Fe/MnO-ZnZSM-5双功能催化剂上合成气直接转化为芳烃的反应

 探讨了Fe／MnO－ZnZSM－5（n（SiO2）／n（Al2O3）＝50）双功能催化剂上合成气直接转化为芳烃的反应，考察了反应温度和Zn载量对CO转化率及芳烃选择性的影响．结果表明，Fe／MnO－ZnZSM－5具有良好的合成气芳构化性能，在V（CO）∶V（H2）∶V（Ar）＝3∶6∶1，SV＝1600h－1，p＝1．1MPa，T＝543K的条件下，CO转化率可达到98．1％，芳烃产物选择性可高达53．1％．催化剂经60h运转后，CO转化率仅降低0．5％，显示了良好的稳定性和应用前景．     

ICP-AES法测定锌阳极中的铝、镉、铁、铜、铅

通过分析高频功率、雾化压力、辅助气流量和泵速等试验条件，建立了ICP-AES法测定锌阳极中铝、镉、铁、铜、铅的方法。用该方法测定锌阳极中的铝、镉、铁、铜、铅，其RSD分别为0.17%、0.63%、2.7%、5.2%、2.5%，回收率分别为99.3%-101.2%，99.3%-100.3%、97.1%-102.2%、97.8%-102.9%。对锌阳极试样进行测定，该方法的测定结果与GB4951-85方法的测定结果基本一致。     

D,L-1,2,2-三甲基环戊烷-1,3-二胺硝酸镍配合物的合成、结构及其和手性D-(+)-1,2,2-三甲基环戊烷-1,3-二胺氯化镍配合物的对比分析(英)

A nickel(Ⅱ) complex [Ni(La)₂](NO₃)₂ (1) with bidentate racemic 1,2,2-trimethylcyclopentane-1,3-diamine ligand has been synthesized and characterized by IR, EA, ES-MS, and its X-ray diffraction study reveals that the nickel(Ⅱ) center is tetra-coordinated by one D- and one L- diamine ligands, and a three-dimensional hydrogen-bond-sustained network is formed in the solid state by means of the eight-membered N-H…O hydrogen bond cycle. This compound also supplies a good comparison to the chiral complex [Ni(L_b)₂]Cl₂·2H₂O (2) (L_b=D-(+)-1,2,2-trimethylcyclopentane-1,3-diamine). CCDC: 218122.     

三核钼原子簇化合物的EPR和电子结构

本文报道一个新的三核钼原子簇化合物在室温和77K固态和液态的EPR谱,这些谱均呈现出a,b两套谱线的叠加,分析谱线的强度比,线宽和谱参数,认为g值较大的a谱归属于三核钼原子簇化合物,而b谱归属于单核钼杂质。从由X射线晶体结构方法确定的空间结构出发,三核钼原子簇化合物可能有两种分子形式:Mo3(μ3-S)(μ2-S)3Cl[S2P(OEt)2]4 1Mo3(μ3-S)(μ2-S)(μ2-Cl)2Cl[S2P(OEt)2]4 2分别用简单量子化学理论和EHMO法计算出未配对电子所处的分子轨道,求出g1和g1,并与EPR实验值相比较,认为该化合物的分子式应为2,簇骼{Mo3}属七电子体系,在77K温度下,其未配对电子主要局域在三个钼原子所组成的近似等腰三角形簇骼的顶点钼原子周围。     

我国青海高原环境低硒的状况及影响

选择分布于青海高原不同地区和不同地形条件下36个县市的113个采样点，检测了一千余个各种土壤-植物-动物(人)样品的含硒量，表明青海缺硒和严重缺硒的地区占全省总面积的94％，而不缺硒的地区在占6％，同时还查明：(1）土壤含硒量与植物中的含硒量呈现明显的正相关(γ=0．945)，土壤-植物-动物(人)机体的含硒量分析都呈现相互关联的链条关系。(2)不同地形的土壤含硒量有较大的差异，一般河谷水浇地硒含量要高于山地。(3)生长在相同土壤中的植物。因其品种不同而呈现出聚硒能力的差异。(4)动物在缺硒条件下，体内人和组织硒水平迅速下降。(5)在相同缺硒地区生活的人群，由于膳食结构不同。摄入硒的多少也不同。因而导致体内含硒量的差异。大骨节病、心脏病及癌症病人的血硒含量明显低于当地正常人的水平。本研究将为协调环境与生物(包括人体健康)的关系和进一步研究硒元素在自然界中的生态循环规律提供基础。     

尼龙-1010结晶结构

用WAXD方法测定了Nylon-1010为三斜晶系结晶结构;α=4.9(?),b=5.4(?),c=27.8(?),α=49°,β=77°,γ=63.5°,每个聚合物单胞含有一个重复单元,空间群为P(?)。模压试样用Ruland方法分析结晶度为60％。以上。电子密度相关函数法分析了SAXS现象,求得了Nylon-1010结晶片层厚度、过渡层厚度、长周期、比内表面及电子密度差。     

离子液体支载稀土催化剂催化 2,2-二甲基-三亚甲基碳酸酯均聚及其与ε-己内酯的共聚

首次合成了离子液体支载稀土催化剂,并探讨了其催化2,2-二甲基-三亚甲基碳酸酯(DTC)均聚及其与ε-己内酯(ε-CL)的共聚,结果表明该新型催化剂能有效地催化DTC的均聚及其与ε-CL的共聚.研究了不同稀土以及加料顺序等反应条件对聚合的影响,发现轻稀土的催化活性比重稀土高,其中离子液体支载La催化剂的催化活性最高,而通过控制不同的加料顺序可以制备DTC和ε-CL的无规及嵌段共聚物.对共聚物结构进行了表征.     

纳米镍-铁合金/膨胀石墨复合材料的制备、表征及其电磁屏蔽性能

The composites with nano-particles of Ni-Fe alloys dispersed on the nano-layers of expanded graphite (EG) were prepared by the impregnation of EG with ethanol solutions of nickel and iron acetates， followed by drying and reduction in H₂. The square nano-particles of Ni-Fe alloys with particle sizes of mainly 20～40 nm were found to be well spread on the layers of EG. The alloy nano-particles exhibited high shielding effectiveness (SE) for electromagnetic radiations at low frequencies due to their high magnetic conductivity. Since EG is electronically conductive and displayed high SE at high frequencies， the composites exhibited good SE at wide range of frequencies. The electric and magnetic conductivities of the composites could be monitored through regulating the loadings of alloy nano-particles on EG， and it was found that the composites with 20%～40% of the alloys exhibited good SE. Specifically， the composite 27%Ni-3%Fe-EG showed the excellent SE from 66 to 110 dB at the frequencies from 300 kHz to 1.5 GHz.     

Baeyer-Villiger oxidation of ketones with hydrogen peroxide catalyzed by Sn-aniline complex

Sn-aniline complex was prepared by a simple procedure.Cyclic and acyclic ketones were oxidized into lactones or esters with very high selectivity and yield with 30% hydrogen peroxide in the presence of Sn-aniline complex.     

Synthesis,Mass Spectrometric Studies,and Biological Evaluation of 3,5-Dimethoxyhomophthalic Acid and Related Compounds

3,5-Dimethoxyhomophthalic acid was synthesized in four steps from 3,5-dimethoxycinnamic acid via a series of reactions including cyclization of 3-(3',5'-dimethoxyphenyl)propionic acid to 5,7-dimethoxy-1-indanone and oxidative decomposition of methyl-2-hydroxy-2-[5,7-dimethyoxy-1-oxo-1H-inden-2(3H)-ylidene]acetate to 3,5-dimethoxyhomophthalic acid.The synthesized compounds were characterized by elemental analysis,IR,1H NMR,and MS.The biological evaluation experiments of 3,5-dimthoxyhomophthalic acid and the related synthesized compounds were also carried out.Naturally occurring biologically active isocoumarins were prepared in a single step by the condensation of the homophthalic acid with appropriate acid chlorides.