers an alternative strategy to traditional hydrogenation processes involving pressurized molecular hydrogen, which necessitate the rational design and integration of multifunctional catalyst. Herein, a ternary composite catalyst (Pd/CeO 2 -C 3 N 4 ) was designed and synthesized for the transfer hydrogenation of nitro compounds to corresponding amines compounds using formic acid as hydrogen donor. The Pd/CeO 2 -C 3 N 4 catalyst shows remarkably high performance for the catalytic transfer hydrogenation of nitrobenzene (NB) to aniline (BA), achieving > 98 % conversion and exceedingly high selectivity (>99 %). The catalyst exhibits a high turnover frequency (TOF) of up to 2868 h - , significantly surpassing both the reference catalyst (Pd/C 3 N 4 and Pd/CeO 2 ) and the conventional Pd/C catalyst. The multi-functional Pd/CeO 2 -C 3 N 4 catalyst features enhanced electron transfer properties,well-exposed Pd active sites, and abundant acid-base sites, enabling effective enhancement of formic acid dehydrogenation and nitro group activation. Moreover, Pd/CeO 2 -C 3 N 4 demonstrates excellent recyclability and a broad substrate scope for the catalytic transfer hydrogenation of various nitro compounds. The rational design of Pd/CeO 2 -C 3 N 4 will broaden the application range of Pd-based catalysts and provide a sustainable and effective approach for the catalytic transfer hydrogenation of other industrially relevant organic compounds.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yuanji Xiang,Jianwei Zhao,Lirong Qin,Bi Wu,Xiaolan Tang,Yingying Xu
Direct alcohol fuel cells (DAFCs) are renewable energy sources with the potential to replace fossil fuels. Investigating high-performance electrocatalysts that promote alcohol oxidation is critical. In this study, we demonstrate simple electrodeposition for the controlled synthesis of PdCo catalysts on Ni bowl-like micro/nano array films with the assistance of the monodisperse colloidal sphere template. The PdCo catalysts with the optimal properties was synthesized by optimizing the stirring rate of the electrolyte and the solution concentration. The Pd 8 Co 1 /Ni array film catalyst synthesized at a stirring speed of 200 Revolutions Per Minute (RPM) exhibited the highest electrochemical active surface area (ECSA, 95.65 cm 2 /mg) and specific and mass activities in methanol (173.2 mA/cm 2 and 2032.9 mA/mg Pd , respectively) and ethanol (240.1 mA/cm 2 and 2846.1 mA/mg Pd , respectively) oxidation in alkaline media. This was a considerable improvement compared to the electrocatalytic activities of single-phase Pd and a commercial Pd/C catalyst, and the superior performance of the Pd 8 Co 1 micro/nano array film could be attributed to the bowl-like structure with a high ECSA and the synergistic effect of Pd and Co. Therefore, this study yields necessary insights into the development of high-performance electrocatalysts with potential applications in DAFCs.
研究领域:
材料科学
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电催化
·
可再生能源
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DOI
高影响因子
Catalysis Science & Technology
·
2013
·Vol. 3
·期 10
·2620-2626
·
IF 3.753
Chunhui Chen,Ensheng Zhan,Na Ta,Yong Li,Wenjie Shen
Pd nanocubes of 6–19 nm in size were synthesized using a seeded growth method and examined for enantioselective hydrogenation of α,β-unsaturated carboxylic acids. It was found that the Pd nanocubes had two types of active sites on the planes and at the edges, respectively. Small nanocubes having a higher edge/plane ratio were more active in enantioselective hydrogenation of α,β-unsaturated carboxylic acids, but afforded a lower enantioselectivity because their sharp edges could not offer stable adsorption of the chiral modifier and the reaction intermediates. In contrast, large nanocubes with a higher fraction of flat planes provided a higher enantioselectivity but a much lower activity.
研究领域:
化学
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纳米材料科学
·
催化反应
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DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 9
·期 2
·286-301
·
IF 5.365
Mengyuan Zhang,Shipeng Wu,Longchun Bian,Qiue Cao,Wenhao Fang
Ce–Ni mixed oxides with different Ni/Ce molar ratios, promoted by a rather low amount of Pd (0.2 wt%), were prepared by a simple one-pot precipitation method. The thus-synthesized CeNiXOY and Pd–CeNiXOY catalysts were applied respectively to the direct N-alkylation of amine and alcohol via oxidative coupling, under O2 in the absence of basic additives. The CeNiXOY catalyst could provide a >99% yield of imine in the model alkylation reaction of aniline with benzyl alcohol at 100 °C. The Pd-promoted Pd–CeNiXOY catalyst surprisingly showed an enhanced imine yield (>99%) at a mild temperature of 60 °C. This catalyst exhibited good reusability, and moreover, demonstrated high performance towards imine synthesis from various amines with alcohols. The presence of Pd species and the Ni/Ce molar ratio showed a synergistic impact on the conversion of aniline, as well as on the product selectivity, which was believed to be related to the improvement on the intrinsic activity of the oxidation of benzyl alcohol to benzaldehyde. Various physicochemical techniques, including ICP-MS, XRD, N2 adsorption–desorption, UV-Raman, H2-TPR, TEM, EPMA and XPS, were employed to study mainly the composition, structure and redox properties of the catalysts. The proportion of Ce3+ species and oxygen vacancies, which can be manipulated by the Ce–Ni redox system and the interaction between Ce and Ni, was crucial to the selective activation of alcohols in the presence of reactive amines. The activation of alcohol on the highly reactive Pd0 species was the other crucial factor.
研究领域:
催化化学
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材料科学
·
绿色化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Xingjie Yang,Xubao Jiang,Muhammad Sohail Bashir,Xiang Zheng Kong
Polyurethanes (PUNs) have been widely used in many fields. However, there are few reports on their microsphere preparation through precipitation polymerization. Herein, uniform PUN microspheres are prepared by precipitation polymerization of toluene diisocyanate and trimethylolpropane, without any surfactant and stabilizer. Under optimized conditions, monomers are fully polymerized within 2 h at a monomer concentration as high as 25.0 wt %, with a high yield of the microspheres (96.9%). By loading Pd on their surface, composite microspheres Pd@PUN are obtained and used as catalysts. 4-Nitrophenol is completely reduced within 1 min, with a kinetic constant of 4.96 min–1, significantly higher than many reported Pd-loaded catalysts, and with comparable reusability. Used in degradation of dye molecules, the catalytic performance is practically unchanged after 20 recycled uses. This work provides a simple method for the preparation of highly uniform PUN microspheres with a high yield and their Pd-loaded catalysts, both of great potential for various applications.
研究领域:
材料科学
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催化化学
·
环境科学
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DOI
高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Zheng Hu,Hui Li,Wenbo Zhao,Wei Zhou,Shi Hu
Structural information in a disordered atomic system cannot be acquired from everyday X-ray diffractometers, so we have to resort to synchrotron resources. The pair distribution function from synchrotron X-ray and neutron scattering reflects the local bond information regardless of the crystallinity, but the limited access to these high-energy light resources prevents them from widespread use. Here, we develop a microstructure analysis framework to study immiscible binary alloys through the integration of local elemental segregation analysis, electron-based pair distribution function, the corresponding wavelet coherence spectrum, and ab initio level simulation. All the information can be obtained from an in-house transmission electron microscope equipped with an energy-dispersive spectroscope. A series of nanoparticles based on immiscible Pd-Ru alloys are chosen as model catalysts for the hydrogen evolution reaction, and the structure-performance relationship is established on the basis of the electrochemical tests and structural information from the analysis toolkit we developed.
研究领域:
材料科学
·
催化化学
·
电子显微学
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DOI
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 2
·1-10
·
IF 2.7
Liu Tianli,Zhang Jian,Xu Mingjie,Tian Chuanjin,Wang Chang-An
Sintering resistant noble metal nanoparticles are critical to the development of advanced catalysts with high activity and stability. Herein, we reported the construction of highly dispersed Pd nanoparticles loaded at the inner wall of ZrO 2 hollow spheres (Pd@HS-ZrO 2 ), which shows improved activity and thermal stability over references in the Pd-ZrO 2 (catalyst-support) system. Even after 800 °C high temperature calcination, the Pd nanoparticles and ZrO 2 hollow spheres did not undergo morphological changes. The Pd@HS-ZrO 2 manifests batter catalytic activity and thermal stability than the counterpart Pd/ZrO 2 catalysts. In comparison to Pd/ZrO 2 -800, Pd@ZrO 2 -800 exhibits a 25°C reduction in the temperature required for complete conversion of CO. The enhanced catalytic activity and thermal stability of Pd@HS-ZrO 2 can be attributed to the nanoconfinement effect offered by the 10 nm wall thickness of the ZrO 2 hollow spheres, which suppresses the coarsening of the Pd nanoparticles (active center for catalysis).
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jun Li,Xiaosi Liang,Liying Cai,Shuke Huang,Chenyang Zhao
Single atom alloys (SAA) have recently drawn increased attention due to their unique structure, high atomic utilization, and fascinating catalytic performance. However, their controllable synthesis still presents a challenge. This study proposes an electrochemical self-catalysis (ESC) strategy to synthesize Pd@Pt/C SAA catalysts, that is, depositing Pt atoms on Pd nanocrystals through in situ decomposition of sodium formate. The relationship between composition and structure of Pd@Pt/C is distinguished through a combination of electrochemical analysis, sphere-corrected scanning transmission electron microscopy, and X-ray adsorption spectra. That relationship evolved from SAA to a sea-island structure and even a core–shell structure with composition-controllable atomic ratios, highlighting the great diversity and convenience of this method in nanostructure construction. The Pd@Pt/C SAA catalyst showed excellent catalytic activity to formic acid oxidation with a peak current density of 5.2 A/mgmetal, which is about 18.6 times that of the commercial Pd/C. density functional theory calculations revealed that the enhanced activity was due to the “passivation” of Pd sites near the Pt single atoms, which attenuated the adsorption of CO. Based on electrochemical principles, this ESC strategy was also expanded to prepare a series of Pd-based SAA, including Pd–Au, Pd–Ir, and Pd–Bi.
研究领域:
材料科学
·
电化学
·
催化化学
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DOI
PubMed
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Xuan-Yu Yang,Zheng-Guang Zhao,Li-Juan Yue,Ke-Feng Xie,Gui-Xin Jin,Shao-Ming Fang,Yong-Hui Zhang
Pd-based materials have received remarkable attention and exhibit excellent H2 sensing performance due to their superior hydrogen storage and catalysis behavior. However, the synergistic effects originated from the decoration of Pd on a metal oxide support to boost the sensing performance are ambiguous, and the deep investigation of metal support interaction (MSI) on the H2 sensing mechanism is still unclear. Here, the model material of Pd nanoparticle-decorated WO3 nanosheet is synthesized, and individual fine structures can be achieved by treating it at different temperatures. Notably, the Pd-WO3-300 materials display superior H2 sensing performance at a low working temperature (110 °C), with a superior sensing response (Ra/Rg = 40.63 to 10 ppm), high sensing selectivity, and anti-interference ability. DFT calculations and detailed structural investigations confirm that the moderate MSI facilitates the generation of high mobility surface O2– (ad) species and a proper ratio of surface Pd0–Pd2+ species, which can significantly boost the desorption of intermediate PdHx species at low temperatures and contribute to enhanced sensing performance. Our work illustrates the effect of MSI on sensing performance and provides insight into the design of advanced sensing materials.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
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