TEM studies indicated that MCM-41 does not have an ideal mesopore structure; however, it may still be treated as a model mesoporous material for gas adsorption studies because of the large radius of curvature of the channels.doi:10.1016/S0167-2991(00)80023-3C. G. Sonwane...
(~,nigtime,e~smflizmgtime,einedtemperature)onhtec~-stnlstructureofMCM-41 Theresultsshow htathte’synhtesisconditionsnfmesoperOLlSmolecularsieveMCM-41aIepH10.5～ 125,surfactant/Si 005—07,H1O/St0240～200,preferablylongera觑 timeWaSbetter,24一 hourse~ lliznigtime.aeldned temperature 540～740 ...
(Si一0 一)ofmesoporousmolecularsieveMCM一41react withTiandthecompoundsamplehascharacteristicpeaksat959cm——1duetoTi——O— —Siformation;nano——TiO2notonly arewelldistributedtheinnerwallofmesoporousMCM--41,butalsomakesMCM-41remaini tsorderedchannel structure, Keywords:mesoporousmolecularsieveMCM一41;nano...
1.4 nm in average are observed using TEM), care must be taken in order to avoid the collapse of the MCM-41 structure during the drying step. The loss of the XRD peaks characteristic of the MCM-41 structure and the important decrease in the surface area (-30%) and in Acknowledgments ...
分类 化学助剂 别名 沸石mcm-41 品牌 ZR 型号 mcm-41 产品名称 沸石mcm-41 CAS 1318-02-1 颜色 白色 应用程序 催化裂化 包装 滚筒 材料 铝硅酸盐 Ph值 3-5 密度 0.45-0.55g/cm3 存储 阴凉干燥处 等级 Industrail级 包装和发货信息 Packaging Details ...
XRD studies indicated that the materials had the standard MCM-41 structure. FTIR studies showed that zirconium and manganese ions were incorporated into the hexagonal mesoporous structure of Zr–Mn-MCM-41 and Mn-MCM-41. The thermal stability of the as-synthesized materials was studied using TG/...
Surface propertiesCo-modified mesoporous supports with MCM-41 structure and several metal loadings were successfully synthesized by a fast wet impregnation method. The nature and location of different Co species formed on the solids were inferred by TEM/SEM, XPS, XANES/EXAFS, adsorption of pyridine ...
在2.33A,4. 60A和6.87A有3个 较为明显的衍射峰,分别代表了MCM.41分子筛的(100), (110)和(200)晶面,与YuJing的研究结果基本一到。 相对浓度定义为某一晶面上的原子数与整个模型的 原子数之比。图4为(100)、(010)和(OOl13个晶面上的相 对浓度分布,在整个范围内相对浓度的值都在波动。说 明构建的模型...
Rathousky, J. et al., Time-resolved in situ x-ray diffraction study of MCM-41 structure formation from homogeneous environment, Phys. Chem. Chem. Phys., 1, 3053, 1999.Rathousky, J., Schulzekloff, G., Had, J. and Zukal, A. (1999) Time-resolved in-situ X-ray-diffraction study...
Structure & Synthesis MCM-41 has a hierarchical structure that has, as its base, an ordered arrangement of cylindrical mesopores that range in diameter from 2nm to 6.5nm. These independently adjustable mesopores form a unique, one-dimensional pore system that has sharp, well-defined pore distribut...