干凝胶法合成复合孔分子筛的研究

以含有模板剂的介孔氧化硅原粉（HMS）作为原料,通过浸溃法引入微孔沸石合成导向剂,再利用有机模板剂作为介孔产生的模板,通过干凝胶转换方法将介孔材料孔壁晶化得到微孔一介孔复合孔分子筛．采用X射线衍射（XRD）、红外光谱（IR）法对样品的结晶度进行了表征,采用氮气吸附等温线测定了样品比表面积和孔分布．结果表明：全硅HMS介孔分子筛在180℃经过6h水蒸汽加热转化后,无定形介孔氧化硅转化为微孔沸石,结晶度达到80％,比表面和孔体积分别为595m^2·g^-1和0．65cm^3·g^-1．而含铝HMS介孔分子筛,因铝的引入阻碍了沸石的转化．当HMS分子筛Si／Al比达到25时,在180℃经过6h水蒸汽加热,所得样品（MZ25．6）孔壁仍为无定型结构．     

低成本ZSM-5型沸石分子筛的合成及其吸附性能

以廉价的工业废弃物粉煤灰作为初始原料,四丙基氢氧化铵（TPAOH）为模板剂,分别采用两种合成方案制备出微孔分子筛ZSM-5样品。该法相较传统水热法,原料价廉易得,制备工艺简单。通过XRD、SEM、TR等手段对样品进行表征,发现两种方案均合成出了较高质量的ZSM-5,但形貌分别为薄片型和长六方体型。最后考察了其对水中Cr（Ⅵ）离子的吸附性能,结果表明合成的ZSM-5型样品对Cr（Ⅵ）离子有较好的吸附性能。     

纳米ZSM-5分子筛的液相沉积改性及其催化己烯-1芳构化反应性能

烯烃芳构化是催化裂化(FCC)汽油改质、高辛烷值燃料油的重要手段.采用预制晶种法合成了纳米ZSM-5分子筛,并采用液相沉积法制备了Ga沉积量不同的系列改性纳米ZSM-5分子筛,分别采用XRD、N2物理吸附、SEM、TEM、XPS、H2-TPR和Py-IR等表征手段对改性前后的纳米ZSM-5分子筛的形貌、织构特性和酸性等进行了表征,并采用固定床微型反应器对其催化己烯-1芳构化反应性能进行了评价,研究了Ga改性对纳米ZSM-5分子筛的物理化学性质及催化性能的影响规律.Ga液相沉积改性的ZSM-5分子筛中Ga物种主要以Ga2 O3和提供强Lewis酸性位的GaO+形式存在,由于Ga改性提高了分子筛的脱氢反应活性,己烯-1芳构化反应的芳烃选择性显著提高,以Ga沉积量适宜的Ga4.2/NZ5为催化剂时,芳烃选择性高达55.4％.     

P/ZSM-5分子筛催化乙醇制备低碳烯烃的综合性实验

为了提高学生的综合素质和创新科研能力,设计了研究型"P/ZSM-5分子筛催化乙醇制备低碳烯烃"的计算材料学综合性实验。运用巨正则蒙特卡罗(GCMC)模拟方法研究了乙醇制备低碳烯烃反应中反应物乙醇和主要产物乙烯、丙烯在不同磷负载量的ZSM-5(P/Al=0,0.5,0.7)分子筛中的吸附性质。该综合性实验的开展有助于学生熟悉实验模拟流程,掌握理论分析方法。     

丙烯催化聚合产物的X-射线衍射 Ⅱ.产物经熔体结晶形成的结构

探讨了几个反应条件制得的聚丙烯的熔体结晶形成的结构问题,表明改变聚合温度等条件,不仅产物的等规度、结晶动力学过程受影响,而且β晶的形成能力有明显差异;在现有实验条件下,乙烯共聚改性产物不形成β晶,且随结晶条件改变,2θ=21°衍射峰高不同,它反映形成聚乙烯的结晶多少不同,若共聚物中有足够的长度的聚乙烯链段的话。     

氟改性HZSM-5分子筛对均四甲苯合成的催化性能

用脉冲微反色谱装置评价了氟改性HZSM－5分子筛催化性能，并就焙烧温度，反应温度，空速，原料比等因素对偏三甲苯－甲醇烷基化制备均四甲苯反应的影响进行了讨论。     

草酸钾-过氧化氢加合物的合成及结构表征

采用溶液结晶法制备了草酸钾-过氧化氢（K2C2O4·H2O2）晶体,过氧化氢的含量接近于理论值．利用红外光谱和X-射线衍射对草酸钾-过氧化氢加合物的结构进行了表征,得到了其红外光谱和X-射线衍射谱图,并对谱图进行了简要分析．     

介孔磷酸铝分子筛的制备及性能研究

本课题是以磷酸、异丙醇铝为主要原料,合成介孔磷酸铝分子筛,并且通过合成方法的不同来研究合成工艺的优化.还通过多种物理和化学实验对其化学组成、结构、稳定性等方面进行相关研究,并进一步探讨合成原理和形成机理.     

二次孔分布对正己烷在5A分子筛颗粒上吸附扩散性能的影响

采用IGA - 100型智能重力分析仪测定在100 ～300℃,0.01 ～ 10 kPa下,5A分子筛对正己烷的吸附速率曲线,分析了不同二次孔分布的成型5A分子筛颗粒5A-1和5A-6对正己烷的吸附扩散性能.结果表明:5A-1与5A-6分子筛具有相近的微孔和中孔孔径分布;5A-6分子筛在孔径0.1～1 μm范围内拥有...     

偏高岭土水热合成高硅SAPO-5分子筛及其表征

以具有一定活性的偏高岭土兼作铝源与硅源,正磷酸作磷源,三乙醇胺和十六烷基三甲基溴化铵为复合模板剂,采用分段晶化的方法水热合成了高硅磷酸硅铝分子筛（SAPO-5）．利用X射线衍射分析（XRD）、红外光谱分析（FTIR）、扫描电镜（SEM）、^29Si,^27Al MAS NMR（固态核磁共振）、X光电能谱（XPS）,吸附氨的程序升温脱附（NH3-TPD）等手段对产物进行了表征．     

Synthesis and characterization of magnetic ZSM-5 zeolite

In order to separate ZSM-5 zeolite powders from solution easily, a series of magnetic ZSM-5 zeolites were prepared by hydrothermal synthesis with the addition of magnetic Fe3O4 panicles during the crystalline process. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, infrared （IR） spectrum, energy dispersive X-ray （EDX）, specific surface area, magnetic susceptibility and adsorption capability. It was found that the magnetic ZSM-5 zeolites had good magnetism and the magnetic susceptibility increased with the increasing amount of Fe3O4 panicles. Compared with the pure ZSM-5 zeolite, the adsorption capability of magnetic ZSM-5 zeolites was acceptable. When the magnetic zeolites were used to adsorb Pb^2＋ from solution, the magnetic zeolite powder could be conveniently separated with magnetic separation technology.     

正己烷在Cu改性ZSM-5上的芳构化反应

本文研究了正己烷在Cu改性ZSM-5上的芳构化反应。发现引入适量的Cu可提高芳构化反应的选择性和芳烃收率，考察了催化性能与酸性的关系。Cu的引入使ZSM－5沸石的L酸量增加，B酸量减少，芳构化性能增强。提出了B酸和L酸中心的协同效应对芳构化反应的促进作用。     

Rapid synthesis of ZSM-5 zeolite catalyst for amination of ethanolamine

ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5(8) Na2O: 44 EDA:Al2O3:100 SiO2:4000 H2O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on crystallinity was investigated. The pretreatment of silicate source can cut down the crystallization time. Tuning the system alkalinity and controlling crystallization time can ensure forming of pure crystal.     

Rapid synthesis of ZSM-5 zeolite catalyst for amination of ethanolamine

INTRODUCTION ZSM-5 zeolite is a typical high silica zeolitewith MFI-type structure which makes ZSM-5 zeo-lite widely useful as catalysts in petroleum andpetrochemical industry. In recent years, the appli-cation of ZSM-5 is expanding into the synthesisfields of specialty and fine chemicals (Davis, 1998),such as the preparation of ethylene amines. The ex-cellent catalytic performance of ZSM-5 was noted(Hua and Hu, 2001). In most cases, the synthesis of ZSM-5 is ach-ieved…     

正己烷在某些金属改性ZSM_5上的芳构化反应

本文对Ｎｉ，Ｃｕ，Ｚｎ三种金属改性的ＺＳＭ－５上正己烷的芳构化反应进行了探讨和比较，发现这些金属的引入在促进正己烷的芳构化性能方面既有共同点，也有某些差异，同时还研究了催化性能和酸性的关系，并就Ｂ酸和Ｌ酸中心的协同效应对芳构化的促进作用提出了看法。     

Effects of acidity and mesoporosity development in ZSM-5 on biomass-derived ethylene oligomerization for liquid fuel synthesis

The acidities of different SiO2/Al2O3 ratio ZSM-5 zeolites, CBV3024E, CBV5524G and CBV8014 were investigated with temperature-programmed desorption of ammonia and diffuse reflectance infrared Fourier transform spectroscopy, and their catalytic performances were evaluated to screen the optimal CBV8014 catalyst for ethylene oligomerization. The mesoporosity development in CBV8014 zeolite was conducted by desilication in alkaline medium. The porous characteristics, structural properties and acidic properties of parent and alkali-treated CBV8014 zeolites were studied, and their catalytic performances were evaluated, indicating that CBV8014 treated by 0.2 mol/L NaOH solution has an appropriate mesoporosity development, well preservation of catalyst acidity and crystallinity, good catalytic activity and stability, and high liquid fuel yield for ethylene oligomerization. The effect of reaction pressure on ethylene oligomerization over 0.2HZ catalyst was also investigated, and JP-8 likely hydrocarbon jet fuel was obtained by using 0.2HZ catalyst at 0.344 75 MPa with a high catalyst stability and high liquid yield.     

三种5-溴水杨醛Schiff碱及其配合物的合成、结构表征和发光性质

合成了5-溴水杨醛缩邻氨基酚（H2 Brsaph）、5-溴水杨醛缩2-氨基噻唑（HBrsatz）和5-溴水杨醛缩2-氨甲基吡啶（HBrsapy）三种水杨醛类 Schiff碱,制备了配合物[Zn（Brsaph）（H2 O）2]（1）、[Cu（Brsatz）2]4H2 O（2）和[Cd（Brsapy）2]（3）．利用元素分析、摩尔电导、红外光谱、紫外光谱和荧光光谱进行了表征．荧光分析结果表明这些化合物在350-450 nm 光激发下在450-550 nm 范围都具有荧光,但金属离子对它们的发光行为影响不同．利用 X-射线单晶衍射仪分析了 H2 Brsaph的晶体结构,该晶体属单斜 P21空间群,晶胞参数：α＝4．6517（2）A,b＝19．0710（8）A,c＝6．2382（3）A,β＝90．402（4）°,Z＝2,V＝553．40（5）A3,Dc＝1．753 g/cm3,Mr＝292．13,R1＝0．0225,wR2＝0．0553．     

Structure and Dielectric Properties of Sb2O5-Doped ZrO2-SnO2-TiO2 Microwave Ceramics

The microwave frequency band is generally con-sidered in the range of 0.3—3 000 GHz. Its impor-tance is recognizable in the current growth of micro-wave communications systems which make use of thesuperior information density. Many kinds of dielectricmaterials have been developed for microwave applica-tions[1,2]. Among them, solid solution ZrO2-SnO2-TiO2(ZST) has a higher dielectric constant, a highquality factor (Q) value and a lowtemperature coeffi-cient of resonant frequency (TCF). B…     

城市土壤性质及其研究进展

结合近几十年来国内外有关城市土壤性质的研究成果,从物理特征、化学特征和生物特征三个方面进行论述,阐述了城市土壤在特殊成土过程和成土环境下表现出的独特性质,并针对当前城市土壤研究中存在的问题提出了研究展望.     

6061-T5铝合金搅拌摩擦焊接头组织和力学性能

采用搅拌摩擦焊技术对6061-T5铝合金进行焊接,分析了焊接速度对接头成形、微观结构及力学性能的影响.结果表明:随着焊接速度的增加,沉淀相固溶度下降,晶粒细化;焊接速度过大时,热输入不足,呈现原始态组织.当转速为800 r/min,焊接速度为60 mm/min时,接头成形良好,抗拉强度达到最大值.采用合适的搅拌摩擦焊工艺参数,6061-T5铝合金能实现可靠的连接.