Yong Wang

Zhejiang University, Hang-hsien, Zhejiang Sheng, China

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Publications (68)261.13 Total impact

  • Xuan Xu, Haoran Li, Yong Wang
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    ABSTRACT: In this report, a kind of mesoporous N-doped carbon (CN-x) derived from N-containing ionic-liquid (IL) precursors were synthesized, and Pd@CN-x prepared by a simple ultrasound-assisted method showed higher catalytic activity for the selective hydrogenation of phenol and its derivatives under mild reaction conditions in water than commercial Pd@C and other common Pd heterogeneous catalysts. The catalytic activities of Pd@CN-x derived from different ILs were different, and further study into the influencing factors, including physical properties, N species of CN-x, and Pd status of Pd@CN-x, were performed.
    ChemCatChem 09/2014; · 5.18 Impact Factor
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    ABSTRACT: Hydrothermal carbonization (HTC) of carbohydrate is an interesting candidate for the preparation of carbon materials, as it provides an easy, inexpensive and environmental friendly route. However, it is difficult to prepare porous carbon materials by a straight HTC process. Herein, the solubilising technology of micelles was introduced to direct the HTC of fructose by using an amphiphilic block copolymer, poly-(4-vinylpyridine)-block-poly-(ethylene glycol) (P4VP-PEG), as a structure-directing agent. By this strategy, hierarchical porous carbon materials with tunable properties were prepared. It was investigated that P4VP-PEG micelles could solubilize fructose and confine the formation of primary carbon domains during a sol-gel process. And the micelle size could be adjusted easily by changing the preparation conditions. Accordingly, the particle size of the obtained carbon materials was effectively tuned from 20 to 100 nm by the direction of the primary micelle size. After calcination, the hierarchical porous carbon materials were evidenced as effective electrode materials for supercapacitor with a capacitance of ~197 F at 1 A g-1, which was almost four times higher than the carbon materials prepared by a straight HTC process.
    Nanoscale 09/2014; · 6.73 Impact Factor
  • Haiyan Wang, Yutong Gong, Yong Wang
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    ABSTRACT: Carbon aerogels have attracted considerable attention in fundamental investigation and potential applications in a myriad of fields. We present a novel approach for the synthesis of cellulose-based carbon aerogels by dissolution, gelation, regeneration, freeze-drying and carbonization of cellulose. The carbon aerogels obtained here possess the characteristics of high surface area (500 m2 g-1), hydrophobicity, and fire-resistance. In addition, the carbon aerogels show excellent adsorption capacity and selectivity for removal of oils, organic solvents, a variety of dyes, and heavy ions, so they could be used as promising adsorbents for sewage treatment. Especially for malachite green and Cu (II), the adsorption capacities can reach up to 1947 mg g-1 and 801 mg g-1, respectively, which far surpass other aerogels previous reported.
    RSC Advances 09/2014; · 3.71 Impact Factor
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    ABSTRACT: Monodisperse, uniform colloidal carbonaceous spheres were fabricated by the hydrothermal treatment of glucose with the help of tiny amount of sodium polyacrylate (PAANa). This synthetic strategy is effective at high glucose concentration and scale-up experiments. The sphere size can be easily tuned by the reaction time, temperature and glucose concentration.
    Chemical Communications 09/2014; · 6.38 Impact Factor
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    ABSTRACT: Pd@N-doped carbon (Pd@CN) exhibited four and two times higher peak current density toward ethanol electrooxidation than Pd@active carbon and Pd@non-nitrogen carbon. Controlled experimental results indicated that the incorporation of nitrogen into the carbon matrix improved the percentage of Pd0 and increased the binding energy of Pd in Pd@CN, and accordingly enhancing the catalytic activity.
    Chemical Communications 08/2014; · 6.38 Impact Factor
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    ABSTRACT: Palladium nanoparticles supported on a N-doped hierarchically porous carbon, Pd/CNx, has been developed as a highly efficient, reusable and environmentally benign heterogeneous catalyst for the selective hydrogenation of various α, β-unsaturated carbonyls to their corresponding saturate carbonyls at mild conditions (303 K, atmospheric H2). Complete conversion of a series of α, β-unsaturated carbonyls with excellent selectivity (>99%) was achieved within 4 h. Moreover, the catalyst can be easily recovered by centrifugation and withstands recycling up to 8 times without apparent loss of activity and selectivity. The considerable catalytic performance is attributed to the hierarchically porous network and incorporation of nitrogen atoms. This catalytic system opens up an efficient, selective, recyclable and sustainable method for selective hydrogenation process.
    Catal. Sci. Technol. 08/2014;
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    ABSTRACT: The development of meaningful ways to transfer biomass into useful materials, more efficient energy carriers, and/or carbon storage deposits is a profound challenge of our days. Herein, an ionothermal carbonization (ITC) method, via treating natural resources (glucose, cellulose and sugarcane bagesse) in non-metal ionic liquids (ILs) at ~200 oC, is established for the fabrication of porous heteroatom-doped carbon materials with high yield. Commercial ILs with bulky bis(trifluoromethylsulfonyl)imide anion or cross-linkable nitrile group were found to be efficient and recyclable templates for porosity control, leading to exciting nano-architectures with promising performance in oxygen reduction reaction. The optimized ILs (12 mL) can dissolve and directly convert up to 15 g glucose into porous carbon materials (SBET: 272 m2/g) one time. This ITC method relies on the synergistic use of structure-directing effect, good biomass solubility and excellent thermal stability of ILs, and provides a sustainable strategy for exploiting biomass.
    ACS Applied Materials & Interfaces 07/2014; · 5.90 Impact Factor
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    ABSTRACT: A novel and sustainable synthesis of Pd/CN0.041@MgO catalyst is presented here, offering a bifunctional catalyst with high catalytic activity towards a tandem aldol condensation-hydrogenation reaction of furfural with acetone in a one-pot reactor. The incorporation of biomass based hydrophilic N-containing carbon (CN0.041) in the catalyst provides a subtle but elegant method to control the well dispersion in water, the reaction stability, and ultrafinely dispersed palladium particles (2.2 nm in average size) of the bifunctional catalyst Pd/CN0.041@MgO.With such improved features, an impressive 99% furfural conversion and 95% hydrogenation products (saturated ketones) selectivity was obtained by using Pd/CN0.041@MgO as a novel bifunctional catalyst in the present tandem reaction. This catalyst designing strategy and the high efficiency of the catalyst in the catalytic system offer potentials for bi/multifunctional catalysts preparation and one-pot synthesis of bioderived intermediates.
    Green Chemistry 06/2014; · 6.83 Impact Factor
  • Pengfei Zhang, Haoran Li, Yong Wang
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    ABSTRACT: Described here is the feasible modification of a graphitic carbon nitride polymer using Prato's reaction with in situ formed azomethine ylides. These novel carbon nitrides with designable organic functional groups, and tailorable surface and structure properties illustrated excellent performance in the selective oxidation of 3,5,5-trimethylcyclohex-3-en-1-one using atmospheric oxygen.
    Chemical Communications 05/2014; · 6.38 Impact Factor
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    ABSTRACT: Due to their versatile features and environmental friendliness, functionalized carbon materials show great potential in practical applications, especially in energy conversion. Developing carbon composites with properties that can be modulated by simply changing the ratio of the original materials is an intriguing synthetic strategy. Here, we took cyanamide and multiwalled carbon nanotubes as precursors and introduced a facile method to fabricate a series of graphitic carbon nitride/carbon nanotubes (g-C3N4/CNTs) composites. These composites demonstrated different practical applications with different weight ratios of the components, that is, they showed synergistic effects in optoelectronic conversion when g-C3N4 was the main ingredient and in oxygen reduction reaction (ORR) when CNTs dominated the composites. Our experiments indicated that the high electrical conductivity of carbon nanotubes promoted the transmission of the charges in both cases.
    ChemSusChem 04/2014; · 7.48 Impact Factor
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    ABSTRACT: Oxidized sulfur and nitrogen co-doped graphitic carbon (SN-G) was one-step synthesized simply by annealing a solid mixture of D-glucosamine hydrochloride, melamine, and trithiocyanuric acid. By tailoring the additive dosage and the pyrolysis temperature, correlations between the structure, composition, and electrochemical performance of SN-G were systematically elucidated. To our excitement, the SN3-G sample pyrolyzed at 900 °C with a dominant oxidized sulfur content exhibited striking electrocatalytic activity in alkaline medium, which was free from the crossover effect, and its long-term durability was superior to that of commercial Pt/C (20 wt %). Furthermore, oxidized sulfur that was reported to be chemically inactive for the ORR was proven to be active, which was supported by both experimental results and density functional theory calculations.
    ChemCatChem 03/2014; · 5.18 Impact Factor
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    ABSTRACT: Pd-nanoparticles supported on mesoporous graphitic carbon nitride is found to be an effective, heterogeneous catalyst for the liquid-phase semihydrogenation of phenylacetylenes under mild conditions.
    ChemInform 01/2014; 45(3).
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    ABSTRACT: Fabrication of hierarchically porous carbon materials (HPCs) with high surface area and pore volume has always been pursued. However, the currently effective template methods and acid/base activation strategies suffer from the drawbacks of either high costs or tedious steps. Herein, HPCs with 3D macro-mesopores and short-range meso-micropores were fabricated via an easy and sustainable two-step method from biomass. Macro-mesopores were constructed by slightly accumulation/aggregation of carbon spheres ranging from 60 nm to 80 nm, providing efficient mass diffusion pathways. Short-range mesopores and micropores with high electrolyte accessibility were developed in these spheres by air activation. The obtained HPCs showed surface area values up to 1306 m(2)/g and high mesopore volume proportion (63.9%). They demonstrated excellent capacitance and low equivalent series resistance (ESR) as supercapacitor electrode materials, suggesting the efficient diffusion and adsorption of electrolyte ions in the designed hierarchically porous structure.
    Scientific reports. 01/2014; 4:6349.
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    ABSTRACT: The selective oxo-functionalization of hydrocarbons under mild conditions with molecular oxygen as the terminal oxidant continues to be a hot topic in organic synthesis and industrial chemistry. Though many oxidation protocols in combination with transition metal salts, enzymes, organometallic catalysts, or organocatalysts have been summarized recently, a review that focuses solely on the metal-free allylic/benzylic oxidation strategies with molecular oxygen is still unavailable. This critical review will summarize recent significant advances achieved in this important field under the scope of green chemistry, which covers the promising applications and brief mechanistic profiles involving three kinds of efficient catalysts, namely N-hydroxyimides, homogeneous/heterogeneous light-sensitive molecules, and heteroatom-doped carbon materials, and concerns the sustainability of these methods, as well as predicts the potential utilization of available but unreported analogous catalysts or catalytic systems in this field. Special emphasis will also be placed on the burgeoning metal-free strategies with visible light irradiation from the long-term greenness and sustainability of these oxidation processes due to their established appealing performances under ambient conditions.
    Green Chemistry 01/2014; · 6.83 Impact Factor
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    ABSTRACT: Honeycomb-like N-doped hollow carbon hemispheres are synthesized by a facile and versatile process, using ionic liquids as the carbon source. The resulting materials show a unique hollow hemisphere morphology, outstanding electrochemical activity, strong immunity towards methanol crossover and stability superior to the commercial Pt/C catalyst in alkaline medium.
    J. Mater. Chem. A. 12/2013; 2(3).
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    ABSTRACT: Mesoporous poly(ionic liquid)s with zwitterionic structures have been successfully prepared. This synthesis made use of a facile template-free approach via precipitating an organic solution of an imidazolium-based poly(ionic liquid) homopolymer in a straightforward manner into ammonia-containing organic solvents. The complex products have a specific surface area up to 260 m2 g−1, and exist in a robust nanoparticle form. They could serve as active catalysts for the chemical fixation of CO2.
    Polymer Chemistry 07/2013; 4:5048. · 5.23 Impact Factor
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    ABSTRACT: The liquid phase selective hydrogenation of phenol to cyclohexanone has been investigated over polymeric mesoporous graphitic carbon nitride (mpg–C3N4) supported Pd catalysts (Pd@mpg-C3N4). This Pd@mpg-C3N4 is shown to be highly active and promotes the selective formation of cyclohexanone (99%), an industrially important compound, in a “one-step” method. The effects of different variables like solvent, reaction temperature, catalyst texture and catalyst pre-treatment are presented and discussed. The different adsorption capacity of mpg–C3N4 between the phenol and cyclohexanone is suggested to strongly promote the chemoselective reduction of phenol to cyclohexanone and avoid the deep hydrogenation of cyclohexanone to cyclohexanol. The hydrogenation kinetics has been adequately represented by a standard pseudo-first-order approximation, and isotopic tracing study and the transition state calculation were applied for the discussion of the possible reaction mechanism.
    RSC Advances 06/2013; 3(27):10973-10982. · 3.71 Impact Factor
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    Angewandte Chemie 06/2013; 125(23).
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    ABSTRACT: Pores for thought: Porous nitrogen-doped carbon materials (HTC Carbon with PILs) composed of spherical nanoparticles, and also those with Au-Pd core-shell nanoparticles embedded (Au-Pd@N-Carbon) were synthesized. These materials can be prepared from sugars by hydrothermal carbonization (160-200 °C) in the presence of poly(ionic liquid)s (PILs), which act as a stabilizer, pore-generating agent, and nitrogen source.
    Angewandte Chemie International Edition 04/2013; · 11.34 Impact Factor
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    ABSTRACT: Existing phenol production mostly by cumene processes is a three-step route with unwanted acetone as by-product. Here, we report the FeCl3 and mesoporous carbon nitride hybrid (FeCl3/mpg-C3N4) as an active and selective photocatalyst to activate H2O2 for the oxidation of benzene to phenol under visible-light illumination. By fine-optimizing FeCl3 loading amount in catalyst and reaction conditions, the one-step process achieved a 38% benzene conversion with 97% selectivity for phenol. The excellent catalytic performance of FeCl3/mpg-C3N4 should be attributed to the fast reduction of Fe3+ to Fe2+ by photo-irradiated electrons from mpg-C3N4. To further understand the reaction route, several electron spin resonance (ESR) tests were carried out, confirming mpg-C3N4 promoted redox cycle of Fe2+/Fe3+ in the FeCl3/mpg-C3N4 system. Based on these results, a catalytic mechanism for the oxidation of benzene by FeCl3/mpg-C3N4 hybrids was provided. This environmental-friendly and efficient method is expected to open up a new avenue for one-step phenol preparation.
    RSC Advances 03/2013; 3(15):5121-5126. · 3.71 Impact Factor

Publication Stats

349 Citations
261.13 Total Impact Points

Institutions

  • 2004–2014
    • Zhejiang University
      • Department of Chemistry
      Hang-hsien, Zhejiang Sheng, China
  • 2010–2012
    • Max Planck Institute of Colloids and Interfaces
      • Department of Colloid Chemistry
      Potsdam, Brandenburg, Germany
    • University of Oklahoma
      • Department of Economics
      Norman, Oklahoma, United States
  • 2011
    • Qufu Normal University
      Küfow, Shandong Sheng, China
  • 2009–2011
    • The Hong Kong University of Science and Technology
      Chiu-lung, Kowloon City, Hong Kong
    • University of Chicago
      • Department of Economics
      Chicago, IL, United States