MCF介孔分子筛负载Co催化环己基过氧化氢分解

以P123为模板剂，1，3，5-三甲苯（TMB）为扩孔剂，正硅酸乙酯（TEOS）为硅源，六水硝酸钴为钴源，在酸性条件下原位合成XCo-MCF （X=4%，8%，10%，20%）介孔分子筛.采用FT-IR、UV-Vis、氮气物理吸附、XRD、XPS、H₂-TPR等手段对XCo-MCF的结构进行表征，并在环己基过氧化氢（CHHP）分解反应中进行了催化性能评价.UV-Vis、XPS和XRD等表征结果表明，XCo-MCF中钴主要以Co₃O₄的形式存在.以CHHP含量为7.2%（重量百分比）的环己烷氧化液为原料，XCo-MCF催化CHHP分解，在80℃反应90 min，CHHP分解转化率均在90%以上，其中8% Co-MCF为催化剂时，CHHP转化率达到95.7%，环己醇和环己酮选择性分别为77.5%和53.4%.经过4次回收重复使用后，催化剂仍能够保持较高的活性，ICP表征表明各催化剂活性组分均存在一定程度的流失，负载量达到20%时，活性组分的流失速率得到明显抑制.     

Guggenheim法处理过氧化氢催化分解反应动力学数据

采用Guggenheim法处理过氧化氢催化分解反应动力学数据,不用测定过氧化氢完全分解时氧气的体积V∞,即可求出反应速率常数k。该方法既节省实验时间,又减少了实验误差,数据处理结果表明,该方法适用于过氧化氢催化分解反应动力学数据处理。     

过氧化氢酶催化分解反应

为了有利于学生将酶催化与一般催化反应进行对照,我们在物理化学实验中测定过氧化氢分解反应速度常数实验的基础上,应用过氧化氢转化酶来研究过氧化氢酶催化分解反应的特征.     

微酸性条件下环己基过氧化氢分解制备环己酮工艺研究

针对传统碱性分解的不足,以有机铬酸酯为催化剂,对环己烷氧化液中的环己基过氧化氢分解制备环己酮工艺进行了探索,考察了在催化剂铬离子浓度150 ppm时,分解温度及时间对环己烷氧化液分解产物的影响,得出最佳的微酸性分解工艺条件。并在连续分解实验装置对前面得到的微酸性分解工艺条件进行验证。     

双金属催化剂体系催化过氧化氢分解反应

研究了双金属催化剂体系催化过氧化氢分解反应,测量了不同催化剂体系的活化能.结果表明,双金属催化剂对过氧化氢分解反应具有良好的催化性能,且双金属催化剂存在协同催化作用;而酸性环境对过氧化氢催化分解有明显的抑制作用.     

环己基过氧化氢的气相色谱分析

环己烷液相催化氧化的中间产物环已基过氧化氢(CHHP)在高温和在某些金属元素以及一些化合物存在下容易发生分解,同时,它还具有较强极性。因此,用一般气相色谱方法直接快速地分析CHHP是有一定困难的。在工业生产和实验室分析中,常用碘量法测定混合物中CHHP的含量,然后用三苯基磷将全部CHHP还原成环己醇,并用气相色谱法测定其中环己酮、环己醇的含量,再分别算出各组分的含量。这种方法手续较多,容易引入误差。     

过氧化氢分解反应动力学实验的改进

过氧化氢分解反应实验,设备简单,直观性好,是个很好的教学实验。目前的教材中仍有采用。但是,该实验的量气装置多为立式。测量时需随时保持液面平齐。这给操作和读数带来不便。本文设计制做了一种水平量气装置。多次使用表明,操作方     

过氧化氢催化分解速率实验装置的改进

对过氧化氢分解速率实验装置进行了改进。在保持反应器体积不变的条件下,利用气压计测量反应过程中反应器内的气体压强以及压强随时间的变化的关系。通过对比,改进后的装置便于操作,灵敏度更高,且有较好的准确性。     

启普发生器中催化分解过氧化氢制取氧气

使用二氧化锰@氧化铝固载催化剂,在启普发生器中催化分解过氧化氢制备了纯净的氧气。研究了催化剂的制备方法、催化性能及重复使用,收到了满意的效果。该实验方法简便,制取氧气随机可调,为实验室制取氧气提供了一种绿色方法。     

甲醇催化分解动力学之研究

甲醇的裂解产物为H_2与CO,故甲醇被视为一种方便、安全的贮氢材料,可作为汽油的代用燃料;其裂解气作为保护气氛可广泛应用于热处理工业。甲醇裂解有两种方法,高温热裂解(约930℃)与低温催化裂解(约300℃)由于低温催化裂解有诸多优点,在工业上的应用正在发展。     

A Mathematical Model of Catalytic Decomposition of Cyclohexyl Hydroperoxide in the Presence of 3d-Metal Acetylacetonates

Decomposition of cyclohexyl hydroperoxide in the presence of 3d-metal acetylacetonates was studied by mathematical simulation.     

Hβ分子筛在环己烷过氧化氢分解中的催化活性

 使用不含过渡金属的Hβ分子筛催化环己烷过氧化氢分解反应,考察了主要产物环己醇和环己酮随反应时间和温度的变化. 结果表明, Hβ分子筛具有很高的催化活性,其TOF值高达181.9 h-1, 与贵金属催化剂5%Ru/Al2O3相当. 在125 ℃下环己醇和环己酮的总选择性达84.6%. 反应的主要副产物为环己酮缩合和羰基加成产物.     

Kinetics of Hydroperoxide Epoxidation of 1-Octene in the Presence of MoB2

We have studied the kinetics of the process of epoxidation of 1-octene by tert-butyl hydroperoxide in the presence of molybdenum boride MoB₂. We have studied the effect of the concentrations of starting materials and reaction products on the process. We suggest a kinetic scheme and we calculate the kinetic parameters of the process.     

Reaction Kinetics of the Hydroperoxide Epoxidation of 1-Octene in the Presence of Mo2B

The kinetics of epoxidation of 1-octene by tert-butyl hydroperoxide in the presence of molybdenum boride (Mo₂B) was studied. The effects of reactant and reaction product concentrations on the process were examined. A kinetic scheme was proposed, and the kinetic parameters of the process were calculated.     

Kinetics of the Decomposition of Hydrogen Peroxide in the Presence of Aqua-Pentacyanoferrate (II)

The decomposition of hydrogen peroxide has been studied in the presence of a large number of metal ions and their complexes^1,2). Interest in radiation chemistry of aqueous solutions where hydrogen peroxide is one of the products and the use of acidic ferrous sulphate solutions as dosimeter in these studies has particularly stimulated the investigation on the kinetics of decomposition of hydrogen peroxide in the presence of Fe⁺², Fe⁺³ and their complexes^1,2). Ferrous sulphate solution can be used as a dosimeter under acidic conditions only, as at higher pH the hydrolysis of Fe⁺² and Fe⁺³ interferes. Recent studies^3-6) have shown the possibility of using the aqueous solutions of ferro- and ferri-cyanides over a range of pH as dosimeter. In the studies of ferrocyanide and ferricyanide catalysed decomposition of hydrogen peroxide^7-11), it is suggested that the catalytic properties of hexacyano ferrates are through their hydrated products. The present study aims at studying the interaction of aquapentacyanoferrate¹¹) with hydrogen peroxide over a range of pH, concentration and temperature.     

Hydroperoxide Epoxidation of Ethylallyl Ethylacrylate in the Presence of Mo2B

The epoxidation of ethylallyl ethylacrylate by tert-butyl hydroperoxide in the presence of Mo₂B was investigated.     

Acid Decomposition of p-tert-Butylcumene Hydroperoxide to p-tert-Butylphenol and Acetone

Russian Journal of Applied Chemistry - p-tert-Butyphenol is a valuable product of basic organic synthesis, widely used in various branches of industry. The relationships of acid decomposition of...     

Kinetics of Pinane Oxidation to Pinane Hydroperoxide by Dioxygen

The liquid-phase oxidation of pinane to pinane hydroperoxide (PHP) by dioxygen is studied at 353–373 K and under dioxygen pressures ranging from 2 to 4 atm. The rate of pinane oxidation is described by the equation w = w _{O 2} + w _PHP, where the term w _{O 2} is independent of the PHP concentration, w _PHP is a function of the concentration [PHP] ⁿ , and n ranges from 0.5 at low [PHP] to 1.0 at high [PHP]. The cis-isomer of 2-hydroperoxopinane generates free radicals during autooxidation. The ratio of the rate constants of cis- and trans-pinane oxidation is found (k _cis/k _trans = 4.0). The selectivity of the oxidation of pinane to PHP can reach 90–95%.     

Catalytic Decomposition of Cumyl Hydroperoxide under the Action of Aspartic Acid Derivatives

The inhibiting activity of aspartic acid derivatives in the stage of degenerate chain branching in decomposition of cumyl hydroperoxide was studied. The kinetic and thermodynamic parameters of the reaction were established.