镁修饰丝光沸石对萘异丙基化选择性的影响

2,6-二异丙基萘是制备高级聚酯材料PEN和液晶聚合物的原料.用择形催化剂丝光沸石代替传统的Friedel-Crafts催化剂,在高压釜中以萘和丙烯为原料经异丙基化反应合成了2,6-DIPN.采用浸渍法用少量镁盐修饰水汽脱铝氢型丝光沸石(SDHM),减少了SDHM外表面的强B酸中心和非择形产物的生成,从而使2,6-DIPN的择形率提高到71%.2,6-DIPN/2,7-DIPN摩尔比达到2.89,有利于2,6-DIPN的分离提纯.     

Hydrogen Production with Steam Reforming of Dimethyl Ether

Steam reforming of methanol and gasoline is actively researched and developed as hydrogen supply methods for the fuel cells of vehicles and so on. However, these materials have the problems such as the infrastructure, toxicity, difficulty of the reforming, and so forth. Dimethyl ether （DME） does not contain the poisonous substances, and is expected as a clean fuel of the next generation. DME is able to take the place of light oil and LPG, and its physical properties are similar to those of LPG. There is possibility that DME infrastructures will be settled more rapidly than those of hydrogen and methanol, because LPG infrastructures existing are able to use for DME. Then, we have been studying on steam reforming of DME for the hydrogen production.     

Reduction of Pt Usage in Fuel Cell Electrocatalysts Using Carbon Nanotubes and Non-Pt Metals

The high-priced and limited Pt constitutes a high barrier to commercialization of fuel cells. Pt is essential for the electrode catalyst of polymer electrolyte fuel cells （PEFCs）. A reduction in Pt usage is one of the key requirements for the commercialization of fuel cells for use in everyday life, because of its high price and limited availability, and the difficulty of finding suitable substitutes. Non-Pt fuel cell catalysts will decrease the demand for Pt by PEFCs, enabling more Pt to be available for use in other essential products, and make fuel cells more popular. The cheaper Mo2C is known to possess similar catalytic activities and electronic structures to Pt. Carbon black （CB） is widely used as the support for Pt nanoparticles. However,     

Polymer Photovoltaic Cells

Polymer photovoltaic cells （PPVCs） have attracted much attention recently because of its easy fabrication, low cost and possibility to make flexible devices. PPVC is composed of a conjugated polymer/C60 blend layer （photosensitive layer） sandwiched between a transparent ITO electrode and a metal electrode. When a light through ITO electrode irradiates on the photosensitive layer, the photons with appropriate energy will be absorbed by the conjugated polymer （CP） and excitons （electron-hole pair） are produced. The excitons move to the interface of CP/60 where the electrons transfer to the LUMO of C60 and holes leave on the HOMO of the CP. The separated electrons migrate through the C60 network to and are collected by the metal electrode, and the holes migrate through the CP network to and are collected by the ITO electrode, so that the photocurrent and photovoltage are attained.     

平面双核酞菁钴修饰电极的制备及催化性能研究

用电化学生长法将平面双核酞菁钴(bi-CoPc)修饰到玻碳电极(GC)的表面,制成化学修饰电极,用循环伏安法对该电极的电化学行为进行了研究.结果表明:化学修饰电极对溶液中的O2具有很好的电催化活性,当pH＜3时,可以经过两步四电子催化将O2还原成H2O;在碱性溶液中对巯基乙醇(2-ME)亦具有很好的电催化活性.     

不锈钢电化学诱导退火过程中的氢及其扩散系数测定

文中用排油集气法确定了EIA相变中氢扩散的存在,用显微硬度分布法按一维非稳态扩散模型计算出在80℃下的EIA处理中氢的扩散系数D=0.43×10_-13m²s^-1。该结果与理论推测的相符,也与用其他方法测得的充氢的扩散系数一致,表明该方法可以用于EIA处理的氢扩散系数测定。     

乙酰胆碱酯酶电极反应机理

在研究酶电极基础上探讨了电极上的反应机理。以乙酰胆碱酯酶催化活性为基础的抑制型酶电极的电极反应是:1)催化底物水解;2)底物中的I-被氧化为I2;3)底物氯化硫代乙酰胆碱分解产生的硫代胆碱含有的-SH基在银基汞膜电极上与汞生成硫醇汞盐。硫代胆碱在玻碳电极表面的氧化,为具有吸附性的不可逆过程,电极反应的电子转移数n=2,反应速率常数k=0.29s-1。     

Mo2C@W2C@C的制备及其电催化性能影响因素研究

传统的贵金属催化剂因资源有限和价格昂贵问题限制其电解水产氢在实际生产生活中的应用,因此开发高效低成本的电催化剂是实现电解水大规模化应用的关键.非贵过渡金属不仅地球含量丰富、价格低廉,而且由于这类金属的碳化物形式具有类铂的电子结构从而对电解水析氢反应具有良好的催化性能.本文围绕钼和钨两种热稳定性良好、酸碱稳定性优异的过渡...     

二维材料MXene的制备及其在光催化产氢领域的研究进展

MXene是一种类石墨烯结构的新型二维材料,由MAX材料刻蚀掉A层后得到手风琴状MXene,然后经过插层步骤可以得到少层或单层的MXene薄片.MXene具有良好的物理化学性质,如高导电性、高比表面积、活性位点多和独特的形貌及结构,使其在储能、电池、超级电容器和光催化方面具有良好的发展前景.本文中列举新型二维材料MXene的几种主要制备方法,阐述MXene在光催化产氢领域展现出来的优异性能,并对其发展前景做出一定的展望.     

乳山金矿床的成因机制——成矿流体和H,O,Sr同位素证据

乳山金矿床位于胶东昆嵛山复式花岗岩体的黑云母二长花岗岩中,属石英脉型,其中Ⅱ号矿体是我国迄今为止所发现的最大一条单脉型矿体。根据各种脉体之间的相互穿插关系,可将成矿作用大致划分为3个阶段:第Ⅰ阶段为矿前期梳状乳白色石英脉;第Ⅱ阶段为成矿期多金属硫化物和菱铁矿石英脉;第Ⅲ阶段为矿后期杂色隐晶质石英脉.有些学者认为乳山金矿床是由花岗岩岩浆期后中温热液作用形成的。本文研究表明该矿床属大气降水成因。