Mesoporous molecular sieves of MCM-41 type modified with Cs, K and Mg -physico-chemical and catalytic properties

摘要

Siliceous, aluminosilicate, and niobosilicate mesoporous molecular sieves of MCM-41 type were modified with Cs, K, and Mg via an ion exchange and impregnation. The impregnation with Cs-acetate leads to a partial structural distortion of mesoporous sieves used. In spite of that Cs-impregnated NbMCM-41 exhibits the highest basicity, whereas, Cs template ion exchanged materials as well as Cs-impregnated AlMCM-41 show the acid-base properties. K-impregnated MCM-41 is only less basic than Cs/NbMCM-41, and thanks to its stability during the modification, one can recommend K/MCM-41 mesoporous molecular sieves as an effective basic catalysts.