杂多酸催化H2O/THF或乙醚中三组分一锅煮合成α-胺基膦酸酯

发现杂多酸是在水/四氢呋喃或乙醚中三组分一锅煮高产率合成α-胺基膦酸酯的有效催化剂.研究了催化剂用量、反应溶剂、醛和胺的结构对反应的影响.     

Preparation of Nano-Sized γ-Al2O3 Supported Iron Catalyst for Fischer-Tropsch Synthesis by Solvated Metal Atom Impregnation Methods

Two types of small iron clusters supported on γ-Al2O3-RT(dehydroxylated at room temperature) and γ-Al2O3-800 (dehydroxylated at 800 ℃) were prepared by solvated metal atom impregnation (SMAI) techniques. The iron atom precursor complex, bis(toluene)iron(0) formed in the metal atom reactor, was impregnated into γ-Al2O3 having different concentrations of surface hydroxyl groups to study the effect of surface hydroxylation on the crucial stage of iron cluster formation. Catalysts prepared in this way were characterized by TEM, M(o)ssbauer, and chemisorption measurements, and the results show that higher concentration of surface hydroxyl groups of γ-Al2O3-RT favors the formation of more positively charged supported iron cluster Fen/γ-Al2O3-RT, and the lower concentration of surface hydroxyl groups of γ-Al2O3-800 favors the formation of basically neutral supported iron cluster Fen/γ-Al2O3-800. The measured results also indicate that the higher concentration of surface hydroxyl groups causes the rapid decomposition of precursor complex, bis(toluene)iron(0), and favors the formation of relatively large iron cluster. Consequently, these two types of catalysts show different catalytic properties in Fischer-Tropsch reaction. The catalytic pattern of Fen/γ-Al2O3-RT in F-T reaction is similar to that of the unreduced α-Fe2O3 and that of Fen/γ-Al2O3-800 is similar to that of the reduced α-Fe2O3.     

贵金属催化剂用于抽余油加氢精制

研制了一种以铂为主的担载型芳烃抽余油加氢精制催化剂。与传统的Ni-Mo-Al型催化剂相比,上述贵金属催化剂使用温度低(160—185℃),空速高(4—6h~(-1)),寿命长。是一种较为理想的抽余油加氢催化剂。该催化剂已在工业上得到成功应用。     

将穆斯堡尔谱应用于煤炭催化液化的研究——Ⅱ.某些变数对铁催化剂转化的影响

在以铁系物为煤液化催化剂的反应中,新生Fe_(1-x)是催化活性物种。Monta no认为煤液化条件下,FeS_2向Fe_(1-x)S转化的过程依赖于反应时间、温度和液化煤种。随着液化反应时间的增长,温度的提高,FeS_2转化率增大。液化反应体系的H_2S气体分压影响着Fe_(1-x)S的化学计量式。本文用穆斯堡尔谱研究了煤在铁系催化液化反应中,几种因素对Fe_(1-x)S生成情况的影响。     

聚γ-[N,N-双(β-乙硫乙基)胺基]丙基硅氧烷铑配合物的合成及其催化硅氢化性能

从二(β-氟乙基)烯丙胺出发,通过乙硫醚化、硅氢加成、气相法二氧化硅固载,再与三氯化铑作用,合成了标题配合物,它们是烯烃与三乙氧基硅烷的硅氢加成反应的有效催化剂,对其催化特性进行了研究。     

POLYMER-SUPPORTED LEWIS ACID CATALYSTS. Ⅵ. POLYSTYRENE-BONDED STANNIC CHLORIDE CATALYST

A polystyrene-bonded stannic chloride catalyst was synthesized by the method of lithium polystyryl combined with stannic chloride. This catalyst is a polymeric organometallic compound containing 0.25 mmol Sn (Ⅳ)/g catalyst. The catalyst showed sufficient stability and catalytic activity in organic reaction such as esterification, acetalation and ketal formation, and it could be reused many times without losing its catalytic activity.     

低温加氢催化剂的设计: 理论与实践

简要总结了我们在C=C及C=O双键低温加氢双金属催化剂方面的最新研究成果. 首先, 我们以环己烯加氢为探针反应, 证明了平行使用多种研究手段的重要性, 包括单晶表面的基础研究与DFT计算, 多晶表面的合成与表征, 负载型催化剂的制备与性能测试等. 其次, 总结了双金属催化剂在其他加氢反应, 如丙烯醛C=O双键的选择性加氢, 苯的低温加氢, 以及乙炔的选择性加氢等反应中的应用. 最后, 讨论了利用金属碳化物代替贵金属Pt以减少双金属催化剂中Pt用量的可能性.     

二氧化碳—环氧丙烷—甲苯二异氰酸酯的三元共聚

二氧化碳和环氧丙烷(PO)在阴离子配位催化剂,如二乙基锌和等摩尔的水作用下,可接式(1)发生共聚。但产物聚丙撑碳酸酯(PPC)的热稳定性较差。改进途径之一是在反应中引入甲苯二异氰酸酯(TDI)进行三元共聚。本文报导在双金属阴离子配位催化剂PBM存在下合成一种热稳定性优于PPC的聚碳酸酯聚氨酯(PCPU)的研究结果(式2)。     

Nd—Al双金属活性体的组成及其对共轭双烯烃的聚合

稀土Ziegler-Natta催化剂活性体对双烯烃配位聚合的研究已有很多报道。作者曾从NdCl_3·3P_(350)~(**)-Al(i-Bu)_3体系分离出Nd-Al双金属活性体。本文从NdCl_3·3P_(350)-HAl(i-Bu)_2和Al(C_2H_5)_3反应体系中分离出一系列Nd-Al双金属活性体,用元素分析方法研究了这些活性体的组成,并综合考察了在无助催化剂AlR_3存在下从不同烷基铝获得的活性体本身对共轭双烯烃的定向聚合能力。 单体、溶剂、HAl(i-Bu)_2、Al(C_2H_5)_5及活性体的合成,聚合方法,聚合物表征均按文献[4]。