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在283.15-333.15 K温度范围内, 测量了质子型离子液体N,N-二甲基乙醇胺丙酸盐(DMEOAP)的密度、粘度及电导率. 讨论了温度对密度、粘度和电导率等物理化学参数的影响. 通过经验和半经验方程得到了该离子液体的热膨胀系数、分子体积、标准摩尔熵及晶格能等热力学性质参数. 由电导率和密度计算出了该离子液体的摩尔电导率. 利用Vogel-Fulcher-Tamman (VFT)方程, 将测量的动力粘度和电导率对温度拟合, 得到了动力粘度和电导率随温度变化方程式.并通过Walden规则, 建立了粘度与摩尔电导率之间的联系. 相似文献
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Pd-containing ionic liquid(IL) 1-hexyl-3-methylimidazolium tetrafluoroborate(C6MIMBF4) immobilized on 7-Al2O3(Pd-IL/γ-Al2O3) was prepared and characterized by Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM) and Brunauer-Emmett-Teller (BET) analysis.The influences of C6MIMBF4 loading and Pd on methane conversion to C2 hydrocarbons under cold plasma were investigated.FTIR and SEM analyses indicated that C6MIMBF4 had been successfully immobilized on 7-Al2O3 and the C6MIMBF4 showed excellent stability under cold plasma.The results of BET and methane conversion showed that with the increase in immobilization amount of C6MIMBF4 ontoγ-Al2O3,the specific surface area and pore volume of IL/γ-Al2O3 decreased,while the selectivity and yield of C2 hydrocarbons increased.The selectivity of C2 hydrocarbons was 94.6%when the loading of C6MIMBF4 was 40%,and the percentage of C2H4 in C2 hydrocarbons was as high as 64%when using Pd-IL/γ-Al2O3 as a catalyst with no conventional thermal reduction treatment. Optical emission spectra(OES) from the cold plasma reactor during methane conversion were also studied.The results indicated that the intensity of the C2,CH,H,and C active species from methane and hydrogen decomposition increased when IL/γ-Al2O3 or Pd-IL/γ-Al2O3 was introduced into the plasma system.Based on the analyses of the gas product and OES spectra,it can be concluded that the surface catalyzed reactions between plasma and ionic liquid were very important for the reduction of Pd2+ and the formation of C2H4. 相似文献
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TiO2 decorated with partially crystallized Pd nanoparticles (Pd/TiO2-P) was successfully prepared by atmospheric-pressure dielectric barrier discharge cold plasma. The XRD and XPS analyses proved that Pd ions were reduced to partially crystallized metallic Pd nanoparticles in Pd/TiO2-P. The XPS spectra also indicated that an enhanced metal-support interaction was formed due to the existence of partially crystallized Pd nanoparticles with lower coordination number in Pd/TiO2-P. Photocatalytic activity of Pd/TiO2-P was much higher than that of TiO2 samples decorated with well crystallized Pd nanoparticles. 相似文献
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以四氯化钛、三价铁盐和二价钴盐为前驱体,采用超声波技术一步合成了TiO2-CoFe2O4新型复合光催化剂,运用VSM、XRD、TEM和UV-Vis技术进行了表征,以甲基橙为模拟污染物在太阳光照射下研究其光催化活性。结果表明:所制得的样品具有良好的顺磁性,其饱和磁化强度为212 Gs;样品中TiO2和CoFe2O4分别以锐钛矿相和尖晶石结构存在,粒径尺寸在40~50 nm之间;样品在紫外-可见区有很强的吸收。光催化结果表明复合催化剂具有较高的太阳光催化活性,循环使用3次,仍能保持良好的催化活性。 相似文献
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<正>Projective synchronization of a weighted complex network is studied in which nodes are spatiotemporal chaos systems and all nodes are coupled not with the nonlinear terms of the system but through a weighted connection.The range of the linear coefficient matrix of separated configuration,when the synchronization is implemented,is determined according to Lyapunov stability theory.It is found that projective synchronization can be realized for unidirectional star-connection even if the coupling strength between the nodes is a given arbitrary weight value.The Gray-Scott models having spatiotemporal chaos behaviours are taken as nodes in the weighted complex network,and simulation results of spatiotemporal synchronization show the effectiveness of the method. 相似文献