19 resultados para MFI


Relevância:

20.00% 20.00%

Publicador:

Resumo:

本发明提供一种具有MFI结构含镓沸石的制备方法,采用廉价原料(如水玻璃、硝酸镓、一级胺)在水热体系中晶化合成具有MFI结构的含镓沸石,原料易得,可大幅度降低成本。用本发明的方法所制备的沸石与用四级铵作模板剂所得产品相比,原粉经焙烧后就具有较高的酸性,Na/Ga〈0.5,不经酸交换就可用作吸附剂、催化剂或催化剂的组成部分。

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Silicalite-I, ZSM-5, and Fe-ZSM-5 zeolites prepared from two different silicon sources are characterized by UV resonance Raman (UVRR) spectroscopy, X-ray diffraction (XRD), electron spin resonance (ESR), and UV/visible diffuse reflectance spectroscopy (UV/Vis DRS). A new technique for investigating zeolitic structure, UV resonance Raman spectroscopy selectively enhances the Raman bands associated with framework iron atoms incorporated into MFI-type zeolites, and it is very sensitive in identifying the iron atoms in the framework of zeolites, while other techniques such as XRD, ESR, and UV/Vis DRS have failed in uncovering trace amounts of iron atoms in the framework of zeolites. (C) 2000 Academic Press.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

基于建立的车载直接探测激光雷达系统,对接收光学鉴频器进行了研究。针对边界层、对流层和平流层不同的气溶胶和大气分子浓度以及风速动态范围,同时采用直接探测的两种主要技术。利用多光束菲索(Fizeau)干涉仪(MFI)和阵列光电倍增管(PMT),接收气溶胶散射信号,获得边界层风速。采用双法布里-珀罗(Fabry-Perot)干涉仪(DFP)和光电倍增管探测器,分析分子散射信号,得到对流层风场。使用实际的激光雷达系统参数和大气模型参数,对两个鉴频器进行了优化设计,分析了它们的风速测量灵敏度和精度。多光束菲索干涉仪

Relevância:

10.00% 10.00%

Publicador:

Resumo:

在大参数量实验的数据获取中,事例判选和非相关数据排零必须解决的问题,LIST方式把大量参数中相关的数据路集中成组,相应的预先生成分组的CNAF命令表,每次触发时并不读出所有的数据路,而是只读出与触发信号直接关联的几组参数,HARDWARE LIST方式采用硬件实现以上功能,提高了数据获取速度。本文介绍我们研制的一个HARDWARE LIST方式的数据获取与分析系统。硬件的关键部件是CAMAC多机箱控制器和单总线适配器-MFI-9,它同时采用了前端缓存和双向DNA机制。软件完成获取驱动,基本的在线分析和在线监视,提供简单明了的用户接口,设计时保证了系统的完整性,模块的独立性和易扩展性

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Poly(acrylonitrile-butadiene-styrene), polycarbonate (PC), and two types of antioxidants have been blended by an extruder twin screw. Notched Izod impact strength, tensile property, and melting flow index (MFI) were measured for the blends including diffe