The maximum overlap method was used to study the relationships the C-H stretching frequencies, group electronegativities and proton acidity properties and the molecular structure in the halomethanes.
本文借助最大重叠杂化轨道理论，研究了卤代甲烷系列分子的红外伸缩频率，基团电负性和质子酸度等分子性质与结构的关系。
According to the great influence of system acidity and alkalinity on MCM41 molecular sieve formation in hydrothermal condition, a detailed formation mechanism of MCM41 was proposed.
在水热体系中，合成介质的酸碱性对MCM - 41分子筛的生成有很大的影响，据此提出了MCM - 41分子筛生成的详细机理。
Latest researches in SAPO-18 molecular sieve were reviewed with respect to its synthesis, structure, acidity and application in methanol-to-olefins (MTO) process.
介绍了SAPO - 18分子筛的合成、结构组成、酸性表征及其在催化甲醇制烯烃(MTO)反应中应用的最新研究情况。
According to the results of catalytic characterization, the relationships among structure, acidity, base and catalytic performance of different acid mesoporous molecular sieves were studied.
并结合结构表征结果，详细研究了各种改性介孔分子筛的结构、酸、碱性质与催化性能之间的关系。
The catalyst provided by the invention is obtained by the method that the surface acidity and the pore structure of a metal modified zeolite molecular sieve are decorated by siloxy group compound;
本发明所提供的催化剂由金属改性后的沸石分子筛再经硅氧烷基化合物修饰表面酸性和孔结构得到；
The catalyst provided by the invention is obtained by the method that the surface acidity and the pore structure of a metal modified zeolite molecular sieve are decorated by siloxy group compound;
本发明所提供的催化剂由金属改性后的沸石分子筛再经硅氧烷基化合物修饰表面酸性和孔结构得到；
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