沸石补强硅酮建筑密封胶的应用研究

详述了用沸石和焙烧沸石作为补强剂用于制备硅酮建筑密封胶的工艺过程,分析了粉体用量对密封胶热稳定性、拉伸强度、断裂伸长率、干燥时间的影响;用扫描电镜（SEM）、X射线衍射（XRD）、氮气吸附—脱附等温测试（BET）和脱附孔径测试（BJH）方法对沸石和焙烧沸石的微观形貌、物相、比表面积、孔容和孔径进行了表征;研究结果表明它们是一种具有多孔结构的铝硅酸盐矿物,主要成分KNa2Ca2(Si29Al7)O72和K(Si3Al)O8,孔径分别为10nm和14nm,孔体积0.4655cc/g和0.5871cc/g,比表面积153.6m2/g和191.4m2/g,孔径分布宽、孔体积和比表面积大有利于补强,焙烧沸石的补强性优于沸石,揭示了它们的补强作用是硅烷偶联剂表面改性、孔道效应和锚固效应共同作用的结果。     

沸石补强硅酮建筑密封胶的应用

考察了用沸石和焙烧沸石作为补强剂用于制备硅酮建筑密封胶的工艺过程,分析了粉体用量对密封胶热稳定性、拉伸强度、断裂伸长率、干燥时间的影响;用扫描电镜(SEM)、X射线衍射(XRD)、氮气吸-脱附等温测试(BET)和脱附孔径测试(BJH)方法对沸石和焙烧沸石的微观形貌、物相、比表面积、孔容和孔径进行了表征;研究结果表明,它们是一种具有多孔结构的铝硅酸盐矿物,主要成分分别为KNa2Ca2(Si29Al7)O72和K(Si3Al)O8,孔径分别为10.68 nm和14.02 nm,孔体积分别为0.465 5 mL/g和0.587 1 mL/g,比表面积分别为153.6 m2/g和191.4 m2/g,孔径分布宽、孔体积和比表面积大有利于补强,焙烧沸石的补强性优于沸石,揭示了它们的补强作用是硅烷偶联剂表面改性、孔道效应和锚固效应共同作用的结果。     

多孔硅酮建筑密封胶的制备与机理研究

研究了多孔功能材料、表面改性剂种类和用量等对密封胶性能的影响。使用扫描电镜（SEM）、X射线衍射（XRD）、氮气吸附-脱附等温测试（BET）和脱附孔径测试（BJH）等对多孔功能材料的形貌、物相、比表面积、孔体积和孔径进行了表征。结果表明,多孔材料比表面积和孔体积均增大,平均孔径减小,有利于拉伸模量的提高。     

介孔材料低温氮气吸脱附的孔道网络模型

介孔结构的表征和分析对于介孔材料的开发至关重要,其中低温氮气吸脱附法是最常用的介孔表征方法之一。然而,目前氮气吸脱附法采用的分析模型仍基于平行孔假设,无法描述脱附过程堵孔现象,以及获取孔道连通性等重要孔结构信息。本文建立了低温氮气吸脱附的孔道网络模型,用于分析介孔结构对氮气等温吸脱附行为的影响。通过对比氧化铝材料的氮气吸脱附实验数据和模拟结果,证实了建立的孔道网络模型能很好地描述介孔材料中低温氮气吸脱附行为。模拟结果表明平均孔径较小时,毛细凝聚分压低,液氮堵孔效应显著,氮气吸脱附曲线回滞环的范围和面积较大;孔径分布较宽时,小孔和大孔数量均较多,毛细凝聚和堵孔效应显著,回滞环面积较大;孔道连通性不会影响吸附过程,但会通过改变堵孔效应显著影响脱附过程,连通性越差,堵孔效应越强。证实了堵孔效应对氮气脱附过程影响显著,因而氮气吸脱附法需要考虑堵孔效应,建立的孔道网络模型也可为介孔结构分析提供合理的模型工具。     

流纹质浮岩合成沸石分子篩

一、天然沸石概述 沸石系含水的钾、钠、钙、镁等的格架状铝硅酸盐矿物。其一般化学式为:A_m XpO_2p·nH_2O。式中A为钙、钠、钾、钡、锶;X为硅、铝。沸石灼烧时,晶体内的水分被赶出,产生类似起泡沸腾的现象,因而称为沸石或泡沸石。沸石的晶体结构特点:硅(铝)氧四面体是组成沸石结构的基本单元;硅(铝)氧四面体通过公用顶点彼此连接构成各种形式的格架;在格架中有许多孔道和孔穴,通常水分子充填     

以杨木为模板制备高度有序的多级复合孔材料

以天然植物杨木作为大孔硬模板,以嵌段共聚物P123作为介孔相软模板成功制备出一种具有连续的骨架和相互贯通的大孔孔道,其大孔孔径约为10μm,其孔壁为介孔相的高度有序多级复合孔材料。并用扫描电子显微镜（SEM）、粉末X射线衍射仪（X R D）、高分辨率透射电镜（H R TEM）、N2吸附-脱附等测试手段对样品进行了系统的...     

用多孔材料制备单组分室温固化建筑密封胶

采用表面改性剂对多孔材料硅藻土进行改性,并以此作为单组分室温固化硅酮建筑密封胶的补强剂,研究了改性硅藻土多孔功能材料和表面改性剂用量、反应温度等工艺参数对密封胶性能的影响,通过扫描电镜(SEM)、X射线衍射(XRD)、氮气吸附-脱附等温测试(BET)和脱附孔径测试(BJH)等分析手段对多孔功能材料的形貌、物相、比表面积、孔体积和孔径等进行了表征。结果表明:当w(表面改性剂)=(2.5±0.5)%(相对于粉体质量而言)、w(粉体)=20%～30%(相对于总量而言)和反应温度为100～120℃时,改性硅藻土多孔材料的比表面积和孔体积较大、平均孔径较小,有利于密封胶力学性能的提高。     

沸石分子筛的磷改性方法研究及应用

沸石在工业上得到广泛的应用 ,主要是由于这类矿物晶体具有很开旷的硅氧格架 ,在晶体内部形成许多孔径均匀的孔道和内表面很大的孔穴 ,从而具有独特的吸附 ,筛分 ,阳离子交换和催化性能。对于沸石改性的研究和应用的报道很多。“改性沸石”包括的范围很广 ,从简单的离子交换到结构完全崩塌的材料都属于改性范围。改性沸石包括三大类 :一是结构改性 ,即改变沸石的SiO2 /M2 O2 (M =AL或Fe、B、Ca等 ) ,从而达到改变沸石酸性的目的 ,水热脱AL是这类改性沸石的典型方法 ;二是沸石晶体改性 ,如加入不能进入沸石孔道的大分子金属有机化合物达…     

一种高硅超稳化天然辉沸石及其制备方法（CN1724363A）

以天然STI沸石为原料，经脱铝补硅改性方法，如酸交换，铵交换再焙烧，氟硅酸铵交换再焙烧等，得到高硅天然STI沸石（Si／Al〉7．0），其孔道结构开放完美。结构热稳定性达到1000℃以上。本发明所用天然矿物资源品位高、储量丰富、开采成本低。制备方法简便，产业化时投资少，生产成本较低。     

Fe2O3/改性沸石催化剂的制备及其催化臭氧氧化对氯苯酚

为了提高非均相催化臭氧氧化体系处理难降解有机废水的效率,分别以十六烷基三甲基溴化铵（CTMAB）改性的天然沸石和Fe(NO₃)₃·9H₂O溶液作为载体和活性组分前体,采用浸渍法制备Fe₂O₃/改性天然沸石催化剂（MNZ）,利用能谱仪（EDS）、扫描电镜（SEM）、傅里叶变换红外光谱仪（FTIR）、X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、N₂-吸附/脱附等方法分析催化剂的结构和组成,研究其催化臭氧氧化对氯苯酚的效果和催化机制。结果表明：Fe₂O₃/MNZ催化剂保持了天然沸石的表面结构。Fe₂O₃均匀负载在沸石表面,属于典型的分子筛结构,比表面积、孔容和孔径分别为12.776m²/g、0.042cm³/g和3.932nm。在对氯苯酚初始浓度为100mg/L、臭氧浓度为2.6mg/L、温度为25℃、pH为7.0±0.2的条件下,对氯苯酚和化学需氧量（COD）去除率分别为87.26%和48.83%。天然沸石与Fe₂O₃共同促进臭氧分解生成强氧化能力的羟基自由基（·OH）,提高了对氯苯酚的去除率,反应体系遵循羟基自由基作用机理。     

多孔质沸石颗粒对矿井水中Pb2+、Cu2+、Zn2+吸附性能的研究

将天然沸石进行处理制备出多孔质沸石颗粒。在静态条件下，研究了多孔质沸石颗粒对重金属离子Pb^2 、Cu^2 、Zn^2 的吸附效果及吸附条件。含Pb^2 、Cu^2 、Zn^2 的矿井水经多孔质沸石颗粒吸附后，废水中Pb^2 、Cu^2 、Zn^2 的含量显著低于国家排放标准。     

动态水热法制备Silicalite-1分子筛膜包覆多孔缺陷Al2O3微球

采用晶种涂覆-预晶化-晶化成膜的动态水热法成功在具有多孔缺陷的氧化铝微球上合成Silicalite-1分子筛膜。以乙醇作为润湿试剂在氧化铝表面涂覆一层晶种,将涂覆过晶种的载体加入到分子筛合成液中预晶化,一层分子筛完全覆盖载体并与载体结合牢固。预晶化后的载体在动态水热条件下处理3天,得到致密分子筛膜包覆的Al₂O₃微球。运用X射线衍射（XRD）和扫描电镜（SEM）对所得材料进行表征。结果表明,包覆的分子筛膜具有典型的MFI结构,晶粒交互生长,厚度约为3μm。考察了TPAOH用量和水量对分子筛膜微观结构的影响,结果发现TPAOH用量主要影响Silicalite-1分子筛膜的形貌,当TPAOH用量为0.17时,合成的Silicalite-1分子筛膜连续致密,而水量对分子筛膜微观结构的影响较小。这种晶种涂覆-预晶化-晶化成膜的方法有助于在多孔缺陷的Al₂O₃微球上制备高质量的分子筛膜。     

Preparation and characterization of poly(vinylidene fluoride)-13X zeolite mixed matrix membranes for lithium ion batteries' separator with enhanced performance

13X zeolite was hydrothermally synthesized and poly(vinylidene fluoride) (PVDF)/13X zeolite particles mixed matrix membranes were prepared using phase inversion method as the lithium-ion battery separator. Hydrophilic and porous 13X zeolite loading impacts on the critical separator properties of morphology, wettability, electrolyte uptake, and high temperatures dimensional stability were investigated using scanning electron microscopy, contact angle, and thermal shrinkage analysis. Electrolyte uptake of the 13X zeolite particles loaded PVDF separators increased and also the incorporation facilitated the lithium ions migration (ion conductivity) due to the Lewis acidity of their structure. The 8 wt% 13X zeolite loaded separator (S2) revealed higher porosity (~+20%), electrolyte uptake (+80%), ion conductivity (+80%), and thermal shrinkage (~−47% at 165°C). C-rate capability and cycle performance of a cell battery assembled using the S2 separator considerably improved compared with those of the assembled by the neat PVDF and commercial polypropylene separators.     

Modification of carbon membranes and preparation of carbon-zeolite composite membranes with zeolite growth

A novel method for the modification of carbon membranes was developed by zeolite growth on the surface of porous carbon tubes using a hydrothermal synthesis method and carbon-zeolite composite membranes were successfully obtained. Zeolite seeds for the zeolite growth were introduced to the inner surface of the tubes by using a slip-casting technique in 1 wt.% seed ethanol solution and continuous and highly intergrown zeolite layers on the seeded tubes were formed by subsequent hydrothermal synthesis. Different types of zeolite layers can be grown on porous carbon tubes by using different types of zeolite seeds. Without zeolite seeds, a zeolite layer could not be formed on the carbon surface. SEM, XRD and pure gas permeation characterization indicates that the carbon-zeolite membranes are continuous and defect-free.     

Synthesis of hexagonal aluminosilicate from liquid-crystalline mesophase using zeolitic nanoclusters: bottom-up versus top-down approach

An amorphous porous hexagonal aluminosilicate Al-ZAT was prepared using liquid crystal phase of Brij-56 and preformed MFI zeolite nanoclusters solution through bottom-up approach. The HCl concentration (0.5–2.0 M), HCl to Brij-56 ratio and zeolitic seed solution wss varied for the mesoporous system at ambient synthesis condition. The optimum Brij-56 to HCl ratio was found to be 1 Brij 56: 9–19 HCl (0.5 M) by mass. The addition of preformed zeolite seed (7–14 ml) as precursor solution instead of conventional silica source tetramethyl orthosilicate (TMOS) generate uniform mesophase and subsequently avoids formation of methanol (from TMOS hydrolysis) that affects liquid crystalline mesophase. MCM-41 (ZMCM-41) and SBA-15 (ZSBA-15) derived from similar zeolite precursor solution was synthesized for comparative study. The porous textural characteristics, and type of surface acidity were studied. The analysis showed a highly porous hexagonal structure of Al-ZAT. ZMCM-41 prepared through top-down approach, showed formation of ordered nanostructured mesoporous (disordered hexagonal). Al-ZAT and ZSBA-15 shows weaker Brønsted acid sites compared to ZMCM-41.     

Synthesis and characterization of microporous carbons templated by ammonium-form zeolite Y

Emerging applications such as gas storage require porous carbon materials with tailored structural and surface properties. Template synthesis approach to porous carbons offers opportunities for tailoring these properties. In this study, ammonium-form zeolite Y (NH₄Y) was used as a template and furfuryl alcohol (FA) was employed as a carbon precursor to prepare microporous carbons by simple impregnation method. The effects of synthesis conditions such as carbonization temperatures and heating rates on the pore structure of the microporous carbons were investigated. The thermal behaviors of FA-NH₄Y mixtures and zeolite/carbon composites were studied by thermogravimetric analysis (TGA). The physical, structural, and surface properties of the microporous carbons were characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM), elemental analysis, and physical adsorption of nitrogen. Microporous carbons with high surface areas, pore volumes and nitrogen-containing surface functional groups can be readily synthesized.     

Grand canonical Monte Carlo simulation and volumetric equilibrium studies for adsorption of nitrogen, oxygen, and argon in cadmium (II) exchanged zeolite A

The adsorption of nitrogen, oxygen and argon has been studied in cadmium (II) ions exchanged zeolite A at 288.0 and 303.0?K. Experimentally measured adsorption isotherms are compared with theoretically calculated data using grand canonical Monte Carlo (GCMC) simulation. Nitrogen showed higher adsorption capacity and selectivity than oxygen and argon in these zeolite samples. The cadmium exchanged zeolite A showed increased adsorption capacity for nitrogen, oxygen, and argon with increase in cadmium (II) exchange levels. Isosteric heat of adsorption data showed stronger interactions of nitrogen molecules with cadmium (II) cations in zeolite samples. These observations have been explained in terms of higher electrostatic interaction of nitrogen with extra framework zeolite cations. The selectivity of oxygen over argon is explained in terms of its higher interaction of oxygen with cadmium exchanged zeolites than argon molecules. Heats of adsorption and adsorption isotherms were also calculated using grand canonical Monte Carlo simulation algorithm. Simulation studies expectedly show the proximity of nitrogen molecules to the locations of extra framework sodium and cadmium cations.     

SYNTHESIS OF WELL-CRYSTALLIZED ZEOLITE BETA AT LARGE SCALE AND ITS INCORPORATION INTO POLYSULFONE MATRIX FOR GAS SEPARATION

Using a silica source with high specific surface area, aluminum zeolite beta was successfully synthesized in a very short crystallization period through the conventional hydrothermal route. The obtained materials were characterized by means of XRD, TEM, FESEM, EDS, TGA/DTG, and N₂ adsorption/desorption techniques. It is found that the well-crystallized zeolite beta can be rapidly synthesized at 170°C in 9 h and the highly porous silica source used could be completely converted into zeolite beta. No difference results from the silica source used. Moreover, through this synthesis route, it is also possible to conveniently obtain zeolite beta at high yield for manufacturing composite membranes for gas separations. The gas permeation tests show that the incorporation of porous zeolite beta into a polymer has modified the gas permeation properties significantly, indicating industrial application potential of this new type of composite material.