PTCs promoted biphasic oxidation of ethylbenzene catalyzed by NHPI and CoSPc

An easy workup and environmentally friendly method to convert ethylbenzene into the corresponding oxides,catalyzed by a combined catalytic system consisting of NHPI and CoSPc,was developed in a water involved liquid-liquid heterogeneous system.Experimental results showed that the reaction performed well facilitated by PTCs at multigrams material level,under which the conversion rate of ethylbenzene and the selectivity of acetophenone reached 60.6% and 95.2% after 0.5 h of reaction in oxygen atmosphere.An oxidation process was proposed at the end of this paper.     

原位红外光谱法研究沸石催化剂上苯与乙烯烷基化反应

采用原位红外光谱技术,于１２０￣２００℃下,对沸石催化剂上苯与乙烯烷基化的反应机理进行了探讨,结果表明,乙烯,苯和乙苯吸附在催化剂的同一类活性中心上,它们之间存在着竞争吸附,乙烯的吸附能力较苯和乙苯强;吸附的乙烯可与吸附的苯或乙苯发生烷基化反应。催化剂上已吸附乙烯时,由于乙烯在强吸附位上吸附较牢,苯和乙苯不易吸附,烷基化反应难以进行,且吸附的乙烯间可发生反应。乙烯与乙苯的反应内烯与异丙苯的反应难于     

两种催化裂化干气加工利用方案的对比

催化裂化干气直接加工利用是炼厂副产气体综合利用的重要内容。本文选择工艺技术比较成熟的两种加工方案进行技术经济对比,结论是烃化制乙苯方案的经济性能比羰基化制丙醛、丙酸方案差,但从工艺开发成熟程度和市场需求来看,前一方案的发展规模将比后一方案大。     

A possible construction of chemical reaction networks

The chemical reaction networks and the sequence networks represent the pathways of a complex chemical process. In order to study the pathways separately the systematization of the elementary processes included in the possible mechanism is inevitable.This systematization was realized by a special procedure based on linear algebraic methods and enabled us to select the corresponding processes from the possible mechanism. The efficiency of the procedure has been illustrated by its application to the liquid phase oxidation of ethylbenzene and the elementary processes have been selected using a computer program.     

The (p, ρ, T) of (methanol + benzene) and (methanol + ethylbenzene)

The (p, ρ, T) of methanol, ethylbenzene and (methanol + benzene) and (methanol + ethylbenzene) at temperatures between (290 and 500) K and pressures in the range (0.1 to 60) MPa have been measured with a magnetic suspension densimeter with an uncertainty of ±0.1%. Our measurements with methanol deviate from the literature values by less than 0.2%. The (p, ρ, T) measurements were fitted with experimental uncertainties by an empirical equation. The temperature and mole fraction dependence of the coefficients of the equation of state are presented.     

合成乙苯ZSM—5催化剂的FT—IR研究

ZSM-5沸石由于具有独特结构,作为新型的择形催化剂广泛应用于石油化工催化反应中.人们普遍认为这些催化反应是由于沸石的酸中心引起的,尤其是B酸中心,因此对此做了较多的研究.我们选用不同反应时间,苯与乙烯气相烷基化合成乙苯ZSM-5催化剂,用吡啶吸附方法研究了ZSM-5催化剂的酸性,结合催化剂活性考察数据,得到了一些有意义的信息.     

As-V-O簇合物对乙苯选择氧化反应的催化活性

通过水热方法合成了簇合物［Ｎ（ＣＨ３）４］４［Ａｓ８Ｖ１４Ｏ４２（８Ｈ２Ｏ）］及其相近的同多及杂多钒氧簇Ｋ６Ｖ１０Ｏ２８·９Ｈ２Ｏ，ＮａＫＶ２Ｏ６，（Ｈ２Ｅｎ）０．５Ｖ２Ｏ５，（Ｈ２Ｅｎ）３（ＶＯ）９（ＰＯ４）８，Ｎａ３ＶＯ（ＨＰＯ４）（ＰＯ４）·Ｈ２Ｏ．运用ＸＲＤ和ＩＲ等手段表征了［Ｎ（ＣＨ３）４］４［Ａｓ８Ｖ１４Ｏ４２（８Ｈ２Ｏ）］的结构．该类化合物对于催化乙苯过氧化氢选择氧化制苯乙酮具有较高的催化活性．通过比较含钒与不含钒化合物的活性情况，讨论了催化氧化的活性中心．     

改性FeZSM－5沸石上乙苯的吸附和扩散性质及氧化脱氢催化作用

用ＸＰＳ、ＤＲＳ及Ｍｏｓｓｂａｕｅｒ谱对水热处理改性的ＦｅＺＳＭ－５中Ｆｅ（Ⅲ）的化学状态进行了研究，并定量地考察了水热处理时间对骨架铁含量的影响，比较了不同水热处理时间及不同平衡阳离子交换的ＦｅＺＳＭ－５上乙苯的吸附及扩散性质。水热处理将使骨架铁从骨架析出，但析出的骨架铁并不阻塞孔道，而是高分散在分子筛的表面上，乙苯的吸附量随水热处理时间增加而增大。阳离子交换的ＦｅＺＳＭ－５上乙苯的扩散系数及吸附量均按Ｈ、Ｌｉ、Ｎａ、Ｋ离子半径增大的顺序递减。乙苯的氧化脱氢活性主要取决于Ｆｅ（Ⅲ）活性中心的性质，也与乙苯的吸附量及扩散系数有关。