JOURNAL OF ORGANIC CHEMISTRY
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2018
·
IF 4.805
Chao Zhang,Yugang Song,Zhihui Sang,Lingpeng Zhan,Yu Rao
A strategy combining O- and N-containing directing groups has been developed for the synthesis of 2,2′-biaryl via Pd-mediated C–H bond activation and oxidative coupling. This new transformation may proceed through a mechanism involving Pd(II) and Pd(IV) intermediates. We found the use of PTSA and HFIP to be critical for the reaction and suggest that these reagents could serve as efficient ligands for this C–C bond formation. This methodology provides broad functional group tolerance, excellent reactivity, and high yields.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
He Jiang,Haoliang Wei,Xinkai Li,Yijun Zhang,Tingjiang Lu,Feili Li,Shuang Song,Yan Yu,Meilan Pan,Weiting Yu
The widespread discharge of halogenated organic pollutants (HOPs) in wastewater brings significant risks to the environment and human health due to potent high toxicity, antibacterial activity, and strong biodegradation resistance. Adsorbed atomic hydrogen (H* ads )-mediated electrocatalytic hydrodehalogenation (EHDH) has been recognized as an efficient strategy for HOPs removal through selectively breaking carbon-halogen bonds. In this work atomic Pd uniformly anchored on molybdenum disulfide (denoted as Pd-MoS 2 ) was synthesized through a facile hydrothermal method and found with state-of-the-art specific activity in florfenicol (FLO) removal via the H* ads -mediated EHDH process. Pd-MoS 2 completely dehalogenated (∼100 %) FLO within 30 min at a rate constant of 0.15 min −1 , which was 6.0, 6.5 and 33.1 times the value of MoS 2 , Pd/C and carbon paper samples, respectively. Notably, the toxicity of the wastewater was reduced to 1/6 of its original value after the treatment. Moreover, Pd-MoS 2 presented superior catalytic stability in five successive cycles. Furthermore, Pd-MoS 2 was also robust in complex water environment with practical applicability for industrial wastewater treatment. A dual-active-center mechanism with enhanced H* ads production capacity and the improved H* ads utilization efficiency was contributed to the increased EHDH activity on Pd-MoS 2 .
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2011
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IF 3.384
Baosong Fu,Xiaowen Zhu,Guomin Xiao
High activity ultrafine Pd catalyst was synthesized by both functional polymer encapsulated and impregnation methods. Catalysts were characterized and used to catalyze solvent-free aerobic toluene oxidation. Reaction temperature, time, catalyst mass, air pressure and catalyst reusability were investigated. Catalyst synthesized by encapsulating and immobilizing Pd inside titanium oxide is more active and has a better reusability.
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
Journal of Energy Chemistry
·
2016
·
IF 2.322
Qi Wang,Neeraj Gupta,Guodong Wen,Sharifah Bee Abd Hamid,Dang Sheng Su
Vanillyl alcohol, which is made up of an aromatic ring , an alcoholic hydroxyl group, a phenolic hydroxyl group and a methoxy group, was selected as the model molecule of lignin. Various carbon materials supported Pd catalysts were chosen to catalyze the HDO of vanillyl alcohol. The catalysts were characterized via TEM, TPD, XRD, XPS and CO-chemisorption. It was found that different carbon materials could obviously influence the particle sizes, dispersion and distribution of Pd or PdO particles. Palladium and carbon can synergistically catalyze the room-temperature HDO of vanillyl alcohol even at room temperature, and the carboxyl group was found to be the effective active acid site during the reaction. Possible reaction mechanism was also proposed. The existence of the effective active acid sites on the carbon supports could obviously lower the reaction temperature without decreasing the selectivity, as a result, making the production of renewable fuels by HDO much more economically feasible, which is of much importance.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2014
·Vol. 28
·期 8
·635-640
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IF 2.017
Xiaohua Zhao,Xiang Liu,Ming Lu
Low-melting β-cyclodextrin/ N -methylurea (NMU) mixture, an efficient catalytic system for ligand-free Suzuki and Heck couplings in the presence of fresh native β-CD-capped Pd 0 nanoparticles, has been successfully reported. This natural and convenient system can be performed in air and could afford the corresponding cross-coupled products in good to excellent isolated yields after a simple workup under every low Pd loading (0.05 mol%). Remarkably, the catalytic system can be recycled and reused without loss of catalytic activity. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
化学
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 5
·期 4
·2300-2304
·
IF 5.426
Gang Feng,Ping Chen,Hui Lou
Phenol is an important component of pyrolysis bio-oil, especially from lignin, and the conversion of phenol is crucial for the production of biofuel. A cost-effective and efficient catalyst is worth developing in the hydrogenation of phenol. Herein we report that supported palladium nanoparticles on carbon–nitrogen composites with high surface area are highly active for aqueous-phase hydrogenation of phenol. The conversion of phenol was 91.7% within 1 h at 80 °C. Higher activity was achieved at higher temperature. The synergy between palladium nanoparticles and the carbon–nitrogen composite support accelerated the hydrogenation of phenol, which clarified the crucial role played by the support. The hydrogenation of phenol highlights the potential of these catalysts for upgrading bio-oil.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Qunfeng Zhang,Wei Xu,Xiaonian Li,Dahao Jiang,Yizhi Xiang,Jianguo Wang,Jie Cen,Stephen Romano,Jun Ni
The preparation of supported palladium sulfides catalysts has attracted much attention due to their good sulfur-resistant properties in the hydrogenation of sulfur-containing compounds. In this work, we unambiguously demonstrated that Pd/C catalyst could be in situ sulfided by organic sulfur-containing reactant molecules and the sulfidation was highly dependent on temperature. The in situ sulfidation of Pd/C catalyst was composed of a reaction of Pd with the sulfur derived from the cleavage of C S bond of sulfur-containing reactant molecules, followed by a transformation to Pd x S y at high temperatures (around 120 °C). The sulfided Pd/C catalyst could be used for at least 18 recycles without a significant loss in its activity during the hydrogenation of sulfur-containing nitrobenzene at 180 °C with 3 MPa H 2 , which could be attributed to the stable presence of Pd 4 S and Pd 16 S 7 .
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2017
·Vol. 11
·期 2
·1109-1123
·
IF 7.354
Liang Ruowen,Huang Renkun,Ying Shaoming,Wang Xuxu,Yan Guiyang,Wu Ling
A simple, facile in situ reduction approach is reported for the synthesis of Pd-nanoparticle-decorated phosphotungstic acid (PTA)-MIL-100(Fe) nanocomposites (Pd-H 3 PW 12 O 40 -MIL-100(Fe), denoted Pd-PTA-MIL-100(Fe)). During the in situ synthesis, PTA is encapsulated into the matrix of MIL-100(Fe) and serves as a UV-switchable reducing agent, resulting in highly dispersed Pd NPs. Using the photocatalytic degradation of pharmaceuticals and personal care products as model reactions, the ternary Pd-PTA-MIL-100(Fe) hybrids exhibited enhanced photocatalytic activity compared with their foundation matrices, the binary PTA-MIL-100(Fe) nanocomposite. Based on photoelectrochemical analyses, the improved photocatalytic performance can be attributed to the well-known electronic conductivity of the Pd NPs, the fast electron transport of PTA, the intense visible-light absorption of MIL-100(Fe), and the matched energy levels of the three components: MIL-100(Fe), PTA, and Pd NPs. Importantly, almost no Fe and W ions were leached from the samples during the reaction, demonstrating the photostability of the Pd-PTA-MIL-100(Fe) composite. In addition, possible photocatalytic reactions mechanisms have also been investigated.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Jianqiang Zhang,Yongsheng Peng,Wenguang Leng,Yanan Gao,Feifei Xu,Jinling Chai
We introduced bipyridine ligands into a series of two-dimensional (2D) covalent organic frameworks (COFs) using 2,2′-bipyridine-5,5′-dicarbaldehyde (2,2′-BPyDCA) as a component in the mixed building blocks. The framework of the COFs was formed by the linkage of imine groups. The ligand content in the COFs was synthetically tuned by the content of 2,2′-BPyDCA, and thus the amount of metal, palladium(II) acetate, bonded to the nitrogen ligands could be manipulated. Both the bipyridine ligands and imine groups can coordinate with Pd(II) ions, but the loading position can be varied, with one ligand favoring binding in the space between adjacent COFs′ layers and the other ligand favoring binding within the pores of the COFs. The Pd(II)-loaded COFs exhibited good catalytic activity for the Heck reaction.
研究领域:
材料化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Xiaomeng Li,Ming Wen,Dandan Wu,Qingsheng Wu,Jiaqi Li
For the exploration of catalysts with excellent performance in alkaline fuel cells, high-performance two-dimensional (2D) Pd-on-NiCu nanosheets were synthesized through the kinetics controlling synthesis of NiCu nanosheets followed by Pd nanoparticles (NPs) embedding treatment at room temperature. In which case, well-dispersed Pd NPs with the average diameter of ∼4 nm are embedded on NiCu nanosheets (BET surface area of 180.7 m 2 g −1 ). Pd-on-NiCu nanosheets exert remarkable high performance in electrocatalytic activity, methanol-tolerance and stability, the electrocatalytic mass activity of Pd-on-NiCu nanosheets is 1827 mAmg −1 , which is over 6-fold higher than that of commercial Pd/C (289 mAmg −1 ), and the current density of the electrocatalyst decreases after 300 cycles of only 6%. Therefore, Pd-on-NiCu nanosheets can be considered as one of the most promising candidates for fuel cells applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Kai Cai,Yuxiang Liao,Huan Zhang,Jiawei Liu,Zhicheng Lu,Zhao Huang,Shengli Chen,Heyou Han
Here, we, for the first time, synthesized Pd nanotubes covered by high-density Au-islands, in which abundant exposed Pd–Au heterojunction interfaces are present and the content of element Au can be easily controlled. The optimized nanostructures show remarkably enhanced activity for catalyzing different alcohols in alkaline media than commercial Pd/C. The mass activity is 9.66, 1.83, and 4.60 A mgmetal–1 toward the electrooxidation of ethanol, glycerol, and ethylene glycol in alkaline media, which is about 6, 4, and 7 times that of Pd/C, respectively. Additionally, a model was proposed to explain the relationship between the structure and the catalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 72
·18187-18192
·
IF 5.317
Jishi Chen,Liren Liu,Xu Liu,Lingwen Liao,Shengli Zhuang,Shiming Zhou,Jinlong Yang,Zhikun Wu
Graphical Double-crown Pd 4 (PET) 8 and Pd 5 (PET) 10 were successfully doped with gold through two Au atoms replacing one Pd atom with the other double-crown structure essentially unchanged. Au 4 Pd 2 (PET) 8 is the smallest chiral bimetal nanoclusters so far and it bears chirality originating from not only the helixed Au 4 Pd 2 S 8 framework but also unanimous R or S configuration of sulfur atoms in the enantiomer. Double-crown Ni, Pd, or Pt nanoclusters have attracted extensive interests due to their aesthetic structure and intriguing properties. However, their doping by other metals remains unknown until now. Herein, Pd 4 (PET) 8 and Pd 5 (PET) 10 (PET: SCH 2 CH 2 Ph) were successfully doped with gold and the doped nanoclusters were characterized by using multiple techniques such as mass spectrometry and X-ray crystallography. It is revealed that in the doping not one but two gold atoms replace one Pd with the other double-crown structure essentially unchanged, and the gold-doping results in the blue-shift of the maximum visible absorption, the increase of optical energy gap and the reduction of anti-aromaticity of monometal Pd nanoclusters. Importantly, it is found that Au 4 Pd 2 (PET) 8 nanocluster bears chirality originating from not only the helixed Au 4 Pd 2 S 8 framework, but also unanimous R or S configuration of sulfur atoms in the enantiomer. For the latter chirality origin, it was not previously reported or proposed. Au 4 Pd 2 (PET) 8 reported here also represents the smallest chiral bimetal nanocluster so far to the best of our knowledge. This work advances one step toward both the tailoring of group 10 metal nanoclusters by doping and the understanding of chirality origin for metal nanoclusters.
研究领域:
材料化学
·
纳米科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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