脉冲电晕环境中13X分子筛对NO分解作用的研究

在常温、常压下，利用脉冲电晕放电产生冷等离子体，使一氧化氮发生分解，直接生成氮气和氧气，用四极杆质谱仪在线测量反应过程中反应物和生成物的变化。在自行研制的实验台上，考察了13X分子筛在不同的脉冲电晕放电条件下，表现出来的不同特性及其对反应转化率的影响。在30 ℃～430 ℃、流量375 mL/min～1 333 mL/min，分析了该反应过程中13X分子筛对转化率的促进作用。在同一脉冲放电条件下，控制13X分子筛的温度为200 ℃，转化率从30 ℃时的1.2%上升到19.7%；转化率最高可以达到35.9%。并对反应过程中13X分子筛的吸附特性做了初步探讨。     

脂族酰基过氧化物分解动力学的研究V.对称脂族酰基过氧化物的羧基转化反应

测定了过氧化月桂酰(1),过氧化辛酰(2),过氧化己酰(3)和过氧化3,5,5-三甲基己酰(4)在热分解过程中生成的羧基转化产物[RC(O)OC(O)OR,R=正十一烷基(5),正庚基(6),正戊基(7),2,4,4-三甲基戊基(8)]的含。在同样条件小,4生成的羧基转化产物比1,2和3的多。羧基转化反应受溶剂极性和粘度的影响,但温度的影响较小。转化产物的分解受体系中相应脂肪酸的催化。直接光照可生成少量转化产物,二苯酮光敏化不产生羧基转化产物,文中对反应机理进行了讨论。     

锂离子二次电池电解质材料LiPF6的制备及表征

0引言 液态锂离子电池自1990年开发成功以来,由于具有比能量高、工作电压高、应用温度范围宽、自放电率低、循环寿命长、无污染、安全性能好等许多独特的优势[1],所以其发展前景十分广阔.目前液态锂离子二次电池中开发使用的无机阴离子导电盐主要有LiClO4、LiPF6、LiAsF6等,但LiClO4为强氧化剂,使用不安全而不宜用于电池,LiAsF6虽然性能颇佳,但有毒且价格较贵,故也不宜广泛使用.LiPF6被认为是目前较合适的电解质[1],但其制备困难,价格较贵,且目前报道的合成方法也多是以HF为介质[2～5].本文作者以PF5和LiF为原料在CH3CN溶剂中简单有效地合成了高纯LiPF6,并通过在手套箱中制样的方法对目标产物进行了红外、热重和X射线衍射分析,给出了LiPF6的红外光谱图、热重分析数据和X射线衍射图.     

Concise and Efficient Synthesis of Dehydropeptide Analogues from Unsaturated 5（4H）—Oxazolone

Some dehydropeptide analogues were directly synthesized by the reaction of unsaturated oxazolones with free amino acids.     

铁(III)卟啉催化β-胡萝卜素分解动力学研究

使用BeckmannDU-8B紫外可见分光光度计研究了以氯合四－间三甲苯基卟啉铁（Ⅲ）（FeTMPCl）为催化剂，间氯过氧化苯甲酸（mCPBA）为氧化剂，咪唑（I_m）、2－甲基咪唑（MeI_m）、2－乙基－4－甲基咪唑（EMI_m）为轴向配体，催化β-胡萝卜素（β－cte）氧化分解为维生素A的动力学规律，提出了反应机理，研究了温度、催化剂浓度、氧化剂浓度及轴向配体对反应速率的影响，应用Gauss－Newton－Marquardt方法求得各基元反应的有关动力学参数．     

Dienone—phenol Rearrangement of C—9 Oxygenated Decalinic Dienone and Analogs through B—Ring Cleavage

Dehydrogenation of 9-hydroxy decalinic enones and analogs with DDQ resulted in a formal dienone-phenol type rearrangement via B-ring cleavage, while the corresponding dienone acetates underwent base-catalyzed formal dienone-phenol type rearrangement analogously.     

1，4-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)丁二酮-(1，4)合双铜(Ⅱ)配合物的合成、表征、非等温热分解反应动力学及电化学性质

The paper reported the synthetic procedure and character of Copper(Ⅱ) binuclear coordination compound of 1,4-bis-(1′-phenyl-3′-methyl-5′-pyrazolone-4′)-1,4-butanedione. The non-isothermal kinetic of the thermal decomposition of the complex has been studied from the TG-DTG curves by means of the Achar et al and Coats-Redfern methods. The electrochemical characterization of the complex were studied by means of powder microelectrodes technique.     

分解水制氢的KNO3—I2循环之研究：Ⅲ.代替电解反应的一个子循环

本文提出了一个硫酸中间盐子循环用以代替分解水制氢的KNO_3-I_2混合循环中的电解反应,从而使原混合循环变为一个纯热化学循环。     

The Direct Resolution of the Enantiomers of Four Chiral Pesticides

Cellulose-tris(3,5-dimethylphenylcarbamate)(CDMPC) were synthesized as highperformance liquid chromatography (HPLC) chiral stationary phase(CSP). The successful resolution of four chiral pesticides on the CSP was realized and the influence of the temperature on the separation was studied.     

纳米晶PbTiO3负载CuO催化NO分解

A large specific surface area perovskite-type mixed oxide PbTiO₃ supported cupric oxide was synthesized as a catalyst for NO decomposition and characterized by techniques such as XPS, XRD, H₂-TPR before and after NO decomposition reactions. The catalytic properties were tested with a fix-bed micro-reactor. The results showed that the PbTiO₃ was inactive for the reactions, but 1wt % Cu/PbTiO₃ catalyst gave fairly good activities for NO decomposition at temperature as low as 473 K. Copper species were found well-dispersed but weakly interacted with the support before NO decomposition, and the NO decomposition caused significant change in the environment of the copper species, which became Cu(Ⅰ) and most probably incorporated into surface crystal lattice of the nano-sized PbTiO₃. In NO reaction, a large amount of oxygen atoms from the decomposition of NO penetrated into the nano-sized PbTiO₃ support and caused small expansion of crystal lattice. The transport of oxygen between the copper species and the catalyst support may be helpful to speed up the kinetic regeneration of active metal sites from oxygen occupancy and resulted in good catalytic performance.