STUDIES OF MULTICOMPONENT COMPLEX OXIDE CATALYSTS FOR OXIDATIVE COUPLING OF METHANE VI.SURFACE BASICITY AND SURFACE ACTIVE OXYGEN SPECIES OF LiTi_xLa_(1-x)O_2 λ MULTICOMPONENT OXIDE CATALYSTS

The surface basicity of Ti-La-Li multicoinponent oxides has been investigated by means of CO2-TPD. The experiment results show that C2 (C2H6 C2H4) selectivity is related to surface basic strength. The surface active oxygen species have also been characterized by means of XPS, O2-TPD and so on. It has been indicated that C2 selectivity and CH4 conversion are correlated with lattice oxygen and the adsorbed oxygen on the surface of the catalyst respectively In the O2-TPD experiments, it has also been found that there are three kinds of oxygen species on the surface of the series catalvsts, which are a (100℃ 750℃) Among them α-oxvgen causes deep oxidation whileβand γ oxygen species are related to oxidalive coupling of methane (OCM).     

Plasmid DNA isolation using amino-silica coated magnetic nanoparticles (ASMNPs)

A simple and efficient approach for the rapid isolation of plasmid DNA from crude cell lysates has been described. The approach took advantage of the amino-modified silica coated magnetic nanoparticles (ASMNPs) with positive zeta potential at neutral pH and superparamagnetism under the external magnetic fields. As a demonstration, the pEGFP-N3 plasmid has been concentrated and isolated from the E. coli DH5α transformed with pEGFP-N3 plasmid through electrostatic binding between the positive charge of the amino group of ASMNPs and the negative charge of the phosphate groups of the plasmid DNA. Then the pEGFP-N3 plasmid has been released easily and quickly from the pEGFP-N3 plasmid-ASMNPs complexes with 3 M NaCl. The entire procedure could be carried out by the aid of external magnetic fields in 15 min and eliminate the need of phenol, cesium chloride gradients or other noxious reagents and complexes operation. Moreover, the pEGFP-N3 plasmid obtained by this approach retains biological activity that can be suitable for restriction enzyme digestion and cells transfection with expression of green fluorescence protein.     

一种分离抗凝血酶Ⅲ的高效亲和色谱填料的制备及表征

以聚甲基丙烯酸环氧丙酯微球 ( PGMA)为基质 ,利用还原氨化方法将肝素键合在其表面上 ,得到一种以肝素为配基的高效亲和色谱填料 ,该填料对抗凝血酶 的亲和容量为 1 .2 mg/g,对抗凝血酶 和人血清白蛋白的回收率分别为 96.9%和 94 .4 % .利用前沿色谱法测定了肝素与抗凝血酶 之间的表观解离常数为 1 .96× 1 0 - 5mol/L.利用该填料可直接从人血浆中分离出抗凝血酶     

2，2＇－偶氮二异丁酸二甲酯的合成及其热分解反应的研究

本文研究了２，２＇－偶氮二异丁酸二甲酯的合成及其在甲苯、二甲苯中的热分解反应动力学，得到了其热分解反应速度常数与反应温度的关系式：Ｋ＿ｄ＝１．６３×１００￣（－１４）ｅｘｐ（－１２３．３ＫＪ／ＲＴ）２，２＇－偶氮二异丁酸二甲酯作为苯乙烯自由基聚合的引发剂，其单体转化率随引发剂用量的增加而增高，产物分子量则随之下降；引发剂用量在５％以上时，可得到分子量低于１０￣３的含有酯基端基的聚合物。     

广义簇合物在均匀几率密度场下的生长

通过对广义簇合物生长的自调整模型的解析,得出了粒子在均匀几率密度场下簇合物生长形态的变化特征,揭示了表征其生长形态结构分式维数D的物理意义,同时考查了格子模型对簇合物生长形态的影响以及自调整模型的动力学行为。     

New ceramides from the flower of Albizia iulibrissin

A new ceramide and its glycoside were isolated from the flower of Albizia julibrissin. Their structures were established as (25,35,4R,8E)-2-[(2'R)-hydroxyhexadecanoylamino]-8-tetra-cosene-l,3,4-triol(I)and 1-O-β-D-glucopyranosy1-(2S,3S,4R,8E)-2-[(2'R)-hydroxy-hexade-canoylamino]-8-tetracosene-1,3,4-triol (II) on the basis of chemical and spectroscopic studies.     

废聚丙烯塑料等离子体热解研究——水蒸气的加入对改善气体品质的影响

以聚丙烯为试验物料，利用N2热等离子体在等离子体反应器内进行了一系列热解试验，重点考察了气体产物成分及含量。在反应过程中加入过热水蒸气以改善气体品质，在本实验条件下，气体产物中CO与H2之和可以达到40%，C2H2可达到5%。     

Oxidation of Styrene with Molecular Oxygen in Supercritical CO2

The oxidation of styrene with molecular oxygen catalyzed by PdCl2 CuCl2 has been investigated in supercritical CO2 with a batch reactor. The oxidative system of styrene contains four components at the beginning and seven components during the reaction. The critical temperature, critical pressure, and critical density at different conversions are determined by using a high-pressure view cell. The effect of phase behavior on the conversion and selectivity were studied. Experimental results showed that the critical parameters of the reaction mixture at fixed initial molar ratio changed with the conversion of reactant. The conversion of styrene reached maximum near the critical density of the reaction mixture. Product selectivity also varied with density of reaction mixture and could be tuned to some degree.     

Efficient degradation of dye pollutants using dioxygen mediated by iron(Ⅱ) 2,2''-bipyridine loaded layered clay catalyst under visible irradiation

The organic-inorganic layered solid catalyst Fe(bpy)32+-laponite was able to photodegrade Rhodamine B (RhB) by activation of dioxygen under visible irradiation (λ＞420 nm), while the homogeneous aqueous solution Fe(bpy)32+ showed no photoactivity. The catalyst could be repeatedly used and retained its reactivity. The hybrid catalyst could be separated from the suspension by centrifugation or sedimentation. The TOC removal yield of RhB was measured. Reactive oxygen species (ROS) formed during degradation was detected by EPR. A possible mechanism was proposed on the basis of the experimental results.     

Spacial Structure of Cationic Phosphorus Ligand–Ru (II) Halide Complexes—by DFT Study

The increasing demand to produce enantio-pure pharmaceuticals, flavors, and other fine chemicals has advanced the field of asymmetry catalytic technologies. Among all asymmetry catalytic methods, catalytic enantioselective hydrogenation of unsaturated bonds such as olefins, ketones, and imines, which employs dihydrogen and small amounts of transition-metal complexes modified intrinsically by chiral ligands, is now recognized as being the most promising strategy for the synthesis of large amount…