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| 1 | Alkylation of Isobutane and Isobutene in Acidic Polyether Ionic Liquids显示文摘The Br?nsted-acidic polyether ionic liquids(ILs)with different polymerization degrees(n value)were prepared via the reaction of tetramethylguanidine and epoxy ethane,followed by successive reactions with 1,3-propane sultone and trifluoromethanesulfonic acid(TfOH).The prepared ILs were characterized by infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy,and their thermal stability was determined by thermal gravimetry.The synthesized polyether ILs coupled with TfOH were used to catalyze the alkylation reaction of isobutane and isobutene for the preparation of alkylate gasoline.The polyether ILs could improve the substrate dissolution and promote the separation of the catalyst from the products.The ideal IL(n=94)was determined.The optimized alkylation reaction conditions covered:a VTfOH/VIL ratio of 0.35,a reaction temperature of 40℃,a reaction time of 50 min,and a stirring speed of 800 r/min.The conversion of isobutene was 92.4%and the selectivity for the C8-product was 81.6%.Under optimal conditions,the catalyst life was determined and TfOH showed improved cyclic performance in the polyether ILs.After 8 operating cycles,the catalytic activity of the catalyst showed negligible decline. | Yu Fengli Gu Yulong Liu Qichun Xie Congxia | 2019 | China Petroleum Processing & Petrochemical Technology2019，21，3： | 2 |
| 2 | Interactive response of photosynthetic characteristics in Haloxylon ammodendron and Hedysarum scoparium exposed to soil water and air vapor pressure deficits显示文摘C4 plants possess better drought tolerance than C3 plants. However, Hedysarum scoparium, a C3 species, is dominant and widely distributed in the desert areas of northwestern China due to its strong drought tolerance. This study compared it with Haloxylon ammodendron, a C4 species, regarding the interactive effects of drought stress and different leaf–air vapor pressure deficits. Variables of interest included gas exchange, the activity levels of key C4 photosynthetic enzymes, and cellular anatomy. In both species, gas exchange parameters were more sensitive to high vapor pressure deficit than to strong water stress, and the net CO2 assimilation rate(A n) was enhanced as vapor pressure deficits increased. A close relationship between A n and stomatal conductance(g s) suggested that the species shared a similar response mechanism. In H. ammodendron, the activity levels of key C4 enzymes were higher, including those of phosphoenolpyruvate carboxylase(PEPC) and nicotinamide adenine dinucleotide phosphate-malate enzyme(NADP-ME), whereas in H. scoparium, the activity level of nicotinamide adenine dinucleotide-malate enzyme(NAD-ME) was higher.Meanwhile, H. scoparium utilized adaptive structural features, including a larger relative vessel area and a shorter distance from vein to stomata, which facilitated the movement of water. These findings implied that some C4 biochemical pathways were present in H. scoparium to respond to environmental challenges. | Chunmei Gong Jiajia Wang Congxia Hu Junhui Wang Pengbo Ning Juan Bai | 2015 | Journal of Environmental Sciences2015，27，8： | 2 |
| 3 | Baeyer-Villiger Oxidation of Cyclic Ketones Catalyzed by Amino Acid Ionic Liquids显示文摘A series of amino-acid-based ionic liquids was synthesized via one-step protonation of the corresponding L-amiiio acid by utilizing an array of proton sources.The catalytic activity of the amino-acid-based ionic liquids for the Baeyer-Villiger oxidation of cyclic ketones was investigated using cyclopentanone as a model cycloketone.Theproline-based ionic liquid[ProH]CF3SO3 was shown to exliibit thebest catalytic activity.The reaction condition was optimized to give the following reagent ratio of h(cyclopentanone):n(catalyst):w(H2O2)=1:0.06:4,60℃and 6 h.Under the optimum conditions,the conversion of cyclopentanone was 96.57%and the selectivity forδ-valerolactone was 73.01%.The catalytic activity was shown to be constant after 4 cycles.A simple treatment was allowed for the recover and the reuse of[ProH]CF3S03.The successful utilization of[ProH]CF3SO3 to catalyze a host of cyclic ketones via Baeyer-Villiger oxidation clearly demonstrated the capacity of[ProH]CF3S03 to tolerate variation in the substrate. | YU Fengli CHI Yujie GAO Chong CHEN Ruirui XIE Congxia YU Shitao | 2020 | Chemical Research in Chinese Universities2020，36，5： | 1 |
| 4 | Synthesis of plasti- cizer ester using acid-functionalized ionic liquid as catalyst 显示文摘 | Xie Congxia Li Hongliang Li Lu | 2008 | Journal of Hazardous Materials2008，152，： | 1 |
| 5 | Wiener filtering and LMS algorithm of periodicnonuniformly sampled stochastic sequence显示文摘 | Fan Laiyao Zhang Congxia and Ji Hongbing | 1995 | Electronics Letters1995，31，17： | 1 |
| 6 | Wiener Filtering and LMS Algorithm of Periodicnonuniformly Sampled Stochastic Sequence显示文摘 | Fan Laiyao Zhang Congxia Ji Hongbing | 1995 | Electronics Letters IEE1995，31，20： | 1 |
| 7 | Synthesis and property of imidazolium oxidative-thermoregulated ionic liquids显示文摘A series of novel imidazolium oxidative-thermoregulated bifunctional ionic liquids(ILs) have been synthesized by introducing the thermoregulated structural unit into imidazolium cation and using heteropolyanion as the anion of ILs. The structures of these new type of taskspecific ionic liquids(TSILs) are characterized by FT-IR and1 H NMR. The thermostability of ILs is analyzed by thermogravimetry. The thermoregulated properties of ILs in aqueous and organic solvents are mainly investigated.These ILs have the corresponding cloud points(CPs) in aqueous. The effects of IL concentration, polymerization degree, inorganic additives and organic additives on the CP are studied. IL/DMF/n-heptane or n-octane biphasic system has the corresponding critical solution temperature(CST),and has the feature of ‘‘homogeneous at high temperature,heterogeneous at low temperature''. The effects of IL dosage and polymerization degree on the CST are given.IL/DMF/n-octane thermoregulated biphasic system has been successfully applied for catalytic oxidative desulfurization of model fuels. This study opens up a new way for catalytic oxidation to achieve an integration of homogeneous catalysis and heterogeneous separation. | Fengli Yu Chunyu Liu Congxia Xie Bing Yuan Tongan Bu Shitao Yu | 2014 | Chinese Science Bulletin2014，59，34： | 1 |
| 8 | Research on the microclimate characteristics and clod island effect over a reservoir in the HEXI region显示文摘 | Hu Yinqiao Su Congxia Zhang Yongfeng | 1988 | Advan Atmos Sci1988，5，： | 1 |
| 9 | Esterification of α pinane and acetic acid using acidic ionic liquids as catalysts显示文摘 | Liu Shiwei Xie Congxia Yu Shitao | 2008 | Catalysis Conmumiations2008，9，7： | 1 |
| 10 | Dimerization of rosin using BrCnsted-Lewis acidic ionic liquid as catalyst 显示文摘 | Liu Shiwei Xie Congxia Yu Shitao | 2008 | Catalysis Communication2008，9，10： | 1 |
| 11 | Preparation of basic mesoporous molecular sieves K 2 O/Mg-MCM-41 and its catalytic performance on the cracking of soybean oils显示文摘 | Lu Li Kejing Quan Junming Xu Fusheng Liu Shiwei Liu Shitao Yu Congxia Xie Xiaoping Ge | 2014 | Journal of Analytical and Applied Pyrolysis2014，，： | 1 |
| 12 | Synthesis of plasticizer ester using acid-functionalized ionic liquid as catalyst显示文摘 | XIE Congxia LI Hongliang LI Lu | 2008 | Hazard Mater2008，151，23： | 1 |
| 13 | Study on catalytic pyrolysis of polystyrene over base modified silicon mesoporous molecular sieve显示文摘 | Xie Congxia Liu Fusheng Yu Shitao | 2008 | Catalysis Communications2008，9，： | 1 |
| 14 | Dimerization of rosin using Brnsted-Lewis acidic ionic liquid as catalyst显示文摘 | LIU Shiwei XIE Congxia YU Shitao | 2008 | Catalysis Communications2008，9，10： | 1 |
| 15 | Mild and Highly Selective Preparation of Alkylate Gasoline Promoted by Using Polyetheramine-Based Acidic Ionic Liquid显示文摘A polyetheramine(PEA)-based Br?nsted-acidic ionic liquid(IL)was firstly prepared and used to promote the alkylation of isobutane with isobutene catalyzed by trifluoromethanesulfonic acid(TfOH).PEA-IL not only can resolve the persistent problem of poor solubility of the volatile and refractory reactants,but also can satisfactorily exhibit the separation of the catalyst from product oil for reuse.The PEA-IL/TfOH catalytic system with an adjustable acidity ensures a high alkylate selectivity.Under the conditions covering a VIL/VTfOH ratio of 10:3,a temperature of 25°C,and a reaction time of 25 min,the C8-product selectivity reaches 86.63%.The PEA-IL/TfOH catalyst can be reused 13 times without a decrease in the catalytic performance.After many operating cycles,the hydrophobic PEA-IL can be easily regenerated by simply adding water.This study provides a green,economic,and highly efficient method for producing high-octane alkylate gasoline. | Gao Xu Yu Fengli Wang Zhiping Xie Congxia | 2020 | China Petroleum Processing & Petrochemical Technology2020，22，2： | 0 |
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