Fe—Cu—K催化剂上费托合成反应的研究

通过一系列实验,研究了固定床中工业ＦｅＣｕＫ催化剂上费托合成反应的规律。结果表明,反应温度、压力、原料气Ｈ２／ＣＯ等操作条件影响费托反应转化率、产物分布和产物的收率。随着操作温度（５０３～５４３Ｋ）的升高,ＸＣＯ＋Ｈ２、Ｃ１＋、Ｃ５＋均有明显的增加,碳氢化合物向轻组分方向偏移,产物中烯／烷比呈有规律的变化;随着压力的升高（１．０～３．０ＭＰａ）,ＸＣＯ＋Ｈ２、Ｃ１＋、Ｃ２＋、Ｃ５增大,轻油（Ｃ２～Ｃ４）的组分含量也有增加趋势,但压力对烯烃、烷烃的选择性影响不同,压力增大产物中烯／烷比下降,有利于烷烃的生成;原料气Ｈ２／ＣＯ比亦较大程度地改变了ＦｅＣｕＫ催化剂上的产物分布和收率,原料气Ｈ２／ＣＯ比（１．０２～２．８３）升高可增大ＸＣＯ,产物中低碳烃含量上升,但Ｃ１＋和Ｃ５＋收率减少。本文还对铁基费托合成催化剂上伴随的水煤气变换反应的变化规律进行了探讨。     

160例学龄前,学龄儿童发铅含量测定

采用日本岛津AA-670型全自动原子吸收分光光度计、Air／C2H2标准曲线法测定学龄前儿童（2-6岁）100例,学龄儿童（7-11岁）60例头发中铅的含量.结果表明,学龄前儿童发铅含量为11.05×10-6±5.06×10-6.学龄后儿童发铅含量为7.53×10-6±4.28×10-6.经t检验：P＜0.01,两者具有高显著性差异.     

胆囊结石患者手术前后血清SOD、LPO的变化

为研究胆囊结石患者血清中超氧化物岐化酶活性水平,过氧化脂质含量及其变化簧 嘌呤氧化酶法和硫代巴比妥酸法测定了４８例胆囊结石患者手术前后血清中ＳＯＤ活性和ＬＰＯ含量。     

Comparable charge transport property based on S…S interactions with that of π-π stacking in a bis-fused tetrathiafulvalene compound

Compact molecular packing with short π-π stacking and large π-overlap in organic semiconductors is desirable for efficient charge transport and high carrier mobility.Thus charge transport anisotropy along different directions is commonly observed in organic semiconductors.Interestingly,in this article,we found that comparable charge transport property were achieved based on the single crystals of a bis-fused tetrathiafulvalene derivative(EM-TTP) compound along two interaction directions,that is,the multiple strong S…S intermolecular interactions and the π-π stacking direction,with the measured electrical conductivity and hole mobility of 0.4 S cm~(-1),0.94 cm~2 V~(-1) s~(-1) and 0.2 S cm~(-1),0.65 cm2 V~(-1) s~(-1),respectively.This finding provides us a new molecular design concept for developing novel organic semiconductors with isotropic charge transport property through the synergistic effect of multiple intermolecular interactions(such as S…S interactions) and π-π stacking.     

High Carbon-Resistance Ni@CeO<Subscript>2</Subscript> Core–Shell Catalysts for Dry Reforming of Methane

Ni@CeO₂ core–shell catalysts were synthesized via a facile surfactant-assisted hydrothermal method and their catalytic performance in the dry reforming of methane (DRM) reaction was evaluated. A variety of techniques including XRD, N₂ adsorption–desorption, SEM, TEM, TPO, TGA were employed to characterize the prepared or spent catalysts. The encapsulation by the CeO₂ shell, on one side, can restrict the sintering and growth of Ni nanoparticles under harsh reaction conditions. On the other side, compared to the conventional shell material of SiO₂, CeO₂ can provide more lattice oxygens and vacancies, which is helpful to suppress coke deposition. Consequently, the Ni@CeO₂ core–shell catalysts exhibited better catalytic activity and stability in the DRM reaction with respect to the referenced Ni@SiO₂ core–shell catalysts and Ni/CeO₂ supported catalysts.     

基于苯乙烯和苯并噻二唑共聚场效应发光高分子材料的设计合成及性能研究

共轭高分子材料由于其优异的光电性能和可溶液加工等特性在有机光电器件中具有重要应用.本工作采用Stille偶联和Suzuki聚合反应,合成了两个由经典发光基元苯乙烯片段和共轭吸电子结构基元苯并噻二唑共聚的高分子材料聚(1,2-双(2,5-双(异辛氧基)亚苯基亚乙烯基-2,1,3-苯并噻二唑))(PVBT)和聚(1,2-双(2,5-双(正辛氧基)亚苯基亚乙烯基-2,1,3-苯并噻二唑))(nPVBT).通过凝胶渗透色谱(GPC)、元素分析及差式扫描量热法(DSC)对PVBT和n PVBT两种高分子材料的结构及热稳定性进行表征,结果表明它们均具有良好的热稳定性,分解温度约380℃.由于烷氧基链的存在,两个材料具有良好的溶解性及成膜加工性.PVBT和n PVBT均表现出优异的发光特性,最大发射波长在590～605nm范围,溶液下荧光量子产率为23%～35%,固态薄膜下量子产率为12%～20%.以这两个高分子材料薄膜作为活性层,所制备的顶栅-底接触型有机场效应晶体管器件显示出典型的p型电荷传输性能,空穴迁移率可达1.1×10^-4cm²·V^-1...