SnO2-Nb2O5/MgAl2O4/α-Al2O3催化环氧乙烷水合制乙二醇

采用水热稳定的MgAl2O4尖晶石对-αAl2O3载体表面进行修饰,采用具有较强亲水性能的SnO2对活性组分Nb2O5进行修饰,制备了SnO2-Nb2O5/MgAl2O4/-αAl2O3催化剂,并用于环氧乙烷水合制乙二醇反应.采用X射线衍射、红外光谱和程序升温脱附研究了Sn/Nb摩尔比对催化剂酸性、环氧乙烷在催化剂表面的吸附状态和吸附强度以及催化剂性能的影响.结果表明,Sn/Nb摩尔比明显影响催化剂的组成和结构;催化剂的结构不同,环氧乙烷在催化剂表面的吸附强度存在明显差别,催化剂的催化性能明显不同.     

双功能催化剂体系作用下乙烯二聚和共聚合的研究

用乙烯为原料在双功能催化剂体系的作用下通过二聚和共聚合反应，直接合成线性低密度聚乙烯（ＬＬＤＰＥ）．所用二聚反应催化剂为钛酸正丁酯（Ｔｉ（ＯＢｕ）_４），共聚催化剂为ＴｉＣｌ_４／ＭｇＣｌ_２（ＺＭ－１催化剂）．研究了二聚反应动力学行为及影响双功能催化剂体系动力学过程的一些因素．结果表明利用这两种催化剂组成双功能催化剂体系能够很方便地制得密度范围在０．９０－０．９３，Ｅｔ／１０００Ｃ在１０－４０的ＬＬＤＰＥ．     

胶束溶液中高氯酸二水(四胺)合钴(Ⅲ)配合物催化磷酸二酯水解的研究

本文合成了疏水性高氯酸二水（四胺）合钴（Ⅲ）配合物，研究了它与非离子表面活性剂Brij35形成的金属2胶束催化二（对硝基苯酚）磷酸二酯水解的动力学及其机理。结果表明此金属胶束对磷酸二酯水解的速率大约提高10^4倍，这主要是由于表面活性剂胶束的pH效应和浓聚效应所致，暗示着顺式二水类配合物形成的金属胶束是一个潜在的磷酸二酯水解剪切的催化剂。     

CuO/Al2O3催化剂高温固相反应的原位XRD和Raman研究

采用原位XRD和激光Raman光谱等技术对CuO/Al2O3系列催化剂高温下的表面组成和体相结构的变化进行研究.结果表明,随着焙烧温度升高,CuO首先与载体Al2O3发生固相反应生成CuAl2O4.CuAl2O4层能阻止外层CuO进一步向载体Al2O3扩散,从而使部分CuO稳定在CuO/Al2O3催化剂的表层.     

Circularly Polarized Absorption Property of Tetra-4[4''''-(2-methylbutoxy)benzoyloxy]phenyl Porphyrin by Introducing Optical Pendant Groups

Circularly polarized luminescent(CPL) materials possess special dissymmetric optical property, i.e. luminescent light having different intensities for left (L) and right(R) circularly polarized components. Recently, these materials have been applied in colour-image projection, stereoscopic displays and light-emitting diodes(LEDS)1-7. We have synthesized a new porphyrin derivative, tetra-4[4'-(2-methylbutoxy)benzoyloxy] phenyl porphyrin [T(MBBP)P], by introducing a chiral group, which p…     

气相色谱法测定饮料中乙醇含量

采用样品用注射器吸附后直接经C18柱后进样，用气相色谱法测定，该方法适合多样饮料中的乙醇测定，平均回收率为98．6％，检出限为7．7mg/L。     

SYNTHESIS AND CATALYTIC PROPERTY OF POLYSTYRENE SUPPORTED GLUTAMIC ACID SCHIFF BASE COMPLEX OF Mn（ Ⅱ ） IN AEROBIC OXIDATION OF CYCLOHEXENE

The polystyrene supported glutamic acid Schiff base complex of Mn （ Ⅱ ） （PS-Sal-Glue-Mn） was prepared with chloromethylated styrene polymer beads, 2,4-dihydroxybenzaldehyde, L-glutamic acid and manganese （ Ⅱ ） acetate tetrahyrate. The polymeric ligand and the complex were characterized by FT-IR, small area X-ray photoelectron spectroscopy （XPS） and 1CP-AES. In the presence of the manganese complex, cyclohexene （1） was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2-cyclohexen-l-ol （2）, 2-cyclohexen-l-one （3） and 2-cyclohexen-1- hydroperoxide （4）, which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-1-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.     

New Criteria for Polynomial Stability

New criteria for real-polynomial stability, developed during1957–1978, are introduced. The real polynomial an is called stable if every one of its roots hasnegative real part. We define determining coefficients for the positive-coefficient polynomial f(x). Thestability of f(x) is completely determined by the n –2 determining coefficients. Several simple necessary or sufficientconditions for a stable polynomial are presented in terms ofinequalities involving the determining coefficients. For example,a necessary condition is , and a sufficientcondition is .     

新型(E)-1-取代苯基-3-(3''''-取代吲哚基)-2-丙烯酮类化合物的合成和抗炎活性研究

设计合成了一系列新的席合物3a～3p, 其结构经 1H NMR, IR, LC/MS确证. 用化合物对小鼠耳部巴豆油炎症影响的炎症模型测定化合物3a～3i的生物活性, 结果表明, 化合物3d, 3f, 3g可明显抑制巴豆油致小鼠耳部炎症. 其抑制率分别为19.5%, 27.6%, 16.1%.     

Pt/Al2O3蜂窝状催化剂上NO选择性催化还原反应动力学研究

采用多次涂层和浸渍法制备了蜂窝状Pt/Al2O3催化剂，并在高空速和大气体流量条件下对无梯度循环式反应器和积分反应器上催化剂的活性进行了比较。同时采用循环式反应器对动力学数据进行了测定。根据Langmuir-Hinshelwood模型和实验结果，推测了NO-C3H6-O2体系的SCR反应机理，并导出了NO和C3H6反应速率的数学表达式。据此所计算的理论模拟值能够与实验值很好地吻合。实验结果表明，氧气浓度对NO和C3H6的反应速率有明显的影响，二者均随着氧浓度c (O2)的增加达到峰值，再增加氧气浓度时，C3H6的反应速率r(C3H6)保持不变，而NO反应速率r (NO)却下降，而且下降的程度随着温度的升高而加剧。同时，随着氧气浓度增加，r (NO)达到最大值时的温度亦随之下降。