调节剂对苯加氢均相催化剂性能的影响及H2型催化剂的研制

苯加氢均相催化剂属于齐格勒型催化剂,调节剂对其催化性能影响很大。研究结果表明,催化剂的初活性与微量水分有很大关系,催化剂的稳定性取决于其它调节剂的使用。通过选择合适的调节剂,制得了适合工业生产需要的高活性、长寿命的催化剂H2,与法国石油研究院开发的同类催化剂相比,初活性相当,使用寿命大大提高。     

苯加氢催化剂研究进展

介绍了苯加氢催化剂的分类,综述了均相催化剂、多相催化剂和离子液体催化剂的研究进展和生产工艺情况,其中多相催化剂可以对苯进行液相加氢和气相加氢。对苯加氢催化剂的评价和分析方法做了综述,讨论了苯加氢催化剂的加氢机理,对催化剂表面的吸附方式、反应速率的控制、苯和氢吸附的形式和分类问题做了说明。     

固相加氢催化剂在苯加氢新装置上的工业应用

介绍了SCB-1固相加氢催化剂在苯加氢新装置副反应器上的工业应用。经过对催化剂性能指标对比评价,SCB-1固相加氢催化剂在活性组成、尺寸、比表面积参数上与进口催化剂的参数接近,堆密度和强度指标又优于进口催化剂。通过优化工艺参数,产品质量不断得到优化,并能保证SCB-1固相加氢催化剂活性持久,延长该催化剂的运行周期至9年。通过在苯加氢装置生产中的使用,表明SCB-1固相加氢催化剂是一种机械强度高、活性好的苯加氢催化剂,该催化剂性能优于国外的同类产品,完全可以替代国外的进口催化剂。产品纯度达到99.96%,产品中苯质量分数小于10 mg/kg。     

新型NCG-6苯加氢催化剂的研究与工业放大

应用常压原粒度活性评价装置，对气相苯加氢制环己烷的Ni／M203苯加氢催化剂进行研究评价与条件试验，考察助催化剂、中和条件对催化剂性能的影响；通过实验对比表明，NCG-6型苯催化剂的性能达到并优于各参比催化剂的水平。通过工业放大表明，NCG-6型苯加氢是一种催化活性高、机械强度好、热稳定性提高的新型苯加氢催化剂。     

苯加氢生产环己烷技术展望

本文介绍了由苯加氢生产环已烷的主要技术路线及有关进展情况。指出,IFP 的两段加氢工艺在苯加氢生产环己烷的三大类方法中具有明显的优点,受到人们的普遍重视。有机金属络合物催化剂的应用进一步增强了 IFP 工艺的竞争力。国产的苯加氢均相催化剂在活性和选择性方面与法国的同类催化剂 HC102水平相当,使用寿命大大提高。     

HC—402—2型苯加氢均相催化剂的改进

ＨＣ－４０２－２型苯加氢均相催化剂经过改进，去除催化剂中的水份，降低异辛酸镍环己烷溶液中乳化物含量后，在保持加氢效果不变的前提下，大幅度提高了催化剂的抗水性能、延长了催化剂的使用寿命。     

浅谈均相加氢催化剂的工业应用现状

较详细地叙述了法国石油研究院开发的 VAPIDROL 法均相加氢工艺及其工业应用情况,同时还阐述了辽阳石油化纤公司研究院研制的苯加氢均相催化剂的使用性能及特点。     

全馏分粗苯加氢精制技术的研究

通过在原料中加入一定比例的高沸点稀释油,于固定床加氢装置上,实现全馏分粗苯的直接加氢精制和长周期运转。实验考察了反应氢分压、温度、空速等工艺条件对全馏分粗苯加氢效果的影响以及催化剂的活性稳定性。全馏分粗苯加氢精制生成油经分馏后,可得到清洁的苯、甲苯、混合二甲苯等产品。     

NCG-98H新型苯加氢催化剂的工业应用

介绍了NCG-98H新型苯加氢催化剂在环己烷装置中的应用情况。应用结果表明,新型苯加氢催化剂具有催化活性及选择性高、热稳定性好、副产蒸汽压力高、工业装填方便等特点,经济效益显著,值得在同类装置上推广应用。     

苯加氢制环己烷的齐格勒型均相催化剂的研制

本文报道了国产HC—402—2型苯加氢均相催化剂的组成和性能,并与法国同类型的HC—102型催化剂作了对比。小试和工业应用的结果表明,国产HC—402—2型催化剂优于法国HC—102型催化剂。     

用催化剂表面修饰以进行苯选择加氢制环己烯的研究

1 前言常规的气相苯催化加氢反应,苯环大π键一经打开就全部加氢到底,产物中只能获得环己烷而极难得到选择加氢产物环己烯。生成环己烷的反应从热力学上看远比生成环己烯的反应容易进行很多,并且环己烯也非常容易进一步加氢生成环己烷。但催化剂的表面经修饰剂作用后可根本改变其性能,从而改进催化活性及选择性,或实现常规方法不可能实现的反应,获得不易得到的产物。在经表面修饰的催化剂上进行苯加氢反应可获得选择加氢产物环     

钌催化苯选择加氢制环己烯的研究进展

介绍了钌催化苯选择加氢制环己烯这一经济、安全、高效的环己烯制备新工艺的研究进展,着重介绍了液相法苯选择加氢制环己烯钌系催化剂的研究及其对苯液相选择加氢制环己烯反应的各种影响,指出钌催化刘应用于苯液相选择加氢制环己烯一般选择反应温度为150℃～190℃,压力4MPa～5MPa,加入助催化剂及添加剂可以提高环己烯的收率．钌催化苯液相选择加氢制环己烯的反应是一个非常复杂的四相(水、气、油、固)反应体系,对这个四相复杂反应体系的深入研究,有助于找出加快环己烯从催化剂表面脱附的方法,进一步提高环己烯的收率．     

Improved stability of a bimetallic Ni-Pt catalyst for hydrogenation of acetophenone and substituted derivatives

The hydrogenation of acetophenone and its derivatives was studied using several supported Ni catalysts. Ni supported on zeolite Y catalyst offered the best hydrogenation activity. However, the activity of this catalyst decreases significantly on recycle and the extent of deactivation differs with respect to the substrate investigated. It is shown in this paper that a bimetallic Ni-Pt catalyst gives improved stability on recycle for hydrogenation of acetophenone and its derivatives. The role of zeolite Y support and a strong synergistic effect in a bimetallic Ni-Pt catalyst has been discussed.     

Homogeneously catalyzed hydrogenation and gas-liquid chromatographic analysis of the methyl esters of cyclopropene fatty acids

Various concentrations of cyclopropene fatty acids have been determined down to 0.2% by the use of gas liquid chromatographic (GLC) analysis of the methyl esters of fatty acids that have been quantitatively hydrogenated using a homogeneous transition metal complex catalyst. The effectiveness of the use of bromotris(triphenylphosphine)-rhodium(I), Br(P(C₆H₅)₃)₃Rh, as a homogeneous hydrogenation catalyst to convert the cyclopropene ring to a cyclopropane ring has been evaluated and compared with the analogous chloro- and iodo-complexes. The hydrogenation/GLC method of analysis has been compared with the method of titration with hydrogen bromide in benzene and with the method involving the use of high resolution nuclear magnetic resonance (NMR).     

Homogeneous Rh-Sn alkoxide coatings on silica surfaces: A novel route for preparation of bimetallic Rh-Sn catalysts

The reaction of [{(COD)Rh}₂Sn(OEt)₆], where COD = 1,5-cyclooctadiene and Et = ethyl, with silanol groups on silica surfaces is shown to lead to near-monolayer coverage of the silica by the Rh-Sn organometallic compound. Heating the supported compound at 498 K yields a catalyst that is active for benzene hydrogenation at room temperature. When the catalyst is reduced in H₂ at 823 K, the benzene hydrogenation activity increases with a simultaneous drop in the activity for n-butane hydrogenolysis. High temperature reduction leads to formation of Rh-Sn alloy particles with an average particle diameter of 2.5 nm. These particles are stable towards oxidation-reduction cycles involving oxidation at 773 K in 15% O₂. When normalized to the benzene hydrogenation activity, the n-butane hydrogenolysis activity of the bimetallic catalyst is suppressed by over 3 orders of magnitude when compared to a monometallic Rh catalyst.     

Benzene selective hydrogenation over supported Ni (nano-) particles catalysts: Catalytic and kinetics studies

This report aims to reduce the benzene in a mixture of benzene and toluene as a model reaction using catalytic hydrogenation. In this research, we developed a series of catalysts with different supports such as Ni/HMS, Ni/HZSM-5, Ni/HZSM5-HMS, Ni/Al_2O_3 and Ni/SiO_2. Kinetic of this reaction was investigated under various hydrogen and benzene pressures. For more study, two kinetic models have also been selected and tested to describe the kinetics for this reaction. Both used models, the power law and Langmuir–Hinshelwood, provided a good fit toward the experimental data and allowed to determine the kinetic parameters. Among these catalysts, Ni/Al_2O_3 showed the maximum benzene conversion(99.19%) at 130 °C for benzene hydrogenation. The lowest toluene conversion was observed for Ni/SiO_2. Furthermore, this catalyst presented high selectivity to benzene(75.26%)at 130 °C. The catalytic performance(activity, selectivity and stability) and kinetics evaluations were shown that the Ni/SiO_2 is an effective catalyst to hydrogenate benzene. It seems that the surface properties particularly pore size are effective parameter compared to other factors such as acidity and metal dispersion in this process.     

镍系SBS加氢反应机理及加氢催化剂制备研究

对镍系SBS催化加氢机理进行了探讨,对催化剂制备工艺进行了优化。当催化剂组分质量浓度为2～4 g/L,陈化温度为50～70℃,n(Al)/n(Ni)为3～6时催化剂活性最高。向待加氢胶液中加入一定量破杂剂A可使催化剂活性及稳定性有一定程度提高。用该法制备的催化剂有较好的稳定性,常温下放置一个月其催化活性几乎没有变化。