常温下 MnO2/Al2O3催化剂催化臭氧氧化甲苯反应

采用浸渍法制备了Al2O3负载的5种过渡金属氧化物催化剂,考察了它们在常温下催化臭氧氧化甲苯的性能,并运用程序升温还原、程序升温氧化、N2吸附-脱附和X射线光电子能谱对催化剂进行了表征.结果表明,NiO/Al2O3,CoO/Al2O3和MnO2/Al2O3催化剂上活性氧中心数量较少,臭氧与甲苯转化率较高;而Fe2O3/...     

阳离子表面活性剂存在下水/有机两相体系中双环戊二烯氢甲酰化

研究了在阳离子表面活性剂存在下水/有机两相中水溶性铑配合物RhCI(CO)(TPPTS)2(TPPTS:P(m-C6H4SO3Na)3)催化双环戊二烯氢甲酰化反应,考察了反应温度、催化剂浓度、不同水溶性膦配体TPPTS和TPPDS(C5H5P(m-C6H4SO3Na)2),以及表面活性剂结构对催化反应的影响.结果表明,...     

Synthesis, Crystal Structure, and Biological Activity of Naphthalen-2-y1-4-methyl-1,2,3-thiadiazole-5-carboxylate

The title compound naphthalen-2-y1-4-methy1-1,2,3-thiadiazole-5-carboxylate(C14H10N2O2S,Mr = 270.31)was synthesized by the reaction of 4-methyl-1,2,3-thiadiazole-5-carbonyl chloride with 2-naphthol,and its structure was characterized by IR,1H NMR,high-resolution mass spectrometry and single-crystal X-ray diffraction.The crystal belongs to orthorhombic,space group Pbcn with a = 23.475(5),b = 9.6640(19),c = 10.814(2)(A°),β = 90.00°,Z= 8,V= 2453.2(9)(A°)3,Mr = 270.30,Dc = 1.464 g/cm3,μ= 0.262 mm-1,F(000)= 1120,R = 0.0444 and wR = 0.1099.X-ray analysis revealed that the thiadiazole and naphthalene rings were non-planar,while,the thiadiazole ring and the ester group were essentially planar,and two intermolecular hydrogen bonds C(6)-H(6)…O(1)and C(14)-H(14)…O(1)were observed.The preliminary biological test showed that the title compound had antifungal and antivirus activities against tobacco mosaic virus.     

元素掺杂对VH2解氢性能的影响

采用密度泛函理论（DFT）的第一性原理的平面波超软赝势方法,研究了Zr、Cu、Zn掺杂对VH2的电子结构和解氢性能的影响．计算结果显示Zr掺杂VH2后晶体模型的负合金形成热增加和费米能级目处电子浓度N（Ef）的减少,体系结构稳定性增强;V—H之间重叠集居数和电子密度计算也显示V-H之间相互作用增强;表明在VH2中掺杂Zr以后吸放氢最大容量增加,但解氢能力减弱．而Cu或Zn掺杂VH2以后晶体模型的负合金形成热减少和费米能级Ef处电子浓度N（Ef）增加,体系结构稳定性减弱;V-H之间重叠集居数和电子密度计算也显示V-H之间相互作用减弱;表明在VH2中掺杂Cu或Zn以后吸放氢最大容量降低,但解氢能力增强．与实验结论相符．同时Mulliken集居数计算结果还显示V-d轨道MuUiken集居数与掺杂有关,掺杂Zr以后V—d轨道Mulliken集居数减少;掺杂Cu或Zn以后V—d轨道Mulliken集居数增加．     

CO_2-甲醇和CO_2-乙醇体系的界面性质

在交叉缔合的均相状态方程的基础上,结合密度梯度理论(density gradient theory,DGT),建立了适用于CO2-甲醇和CO2-乙醇二元体系界面性质研究的状态方程,对CO2-乙醇体系表面张力的关联结果与实验值吻合良好.阐明了CO2分子与甲醇分子和乙醇分子之间的交叉缔合作用对二元体系表面张力计算结果的影响,以及界面相中CO2与醇羟基之间的交叉缔合与温度和压力之间的关系.     

飞行时间质谱仪四极杆射频信号放大器的研制

根据自制质谱仪需求研制了一种射频放大装置,由放大电路模块和耦合线圈构成,将其与射频信号发生装置结合用以驱动射频四极杆.该射频放大器可将射频信号放大30倍,为自制射频四极杆提供共振频率1.4 MHz,射频电压峰峰值电压Vp-p可调范围0～600 V的射频信号.自制四极杆用于传输大气压下离子源产生的离子从离子源至工作在高真...     

反应性马来酸十二酯在苯丙乳液制备中的应用

马来酸酐与月桂醇反应合成了马来酸十二酯(1),以1为反应型乳化剂制备了苯丙乳液(2和2′).对2和2′的结构与性能进行了初步研究,探讨了聚合工艺、反应时间、单体转化率、温度等对2′性能的影响.制备2′的最佳反应条件为:w(1)=2.5%,用水量50%-60%,采用预乳化法,于75℃～80℃反应6 h,单体转化率96.2...     

Effects of Co-addition of DBS and PEG on Wetting Performance of TiO_2 Film

Nanocrystalline anatase TiO2 films with indium tin oxide(ITO) coated glass as the film substrate were fabricated through spin-coating technique. The TiO2 pastes were prepared with sodium dodecylbenzenesulfonate(DBS) modified TiO2 nanocrystals, synthesized by sol-hydrothermal processes in advance, together with different amounts of polyethylene glycol(PEG) macromolecules. The as-prepared films were mainly characterized by ultraviolet-visible (UV-Vis) spectroscopy, field emission scanning electron microscopy(...     

阿维菌素在柑桔和土壤中的消解动态研究

利用高效液相色谱法,建立了阿维菌素在柑桔和土壤中的残留分析方法.研究了阿维菌素在柑桔和土壤中的残留消解动态,对影响残留分析方法的主要参数进行了优化.柑桔和土壤样品分别用乙腈和二氯甲烷提取,弗罗里硅土柱净化,高效液相色谱仪可变波长紫外检测器检测,外标法定量.结果表明,该方法在柑桔和土壤中的最低检测浓度均为0.01 mg/...     

Crossed Ladders in a 2-D Mixed-ligand Lanthanide Coordination Polymer:Synthesis,Crystal Structure and Photoluminescence

A new metal-organic coordination polymer,[Ce(L 1)(L 2)(H 2 O)]·2H 2 O (1,H 2 L 1=2,6-dimethylpyridine-3,5-dicarboxylic acid,H 2 L 2=(E)-2,6-dimethyl-4-styrylpyridine-3,5-dicer-boxylic acid),has been synthesized and characterized by elemental analysis,IR,and X-ray single-crystal diffraction.Compound 1 crystallizes in triclinic,space group P1 and displays a two-dimensional coordination network structure.In 1,the relatively rare crossed ladders cons-tructed by mixed ligands organize a 2-D grid with the topology of (4 2 6) 2 (4 8 6 6 8),and the layers further build up a 3-D supramolecular architecture via interlaminar hydrogen bonds.