Bio-Inspired Aerobic-Hydrophobic Janus Interface on Partially Carbonized Iron Heterostructure Promotes Bifunctional Nitrogen Fixation

Competition from hydrogen/oxygen evolution reactions and low solubility of N₂ in aqueous systems limited the selectivity and activity on nitrogen fixation reaction. Herein, we design an aerobic-hydrophobic Janus structure by introducing fluorinated modification on porous carbon nanofibers embedded with partially carbonized iron heterojunctions (Fe₃C/Fe@PCNF-F). The simulations prove that the Janus structure can keep the internal Fe₃C/Fe@PCNF-F away from water infiltration and endow a N₂ molecular-concentrating effect, suppressing the competing reactions and overcoming the mass-transfer limitations to build a robust “quasi-solid–gas” state micro-domain around the catalyst surface. In this proof-of-concept system, the Fe₃C/Fe@PCNF-F exhibits excellent electrocatalytic performance for nitrogen fixation (NH₃ yield rate up to 29.2 μg h⁻¹ mg⁻¹_cat. and Faraday efficiency (FE) up to 27.8 % in nitrogen reduction reaction; NO₃⁻ yield rate up to 15.7 μg h⁻¹ mg⁻¹_cat. and FE up to 3.4 % in nitrogen oxidation reaction).     

Graphene Liquid Marbles as Photothermal Miniature Reactors for Reaction Kinetics Modulation

We demonstrate the fabrication of graphene liquid marbles as photothermal miniature reactors with precise temperature control for reaction kinetics modulation. Graphene liquid marbles show rapid and highly reproducible photothermal behavior while maintaining their excellent mechanical robustness. By tuning the applied laser power, swift regulation of graphene liquid marble’s surface temperature between 21–135 °C and its encapsulated water temperature between 21–74 °C are demonstrated. The temperature regulation modulates the reaction kinetics in our graphene liquid marble, achieving a 12‐fold superior reaction rate constant for methylene blue degradation than at room temperature.     

Efficient Direct Synthesis of Indole over Novel Ag/SiO2 Catalyst

Indole is an important heterocycle substance which could be used to produce indigo dye, perfume, forage additive and tryptophan[1～3]. Although there are some methods to produce indole[4], one of the most promising routes, from an industrial point of view, seems to be the direct synthesis from aniline and ethylene glycol[5]. This is a one step reaction from reactants to indole and the starting materials are inexpensive.     

Preparation,morphology, and biolabeling of fluorescent nanoparticles based on conjugated polymers by emulsion polymerization

Novel nanoparticles based on conjugated polymer with good fluorescent properties were synthesized by Suzuki coupling reaction using certain surfactants as one kind of special emulsion polymerization. The luminescent properties of the prepared nanoparticles could be controlled by selecting different monomers. Without using substances comprising any heavy metal element, these fluorescent nanoparticles show very good biocompatibility with cells, thus showing potential applications in cell biolabeling, drug delivery tracing, organic light‐emitting diodes, flat displays, and other areas. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010     

Synthesis and characterization of fluorene‐based rod–coil liquid crystal polymers

A series of fluorene‐based rod–coil liquid crystal polymers with different lengths of the coil segments on backbones were designed and synthesized by a palladium‐catalyzed Suzuki coupling‐reaction. The thermal stability, the UV–Vis absorption and fluorescence spectra in chloroform solution and thin film, the electrochemical properties, thermal behavior, and morphology of these rod–coil polymers were investigated. The thermal stability of these polymers steadily decreased on increasing the length of the coil segments on the backbone; their optical and electrochemical properties did not exhibit noticeable dependence on the weight fraction of the coil segments. However, the shoulder emission and the full width at the half‐maximum (FWHM) in PL spectra of the films increased, whereas the oxidation onset potentials and the corresponding HOMO energy levels decreased with the increase in the weight fraction of the coil segments, which was assigned to microphase separation and formation of folded chain conformation as the weight fraction of the coil segments increased. These polymers displayed a characteristic liquid crystalline texture. The variation of the weight fraction of the coil segments obviously affected the thermal behavior and morphology of these rod–coil polymers. Copyright © 2008 John Wiley & Sons, Ltd.     

FCC汽油中含硫化合物在Ce交换的Y型分子筛上的吸附

 研究了NaY分子筛在与硝酸铈溶液进行液相离子交换前后对含有大量芳烃和烯烃的FCC汽油的吸附脱硫. 结果表明,在室温和常压下,以离子交换方式将Ce3+引入到Y分子筛中后,分子筛吸附剂对FCC汽油的脱硫选择性明显提高,并且脱硫选择性随分子筛中Ce3+含量的增多而提高. 噻吩吸附的红外光谱表明,在Ce3+改性后的分子筛吸附剂上存在着噻吩分子直接以硫原子与吸附剂相互作用的吸附模式,这种不同于π络合的吸附方式可能不易受FCC汽油中竞争分子的影响,因此分子筛表现出较高的吸附脱硫选择性.     

Pd-H4SiW12O40基催化剂上乙烯直接氧化合成乙酸

The direct oxidation of ethene to acetic acid has the advantages of abundant raw materials and low cost of equipment[1],hence the research for this process has been of much interest in industry application.     

NiSOF／γ—Al2O3对丙烯齐聚反应的催化行为

ＮｉＳＯ４／γ－Ａｌ２Ｏ３的酸性强烈影响其催化丙烯齐聚的活性。ＣＯ中毒实验和ＥＳＲ表征证明，在反应过程中有Ｎｉ＾＋产生，并成为反应的活性中心。推测ＮｉＳＯ４／γ－Ａｌ２Ｏ３上丙烯齐聚反应除通过酸中心上酸催化进行外，还通过Ｎｉ＾＋上配位催化进行。