高表面电荷密度单分散苯乙烯磺酸钠纳米微球的制备

利用无皂乳液聚合 ,在苯乙烯 (St)的反应体系中引入适量的苯乙烯磺酸钠 (NaSS)参加共聚合 ,在聚合过程中分两阶段加料 ,第一阶段中NaSS浓度是决定乳胶粒粒径及单分散性的关键因素。当反应达到较高转化率 ( >90 % )时加入第二阶段单体混合物 ,此阶段中NaSS与St的比例决定了最终胶粒的表面电荷密度。利用上述两阶段无皂乳液聚合法成功地制备了粒径小于 10 0nm、单分散性指数小于 1.0 5以及表面电荷密度大于 3 0 μC·cm-2 的一系列乳胶粒     

甲烷和空气部分氧化制合成气

使用空气做氧化剂,可减轻甲烷部分氧化制合成气反应中催化剂床层的“热点”问题,而且可大大降低加压反应条件下反应爆炸的危险性,因此易于工业化,对国内外在这一领域的研究总结表明,以空气与甲烷部分氧化制合成气在理论和反应条件上都是可行的,但忖用于空气来转化CH4的抗高温烧结和抗结炭性能好的催化剂有待进一步研究和开发,参考文献10篇。     

带荧光基团蒽的正庚醛和正丁醛ReSOrcinarenes母体衍生物的合成研究

合成正庚醛、正丁醛Resorcinarenes母体,经生成酯衍生物后同－9蒽甲醇反应,合成了带荧炮光基团蒽的正庚醛、正丁醛Resorcinarenes母体衍生物,考察了各种因素对产物产率的影响,并给出了产物的IR,^1H NMR,MS及UV谱数据。     

MCM-49分子筛的合成及其对烷基化反应的催化性能

The MCM 49 zeolite was successfully synthesized using an organic mixture solution (OMS) yielded from hydrogenation of caprolactam as the template instead of the pure hexamethyleneimine (HMI). The OMS contains HMI (76 0%～84 0%), caprolactam (1 0%～10 0%), water, and a few by products. So the synthesis cost of the MCM 49 zeolite decreases obviously. The MCM 49 zeolite synthesized using OMS as the template shows similar crystallinity and purity to that synthesized using pure HMI in conventional process. From the results of NH 3 TPD, N 2 adsorption isotherm, and DTA, it is evident that the MCM 49 zeolite possesses three kinds of acidic centers with different strength, and has a high specific surface area and good thermostability. Furthermore, the MCM 49 zeolite shows good catalytic behavior for the alkylation of benzene with dilute ethylene to ethylbenzene.     

气相色谱法测定太白洋参中的甘露醇含量

介绍了应用气相色谱法－氢火焰离子化检测器检测太白洋参中甘露醇的方法,采用OV－225填充柱分离该法平均回收率为90．66％,检出限为0．1mg/kg。     

混合稀土离子的毛细管电泳电导法分离检测

采用高效毛细管电泳电导检测法分离检测了稀土离子。以醋酸-醋酸钠为背景电解质,4-吗啉乙磺酸（MES）为络合剂,在24kV的高压下,7种稀土离子得到子较好的分离。考察了背景电解质的pH和浓度,络合剂的浓度,分离电压等对稀土离子分离的影响。在选定的实验条件下,7种烯土离子在10min内守成分离检测。     

SnO2—Al2O3复合氧化物催化剂的一氧化氮选择催化还原性能

采用双股并流共沉淀方法制备的锡铝复合氧化物,对有氧条件C3H6选择还原NO反应有较高的催化活性和较宽的反应温度区间。具有最佳配比（Sn:Al(摩尔比）＝1：1.94）的锡铝复合氧化物样品,在反应温度350℃时可使NO转化率达71％,XRD、H2－TPR及NH3－TPD的研究结果表明,锡与铝难以形成氧化物固溶体, 而SnO2是以微晶形态分散于无定形的Al2O3上,Al2O3的中等强度酸性与SnO2微晶适度的氧化还原性能相结合,使锡铝复合氧化物具有较高的催化活性。     

（ZnBaLa）BO3：Eu^3＋的合成与发光的研究

高温固相扩散法合成了发光材料Zn1．5xBa1．5yLa1-x-y-z)BO3∶Eu3+z(x+y+z＜0．4)．对样品进行了XRD和IR分析,结果表明：在空气中900 ℃条件下,合成了荧光体样品,LaBO3中La3+离子被部分Zn2+和Ba2+离子取代使晶系发生了变化,LaBO3属于正交晶系,而(Zn0．27Ba0．24La0．61)BO3∶Eu3+0．05经过XRD属于立方晶系,a=0.639 7,V=0.261 8 nm3．扫描电镜测其晶貌,平均粒度为22 μm左右．样品的激发光谱和发射光谱显示：在基质BO3结构中O2—Eu3+的CT带位于295 nm,Eu3+的强发射来自5D0→7F1和5D0→7F2跃迁,存在磁偶极和电偶极两种跃迁．     

A New Perylenequinone from Hypomyces sp.

Some metabolites of fungi and plants containing perylenequinones have been used as folk medicine for the treatment of many diseases1,2. A filamentous fungus, Ascomy-cetes Hypocreaceae Hypomyces (Fr.) Tul. sp., was found from the northwestern mountains of Yunnan Province, and cultured successfully in the laboratory. A new perylenequinone, named hypomycin A (1), was isolated from its mycelia. In this paper the structure elucidation of 1 was described. Figure 1 The structure of compound 1 Fig…     

Synthesis of (s)-(-)-Benzyl-2-tert-butoxycarbonyl amino-4-iodobutyrate

The proteinogenic (-amino acids constitute an important section of the "chiral pool", being inexpensive in the L-form (but available if necessary as the D enantiomers), structurally varied and chemically versatile1, they are useful starting materials for chiral reagents, auxiliaries and ligands2. Any high-yielding transformation of an (-amino acids which proceeds without racemization is thus of potential importance, especially if it generates another reactive center and may be applied to the s…