减压蜡油缓和加氢裂化催化剂酸性研究

用热重原位氨吸附－程序升温脱附及氨吸附－差热法考察了含分子筛缓和加氢裂化催化剂的载体、活性金属组分及催化剂本身的酸性。发现载体的总酸量是其分子筛含量的线性函数。载体担载上Ｎｉ、Ｗ活性组分后，可不同程度的引起催化剂的酸性变化。催化剂中分子筛含量增加除提高其加氢裂化活性外，还可增加它的ＶＧＯ加氢脱氮及加氢脱芳烃的活性，但会引起中馏份选择性的下降。催化剂的酸性可通过载体的分子筛含量、类型及分子筛改性加以调节。     

HY沸石上2,6-二叔丁基萘的择形合成

 研究了脱铝HY沸石（n（Si）／n（Al）＝3．8）上萘（naph）的\r\n选择性叔丁基化反应．结果表明，八面沸石对该反应过程有较好的择形\r\n催化作用，两种异构化产物（2，6－二叔丁基萘和2，7－二叔丁基萘）\r\n之间存在着热力学平衡，即两种异构化产物可在酸性中心位上相互转化\r\n．在以叔丁醇为烷基化试剂，WHSV＝2h－1，n（t－BuOH）／n（naph）\r\n＝3，反应温度为120℃的反应条件下，萘的转化率可达98．43％，β－\r\n位选择性可高达100％，二叔丁基萘收率可达74．34％，2，6－二叔丁\r\n基萘／2，7－二叔丁基萘质量比为6．24．     

微孔分子筛纳米晶的控制合成及其催化应用

纳米分子筛因具有高的外表面积和短的孔道结构而显示了独特的催化活性和选择性, 近年来已成为催化界的研究热点.本文就分子筛纳米晶的控制合成、催化基础研究,特别是当前分子筛纳米晶在自组装分级多孔材料和分子筛基纳米复合材料方面的新方向进行了系统的综述,分析了纳米分子筛研究中的机会和应用前景.     

甲苯甲醇侧链烷基化反应中沸石催化剂酸碱中心的作用Ⅰ．改性的X型、X／ZSM－5型和KX型沸石催化剂

甲苯甲醇侧链烷基化反应中沸石催化剂酸碱中心的作用Ⅰ．改性的Ｘ型、Ｘ／ＺＳＭ－５型和ＫＸ型沸石催化剂李永光，畅晋英，王建平（太原工业大学化工系，太原０３００２４）关链词沸石，侧链烷基化，甲苯，甲醇甲苯甲醇烷基化反应有两种方式：在苯环上烷基化生成二甲苯；...     

Characterization and pozzolanic activity of thermally treated zeolite

Summary The pozzolanic reactivity of thermally treated zeolites was studied on the basis of the Chapelle test combined with X-ray diffraction (XRD) and Fourier Transform (FTIR) spectroscopy, as well as thermogravimetric analysis (TG/DTG) and differential thermal analysis (DTA). The raw zeolite samples are from the Pentalofos area, Thrace, NE Greece. Their main mineral constituent is 'heulandite type-II', an intermediate type of the heulandite-clinoptilolite isomorphous series. Calcination of the samples was carried out up to 400, 500, 600, 700 and 1000°C for 15 h. The changes were recorded using the above methods. The deformation of the zeolite crystal lattice starts at about 400°C and proceeds as the temperature of thermal treatment rises. The thermal treatment of zeolite at 400°C improves its pozzolanic reactivity and accelerates the reaction with Ca(OH)₂.     

HZSM－20沸石分子筛的水蒸汽改性

ＨＺＳＭ－２０沸石分子筛的水蒸汽改性项寿鹤，任大立，王敬中，李赫晅（南开大学化学系，天津３０００７１）关键词ＨＺＳＭ－２０沸石，水蒸汽处理，改性ＺＳＭ－２０沸石是一种具有大孔和开放结构的分子筛［１］，其结构与八面沸石（如Ｙ型沸石）类似，但其硅铝比较高...     

粉煤灰空心微珠沸石化制备复合空心球

采用晶种静电吸附-诱导转化技术，成功地将选自工业废弃物粉煤灰的空心微 球转化为具有沸石/莫来石双层复合球壳结构的空心球，用XRD和SEM等手段对产物 进行了表征，并对球壳的转化机理进行了讨论。     

高硅沸石骨架结构及其稳定性的模拟计算(I)*

The lattice energy of a series of high-silica zeolites was determined using the lattice energy minimization method. The results were compared to the lattice energy of dense polymorphs of SiO2. All high-silica zeolites frameworks are only 30～67kJ•mol-1 less stable than α-quartz This may imply that there is little energy barrier to the formation of high-silica zeolites frame-works and explain the structural diversity observed for high-silica zeolites. The relationships of calculated lattice energies and framework Structures was disscussed. The results revealed a good linear relationship between framework density of these molecular sieves and all-silica framework lattice energies.     

Application of an Ion Beam Technique for the Design of Visible Light-Sensitive, Highly Efficient and Highly Selective Photocatalysts: Ion-Implantation and Ionized Cluster Beam Methods

As a new concept for the design of effective photocatalysts, an ion beam technology using accelerated metal ions, a metal ion implantation and an ionized cluster beam (ICB) method, have been applied to design unique photocatalysts. The metal ion implantation of TiO₂ and Ti-containing zeolites with highly accelerated metal ions (V⁺, Cr⁺, etc.) is useful in designing photocatalysts that can operate efficiently under visible light irradiation. Also, an ICB method with a low acceleration energy is useful in preparing transparent TiO₂ thin films on various types of substrates for the efficient photocatalytic degradation of pollutants diluted in water and air. The combination of the ICB method and metal ion implantation can develop the TiO₂ thin films that are able to operate not only under UV light but also under visible light irradiation.