在（TPA）2O—Na2O—SiO2—H2O体系中MFI型硅沸石的结晶行为（Ⅱ）

以白炭黑和硅溶胶为硅源，在（ＴＰＡ）２Ｏ－Ｎａ２Ｏ－ＳｉＯ２－Ｈ２Ｏ体系６０℃下合成了高结晶度纯相硅沸石，由ＳＥＭ没得其晶粒尺寸为０．２μｍ和０．４５μｍ用ＸＲＤ线宽法是的为０．０２μｍ，一１８０℃时合成的硅沸石样品相比，低温合成的细晶粒硅沸石已上备内米级的若干特性，其正己烷吸附量反常增大；ＸＲＤ、ＦＴＩＲ、＾２９ＳｉＭＡＳ ＮＭＲ和ＴＧ／ＤＴＧ／ＤＴＡ的研究证明，其结构破坏温度和单斜／正交对称性     

硅沸石—1的合成及催化作用

产次在吸附态模板剂作用下的Ｎａ２Ｏ－ＳｉＯ２－ＥＤＡ干粉体系中合成了硅沸石－１，利用ＸＲＤ，ＳＥＭ，ＩＲ等分析方法对沸石的结构，形貌，骨架振动，稳定性及催化性能进行了表征。     

丝光沸石的疏水化研究

采用不同的脱铝方法得到Ｓｉ／Ａｌ比为１５～１１２的丝光沸石，用ＩＲ方法测定了样品的脱铝空穴含量，并考察样品的热稳定性和疏水性，实验结果表明，脱铝后形成的大量末端硅羟基仍有亲水性，因而单纯酸脱铝疏水化效果有限，用水蒸汽处理或（ＮＨ４）２ＳｉＦ６补硅的方法使沸石表面硅羟基转变成≡Ｓｉ－Ｏ－Ｓｉ≡键，能显著地提高沸石疏水性。     

在改性非水合成的丝光沸石上邻二甲苯异构化

1985年Bibby首次在非水体系中合成了纯硅方钠石,由此开创了一条合成分子筛的新途径。徐文旸等首次在Na_2O-SiO_2-Al_2O_3一有机胺非水体系中合成了丝光沸石(简称非水丝光沸石,用NAM表示)。晶化过程中液相无硅铝酸根离子,固相硅铝比始终保持不变,是典型的固相转化过程。利用非水体系这一特点,可以定向地合成出催化反应所需硅铝比的沸石。与水热体系相比,非水体系合成的丝光沸石在邻二甲苯异构化催化性能上要优于前者。     

ZSM-35沸石的合成与应用

对ＺＳＭ－３５沸石的结构、合成方法、模板剂、合成种类、催化方面的应用及合成原料进行了综合，并着重介绍了新颖的干法合成技术、纯硅ＺＳＭ－３５的合成以及ＺＳＭ－３５沸石在ＣＯ加氢直接合成低碳烯烃反应中的催化应用等内容。     

TS—1沸石的合成,结构及催化性能探讨

讨论了用两种不同硅源合成钛硅沸石ＴＳ－１的方法和合成过程中应注意的问题，并通过ＸＲＤ、ＩＲ、ＴＥＭ和ＳＳＡ等手段对沸石的结构及热稳定性进行了表征和研究，确认了钛已进入沸石骨架，初步探讨了ＴＳ－１沸石合成时ＴＰＡ离子的模板作用机理，此外，通过在温和条件下用Ｈ２Ｏ２选择性氧化正己烷的反应，考察了ＴＳ－１沸石的催化活性，得到了比较满意的结果。     

氟离子对无胺法合成高硅丝光沸石的结构导向作用

 在含氟无胺体系中合成了高硅丝光沸石，研究了合成条件对丝光沸石产物的影响．结果表明，投料n（SiO2）／n（Al2O3）＝20～200时，控制晶化条件可得到高硅丝光沸石纯相．由含氟无胺体系中丝光沸石的热力学稳定相区可见，氟离子的引入对方沸石的生成的相区无影响，ZSM－5和镁碱沸石生成的相区消失，丝光沸石生成的相区扩大，石英生成的相区缩小，且基本上变为两相共存区．合成产物丝光沸石的硅铝比随着氟硅比的升高同步增大，证明氟离子在无胺合成高硅丝光沸石时具有结构导向作用．     

Ni／丝光沸石覆盖物的特性

采用蒸气相法合成了Ｎｉ／丝光沸石覆盖物，用ＸＲＤ，ＳＥＭ，电子能谱证明了合成的材料为丝光沸石包覆于金属镍粉表面成的复合物。用二甲本异构化探针反应和ＮＨ３－ＴＰＤ考察了该包覆物的催化活性及酸性。结果表明，Ｎｉ／丝光沸石覆盖物具有良好的表面酸性，二甲苯异构化的活性均高于采用同样方法合成的Ｃｒ／丝光沸石覆盖物，间二甲苯异构化活性可以达到９７％。     

V2O5/高硅分子筛的酸性与甲苯气相选择氧化

用固体离子交换法制备了Ｖ２Ｏ５／ＺＳＭ－５和Ｖ２Ｏ５／丝光沸石两类催化剂。通过ＸＲＤ，ＬＲＳ，ＸＰＳ和Ｓｇ测定表征了Ｖ２Ｏ５在分子筛上的分散状态。用吡啶吸附红外光谱法和正丁胺非水溶液回滴法研究了催化剂的表面酸性。用ＥＳＲ研究了甲苯在催化剂上的吸附。结果表明，催化剂的酸性不同，它们吸附甲苯的能力也不同，对甲苯气相选择氧化的活性和选择性也有较大的差异。同时，甲苯选择氧化成苯甲醛的能力还与Ｖ２Ｏ５在分子     

杂原子B—ZSM—35沸石的干法合成,表征及CO＋H2反应性能的研究

首次利用吸附态模板剂在Ｎａ２Ｏ－ＳｉＯ２－Ｂ２Ｏ３－ＤＥＡ干粉体系中合成了杂原子Ｂ－ＳＺＭ－３５沸石，ＸＲＤ，ＳＥＭ，ＩＲ，及ＣＯ加氢反应研究了其物理化学特性。结果表明，Ｂ原子同晶取代Ａｌ原子进入ＺＳＭ－３５沸石骨加。     

合成钾型丝光沸石的酸改型及对K+的离子交换性

合成出钾型丝光沸石,对其进行了酸改型,测定了其对碱金属离子的饱和交换容量和分配系数、ｐＨ滴定曲线等离子交换性能,并对该沸石进行了Ｘ射红衍射分析和ＦＴ－ＩＲ分析。结果表明,该沸石对钾离子具有较强的交换选择性。     

T-81型丝光沸石催化剂烧焦动力学的研究

考察烧焦动力学行为,寻找适宜的再生条件,对再生反应器的设计是十分必要的。已有大量的文章论述了关于硅铝型及Y型分子筛催化剂上的结焦和烧焦过程的模型,由于烧焦方式与焦在催化剂酸位上的生成方式有关,因此上述众多的模型都不能直接用于描述T-81型丝光沸石的烧焦过程。本文以Hashimoto等人提出的烧焦是烧碳和烧氢的复合反应为理论基础,研究了T-81型丝光沸石催化剂的烧焦动力学,为确定最佳反应条件和再生反应器的设计提     

Preparation of mordenite composite membranes with seeding

Mordenite composite membranes were prepared by means of coating a porous α-alumina support with nanosized mordenite seeds followed by hydrothermal crystallization. A systematic investigation was performed on the influence of several factors such as ageing of the reaction mixture, alkalinity, salt addition and temperature on the formation of a mordenite membrane on the seeded support. The ageing of the reaction mixture reduces the growth rate of mordenite crystal along a-axis and b-axis but hardly influences the growth rate along c-axis. As a result, the boundaries between the surface crystals become a little larger with prolonging the period of ageing time. The growth rate of the mordenite crystal along individual axes increases first and then decreases with increasing concentration of sodium hydroxide. A higher alkalinity is unfavorable for the formation of a continuous mordenite membrane. The addition of salt in the reaction mixture has different effect on the growth rate of the mordenite crystal along each axis. With increasing the amount of salt, there was hardly influence on the growth rate along c-axis, whereas an obvious decline was observed in the growth rate along either a-axis or b-axis, which enlarges the boundaries between the surface crystals. The growth rate of the mordenite crystal increases more along c-axis than that along a-axis or b-axis with increasing temperature for hydrothermal crystallization. The use of a temperature as high as 473 K produces a membrane composed of bar-like crystals with larger boundaries. __________ Translated from Journal of Zhejiang University (Science Edition), 2005, 32(4) (in Chinese)     

Isopropylation of naphthalene over modified-mordenite zeolites

Isopropylation of naphthalene with propylene was carried out over Ce-, Si-, La-, and Mg-modified mordenite zeolites. The reaction was performed in a 500 mL batch reactor at 300°C, 8 kg/cm², and naphthalene to catalyst weight ratio of 10:1, with excess propylene. It was attempted to eliminate the external acid sites of zeolites by these modifications. The results indicate that the CVD silanation and magnesium or cerium modification with Mg/Al or Ce/Al atomic ratios less than 0.5 can improve the 2,6-DIPN selectivity of mordenites. The improvement of catalyst performance is ascribed to the selective deactivation of acid sites on the external surface of HM zeolites.     

无胺体系高硅铝比丝光沸石的合成

Mordenite has two kinds of pore channels. The main straight channels of 0.67 nm ×0.70 nm (12-membered ring) parallel to the caxis are interconnected with small side-channels of 0.29 nm×0.57 nm (8-membered ring) parallel to the baxis.     

无胺法合成高硅丝光沸石的表征

采用XRD、SEM、FT-IR、MAS NMR等表征手段, 对以氟离子为结构导向剂无胺法合成的高硅丝光沸石进行了表征. 结果表明: 高硅丝光沸石结构属立方晶系, 晶胞参数小于传统低硅丝光沸石, 但b、c值要比相近硅铝比非氟体系合成的丝光沸石样品的大; 样品形貌及粒径与其硅铝比有关, 表明晶化条件对产物形貌及粒径均有影响; 随硅铝比的增大, FT-IR光谱中450、544、1053 cm-1谱带向高频移动, 720 cm-1谱带强度减弱, 表明骨架中铝减少而硅增多; 采用含氟无胺体系合成高硅丝光沸石时基本上不会产生非骨架铝.     

丝光沸石催化剂的结焦失活研究

用ＧＣ－ＭＳ，ＨＮＭＲ和元素分析研究了结焦的钯／氢型丝光沸石催化剂上焦炭的分子性质，用ＦＴ－ＩＲ，ＴＰＤ，ＴＰＯ，微孔分析和活性评价等考察了催化剂结焦前后性质的变化。结果表明，催化剂上可溶性焦炭为二至四环的多环芳烃，它们滞留在分子筛孔内起覆盖活性中心的作用，且是进一步生成高碳氢比焦炭的前身物，结炭反应主要发生在酸中心上，随着结炭量的增加，催化剂上Ｂ中心大量减少，表面积和孔体积亦相应减小，与焦炭分子     

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

Hierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.04 mol·L⁻¹, amorphous materials are observed. These hierarchical mordenite possess a higher porous volume compared to its counterpart conventional micrometer crystals. Nitrogen sorption showed the presence of mesoporosity for all mordenite samples synthesized in the presence of CTAB. The creation of mesopores due to the presence of CTAB in the synthesis medium does not occur at the expense of zeolite micropores. In addition, mesoporous volume and BET surface seem to increase upon the increase of CTAB concentration in the synthesis medium. The Si/Al ratio of the zeolite framework can be increased from 5.5 to 9.1 by halving the aluminum content present in the synthesis gel. These synthesized hierarchical MOR-type zeolites possess an improved catalytic activity for n-hexane cracking compared to large zeolite crystals obtained in the absence of CTAB.