分散法制备的CuCl/MCM-41上C3H6选择催化还原NO反应的研究

研究了由分散法制备的两种CuCl/MCM-41催化剂上丙烯在过量氧存在下选择催化还原NO反应, 发现所制备的CuCl/AlMCM-41催化剂的反应活性明显高于CuCl/SiMCM-41. XRD, IR, TPR及ESR的研究结果表明, CuCl/AlMCM-41催化剂上的主要活性中心是与骨架铝配位的铜离子(Cu2+/Cu+).     

柴油机烟碳的微波加热燃烧Ⅲ.铜催化剂的影响

柴油机烟碳的微波加热燃烧Ⅲ．铜催化剂的影响吕晓慧马建新李平朱兵刘士宁（华东理工大学工业催化研究所，上海２００２３７）方明刘毅庭（香港科技大学研究中心）关键词柴油机烟碳，微波加热，催化燃烧，铜催化剂作者在前文［１，２］研究了柴油机烟碳的微波加热燃...     

硝酮1,3-偶极环加成对映选择性配合物催化剂的研究进展

近几年来，1，3-偶极环加成的对映选择性金属配合物催化反应得到了较多研究。人们研制出了一系列控制反应立体选择性的金属配合物催化剂，尤其是对硝酮和链烯烃反应，许多催化剂对Dies-Alder反应和1，3-偶极环加成反应同时具有较高的对映及非对映选择性。     

Thermoregulated Liquid/Liquid Biphasic Catalysis and Its Application

A brief overview of our recent research results of thermoregulated liquid/liquid biphasic catalysis is presented. Emphasis is given to the general principles of thermoregulated phase-transfer catalysis (TRPTC) and thermoregulated phase-separable catalysis (TPSC). In addition, the applications of TRPTC and TPSC in biphasic catalysis are also discussed. The introduction of TRPTC to biphasic system is free from the shortcomings of classical aqueous/organic two-phase catalysis, in which the application scope is restrained by the water solubility of the substrate. Meanwhile, TPSC provides a very simple and reliable way to deal with the separation of catalyst in homogeneous catalysis. The common advantages of TRPTC and TPSC are characterized by homogeneous catalysis coupled with convenient biphasic separation.     

Effect of water in the precursor solution on the catalytic property of LaMnAl11O19 high temperature combustion catalyst

Manganese-substituted lanthanum hexaaluminates were prepared by the sol-gel method. The effect of water content on the catalyst preparation was examined. Large water content caused a rapid decrease in the surface area. When the R (R is the mole ratio of H₂O/ Al(OC₃H₇)₃) is equal to 1.5, the catalyst retains a specific surface area of 13.5 m² g⁻¹ and shows higher activity in CH₄ combustion.     

Catalytic Oxidation of Dimethyl Ether to Dimethoxymethane over Cs Modified HaPW12O40/SiO2 Catalysts

The attractive utilization route for one-step catalytic oxidation of dimethyl ether to dimethoxymethane was successfully carried out over the H3PW12O40（40%）/SiO2 catalyst, modified by Cs, K, Ni, and V. The Cs modification of H3PW12O40（40%）/SiO2 gave the most promising result of 20% dimethyl ether conversion and 34.8% dimethoxymethane selectivity. Dimethoxymethane could be synthe- sized via methoxy groups decomposed from dimethyl ether through the synergistic effect between the acid sites and the redox sites of Cs modified H3PW12O40（40%）/SiO2.     

煤油共处理油品的族组成研究

采用高效液相色谱法对兖州烟煤与催化裂化油浆共处理制备的油品的族组成进行了研究。结果表明 ,在实验条件下油品主要由烷烃和芳烃组成 ,杂原子化合物含量一般仅为 0 5 %～ 2 0 %。原料煤与油浆比例、反应温度、催化剂对油品族组成具有重要影响 ;随初始氢压不同 ,对油品族组成的影响不同 ;在 4MPa初始压力条件下 ,反应气氛 (氢气、氮气 )对煤油共处理和纯油浆制备油品的族组成影响不大。     

催化不对称Michalel加成反应的新进展

总结了近年催化不对称Michael加成反应的新方法，包括手性金属络合物催化 的反应，呈手性Lewis酸性的手性金属络合物促进的不对称加成，手性冠醚络合物 催化的反应及其它催化反应。     

Ni-B和Ni-Ce-B超细非晶态合金的退火晶化及其催化性能

 采用XAFS,XRD和DTA方法研究了Ni－B和Ni－Ce－B超细非晶态合金在退火过程中的结构变化及其结构与催化性能的关系．活性结果表明,在退火温度为623K时,Ni－B和Ni－Ce－B样品的苯加氢催化反应转化率最高,分别为63％和81％,0．3％Ce的掺入提高了Ni－Ce－B的催化活性．DTA结果表明,Ni－B超细非晶态合金在598和653K有两个晶化峰,而Ni－Ce－B样品有548,603,696和801K四个晶化峰．XAFS和XRD结果进一步说明,在573K退火时,Ni－B样品晶化生成晶态Ni3B和纳米晶Ni,此时Ni－Ce－B仅有少量晶态Ni3B生成．在673K退火时,Ni－B样品中的Ni3B开始分解生成晶态Ni,同时纳米晶Ni聚集并形成大颗粒晶态Ni,而Ni－Ce－B样品晶化生成晶态Ni3B和纳米晶Ni．在773K和更高的温度退火处理后,Ni－B样品中Ni的局域环境结构与金属Ni箔基本一致,但Ni－Ce－B样品晶化生成的Ni晶格有较大畸变,同时Ni3B并未分解．说明0．3％的Ce对提高Ni－Ce－B样品的稳定性有显著作用．本文首次报道了Ni－B和Ni－Ce－B超细非晶态合金中苯加氢催化活性中心为纳米晶Ni和类似于金属Ni的Ni－B非晶态合金．     

Selective hydrogenations of steroids catalyzed by heterogenized Ru complexes

Summary [RuCl₂(PPh₃)₃], [{RuCl₂(TPPMS)₂}₂] and their heterogenized analogs were applied in the selective hydrogenation of 17-keto- and α,β-unsaturated ketosteroids. In basic conditions these complexes selectively hydrogenated the C=O bonds, similarly to the results obtained in the case of α,β-unsaturated aldehydes. A new method was developed for the synthesis of an expensive steroid alcohol, which can be prepared traditionally in a more complicated way.