Abstract
Mesoporous silica molecular sieves MCM-41 containing zinc and aluminum ions (Zn−Al−MCM-41) with Si/(Zn + Al) ratios equal to 75, 151, 228, 304, and 380 and only aluminum ions with Si/Al ratios equal to 21, 42, 62, 83, and 104 were synthesized under hydrothermal conditions using cetyltrimethylammonium (CTMA+) surfactants as templates in the absence of auxiliary organics. The mesoporous materials, viz., Zn−Al−MCM-41 and Al−MCM-41, were characterized using several techniques, e.g., ICP-AES, XRD, FTIR, TG/DTA, nitrogen adsorption, 27Al MAS NMR, SEM, TEM, XPS, and pyridine acidity (TPD and FTIR) measurements. The number of acid sites in Zn−Al−MCM-41 is higher than that in Al−MCM-41 due to the aluminum ion nonframework by the introduction of zinc ions. However, tetrahedral aluminum is replaced by zinc, producing two negative ions with a tetrahedral environment. The ions are associated with Bronsted acid sites, and the tetrahedral aluminum ions become octahedral aluminum ions and are associated with Lewis acid s...
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