Solvent-free selective hydrogenation of o-chloronitrobenzene to o-chloroaniline over alumina supported Pt nanoparticles

A supported Pt/Al2O3 catalyst was prepared by immobilizing preformed colloidal Pt nanoparticles on Al2O3. The particle size and size distribution of Pt particles on Al2O3 remained the same as the colloidal nanoparticles. Selective hydrogenation of o-chloronitrobenzene to ochloroaniline was performed on the as-prepared Pt/Al2O3 nanocatalyst without using any solvent and 88.5% selectivity to o-chloroaniline at 98.2% conversion of o-chloronitrobenzene was achieved. Further catalytic experiments with metal cation modification showed that some metal cations could improve the activity in various degrees while maintaining the high selectivity. Especially, 99.8% selectivity to o-chloroaniline at ~100% conversion was attained with Sn4t.     

聚合物酸的疏水性对催化缩酮化反应的影响

通过测定因载了不同量的氯化氢的聚（对氨基苯乙烯）和不同交换量的强酸性阳离子交换树脂催化的环己酮与乙二醇的缩酮化反应缩酮的收率，研究了聚合物固体酸催化剂的疏水性对其催化缩酮化反应性能的影响；发现在一定范围内增加催化剂的疏水性，可提高缩酮化反应的收率。     

白庙子斜发沸石水热离子交换性能研究

研究了白庙子斜发沸石在水热离子交换中阳离子交换容量、配位阳离子交换度及K 、N a 、C a2 离子在该矿样上的交换量.实验发现,该矿铵离子交换容量为1.73 mm o l/g,配位阳离子交换度C a2 >K >M g2 >N a .在铵改性矿样NH4Z上K 离子属超容量交换,交换量达78.2 m g/g,对海水提钾有应用价值.在不同离子交换矿样上C a2 交换量NH4Z>N aZ>KZ>O rZ,在钠改性矿样N aZ上C a2 离子交换量可达32.4 m g/g,对硬水软化有应用价值.     

非晶态MoS_3制备方法的改进与其电化学特性的研究

本文报导了用改进的水溶液酸化沉淀法制备非晶态三硫化钼。并对该材料的导电特性、用作锂电池阴极材料的放电特性以及循环伏安特性进行了研究。     

Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode

To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials(LiNi0.8Co0.15Al0.05O2,NCA),lithium lanthanum titanate(LLTO)nanofiber and carbon-coated LLTO fiber(LLTO@C)materials were introduced to polyvinylidene difluoride in a cathode.The enhancement of the conductivity was indicated by the suppressed impedance and polarization.At 1 and 5 C,the cathodes with coupling conductive paths had a more stable cycling performance.The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C.In the pristine cathode,the propagation of lattice damaged regions,which consist of high-density edge-dislocation walls,destroyed the bulk integrity of NCA.In addition,the formation of a rock-salt phase on the surface of NCA caused a capacity loss.In contrast,in the LLTO@C modified cathode,although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred,they were limited to a scale of several atoms,which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity retention.Only NiO phase“pitting”occurred.A mechanism based on the synergistic transport of Li ions and electrons was proposed.     

Insulin-like effect of dichloroacetic acid on hexose transport in Swiss 3T3 cells

Summary Hexose transport in Swiss 3T3 cells was increased by treatment with dichloroacetic acid as well as by treatment with insulin. Neither extra-nor intracellular Ca²⁺ was found to be involved in their stimulatory action. On the other hand, the removal of intracellular Mg²⁺ resulted in a loss of the stimulation. These results suggest that dichloroacetic acid stimulates the hexose transport in Mg²⁺-dependent manner, similar to that of insulin.This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Science and Culture, and the Ministry of Health and Welfare of Japan.     

马来酸酐双酯型阳离子可聚合表面活性剂的合成研究

合成了马来酸酐双酯型阳离子可聚合表面活性剂,采用马来酸酐与十二醇开环生成十二烷基马来酸酐半酯;用2-(二乙氨基)氯乙烷盐酸盐在弱碱性(KHCO3)条件下与十二烷基马来酸酐半酯烷基化而生成亮黄色油状的长链叔胺;然后用溴化苄与十二烷基叔胺季胺化而生成马来酸酐双酯型阳离子可聚合表面活性剂,研究结果表明:当十二烷基叔胺与溴化苄反应摩尔比为1:1.2,反应温度为60℃,于丁酮中反应2,4 h,表面活性单体产率最高可达68.65％,红外光谱和核磁共振氢谱证实了所合成表面活性剂的结构,该产品能显著降低水的表面张力(28.21 mN·m-1),并具有较低的临界胶束浓度(0.0167 mmol·L-1).     

三江平原碟形洼地-岛状林土壤阳离子交换量分布特征

通过野外调查采样和室内测定分析,研究了三江平原碟形洼地-岛状林土壤阳离子交换量(cation exchange capacity,CEC)分布特征及其与水文地貌、土壤养分和群落特征的关系.结果 表明,三江平原碟形洼地-岛状林土壤CEC为9.83～37.97 cmol/kg;碟形洼地-岛状林方向上,0～40 cm深度土壤CEC平均值先增大后减小而后稍有增大,呈"N"字形,毛薹草群落区土壤阳离子交换量最大(26.82 cmol/kg),乌拉薹草群落区最小(23.26 cmol/kg);垂直方向上,随着土层深度增加,土壤CEC逐渐减少,基本处于低度和中度变异.土壤CEC分布主要受土壤有机质的积累状况影响,土壤全磷全氮含量与土壤CEC含量呈极显著的正相关,土壤钾含量与土壤CEC呈极显著的负相关.     

Mechanical properties of carbonfi ber/cellulose composite papers modified by hot-melting fibers

Carbon fiber(CF)/cellulose(CLS) composite papers were prepared by papermaking techniques and hot-melting fibers were used for modification. The mechanical properties of the obtained composite papers with different CF,CLS and hot-melting fiber ratios were studied and further discussed. It is observed that,for both CF/CLS composite papers and those modified by hot-melting fibers,the normal stress firstly increases and then declines with the addition of carbon fibers. The results also show that with the addition of hot-melting fibers,the modified papers exhibit enhanced mechanical performance compared to CF/CLS composite papers. Through SEM characterization,it is confirmed that the improvement of mechanical properties attributes to the reinforcement of adhesive binding at the fiber overlap nodes. Also,through four-probe method,the resistivity and the electrical performance of the modified and unmodified papers were characterized and the result shows that the hot-melting fiber modification brings no harm to the electrical properties.     

Effects of baria on propane oxidation activity of Pd/Al2O3 catalyst: Pd–BaO interactio n and reaction routes

The BaO-modified Pd/Al2O3exhibits much better catalytic activity than Pd/Al2O3for C3H8 oxidation both before and after the hydrothermal aging treatment. Further studies ascribe its good activity to the influence of BaO species on the physicochemical characteristics of the catalyst and the reaction routes. Firstly, the BaO species inhibits the phase transformation of alumina, resulting in higher surface area of the catalysts and hereby a better dispersion of Pd. Secondly, the basic nature and electron-withdrawing effect of barium oxide maintain palladium at high oxidation state, which leads to a higher PdO content on surface of the BaO-modified catalyst. Finally, the formation/decomposition of carbonate/bicarbonate species can be promoted by the addition of BaO, which provide extra reaction routes and are important for the deep oxidation of C3H8.