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Deep oxidation in propane oxidative dehydrogenation to propene over V_2O_5/γ-Al_2O_3 studied by in-situ DRIFTS

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Journal of Natural Gas Chemistry 2009年第3期18卷 359-364页

作者： Yunbing He Hongbing Ji Jianhua Xu lefu wang School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China

In-situ DRIFTS was used to study the deep oxidation of propane, a side reaction during propane oxidative dehydrogenation to propene. Strong adsorption of propene was supposed to be the main reason for the deep oxidation. It was found that gaseous oxygen in the feed and the reaction temperature had great influence on the reaction. To obtain a relative high selectivity to propene, the reaction temperature should be maintained at 150-250℃ with a proper content of gaseous oxygen in the feed for a certain catalyst and some modifiers which could weaken the adsorption of propene on the catalyst surface would be favorable.

关键词： propane propene oxidative dehydrogenation in-situ DRIFTS deep oxidation

Composite electrolytes based on poly(ethylene oxide) and binary ionic liquids for dye-sensitized solar cells

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Science China Chemistry 2012年第8期55卷 1608-1613页

作者： YU YingHao JIANG Peng wang FuRong wang lefu LI XueHui State Key Laboratory of Pulp&Paper Engineering School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China

The sunlight is the largest single available source of clean and renewable energy to ensure human society＇s sustainable devel- opment. Owing to their low production cost and high energy conversion efficiency, dye-sensitized solar cells （DSSCs） have been regarded as good alternatives to conventional photovoltaic devices. Herein, a series of composite electrolytes based on poly（ethylene oxide）（PEO） and the binary ionic liquids 1-propyl-3-methy-imidazolium iodide （[PMIm]I） and l-ethyl-3- methylimidazolium thiocyanate （[EMIm][SCN]） were prepared and then applied to fabricate six DSSCs. The composite elec- trolytes were characterized by fourier transform infrared spectroscopy （FTIS）, X-ray diffraction （XRD）, and electrochemical impedance spectra （EIS）. It was shown that the addition of binary ionic liquids would reduce the degree of crystallinity of PEO thus improving the ionic conductivities of the electrolytes by about 2 orders of magnitude. Investigation on the photovoltaic performances of these DSSCs showed that the fill factor （FF） could reach up to 0.67 and energy conversion efficiency （η） could reach up to 4.04% under AM 1.5 full sunlight （100 mW/cm^2）.

关键词： solar energy dye-sensitized solar cell PEO binary ionic liquid composite electrolyte

Ionic liquids: Efficient solvent and medium for the transformation of renewable lignocellulose

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Science China Chemistry 2012年第8期55卷 1500-1508页

作者： LONG JinXing LI XueHui wang lefu ZHANG Ning State Key Laboratory of Pulp&Paper Engineering School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Department of Chemistry Nanchang UniversityNanchang 330047China

Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly covalent structure and strong intra and in- ter-molecular hydrogen bonding in lignoceUulose make it high recalcitrance to transformation due to the poor solubility in wa- ter or common organic solvents. Dissolution and transformation of lignocellulose and its constituents in ionic liquids have therefore attracted much attention recently due to the tunable physical-chemical properties. Here, ionic liquids with excellent dissolving capability for biomass and its ingredients were examined. The technologies for lignocellulose biorefining in the presence of ionic liquid solvents or catalysts were also summarized. Some pertinent suggestions for the future catalytic conver- sion and unitization of this sustained carbon-rich resource are proposed.

关键词： ionic liquids lignocellulose dissolution biorefinery

Cumene Liquid Oxidation to Cumene Hydroperoxide over CuO Nanoparticle with Molecular Oxygen under Mild Condition

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Journal of Natural Gas Chemistry 2007年第4期16卷 393-398页

作者： Meiying Zhang lefu wang Hongbing Ji Bing Wu Xiaoping Zeng Analytical and Testing Center South China University of Technology Guangzhou 510650 Guangdong China School of Chemical and Energy Engineering South China University of Technology Guangzhou 510650 Guangdong China

CuO nanoparticle was synthesized via wet chemical method and was characterized diffraction （XRD）, nitrogen adsorption-desorption, and scanning electron microscopy （SEM） by X-ray Catalytic oxidation of cumene with molecular oxygen was studied over CuO nanoparticle. The catalysts showed markedly higher activities as compared to CuO prepared by conventional method, CuO/Al2O3, or homogeneous copper catalyst under comparable reaction conditions. The cumene conversion, cumene hydroperoxide （CHP） yield, and selectivity using 0.25 g CuO nanoparticle catalyst and 0.1 mol cumene at 358 K for 7 h were 44.2%, 41.2% and 93.2%, respectively. The catalyst can be recycled. After 6 recycled experiments, no loss of catalytic activity was observed.

关键词： nanoparticle CuO cumene liquid oxidation

Storage-Reduction of NO_(x)over Combined Catalysts of Pt/Ba/Al_(2)O_(3)-Mn/Ba/Al_(2)O_(3):Carbon Monoxide as Reductant

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Journal of Natural Gas Chemistry 2007年第2期16卷 213-216页

作者： Sha Deng Xuehui Li Jianhua Xiao Furong wang lefu wang School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 Guangdong China

Storage-reduction of NOx by carbon monoxide was investigated over combined catalysts of Mn/Ba/Al2O3-Pt/Ba/Al2O3. Combination of Mn/Ba/Al2O3 and Pt/Ba/Al2O3 catalysts in different ways showed excellent NOx storage-reduction performance and the content of Pt could be reduced by 50%. Not only the addition of 5Mn/15Ba/Al2O3 to 1Pt/15Ba/Al2O3 could improve its storage ability, but also enhance the NOx conversion consequently. NOx conversion over the combined catalysts （the combined catalysts Ⅰ and Ⅱ） was increased under dynamic lean-rich burn conditions, the maximum NOx conversion increased from 69.4% to respectively 78.8% and 75.7% over two combined catalysts.

关键词： nitrogen oxides storage-reduction lean burn combined catalyst

Room-Temperature Suzuki-Miyaura Reaction Catalyzed by Palladium Nanoparticles in Lactate-Anion Ionic Liquid

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中国化学:英文版 2014年第12期32卷 1225-1232页

作者： Furong wang Sisi Tang Hao Ma lefu wang Xuehui Li Biaolin Yin School of Chemistry and Chemical Engineering State Key Laboratory of Pulp and Paper Engineering of ChinaSouth China University of TechnologyGuangzhouGuangdong 510640China

A palladium nanoparticle catalyst(PdNPs@[Bmim]Lac)has been prepared by a simple,mild and efficient chemical approach using 1-butyl-3-methylimidazolium lactate([Bmim]Lac)ionic liquid)as a *** catalyst exhibits excellen... 详细信息

关键词： palladium nanoparticles room temperature Suzuki-Miyaura reaction lactate anion ionic liquid

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金属络合物的相转移催化与分离

有机化学 2003年第6期23卷 513-517页

作者：纪红兵王乐夫华南理工大学化工学院广州510640

以可简单分离回收、可反复使用为目标 ,详细介绍了相转移催化的变化发展过程 .通过对溶剂的选择 ,使得催化剂选择性地溶解在某一液相中 ,而使产物溶解在另一液相中 ,如水 -有机两相催化体系 ;通过温度的变化 ,简单地实现了在较高温度下... 详细信息

以可简单分离回收、可反复使用为目标 ,详细介绍了相转移催化的变化发展过程 .通过对溶剂的选择 ,使得催化剂选择性地溶解在某一液相中 ,而使产物溶解在另一液相中 ,如水 -有机两相催化体系 ;通过温度的变化 ,简单地实现了在较高温度下反应为均相体系以提高催化剂的活性 ,而在较低温度下实现了催化剂与产物不相溶使得催化剂得以简单分离 ,如温控型水 -有机两相催化体系、氟 -有机两相催化体系、温控型含氟催化剂、温控型有机金属催化剂等 .

关键词：金属络合物相转移催化分离催化剂两相催化体系

藏北新生代玄武质火山岩起源的深部机制——大陆俯冲和板片断离驱动的地幔对流上涌模式

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岩石学报 2017年第10期33卷 3011-3026页

作者：迟效国张蕊范乐夫王利民吉林大学地球科学学院长春130061

近年来地震层析成像揭示出可可西里-西昆仑中新世-第四纪钾质火山岩带下方存在一个深达900km的巨型地幔低速体,空间上与新特提斯洋和印度大陆俯冲断离板片沉降形成的冷地幔下降流共存(Replumaz et al.,2010a,b),两者构成统一的地幔对流... 详细信息

近年来地震层析成像揭示出可可西里-西昆仑中新世-第四纪钾质火山岩带下方存在一个深达900km的巨型地幔低速体,空间上与新特提斯洋和印度大陆俯冲断离板片沉降形成的冷地幔下降流共存(Replumaz et al.,2010a,b),两者构成统一的地幔对流体系。研究表明,羌塘古近纪(60~34Ma)钠质玄武岩和高钾钙碱性玄武岩均以富含Ti O2、P2O5和大离子亲石元素为特征,主体具有与OIB相近的微量元素组成和弱亏损的Sr、Nd同位素特征,指示岩浆起源于软流圈的上涌熔融,但Nb、Ta的弱亏损表明岩浆源区有岩石圈地幔熔融组分的贡献。羌塘(32~26Ma)碱性钾质玄武岩与可可西里和西昆仑中新世以来喷发的钾质玄武岩的地球化学性质相近,不相容元素比值和Sr、Nd同位素组成指示岩浆起源于古俯冲地幔楔的低程度熔融。这些特征表明藏北软流圈上涌作用始于古近纪,初始上涌中心位于羌塘地体之下。计算表明藏北古近纪火山岩距离当时的印度大陆北缘的最大和最小距离约为1250km和700km,与现今可可西里地幔低速体的南、北边界与印度大陆北缘的距离相近,支持羌塘古近纪地幔上涌作用也是受藏南冷地幔下降流所驱动。青藏高原在南北缩短过程中不仅表现为软流圈自西向东挤出流动,地幔垂向对流也是其重要的运动形式,在地幔上升流形成的藏北热幔区内,地壳的水平缩短增厚与岩石圈地幔的伸展减薄呈脉动式共存。藏南冷地幔下降流和藏北热地幔上升流的持续北移是导致藏北后碰撞火山岩时空迁移的主要控制因素。

关键词：俯冲板片断离后碰撞火山岩地幔对流岩石圈地幔减薄青藏高原北部

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一步法催化氧化正辛醇生成正辛酸

化工学报 2005年第9期56卷 1673-1678页

作者：纪红兵钱宇何笃贵王乐夫华南理工大学化工学院广东广州510640

开发了利用分子氧作为惟一氧化剂、高效一步法氧化正辛醇到辛酸的固体RuCo(OH)2CeO2催化剂.使用了XRD和XPS等表征手段分析了老化温度对催化剂结构的影响,认为催化剂中存在CeO2和Co(OH)2两种微晶结构,Ru以较高的四价氧化态很好地分散在... 详细信息

开发了利用分子氧作为惟一氧化剂、高效一步法氧化正辛醇到辛酸的固体RuCo(OH)2CeO2催化剂.使用了XRD和XPS等表征手段分析了老化温度对催化剂结构的影响,认为催化剂中存在CeO2和Co(OH)2两种微晶结构,Ru以较高的四价氧化态很好地分散在催化剂中.元素Ru、Co和Ce之间的协同效应对于在温和条件下从正辛醇到正辛酸一步法转化起着高效的促进作用.该反应的机理为首先从正辛醇到辛醛的β消除,随后从辛醛到正辛酸的自由基历程.

关键词：正辛醇一步法氧化反应机理