ELECTROANALYSIS
·
2016
·Vol. 29
·期 3
·682-685
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IF 2.471
Wei Hong,Changshuai Shang,Jin Wang,Erkang Wang
In this research, we reported an effective approach to prepare low cost and efficient electrocatalyst for the glycol electrooxidation. The synthetic process involves the replacement reactions between CuCl 2 /H 2 PdCl 4 and Ni nanospheres template. Through controlling the precursor ratio, the Pd/Cu/Ni ratio of the final trimetallic products can be tuned. The prepared electrocatalysts present a monodispersed nanospheres structure with a hollow cavity. The prepared Pd 41 Cu 27 Ni 9 shows the best catalytic activity (0.021 A cm −2 at 0.9 V vs. RHE) for glycol electrooxidation, which is much higher than that of the commercial Pd/C (0.0014 A cm −2 at 0.9 V vs. RHE).
研究领域:
材料科学
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电化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 31
·15920-15926
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IF 7.443
Pei Song,Jiu-Ju Feng,Fei-Ying Guo,Ai-Jun Wang
In this work, porous bimetallic palladium–silver (Pd63Ag37) alloy nanocorals were synthesized by a simple and facile one-pot polyol method. The composition and morphology of the nanocrystals were well controlled by changing the concentrations of the precursors. The obtained nanocrystals were mainly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and the Brunauer–Emmett–Teller method. Porous Pd63Ag37 nanocorals had an enlarged electrochemically active surface area (55.85 m2 g−1), and exhibited enhanced electrocatalytic activity and improved stability for glycerol oxidation reaction as compared to commercial Pd black, owing to the unique porous coral-like nanostructures and synergistic interactions of the alloyed bimetals.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2015
·
IF 3.564
Xiao-ning Ye,Qiang Lu,Wen-tao Li,Pan Gao,Bin Hu,Zhi-bo Zhang,Chang-qing Dong
A new technique was proposed to selectively produce nicotyrine, a valuable alkaloidal product, from catalytic fast pyrolysis of tobacco mixed with the Pd/C catalyst. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to investigate the effects of pyrolysis temperature and catalyst-to-tobacco ratio on the selective nicotyrine production. The actual nicotyrine yields under different reaction conditions were quantitatively determined. Moreover, the catalytic activity of the Pd/C catalyst was compared with those of the activated carbon (AC), Ru/C and Pd/SBA-15 catalysts. The results indicated that during the catalytic fast pyrolysis process, the Pd/C catalyst possessed promising dehydrogenation capability to selectively convert the nicotine in tobacco into the nicotyrine, and it performed much better than the other three catalysts. The maximal nicotyrine yield reached as high as 2.80 wt%, obtained at the pyrolysis temperature of 400 °C and catalyst-to-tobacco ratio of 2.
研究领域:
能源与环境科学
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化学工程
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植物化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Chunhua Zhang,Zhengyan Qu,Hong Jiang,Rizhi Chen,Weihong Xing
Phenol hydrogenation is a green route to prepare cyclohexanone, an intermediate for the production of nylon 66 and nylon 6. The development of high-performance catalysts still keeps a great challenge. Herein, the activated carbon (AC) was modified with an acidic material Nb 2 O 5 to adjust the microstructure and surface properties of AC, and the influences of the calcination temperature and Nb 2 O 5 content on the catalytic performance of the Pd/AC-Nb 2 O 5 catalysts for the phenol hydrogenation to cyclohexanone were investigated. The Nb 2 O 5 with proper content can be highly uniformly distributed on the AC surface, enhancing the acidity of the Pd/AC-Nb 2 O 5 catalysts with comparable specific surface area and Pd dispersion, thereby improving the catalytic activity. The hybrid Pd/AC-10Nb 2 O 5 -500 catalyst exhibits the synergistic effect between the Pd nanoparticles and AC-10Nb 2 O 5 , which enhances the catalytic activity for the hydrogenation of phenol. Furthermore, the as-prepared Pd/AC-10Nb 2 O 5 -500 catalyst shows good reusability during 7 reaction cycles.
研究领域:
化学工程
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催化材料
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DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Anting Ding,Chuanying Liu,Chengliang Xiao
Palladium and platinum are precious metals (PMs) used in industrial catalysis, and their green recycling is crucial but challenging. In this study, we aimed to create a novel leaching procedure for the environmentally friendly recovery of PMs using AlCl3·6H2O solution. We report here the use of a microwave-assisted AlCl3·6H2O solution to selectively recover Pd and Pt from spent catalysts. In a large-scale setting, our system can recover gram-scale Pd in a single batch. Electron paramagnetic resonance (EPR) and capture experiments revealed the hydroxyl radicals produced by proton dissociation and microwave coordination triggered the oxidative dissolution process. Microwave-assisted AlCl3·6H2O solution leaching and NaBH4 reduction recovered high-purity Pd and Pt separately. In scale-up experiments, the dissolution performance of the microwave-assisted AlCl3·6H2O solution for Pd remained almost unchanged after seven cycles. Our approach uses around 1/50 and 1/20 of the energy and chemical inputs of the conventional hydrometallurgy process, respectively. Strong acids, poisonous cyanide, and volatile organic solvents were not used during the recovery process, enabling an efficient and sustainable PM recovery process and promoting an advanced oxidation process (AOPs) technology for secondary resource recycling.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Chemistry-An Asian Journal
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2020
·Vol. 16
·期 2
·165-173
·
IF 4.056
Ying Duan,Yangyang Ma,Yanfu Xie,Dongmi Li,Dongsheng Deng,Chi Zhang,Yanliang Yang
The reasonable control of the dispersion of noble metals is an important topic for heterogeneous catalysts. In this manuscript, PdCu/C, AuCu/C and PdAuCu/C were prepared by the galvanic reduction method to ensure that Pd and Au follow the distribution of Cu nanoparticles. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectrometer elemental mappings and lines scans. Both the Pd and Au had very high dispersion no matter whether they were introduced individually or simultaneously. The Pd and Au were distributed mainly on the Cu nanoparticles as evidenced by the energy-dispersive spectrometer elemental mappings and lines scans. The reduction of 4-nitrophenol was used as a model reaction for the prepared catalysts. PdCu/C and AuCu/C showed high activity for this reaction compared to the literature, and the activity could be further increased by the introduction of Pd and Au in an appropriate ratio at the same time. The normalized reaction rate reached 2.005 s −1 mM −1 for the PdAuCu/C-2.0, in which the mole ratio of Pd to Au was 2.0.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yu-Chuan Jiang,Hui-Ying Sun,Ya-Nan Li,Jia-Wei He,Qi Xue,Xinlong Tian,Fu-min Li,Shi-Bin Yin,Dong-Sheng Li,Yu Chen
Methanol electrolysis is a promising strategy to achieve energy-saving and efficient electrochemical hydrogen (H2) production. In this system, the advanced electrocatalysts with high catalytic performance for both the methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) are highly desirable. Inspired by the complementary catalytic properties of rhodium (Rh) and palladium (Pd) for MOR and HER, herein, several Pd core–RhPd alloy shell nanodendrites (Pd@RhPd NDs) are synthesized through the galvanic replacement reaction between Pd nanodendrites (Pd NDs) and rhodium trichloride. For MOR, Pd@RhPd NDs exhibit Rh content-determined catalytic activity, in which Pd@Rh0.07Pd NDs have an optimal combination of oxidation potential and oxidation current due to the synergistic catalytic process of Pd/Rh double active sites. For HER, the introduction of Rh greatly improves the catalytic activity of Pd@RhPd NDs compared to that of Pd NDs, suggesting that Rh is the main activity site for HER. Unlike MOR, however, the HER activity of Pd@RhPd NDs is not sensitive to the Rh content. Using Pd@Rh0.07Pd NDs as robust bifunctional electrocatalysts, the as-constructed two-electrode methanol electrolysis cell shows a much lower voltage (0.813 V) than that of water electrolysis (1.672 V) to achieve electrochemical H2 production at 10 mA cm–2, demonstrating the application prospect of methanol electrolysis for H2 production.
研究领域:
材料科学
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电化学
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能源科学
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DOI
高影响因子
Catalysts
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2020
·Vol. 10
·期 3
·302
·
IF 3.52
Meng Guo,Zhen Wei,Jianming Yang,Zunyuan Xie,Weiqiang Zhang
In the palladium-catalyzed C−C coupling reaction, electron-rich phosphine ligands and a catalytic amount of catalyst loading are required in most cases. Herein, a bench-stable, easily modified and less toxic alkynone was utilized in palladium-catalyzed Sonogashira coupling to replace conventional phosphine ligands. With 1-(4-methoxyphenyl)-3-phenyl-2-yn-1-one (L2) as the ligand, catalyst loading was reduced to 5-10 ppm. In this newly developed catalytic system, a variety of (hetero)arene iodines and alkynes could be tolerated, resulting in good yields of the corresponding cross-coupling products.Keywords:α;β-alkynone;Pd-catalyzed C−C coupling;π-acidicity
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 4
·437
·
IF 2.935
Bing Zhang,Shixing Wang,Likang Fu,Libo Zhang
A new adsorbent was prepared via modified poly(glycidyl methacrylate) with 8-aminoquinoline (AQ-PGMA) for the recovery of Pd(II) from solution. The practical application values of AQ-PGMA, including efficiency, selectivity and reusability for the recovery of Pd(II), are proved by the various experiment parameters. The parameters include HCl concentration, adsorption time, initial Pd(II) concentration, coexisting ions and reused cycles. The prepared AQ-PGMA showed a high adsorbing capacity for Pd(II) (up to 267.90 mg/g) when the concentration of HCl is higher than 0.4 mol/L. The analysis of the adsorption process indicated that the adsorption kinetics followed a pseudo-second-order kinetic model and the adsorption isotherms obeyed the Hill model. The Hill model showed that one adsorption site on the AQ-PGMA could combine 1.45 Pd(II). In addition, the obtained adsorbent demonstrated good regenerative ability and satisfying selectivity for the recovery of Pd(II). The adsorption mechanism was dominated by the chelation and ion exchange reactions between amines/hydroxyl groups and Pd(II). The experiments confirmed that AQ-PGMA was efficient for recovery of Pd(II) from highly acidic aqueous solutions.Keywords:adsorption;palladium;efficiency;selectivity;reusability
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2019
·Vol. 9
·期 4
·387
·
IF 3.444
Bei Wang,Liu Tao,Yu Cheng,Fang Yang,Yuguang Jin,Chunmei Zhou,Hao Yu,Yanhui Yang
The direct alcohol fuel cell is a kind of power generation device that directly converts the chemical energy of small molecule alcohols into electric energy. In this paper, the electro-oxidation behaviors of some typical alcohols (methanol, ethanol, ethylene glycol, n-propanol, 2-propanol, and glycerol) over Pt, Pd, and Au electrodes were investigated in acidic, neutral, and alkaline media, respectively. By analyzing the activity information from a cyclic voltammetry (CV) method and some dynamic tests, several regularities were revealed in those electro-oxidation behaviors. Firstly, alkaline media is the best for the electro-oxidation of all these alcohols over Pt, Pd, and Au catalysts. Secondly, the hydrogen bond donation abilities (HBD) of different alcohols were found have a great relationship with the catalytic performance. In alkaline media, on Pt electrodes, the solute HBD is positively correlated with the ease of electrooxidation within the scope of this experiment. Contrarily, it is negatively correlated on Pd and Au electrodes. Additionally, for Pt catalysts in acidic and neutral media, the relationship becomes negative again as the HBD increases. Finally, the alcohol’s molecular structure properties were found to have a remarkably influence on the activity of different catalysts. Over the Pt electrode in alkaline media, the activation energy of methanol oxidation is 44.1 KJ/mol, and is obviously lower than the oxidation of other alcohols. Under similar conditions, the lowest activation energy was measured in the oxidation of n-propanol (14.4 KJ/mol) over the Pd electrode, and in the oxidation of glycerol (42.2 KJ/mol) over the Au electrode. Totally, among all these electrodes, Pt electrodes showed the best activities on the oxidation of C1 alcohol, Pd electrodes were more active on the oxidation of C2-3 monobasic alcohols, and Au electrodes were more active on the oxidation of polybasic alcohols.Keywords:DAFCs;electro-oxidation;gold;palladium;platinum
研究领域:
化学
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材料科学
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催化反应
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Siteng Rong,Hongzi Tan,Zhaobin Pang,Zhiyuan Zong,Rongrong Zhao,Zhihe Li,Zhe-Ning Chen,Ning-Ning Zhang,Weiming Yi,Hongyou Cui
Lignin could be depolymerized into large amount of phenolic compounds via fast pyrolysis . The upgrade of phenolic compounds via hydrodeoxygenation (HDO) involves multiple reaction pathways. It is challenging to selectively remove the oxygen-containing groups while keeping the aromatic rings intact. In this work, hierarchical Nb 2 O 5 (H–Nb 2 O 5 ) microspheres with abundant oxygen vacancies were synthesized to anchor the Pd clusters, which is featured with strong metal-support interaction via the electron transfer between Pd species and Nb species. For phenol HDO reaction, the oxygen vacancies were prone to interact with the phenolic hydroxy groups, resulting in phenol molecule adsorbed in a “nonplanar” manner, greatly weakening the C Ar -O bonds and averting the ring hydrogenation. Besides, the activated hydrogen atoms on Pd clusters could migrate to the vicinity of oxygen vacancies via spillover, promoting the cleavage of C Ar -O bond to obtain benzene. Current work provides a deep insight into the synergetic catalytic mechanism of Pd/H–Nb 2 O 5 catalyst for phenol HDO reaction, and also sheds light on the design and synthesis of high-efficient catalysts in other heterogeneous catalysis fields.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Xiaoning Meng,Mingshu Bi,Qiuping Xiao,Wei Gao
With the emergence of hydrogen economy worldwide and the increase of safety problems caused by the highly flammable and explosive characteristics of hydrogen (H 2 ), it is urgent to develop the portable sensors that can sensitively and quickly detect H 2 leaks. In this work, the H 2 sensing characteristics of Pd/SnS 2 /SnO 2 nanocomposites synthesized via hydrothermal route as well as impregnation route were systematically investigated for the first time. The influence of different SnS 2 and Pd loading on the H 2 sensing performances of SnO 2 nanoparticles was revealed by varying the addition levels of thiourea and palladium chloride. The H 2 sensing experimental results demonstrated that SnS 2 and Pd modification can greatly enhance the sensing capabilities of SnO 2 , where 1.0 at% Pd/SnS 2 /SnO 2 sensor exhibited high response (95) and rapid response/recovery time (1/9 s) to 500 ppm H 2 at 300 ℃, thus outperforming the current reported sensing performances of SnO 2 -based H 2 sensors. The superior sensing characteristics of Pd/SnS 2 /SnO 2 were attributed to the simultaneous synergistic effect of the three components. This study will supply a rational strategy for designing high sensitive and rapid response H 2 sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
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