三氨基甲酸酯链有机硅季铵盐导向下多级孔ZSM-5沸石的制备和表征

采用一种新颖的三氨基甲酸酯链有机硅季铵盐作为介孔结构导向模板剂合成沸石分子筛,通过XRD、SEM、TEM和氮吸附进行结构表征。结果表明,所得沸石分子筛为椭圆状的多级孔道ZSM-5沸石分子筛,其介孔孔径主要在3. 5 nm左右。     

三氨基甲酸酯链有机硅季铵盐导向下多级孔ZSM-5沸石的制备和表征

采用一种新颖的三氨基甲酸酯链有机硅季铵盐作为介孔结构导向模板剂合成沸石分子筛,通过XRD、SEM、TEM和氮吸附进行结构表征。结果表明,所得沸石分子筛为椭圆状的多级孔道ZSM-5沸石分子筛,其介孔孔径主要在3. 5 nm左右。     

新型多级孔ZSM-5沸石分子筛制备与研究

本研究通过在传统ZSM-5沸石分子筛的基础上引入有机硅烷季铵盐作为介孔导向模板剂制备了四种新型多级孔ZSM-5沸石分子筛。利用XRD、N2吸附脱附、SEM、TEM进行结构表征,结果表明以十四烷基双氨基甲酸酯基有机硅烷季铵盐作为介孔模板剂,所制得的ZSM-5-L2新型多孔级分子筛表面结晶度较好,SEM图为椭圆形颗粒,晶体表面密集粗糙,具有有序的介孔孔道,介孔孔道占总孔容的比例相对于其他样品更大,且介孔孔道约为4.0 nm左右,满足企业对材料改性及提升性能的需求。     

介孔ZSM-5分子筛材料的制备及催化应用研究进展

介孔沸石分子筛具有沸石优良的水热稳定性、酸性和择形性,并兼具介孔的传质优势,使反应物更易接触到催化剂内表面活性中心,从而提高材料的催化活性,所以,介孔沸石分子筛近年来得到大量研究.综述了介孔ZSM-5沸石分子筛的制备方法,主要评述了模板法和后处理改性法;介绍了该催化材料在裂化、芳构化、异构化及烷基化过程中的应用;指出了介孔ZSM-5分子筛的发展方向.     

饱和ATP为原料合成多级孔ZSM-5沸石分子筛的制备与表征

研究以饱和ATP吸附材料为合成沸石分子筛的硅源,采用双模板法,用四丙基氢氧化铵(TPAOH)为微孔模板剂和十六烷基三甲基溴化烷(CTAB)为介孔模板剂直接合成多级孔ZSM-5沸石分子筛,通过XRD、SEM、比表面积及孔径分析仪进行N2吸附-脱附等手段对多级孔ZSM-5沸石分子筛表征测试分析。结果表明,饱和ATP吸附材料在180℃下,水热提纯12 h获得硅源,再加入TPAOH和CTAB进行初始凝胶反应,后移入水热反应釜中,控温180℃,水热晶化反应15 h,即得多级孔ZSM-5沸石分子筛。     

饱和ATP为原料合成多级孔ZSM-5沸石分子筛的制备与表征

研究以饱和ATP吸附材料为合成沸石分子筛的硅源,采用双模板法,用四丙基氢氧化铵(TPAOH)为微孔模板剂和十六烷基三甲基溴化烷(CTAB)为介孔模板剂直接合成多级孔ZSM-5沸石分子筛,通过XRD、SEM、比表面积及孔径分析仪进行N2吸附-脱附等手段对多级孔ZSM-5沸石分子筛表征测试分析。结果表明,饱和ATP吸附材料在180℃下,水热提纯12 h获得硅源,再加入TPAOH和CTAB进行初始凝胶反应,后移入水热反应釜中,控温180℃,水热晶化反应15 h,即得多级孔ZSM-5沸石分子筛。     

多级孔ZSM-5沸石分子筛制备方法研究进展

在微孔ZSM-5沸石分子筛中引入介孔结构制备多级孔ZSM-5沸石分子筛,可以很好的解决传统ZSM-5沸石分子筛在分子扩散方面受限和催化剂失活的问题。综述了几种多级孔ZSM-5沸石分子筛的制备方法,着重介绍后处理法、硬模板法以及软模板法,分析了不同制备方法的优缺点,简单介绍了其他制备方法。阐明了探索更加经济、环保、易操作的多级孔沸石分子筛制备方法仍然是科研工作者们努力的方向。     

南京黄马化工有限公司

<正> (专业生产各类特种分子筛和催化剂) 南京黄马化工有限公司位于南京市东郊,是国内规模较大的专业生产各类ZSM-5沸石分子筛、丝光沸石、β分子筛、其它介孔沸石分子筛等的特种分子筛和催化剂厂。特种分子筛主要产品有:不同硅铝比ZSM-5分子筛,从低硅(SiO_2/Al_2O_3=25～30)、常规(SiO_2/Al_2O_3=32～40)、中硅(SiO_2/Al_2O_3=50～120)到高硅(SiO_2/Al_2O_3=260～300);不同晶粒度ZSM-5分子筛从大晶粒(1～4μm)、小晶粒(200～500 nm)到纳米级(100～200 nm)ZSM-5分子筛;钠型和氢型丝光沸石;     

以双长碳链烷基酰胺乙基有机硅季铵盐为模板制备介孔ZSM-5沸石及其表征

为使沸石分子筛具有更大的孔隙率,使用一种新型有机硅季铵盐介孔模板剂,采用一步水热合成法制备了含介孔沸石。在150℃下水热反应72 h, 100℃干燥4 h, 600℃下焙烧6 h获得ZSM-5-H产品。采用X射线衍射(XRD)、扫描电镜(SEM)、氮吸附方法对其进行表征,结果表明,所得沸石分子筛具有良好的晶态结构和较大的介孔体积。其粗糙的表面和丰富的介孔证明了所合成的模板剂具有改变沸石形貌和内部构造的功能。     

C7碳氢化合物在纳米级介孔ZSM-5沸石中的扩散性能

实验选取了碳原子数相同、结构和分子动力学直径不同的正庚烷和甲苯作为探针分子,通过零长柱法(zero-length column,ZLC)考察了纳米级介孔ZSM-5沸石的孔结构对探针分子扩散性能的影响。采用Crank扩散模型计算了有效扩散时间常数,并估算了扩散活化能。实验结果表明,由于甲苯比庚烷分子结构复杂、分子动力学直径大,因此甲苯在ZSM-5样品中的扩散活化能约为庚烷的1.5倍,有效扩散时间常数远小于庚烷。庚烷和甲苯在纳米级介孔ZSM-5沸石中的扩散速率取决于粒径的大小,两者在纳米级介孔ZSM-5中的有效扩散时间常数是微米级纯微孔ZSM-5的两倍,然而两者在微米级纯微孔ZSM-5中的活化能为纳米级介孔ZSM-5中的两倍,说明对于纳米级介孔ZSM-5,微粒粒径减小、扩散路径缩短,对扩散起到了极大的促进作用。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料，介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比，介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序，对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.