燃油选择性吸附脱硫的多孔材料研究进展

吸附脱硫技术具有操作条件温和、节能、不改变燃油品质和成本低等特点而备受关注。针对噻吩类难脱除硫化物的深度脱除和转化问题，综述了近年来应用多孔吸附材料选择性吸附超深度脱除燃油中噻吩类硫化物的作用机理及最新研究进展。重点分析了分子筛、金属有机骨架、多孔炭材料、复合材料等不同吸附剂的研究现状，并探讨了各种吸附材料的吸附机理、改性方式和优缺点。本文指出分子筛因优异的热稳定性、高比表面积、均一的孔道结构、低成本和易于工业化等特点，是目前最具优势的吸附剂材料。未来研究应着重阐明吸附机理、提高合成便捷性、脱硫性能以及再生能力，更全面系统的研究将为开发具有理想选择性和再生能力的高效吸附剂奠定基础。     

Functionalized polythiophenes: Recognition materials for chemosensors and biosensors of superior sensitivity,selectivity, and detectability

Recent progress in derivatized polythiophenes (PTs) and polymerized thiophene derivatives is reviewed, with emphasis on applications that involve devising and fabricating selective and sensitive chemo- and biosensors. The literature results summarized show that appreciable selectivity is attained if derivatized polythiophene films are used as recognition units. Illustrative examples include determination of polyatomic anions and metal cations, volatile organic compounds, and biocompounds including glucose and nucleic acids. Moreover, progress is presented in the use of derivatized thiophenes as functional monomers for preparation of molecularly imprinted polymers (MIPs) for chemosensing. Thanks to the range of synthetic procedures developed for preparation of derivatized PTs, these electronically conducting polymers have served as excellent recognition units for fabricating highly sensitive and selective chemosensors for target analytes.     

Synthesis and characterization of 9,10-[di-p-(7-diethylamino- coumarin-3-yl) thiopheneyl]anthracene as fluorescent material

A novel N-coumarin derivative, namely 9,10-[di-p-(7-diethylamino-coumarin-3-yl) thiopheneyl]anthracene ((CTh)₂A), containing anthracene as the core and 3-thiophene N-coumarin as the substituent was synthesized, and its structure was confirmed by ¹H NMR and IR spectroscopies. The optical, electrochemical and thermal properties were investigated. Thermogravimetric analysis and PL spectra reveal the high thermal and good photoluminescence characteristics. The coumarin derivative exhibits blue photoluminescence with high fluorescence quantum yield in solution (up to 40%). The results show that the derivative would serve as promising organic light-emitting diode luminescent material.     

Thieno[3,2-b]thiophene as π-bridge at different acceptor systems for electrochromic applications

Benzoselenadiazole, quinoxaline and thieno[3,2-b]thiophene are the units preferred in conducting polymers due to their electrochemical properties. There are no reports in the literature on polymers containing both moieties. In this study, novel benzoselenadiazole, quinoxaline and thieno[3,2-b]thiophene based monomers; 4-(3a,6a-dihydrothieno[3,2-b]thiophen-2-yl)-7-(thieno[3,2-b]thiophenyl)benzo[c][1,2,5]selenadiazole (BSeTT) and 2,3-bis(3,4-bis(decyloxy)phenyl)-5,8-dibromo-2,3-dihydroquinoxaline (QTT) were synthesized via Stille Coupling and polymerized electrochemically. These polymers were characterized in terms of their spectroelectrochemical and electrochemical properties by cyclic voltammetry and UV–Vis–NIR spectroscopy. Spectroelectrochemistry analysis of PBSeTT revealed an electronic transition at 525 nm corresponding to π–π* transition with a band gap of 0.93 eV whereas PQTT revealed electronic transitions at 440 and 600 nm corresponding to π–π* transitions with a band gap of 1.30 eV. Electrochromic investigations showed that PBSeTT has gray color PQTT switching between green and gray. Switching time of the polymers was evaluated by a kinetic study upon measuring the percent transmittance (%T) at the maximum contrast point.     

Phase equilibria and structural properties of thiophene/[Bmim][BF4]: A molecular insight from monte carlo simulations

The phase equilibria of thiophene in 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([Bmim][BF₄]) is calculated by Monte Carlo simulation in Gibbs ensemble using a united atom force field. The liquid density of studied ionic liquid and the vapor pressure of thiophene in [Bmim][BF₄] were compared with corresponding experimental data reported in the literature, and a good agreement was obtained. In order to describe the solubility of thiophene in this ionic liquid, we have calculated the radial distribution functions and spatial distribution functions of thiophene/IL mixtures to study the interaction of thiophene with cations and anions of [Bmim][BF₄] in the liquid phase. The local composition concept in fluid was also examined to give further insight into the liquid structure. The results show that thiophene is well organized around the terminal carbon atom of the butyl or methyl chain attached to the imidazolium ring of cations and tends to adopt a symmetrically distribution on the anions. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3916–3924, 2014     

含噻吩的共轭微孔聚合物的合成与表征

以对溴碘苯为原料,通过Sonogashira偶联反应,Suzuki偶联反应,八羰基二钴催化的三聚反应,FeCl3氧化关环反应,成功合成了一种未见文献报道的含噻吩的六苯基苯共轭微孔聚合物,该共轭微孔聚合物经XRD测试为无序结构,TG研究结果表明热稳定性良好;其最大吸收峰位于380 nm处,发射出黄色荧光,该共轭微孔聚合物较单体波长发生红移,是聚合后链长增加共轭效应增强的结果。     

Chitosan Schiff base as effective corrosion inhibitor for mild steel in acid medium

An environment friendly inhibitor, chitosan thiophene carboxaldehyde Schiff base, was synthesized by a condensation reaction of the carbonyl group of thiophene 2‐carboxaldehyde and free amino groups of chitosan. The chitosan Schiff base was characterized by UV spectroscopy, Fourier transform IR spectroscopy, elemental analysis and thermal analysis. The surface morphology of the Schiff base derivative was examined by SEM. Gravimetric and electrochemical techniques were used to explore the behaviour of the chitosan thiophene derivative as a corrosion inhibitor for mild steel in an acidic environment. The effects of inhibitor concentration, exposure time and temperature were investigated. The chitosan Schiff base showed a good inhibition performance of 92% inhibition efficiency at room temperature for 12 h of immersion in a weight loss experiment. The electrochemical results showed that the chitosan derivative acts as an effective mixed type inhibitor. The adsorption of the inhibitor followed the Temkin isotherm model. SEM and AFM techniques were used to characterize the protective layer formed on the mild steel substrate. © 2016 Society of Chemical Industry     

硫转移组合催化剂在FCC汽油脱硫中的应用

针对以FCC汽油为原料生产国Ⅴ标准汽油带来的辛烷值损失过大的问题,开发出一种硫转移组合催化剂,可减少辛烷值损失,同时降低硫含量至小于10μg·g~(-1)。研究反应温度、反应压力、空速及不同催化剂组合方案对脱硫和辛烷值损失的影响,并进行100 h的稳定性实验。结果表明,在反应温度150℃、反应压力2.0 MPa和空速3 h~(-1)条件下,催化剂A在上层、B在下层的组合方式的催化剂硫转移能力较好,稳定性良好。