Abstract
Herein,weshow that SAs prepared by flame-spray pyrolysis (FSP SAs)exhibit a strong Bronsted acidity resembling that of zeolites.Some Bronsted acid sites in the FSP SAs were found to beeven stronger than those of H-ZSM-5, which is regarded asthe most acidic zeolite.Bronsted acidity of SAs is generated by having neighbor-ing aluminum and silanol groups. However, inhomogeneouscomposition of the SAs resulting from existing preparationmethods, such as cogelation, grafting, co-precipitation, andhydrolysis, hinder enhancement of their acidity. Control overpH values and high temperature calcinations are oftenrequired in these methods for the diffusion of aluminumand silicon throughout the phase or network.
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