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NO2^—离子的光催化反应 总被引:3,自引:1,他引:3
对NO2离子的TiO2光催化反应研究发现,该光催化反应用于消除NO2离子效果显著.反应的动力学研究表明,NO2离子的TiO2光催化反应是一个较复杂的多步反应,其中,NO2离子在TiO2催化剂表面的光催化氧化是该反应的控制步骤,反应符合L-H动力学规律.研究还发现,反应气氛对该光催化反应有明显影响.在实验条件下未观测到产物对反应的影响. 相似文献
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总结了Mo(W)-Cu(Ag)-S原子簇化合物的反应,并把这些反应分成5类:取代反应,加成反应,降价反应,多聚反应和氧化还原反应。从低热固相反应的角度探讨了簇合物反应对合成新原子族化合物的重要性。 相似文献
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本文系统研究,综述有机物光氧化反应基础理论之一的烯烃与第一激发单重态氧分子(△态O2)的氧化反应,其中包括共轭双烯△态O2的氧化反应,单烯烃与△g态O2的氧化反应及烯(one)反应,分别介绍它们的典型反应,反应特性,反应机理及其在有机合成的应用。 相似文献
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DNA中的胞嘧啶在化学致变剂作用下会发生脱氨反应,被认为是导致基因损伤的重要原因之一,本文采用毛细管电泳测定胞嘧啶和尿嘧啶,并将此种新方法用于过氧化氢存在下胞嘧啶脱氨反应的动力学研究,结果显示该反应对过氧化氢和胞嘧啶均为一级反应,反应活化能为70.35kJ.mol^-1,明显低于自发脱氨反应,表明过氧化氢可以加速胞嘧啶脱氨反应。 相似文献
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化学振荡与生化、生理现象关系密切,有维生素C参与的化学振荡反应也很引人注目.赵学庄等对维生素C存在的B-Z反应的振荡行为与机理进行了研究.他们的实验表明,当加入维生素C时,B-Z反应的诱导期增长,振荡周期增大,振荡寿命缩短,与向反应体系加入等量的Br-所产生的影响是一致的,并由此推断,维生素C对B-Z反应的影响可能是由维生素C与BrO反应生成Br-抑制了此反应的化学振荡,据此,凡是能与BrO反应生成Br-的物质,其对B-Z反应的影响必将类似于维生素C,硫酸羟胺与水合肼就属于此类物质.本文初步研究了它们对B-Z反应的影… 相似文献
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概述了Ru催化的碳氢键的活化反应,包括C-H/烯烃,C-H/炔径和C-H/CO/烯烃 偶联反应,加氢酰化反应,硅化反应。 相似文献
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《Journal of Coordination Chemistry》2012,65(9):1530-1540
The reaction between boron trifluoride methanol complex and sodium methoxide in methanol solution was investigated using conductivity as the reaction indicator. The reaction conditions were examined and a mechanism of this reaction was proposed. Moreover, proper reaction conditions were proposed for boric acid preparation using this reaction. 相似文献
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室温下FeCl3用于催化三聚异丁烯(TIB)与乙酸酐的酰化反应.发现FeCl3在所研究的催化剂中是最有效的.考察了FeCl3的用量、乙酸酐的用量和反应时间等因素对该酰化反应的影响.该反应产生一种混合物,其中两种产物是主要的.当反应在1 mmol TIB/15 mmol乙酸酐/0.50 mmol FeCl3/0.43 g氯仿和25℃下进行2 h时,生成的两种主要产物的总产率为69%.另外,反应在由沸石和FeCl3或P2O5组成的共催化剂存在下进行.该反应也用HY和H-β沸石之类的多相催化剂进行了尝试.负载FeCl3的HY和H-β沸石催化剂比FeCl3具有更高的催化活性和选择性. 相似文献
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Kinetics of the 2,4,6-trinitrophenol reaction with iron powder was investigated voltammetrically. The process was found to
be mainly governed both by the iron powder characteristics and by the solution composition. Degradation kinetics was generally
represented by a pseudo-first-order rate law. Consecutively, the 2,4,6-trinitrophenol reduction reaction rates for three fractions
of iron powder as well as the effect of individual ions presented in the reaction system were evaluated. A correlation between
the reaction rate and both the grain size of iron particles and the state of their surface was found. The effect of the reaction
system composition was investigated for two types of buffered medium: Britton-Robinson buffer (boric acid, orthophosphoric
acid, and glacial acetic acid) and acetate buffer solution (sodium acetate and acetic acid). 相似文献
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[reaction: see text] The tandem intramolecular Michael-aldol reaction was studied as a tool for the construction of the C-ring of hexacyclinic acid. By changing the reaction conditions it was possible to selectively obtain either the kinetic or the thermodynamic product. Retro-aldol reaction and subsequent epimerization provides four individual cyclopentane derivatives that can be incorporated as building blocks in natural product syntheses. 相似文献
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Maxim A. Mironov Maria N. Ivantsova Maria I. Tokareva Vladimir S. Mokrushin 《Tetrahedron letters》2005,46(23):3957-3960
An accelerating effect of nucleophilic additives was revealed for the Passerini multi-component reaction. The influence of aqueous solutions on the reaction rate was studied in detail and the direct involvement of water in the bond-making step was attributed as the basis of an accelerating effect. Other nucleophiles were tested as alternatives to water; as a result N-hydroxysuccinimide is proposed as an accelerant of the Passerini reaction. 相似文献