Synthesis of ZSM-5/SAPO-11 composite and its application in FCC gasoline hydro-upgrading catalyst

This article describes the synthesis, characterization and application of a novel aluminosilicate/silicoaluminophosphate composite zeolite ZSM-5/SAPO-11. The composite was synthesized by the in situ overgrowth of SAPO-11 on ZSM-5 and was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformed infrared (FT-IR) spectrometry, N₂ adsorption and infrared spectroscopy of adsorbed pyridine. The results were compared with those of the mechanical mixture composed of individual ZSM-5 and SAPO-11. In the mechanical mixture, the ZSM-5 phase was morphologically separate from the SAPO-11 phase, while the ZSM-5/SAPO-11 composite existed in a form of a core-shell structure, with the ZSM-5 phase as the core and the SAPO-11 phase as the shell. Compared with the mechanical mixture, the composite had more mesopores and moderate acidity distribution, which could accelerate the diffusion of substances and enhance the synergetic effect between Brönsted and Lewis acids. The comparison of the catalytic performances of the mechanical mixture and the composite-based Ni–Mo catalysts for FCC gasoline hydro-upgrading showed that, due to the above advantages of the composite, the corresponding catalyst yielded improved gasoline research octane number, high liquid yield, good desulfurization activity and lower coke amount and thus could be considered as a potential catalyst system for hydro-upgrading FCC gasoline.     

Coaxial electrospinning of PC(shell)/PU(core) composite nanofibers for textile application

To develop a novel functional composite material for textile application, a coaxial electrospinning technique was investigated to electrospin two different polymer solutions into core‐shell structured nanofibers in which polyurethane and polycarbonate were used as core and shell materials, respectively. The resultant nanofibers were subsequently characterized by means of scanning electron microscope, transmission electron microscopy, fourier transform infrared spectroscopy, and tensile mechanical test. Furthermore, water vapour transmission rate and pliability of the resulting nonwoven mats were also measured. The preliminary results indicated that it is feasible to attach composite nanofibers, with possible fictionalization on the shell material, onto a substrate fabric. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers     

Coaxial electrospinning of PC(shell)/PU(core) composite nanofibers for textile application

Functional core–shell structured composite nanofibers can be fabricated through electrospinning of two polymer solutions in a coaxial, two‐capillary spinneret system. Composite nanofibers, polycarbonate (PC, shell)/polyurethane (PU, core), have been developed by this technique. Morphological, structural, infrared spectroscopy, and mechanical performance are conducted for the developed nanofibers. Their applications as textile materials have been explored. POLYM. COMPOS. 27:381–387, 2006. © 2006 Society of Plastics Engineers     

Synthesis of MAZ/ZSM-5 composite zeolite and its catalytic performance in FCC gasoline aromatization

A novel one-pot procedure for the preparation of mazzite and ZSM-5 composite zeolite was developed. This synthesis procedure provided a convenient method for the in situ utilization of the silica source in the mazzite zeolite synthesis procedure. Mild dealumination of the composite created a secondary mesopore network. The catalytic evaluation results showed that the zinc loaded composite has a good performance in FCC gasoline aromatization reactions.     

Synthesis of composite zeolites composed of SAPO-5 and SAPO-34 and its application in methanol dehydration to light olefins

Journal of Porous Materials - In present work, bi-phases composite zeolites consisting of SAPO-5 and SAPO-34 (named as SSC) are prepared by a traditional hydrothermal way, and characterized by...     

ZSM-5/SAPO-5催化合成二芳基乙烷

对二甲苯与苯乙烯烷基化反应制二芳基乙烷反应体系进行考察。采用固定床反应器,在ZSM-5/SAPO-5复合分子筛催化剂下,研究了原料配比、反应温度、反应压力和空速对苯乙烯转化率和二芳基乙烷选择性的影响,确定了最佳工艺条件:苯乙烯与二甲苯物质的量比为1∶6,反应温度70℃,反应压力3.0 MPa,空速1.0 h~(-1),此条件下,苯乙烯转化率达100%,二芳基乙烷的选择性达80.48%。     

SAPO-34/ZSM-5复合分子筛的制备及其催化甲醇芳构化性能研究

先用水热合成法制备SAPO-34分子筛。再用机械混合法制备了SAPO-34/ZSM-5复合分子筛,借助X射线衍射(XRD)、N2吸附-脱附、扫描电镜(SEM)、NH3程序升温脱附(NH3-TPD)、傅里叶变换红外光谱(FTIR)和程序升温氧化(TPO)等手段对其进行了表征。结果表明,SAPO-34/ZSM-5复合分子筛的孔径呈介微孔结构,其比表面积、孔容、弱酸、强酸量均高于ZSM-5和SAPO-34分子筛,并且其反应稳定性优于ZSM-5分子筛。最后,将SAPO-34/ZSM-5复合分子筛用于甲醇芳构化反应,结果表明,在反应温度为460℃、反应压力0.5 MPa、空速(LHSV)1.2 h-1条件下,BTX(苯、甲苯和二甲苯)的收率可达30.5%。     

SAPO-34/ZSM-5复合分子筛的制备及其催化甲醇芳构化性能研究

先用水热合成法制备SAPO-34分子筛。再用机械混合法制备了SAPO-34/ZSM-5复合分子筛,借助X射线衍射(XRD)、N2吸附-脱附、扫描电镜(SEM)、NH3程序升温脱附(NH3-TPD)、傅里叶变换红外光谱(FTIR)和程序升温氧化(TPO)等手段对其进行了表征。结果表明,SAPO-34/ZSM-5复合分子筛的孔径呈介微孔结构,其比表面积、孔容、弱酸、强酸量均高于ZSM-5和SAPO-34分子筛,并且其反应稳定性优于ZSM-5分子筛。最后,将SAPO-34/ZSM-5复合分子筛用于甲醇芳构化反应,结果表明,在反应温度为460℃、反应压力0.5 MPa、空速(LHSV)1.2 h-1条件下,BTX(苯、甲苯和二甲苯)的收率可达30.5%。     

多级孔ZSM-5/SAPO-34复合分子筛制备及催化MTO性能研究

为制备性能更加优异的甲醇制烯烃（MTO）催化剂及进一步探究多级孔道对MTO催化反应的影响,采用柠檬酸溶液（CA）运用后处理方法对复合分子筛进行刻蚀,成功制备了具有多级孔道结构的ZSM-5/SAPO-34复合分子筛（CA-Z-S）。对复合分子筛的晶相、骨架、孔结构等理化性质进行了表征;将复合分子筛用于催化MTO反应,考察了复合分子筛的催化性能。表征结果表明,使用CA处理对ZSM-5/SAPO-34复合分子筛的形貌、结构会产生影响,使CA-Z-S具有更紧密的复合结构、适量的弱酸中心和多级孔道复合结构。催化测试结果表明,甲醇转化率达到100%时,CA-Z-S的寿命为1 200 min,较SAPO-34提高79%,较ZSM-5/SAPO-34提高30%;CA-Z-S对轻烯烃的选择性达到90.5%,较SAPO-34提高约3.7%。研究结果表明,利用CA对复合分子筛进行后处理,有利于复合分子筛催化MTO反应性能的提升。     

Synthesis of poly(acrylate-styrene)/poly(acrylate-styrene) core/shell latex and TOPEM-DSC characterization

Poly(acrylate-styrene)/poly(acrylate-styrene) core/shell latex particles were synthesized via seeded semi-continuous emulsion polymerization. Both core polymer (CP) and shell polymer (SP) were copolymerized by using three identical monomers of methyl methacrylate (MMA), butyl acrylate (BA) and styrene (St) with different composition ratios. The synthesized core/shell latex particle presents a phase separated state with the interfacial layer between CP and SP. In this study, the weight fractions and the corresponding thickness of this interfacial layer, CP and SP phase in the core/shell latex particle has be successfully calculated by using multi-frequency temperature-modulated differential scanning calorimetry (TOPEM-DSC). The results indicate that the interfacial layer thickness of the core/shell latex particle is determined by the core/shell structure, such as hard core/soft shell (defined as HC/SS) and soft core/hard shell (defined as SC/HS), the glass transition temperature (T_g) of the “hard” phase (correspondingly core or shell for HC/SS or SC/HS structure, respectively), and the existence of hydrophilic monomer during the copolymerization process such as acrylic acid. Meanwhile, the influence of film-formation-temperature on the microstructure of the latex films was systematically explored in this work.     

Synthesis of ZSM-5 zeolite from expanded perlite and its catalytic performance in FCC gasoline aromatization

A hydrothermal synthesis method for ZSM-5 preparation was investigated by using expanded perlite as the only alumina source. The effect of crystallization conditions on ZSM-5 zeolite formation, such as temperature, time, pH, chemical composition of the reaction mixture, were studied. The samples were characterized by XRD, IR, SEM, XRF and BET surface area measurements. The ZSM-5 zeolite from expanded perlite showed better catalytic activity for the FCC gasoline aromatization reaction compared to ZSM-5 prepared by the standard method.     

硅磷酸铝分子筛(SAPO-5)的合成

采用水热法合成大孔径硅磷酸铝分子筛（SAPO—5）,并通过试验确定了SAPO-5分子筛的最佳合成条件。AIOOH为铝源,磷酸为磷源,正硅酸乙酯为硅源和三乙胺为模板剂（R）。晶化温度为200℃,晶化时间24h。原料（用氧化物的形式表示）SiO2、Al2O3、P2O5、R和H2O适宜的摩尔比为（0.60～2．40）：1．00：1．00：1．00：1,00：40．00。并将合成出来的硅磷酸铝分子筛用于萘与丙烯的烷基化反应,进行了活性的研究。结果表明,在适宜的条件下,萘的转化率为97．56％,2,6-二异丙基萘（2,6-DIPN）的收率和选择性分别为40．06％和41．06％。     

ZSM-5凝胶体系硅铝比对SAPO-34/ZSM-5复合分子筛结构性质的影响

采用微波水热包覆法制备SAPO-34/ZSM-5复合分子筛。考察了ZSM-5凝胶体系硅铝摩尔比对复合分子筛微观结构和物化性质的影响,采用XRD、SEM、BET、NH_3-TPD等手段对合成的复合分子筛微观结构、形貌、孔结构及表面酸性质等进行分析表征。结果表明,ZSM-5凝胶体系硅铝比对复合分子筛样品晶相组成影响较小,但对样品比表面积、孔结构参数及表面酸性质影响较大。硅铝比为150时,SAPO-34/ZSM-5复合分子筛具有包裹状特殊晶体结构及多级孔(微孔孔容0.21 cm³/g、介孔孔容0.09 cm3/g、介孔孔容0.09 cm³/g)和弱酸中心(0.209 mmol/g)独特物化性质。     

ZSM-5凝胶体系硅铝比对SAPO-34/ZSM-5复合分子筛结构性质的影响

采用微波水热包覆法制备SAPO-34/ZSM-5复合分子筛。考察了ZSM-5凝胶体系硅铝摩尔比对复合分子筛微观结构和物化性质的影响,采用XRD、SEM、BET、NH_3-TPD等手段对合成的复合分子筛微观结构、形貌、孔结构及表面酸性质等进行分析表征。结果表明,ZSM-5凝胶体系硅铝比对复合分子筛样品晶相组成影响较小,但对样品比表面积、孔结构参数及表面酸性质影响较大。硅铝比为150时,SAPO-34/ZSM-5复合分子筛具有包裹状特殊晶体结构及多级孔(微孔孔容0.21 cm~3/g、介孔孔容0.09 cm~3/g)和弱酸中心(0.209 mmol/g)独特物化性质。     

无有机模板剂制备ZSM-5分子筛及其环己烯水合应用

以硫酸铝、水玻璃为主要原料,无有机模板剂条件下采用两步水热晶化法合成ZSM-5分子筛。系统研究钠硅比、水硅比和晶化时间等因素对ZSM-5分子筛结晶度和晶粒尺寸的影响。采用XRD和SEM对制备的ZSM-5分子筛进行结构表征,并考察ZSM-5分子筛在环己烯水合反应中的催化性能。结果表明,在一定钠硅物质的量比和水硅物质的量比范围,ZSM-5分子筛结晶度随钠硅物质的量比的增加与水硅物质的量比的减小而升高。无有机模板剂条件下制备ZSM-5分子筛,不仅降低生产成本,减少对环境的危害,而且在环己烯水合反应中表现出较好的催化活性,随着ZSM-5分子筛晶体尺寸减小,环己烯转化率提高。     

聚(甲基丙烯酸甲酯-CO-苯乙烯)/聚硅氧烷核壳微球的制备与应用

采用分散聚合法制备出聚（甲基丙烯酸甲酯-co-苯乙烯）种子微球,再将种子微球与甲基三甲氧基硅烷的水解溶液混合,加入氨水使硅烷水解产物在种子微球表面缩聚,制备出聚（甲基丙烯酸甲酯-co-苯乙烯）/聚硅氧烷核壳微球。采用SEM、TEM、粒度分析仪和FTIR对微球的形貌、核壳结构、粒径和化学组成等进行表征。发现在合成种子微球时提高甲基丙烯酸甲酯在共聚单体中的投料比,可使相应核壳微球的折光指数下降。将核壳微球作为光散射剂添加在聚甲基丙烯酸甲酯（PMMA）中制备出光散射材料。结果表明,核壳微球可显著提高PMMA样片的雾度,且PMMA样片的雾度随着核壳微球与PMMA的折光指数之间差值的增加而增加;当核壳微球的添加浓度为2%～3%（质量）时,制得的相似文献   

Pb(core)/ZnO(shell) nanowires obtained by microwave-assisted method

In this study, Pb-filled ZnO nanowires [Pb(core)/ZnO(shell)] were synthesized by a simple and novel one-step vapor transport and condensation method by microwave-assisted decomposition of zinc ferrite. The synthesis was performed using a conventional oven at 1000 W and 5 min of treatment. After synthesis, a spongy white cotton-like material was obtained in the condensation zone of the reaction system. HRTEM analysis revealed that product consists of a Pb-(core) with (fcc) cubic structure that preferentially grows in the [111] direction and a hexagonal wurtzite ZnO-(Shell) that grows in the [001] direction. Nanowire length was more than 5 μm and a statistical analysis determined that the shell and core diameters were 21.00 ± 3.00 and 4.00 ± 1.00 nm, respectively. Experimental, structural details, and synthesis mechanism are discussed in this study.     

ZSM-5的合成及应用进展

ZSM-5由于具有特殊的孔结构和物化性质而被广泛应用于化工各个领域。介绍了ZSM-5的合成方法及晶化机理,合成方法包括模板剂合成法（有机胺法、无机铵及醇类法）、微波合成法、无模板剂合成法,讨论了各种合成方法的优点和缺点,指出无模板剂的绿色合成方法是未来合成分子筛的重要方向。介绍了近年来ZSM-5在电化学、生物质、环境保护等领域的最新应用进展,为开发ZSM-5新的合成方法和利用途径提供参考。     

Synthesis of ZSM-5 zeolite from expanded perlite/kaolin and its catalytic performance for FCC naphtha aromatization

A hydrothermal synthesis method for ZSM-5 preparation was investigated by using expanded perlite (or kaolin) as the only alumina source. The ZSM-5 zeolites from the expanded perlite (or kaolin) have a distinctive pore systems which were a combination of a medium pore ZSM-5 zeolite and a large pore matrix perlite (or kaolin). The ZSM-5 zeolites from the expanded perlite (or kaolin) showed a better catalytic activity in the FCC naphtha aromatization reaction compared with ZSM-5 obtained by a ordinary method.     

ZSM-5/SAPO-34复合分子筛的制备与甲醇芳构化性能研究

采用Na OH溶液处理法制备了介孔ZSM-5分子筛。采用包埋法合成了ZSM-5/SAPO-34复合介孔分子筛,并采用X射线衍射图谱(XRD)、电子扫描电镜(SEM)、氮吸附进行分析,在固定床反应器中进行了甲醇芳构化反应。研究结果表明,ZSM-5/SAPO-34复合分子筛孔径呈微孔和介孔多级孔分布,孔径和孔容均高于ZSM-5分子筛。当ZSM-5与SAPO-34分子筛的质量比为1∶2时,ZSM-5/SAPO-34复合分子筛具有较好的芳构化活性。在反应温度为475℃、反应压力0.5 MPa、空速(LHSV)1.2 h-1条件下,BTX(苯、甲苯和二甲苯)的收率可达30.8%。