Dawson型磷钼酸及钒修饰Dawson型磷钼酸的制备及其活性研究

制备了Dawson型磷钼酸H6[P2Mo18O62](P2V0和钒修饰Dawson型磷钼酸H7[P2Mo17VO62](P2V1),用傅里叶变换红外光谱和X射线粉晶衍射进行了表征.以环戊醇为反应底物,用正交实验考察了催化剂用量,反应温度,反应时间和30%H2O2用量各因素对氧化反应的影响,并在优化条件下探索了对几种醇的催化氧化.H7[P2Mo17VO62]催化H2O2氧化苯甲醇合成苯甲酸最佳的条件为;H7[P2Mo17VO62];苯甲醇;H2O2=1;2133;9067(摩尔比),反应温度85℃,反应时间24h,苯甲醇的转化率达91.84%苯甲酸的选择性达57.23 %.     

新型N,N′,O,O′-Salen Mn(III)催化剂的制备及在烯烃环氧化反应中催化性能的研究

通过邻胺基苯酚与二醛或二酮反应制备了4种新型的N,N′,O,O′-Salen配体,再利用配体与Mn(Ac)2·2H2O配位反应合成新型Salen-Mn催化剂C1,C2,C3,C4,用FT-IR,UV-Vis和配位滴定法等方法对催化剂进行了表征;利用高斯03软件（Hartree-Fock/3-21G）对各种配体的结构进行了优化;考察了4种催化剂在环氧化反应中的催化性能.从催化结果可以看出：新型催化剂的催化活性与结构有关,其中新型催化剂C1与传统催化剂C5结构相似,在环氧化反应中都具有良好的催化活性,而新型催化剂C2,C3,C4的催化活性相对弱很多.     

钒络合物及其负载型催化剂的烃类催化氧化机理

制备了钒络合物催化剂及其分子筛负载型催化剂,并对1—辛烯、环己烷、甲苯、正己烷和正庚烷的均相及非均相催化氧化反应进行了研究。实验结果表明,非均相催化剂不但具备与均相催化剂相似的催化氧化性能,还对伯醇和对位产物有较好的择形选择性。本研究还考察了乙腈、二氯甲烷等溶剂对烃类均相及非均相催化氧化反应的溶剂效应,提出并验证了钒络合物催化剂作用下烃类催化氧化反应的自由基反应机理。     

环境空气中烷烃的光催化氧化实验改进研究

为进一步提高环境空气中烷烃的光催化氧化实验的教学效果,本文以正庚烷(n-C7H16)为目标污染物,通过改进光催化氧化实验装置,并优化催化剂二氧化钛(TiO2)的用量,确定催化时间,研究了TiO2对环境空气中n-C7H16的光催化氧化效果.结果表明:改进装置后,TiO2用量为0.50 g时,反应30 min可使n-C7H...     

柠檬酸三丁酯的新合成法

SO2 -4 /Zr O2 、Fe Cl3· 6H2 O、NH4 Fe(SO4 ) 2 · 1 2 H2 O三种催化剂对柠檬酸与正丁醇酯化反应的催化性能 ,结果表明 ,Fe Cl3· 6H2 O催化活性最高。通过系统地研究Fe Cl3· 6H2 O催化合成柠檬酸三丁酯的工艺条件 ,确定其适合的工艺流程为 :酸醇比 1∶1 2 .5,催化剂用量为 3% ,反应温度为 1 2 5℃ ,反应时间为 3h,这样酯化率可达 95%以上。     

N-苯基异羟肟酸过渡金属配合物仿生氧载体研究

考查了N -苯基异羟肟酸过渡金属配合物ML12 ～ML4 2 [M =Co(Ⅱ ) ,Cu(Ⅱ ) ,Mn(Ⅲ )Cl]的二氧亲和性和仿生催化氧化性能 制备了种二氧加合物 [CoL3 2 ·O2 ·Py]·H2 O ,并以元素分析 ,IR和TG分析表征 .测定了它们的氧合反应平衡常数和相应的热力学参数ΔHo、ΔSo.模拟单加氧酶 ,研究了锰 (Ⅲ )配合物对苯乙烯的催化环氧化 .讨论了分子结构对二氧亲和性和催化环氧化性能的影响 .     

稀土元素Ce(La)促进的Pt/β催化剂上正庚烷的临氢异构化

采用共浸渍法制备稀土元素Ce、La修饰的Pt/Hβ催化剂,通过比表面积测定(BET)、X线衍射(XRD)、NH3程序升温脱附(NH3-TPD)对催化剂进行表征,在连续流动常压固定床反应器上考察催化剂的正庚烷临氢异构化反应性能。结果表明:催化剂中Ce或La的引入提高了正庚烷转化率,同时还在很大程度上提高了异构化产物的选择性。CePt/Hβ催化剂的最佳组成为Pt负载量(质量分数)0.4%,n(Ce)∶n(Pt)=5∶1,催化剂在230℃的反应温度下表现出很高的正庚烷转化率(61.5%)和异构化选择性(96.7%),明显高于相应的Pt/Hβ催化剂性能(50.6%和82.4%)。另外,在脱铝β沸石及预先负载杂多酸(磷钨酸)的脱铝Y沸石载体上也发现了Ce或La对其催化性能的促进作用。稀土元素Ce和La通过改善催化剂酸性和Pt分散度而起到了助催化作用。     

醇还原VOPO_4·2H_2O制备VOHPO_4·0.5H_2O的活化研究

研究了醇还原 VOPO4 · 2 H2 O制备的 VOHPO4 · 0 .5H2 O,在正丁烷和空气的混合气体中活化后 ,醇对产物物相组成的影响。由伯醇制备的 VOHPO4 · 0 .5H2 O活化后 ,产物中( VO) 2 P2 O7相的结晶度和含量较高 ;随着伯醇碳原子数的增加 ,活化后产物 ( VO) 2 P2 O7的无序度增加 ;仲醇制备的 VOHPO4 · 0 .5H2 O活化后 ,最终产物中 ( VO) 2 P2 O7的含量和结晶度较低 ,且有较多的无定型和 VOPO4 相生成。研究表明 ,正戊醇 (正辛醇 )制备的 VOHPO4 · 0 .5H2 O活化后 ,正丁烷的转化率和顺酐的选择性均优于仲戊醇 (仲辛醇 )和常规方法制备的 VOHPO4 · 0 .5H2 O     

S2O82-/ZrO2-Cr2O3固体超强酸催化合成乙酸苄酯

以ZrOCl2 ·8H2 O ,CrCl3·6H2 O和 (NH4 ) 2 S2 O8为主要原料制备了新型固体超强酸催化剂S2 O82 -/ZrO2 -Cr2 O3,用于催化合成乙酸苄酯 .考察了乙酸 /苯甲醇摩尔比、催化剂用量、反应时间、带水剂种类和用量对酯产率的影响 .在典型反应条件下 (0 .5g催化剂 ,0 .18mol苯甲醇 ,0 .36mol乙酸 ,10 .0mL苯 ,回流反应 2 .0h)产率可达 80 .1% .该催化剂易于回收 ,且可重复使用 ,具有良好的活性稳定性 .     

水及还原温度对氧化铕促进的Cu-ZnO催化剂上甘油氢解性能的影响

采用共沉淀法制备了氧化铕(Eu2O3)促进的Cu-ZnO催化剂,通过X射线衍射(XRD)、N2O脉冲吸附等手段对所制备的催化剂物化性质进行表征,考察了它们在连续流动固定床反应器中甘油氢解反应的催化性能,讨论了反应液中水的质量分数及还原温度对Eu2O3促进的Cu-ZnO催化性能的影响.结果表明:引入Eu2O3不改变甘油氢解反应的产物分布,但能显著提高催化剂的稳定性;减少反应液中水含量及降低还原温度有利于提高催化剂的稳定性;稀土Eu2O3能够增强Cu-ZnO的抗水氧化能力,使催化剂表面Cu0难被水氧化而不易失活.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with