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...     

电化学合成聚苯胺粉末电极的电化学行为研究

我们曾用慢速动电位扫描法研究化学合成聚苯胺粉末的电化学行为.本文对恒电位电解合成聚苯胺粉末进行了研究.用这种方法制备的粉末由于合成溶液中不含氧化剂因而纯度高.本文还报导了这种聚苯胺粉末电极的交流阻抗测量结果.交流阻抗法曾用于聚苯胺膜的电导和化学合成聚吡咯的电阻测定. 所用盐酸、氟硼酸、硅氟酸、苯胺均为分析纯;苯胺经常压蒸馏提纯;硫酸为超纯;磷酸为分析纯;高氯酸为优级纯.溶液皆用两次蒸馏水配制.     

Parametric study of catalytic reforming process?

Summary A parametric study of catalytic reforming process in a pilot plant was carried out by varying the pressure, H₂/HC ratio, and space velocity. The results show that lower aromatics and higher hydrogen yields can be accomplished by increasing the space velocity in existing reformers, which will also result in better C₅⁺yield.     

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。     

ZrO2在Cu-ZnO-ZrO2甲醇水蒸汽重整制氢催化剂中的作用

通过对一系列Cu-ZnO-ZrO2甲醇水蒸汽重整(SRM)催化剂的XRD、TEM和BET表征及催化性能测定,研究催化剂中ZrO2对催化剂粒径、比表面以及对SRM反应性能的影响.结果表明,ZrO2的加入,使催化剂的粒径从15 nm降至10 nm（其中CuO和ZnO的平均粒径分别从7.7和10.4 nm降至3.9和8.7 nm）,BET比表面从60 m2•g－1增至78 m2•g－1.随着催化剂含ZrO2量不同,甲醇的转化率和H2、CO2的选择性均产生变化,当催化剂中Zr含量为24.0％(w),反应温度为220 ℃,水、醇摩尔比为1.3时,甲醇的转化率达到51.6％, H2和CO2的选择性达到100％(CO和CH4在产物气体中的体积分数小于10－4),这一结果对甲醇燃料电池甲醇重整器的应用具有重要的意义.     

Characterization and electrochemical investigation of boron-doped mesocarbon microbead anode materials for lithium ion batteries

The structure and anodic performance of boron-doped and undoped mesocarbon microbeads (MCMBs) have been comparatively studied and the results obtained by XPS, XRD, SEM, Raman spectroscopy and electrochemical measurements are discussed. It is found that boron doping introduces a depressed d ₀₀₂ spacing and the larger amount of "unorganized carbon", which induces vacancy formation in the graphite planes and leads to a quite different morphology from that of the undoped material. Electrochemical charge/discharge cycle tests indicated that after boron doping the lithium intercalation was carried through at a somewhat higher potential, being attended by greater irreversible capacity loss. Electronic Publication     

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.     

Silicomolybdate‐Doped PEDOT Modified Electrode: Electrocatalytic Reduction of Bromate and Oxidation of Ascorbic Acid

Electrically conducting poly(3,4‐ethylenedioxythiophene) (PEDOT) film doped with silicomolybdate (SiMo₁₂O₄₀^4? or SiMo₁₂) was synthesized by electrochemical polymerization. The synthesized film is capable of fast charge propagation during redox reactions in strong acid medium 0.2 M H₂SO₄ solution. The modified electrode was used towards reduction of bromate and successfully employed as an amperometric sensor for bromate and also above modified electrode was investigated for ascorbic acid oxidation.     

Novel electrochemical synthesis and characterisation of poly(methyl vinylsilane) and its co-polymers

The electrochemical synthesis and characterisation of poly(methyl vinylsilane) and a series of poly(methyl vinylsilane-co-metallocenes) network polymers are described in detail. This class of polymers are not accessible through Wurtz coupling reaction and are however prepared by electro-reduction of dichloro methyl vinylsilane in a non-aqueous system using aluminum electrodes in a single compartment cell. These polymers have been characterised using UV, FTIR, XRD, SEM and NMR spectral techniques. Cyclic voltammetric studies of the above polymers reveal their conducting behavior. These polymers show optical properties as explained from the results. Polymers of this type are proposed as potential soluble precursors for SiC and metal doped SiC materials.