等离子体法由二甲醚合成柴油添加剂

二甲氧基乙烷;制备;等离子体法由二甲醚合成柴油添加剂     

激光促进LiClO4·Pb3(PO4)2复合物表面上的乙烷氧化脱氢反应

 制备了LiClO4,Pb3（PO4）2和LiClO4·Pb3（PO4）2复合物催化剂,用XRD和IR表征了催化剂的晶相及表面结构,并用化学吸附IR和TPD研究了催化剂样品对乙烷的化学吸附性能,用LSSR考察了乙烷氧化脱氢生成乙烯的反应规律．结果表明,催化剂表面的ClO和PO键是乙烷的主要吸附位．LiClO4与Pb3（PO4）2的相互作用促进了ClO键对乙烷的吸附活化能力．在一定反应条件下,乙烷转化率与体系的能量利用率有关,复合物催化剂比单纯的LiClO4和Pb3（PO4）2可更有效地利用激光光能．温度对LSSR反应有一定的辅助作用．     

Precision synthesis of regioregular poly(3‐hexylthiophene) with low dispersity using a zincate complex catalyzed by nickel with the ligand of 1,2‐bis(dicyclohexylphosphino)ethane

Regioregular poly(3‐hexylthiophene) (P3HT) has been a commonly used p‐type semiconducting material for solution processable organic electronics. To establish a living system of “Negishi‐type catalyst‐transfer polycondensation (NCTP)” using zincate complex as a synthetic method for well‐defined P3HT having predictable molecular weight (MW) and low dispersity (?), the ligands of Ni catalyst were optimized. As a result, a ligand of 1,2‐bis(dicyclohexylphosphino)ethane produced P3HTs with highly controlled number average MWs (1650–32,800) and very low ? values (1.03–1.17). The polymerization results were strongly influenced by steric hindrance based on the factors of cone angle and bite angle of Ni catalysts, and/or electron‐donating ability of phosphine ligands. In addition, we succeeded in the two‐stage polymerization of P3HT and the synthesis of P3HT‐b‐poly(3‐octadecylthiophene), the latter of which is the first demonstration by NCTP using zincate complex. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 2287–2296     

Molecular structure and reactivity of titania-supported transition metal oxide catalysts synthesized by equilibrium deposition filtration for the oxidative dehydrogenation of ethane

The molecular structure and catalytic performance of (MoO_x)_n/TiO₂, (WO_x)_n/TiO₂ and (VO_x)_n/TiO₂ catalysts (synthesized by the equilibrium–deposition–filtration/EDF method) for oxidative dehydrogenation (ODH) of ethane were studied by in situ Raman spectroscopy at 430 °C and catalytic measurements in the temperature range of 420–480 °C. The extent of association within the deposited oxometallic phase followed the sequence (VO_x)_n/TiO₂ >> (MoO_x)_n/TiO₂ > (WO_x)_n/TiO₂; a concurrent trend in reduction susceptibility was evidenced by exploiting the relative normalized Raman band intensities while monitoring the response of the vibrational properties of the catalytic samples under reactive (C₂H₆/O₂/He) and reducing (C₂H₆/He) conditions by in situ Raman spectroscopy. The catalyst reactivity tracks the corresponding trend in reduction susceptibility as evidenced by the in situ Raman spectra. Selective reaction pathways are favored at high coverage whilst combustion routes are activated at low coverages due to the involvement of carrier lattice oxygen sites. The observed apparent reaction rates and activation energies are discussed in relation to various structural and reactivity aspects.     

Synthesis and characterization of a novel organic–inorganic hybrid salt and its application as a highly effectual Brønsted–Lewis acidic catalyst for the production of N,N′‐alkylidene bisamides

In this research, a novel organic–inorganic hybrid salt, namely, N¹,N¹,N²,N²‐tetramethyl‐N¹,N²‐bis(sulfo)ethane‐1,2‐diaminium tetrachloroferrate ([TMBSED][FeCl₄]₂) was prepared and characterized by Fourier‐transform infrared spectroscopy (FT‐IR), energy‐dispersive X‐ray spectroscopy (EDX), elemental mapping, field emission scanning electron microscopy (FE‐SEM), X‐ray diffraction (XRD), thermal gravimetric (TG), differential thermal gravimetric (DTG), and vibrating‐sample magnetometry (VSM) analyses. Catalytic activity of the hybrid salt was tested for the synthesis of N,N′‐alkylidene bisamides through the reaction of benzamide (2 eq.) and aromatic aldehydes (1 eq.) under solvent‐free conditions in which the products were obtained in high yields and short reaction times. The catalyst was superior to many of the reported catalysts in terms of two or more of these factors: the reaction medium and temperature, yield, time, and turnover frequency (TOF). [TMBSED][FeCl₄]₂ is a Brønsted–Lewis acidic catalyst; there are two SO₃H groups (as Brønsted acidic sites) and two tetrachloroferrate anions (as Lewis acidic sites) in its structure. Highly effectiveness of the catalyst for the synthesis of N,N′‐alkylidene bisamides can be attributed to synergy of the Brønsted and Lewis acids and also possessing two sites of each acid.     

One-Pot Synthesis of 1-(E)-Phenylethenyl-1,2,3-Triazoles by Sequential Click-Elimination Reaction from 2-Azido-1-Phenyl-1-(Phenylseleno)Ethane

Abstract

A new convenient one-pot, two-step procedure involving sequential click chemistry and oxidation-elimination reaction for the preparation of 1,4-disubstituted 1,2,3-triazoles bearing 1-(E)-phenylethenyl group from 2-azido-1-phenyl-1-(phenylseleno)ethane is described. The prominent features of this protocol are mild reaction conditions, operational simplicity, and good to high yields of products, as well as avoidance of the isolation of the selenated intermediate.

Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures.     

乙烷／丙烷混合工质流动沸腾传热研究

对乙烷、丙烷纯质及三种不同浓度比例的乙烷／丙烷二元混合物在内径为8mm的水平管内进行了饱和流动沸腾传热特性的实验研究,重点分析了热流密度、质量流量的变化对二元混合工质传热系数的影响。选用了4种专用于计算混合物流动换热的关联式,并与实验数据进行了比较,其中Gungor—Winterton and Thome关联式和Zou...     

Solubility of ethane int-butanol + water mixtures and a hydrophobic interaction study

The solubilities of ethane int-butanol (TBA) and water mixtures have been determined at 10, 15, and 20°C and pressures up to 3.1 MPa. Thermodynamic properties have also been calculated based on the measured solubility data and the hydrophobic interaction for the methane-methane pair interaction in the mixed solvent is discussed.     

推算乙烷系氟里昂饱和液体粘度的基因贡献法

推算乙烷系氟里昂饱和液体粘度的基因贡献法吕萍，刘志刚（西安交通大学能动学院西安７１００４９）关键词基团贡献，粘度，乙烷系氟里昂１引言ＣＦＣＳ物质很快将被禁用，寻找合适的替代物已成为当务之急。在ＣＦＣＳ替代物的研究中粘度是必不可少的迁移性质之一。ＣＦＣ...