Mesostructured vanadium-magnesium oxides (V-Mg-O) were synthesized using vanadium pentoxide and magnesium nitrate as sources and cetyltrimethylammonium bromide (CTAB) or the mixture of CTAB and hexadecylamine (HDA) as template. The effects of surfactant concentration,pHof the reaction medium, aging time, and temperature as well as aging mode (static or dynamic) were systematically investigated. The pH of the reaction medium and the surfactant concentration and nature were found to be the key parameters in the formation of V-Mg-O mesophases. When CTAB was employed alone as template and its concentration was higher than the critical micelle concentration, single lamellar mesophases were obtained in both acidic and neutral media. When the mixture of surfactants was used as template and its concentration was sufficiently low, only microporous phases were obtained in strongly acidic media (pHe 4), even at elevated aging temperatures and/or for long aging times. A mixture of mesophases could be, however, obtained in weakly acidic and neutral media (pH ) 4-7). At high surfactant concentrations, a single lamellar structure was generated in strongly acidic media and a mixture of mesophases in the weakly acidic and neutral ones. Only amorphous solids were generated in the basic range of pH, regardless of the surfactant concentration employed. With the change in aging time, numerous metastable phases have been identified, particularly in weakly acidic and neutral media.Somecomments about the mechanisms of formation of the mesophases conclude the paper.

运用TPSR、TR-FTIR和化学捕获技术（CH3I作捕获剂），探讨了Rh/Si02催化剂上的POM反应机理，由此提出热分解氧化机理，认为CHx（x=l～3）和CHxO（x=1～3）可能是反应物种。

Mesostructured vanadium-magnesium oxides (V-Mg-O) with various morphologies weresynthesized at room temperature using MgCl2 and V2O5 as source materials and a large number of surfactants as templates. It was found that, among the surfactants employed, the quaternary ammonium surfactants with long alkyl chains, such as cetyltrimethylammonium bromide (CTAB), or the nonionic surfactant Triton-X 100 could template V-Mg-O mesostructures. In the former case, the synthesized specimen had a lamellar structure and nanofibrous morphology. In the latter case, the specimen had a lamellar structure but a particulate morphology. Among the binary mixtures of cationic, anionic, or nonionic surfactants employed, only the combinations between a quaternary ammonium surfactant and hexadecylamine (HDA) were effective in templating a lamellar mesophase with nanofibrous morphology. The binary surfactants were more effective than the single surfactants in generating a higher regularity of the lamellar mesostructure. Mesostructured V-Mg-O could be synthesized even using binary mixtures consisting of HDA and a quaternary ammonium surfactant with a short alkyl chain, such as benzyltrimethyl (neither of the two was effective when used alone). The mesostructured V-Mg-O nanofibers synthesized with binary mixtures of surfactants were more stable during heating at high temperatures than those synthesized with a cationic surfactant alone.

导向剂的陈化时间和反应胶的晶化温度可以影响NaY分子筛的晶化行为。随导向剂陈化时间的增加，NaY分子筛的晶化速度加快，晶粒尺寸减小；随晶化温度的升高，NaY分子筛的晶化速度加快，但晶粒尺寸增加.而向合成体系中添加轻稀土离子（Ln3+）对NaY分子筛的晶化行为影响更为明显。与未添加稀土离子时相比较，在一定的稀土离子添加量范围内[n（Ln3+）ön（Al3+）<012]，NaY分子筛的晶化速度明显加快而晶粒尺寸显著减小，同时所合成出的NaY分子筛的n（SiO2）ön（Al2O3）比也有较大的提高。添加稀土离子使合成体系中形成异晶晶种的Ln（OH）3微晶，从而进一步引发NaY分子筛的成核。

NaY分子筛合成体系中添加铝的络合剂（乙二胺四乙酸、柠檬酸和醋酸），可有效地减小分子筛的晶粒尺寸及增加分子筛的晶化速度和SiO2Al2O3物质的量比。在添加柠檬酸的合成体系中，考察了柠檬酸的添加量对NaY分子筛晶化行为的影响。发现存在着一个最佳的柠檬酸的添加量范围，即n（柠檬酸）:n（氧化铝）≤2:1，在此范围内，NaY的晶化速率和硅铝比较高，而晶粒尺寸较小。