The interaction and nature of surface sites for water and methanol sorption on MFI-type zeolites and mesoporous SBA-15 were investigated by solid-state NMR spectroscopy and correlated with the desorption enthalpies determined via TGA/DSC. For siliceous Silicalite-1, ²⁹Si CPMAS NMR studies support stronger methanol than water interactions with SiOH groups of Q³-type. On siliceous SBA-15, SiOH groups of Q²-type are accompanied by an enhanced hydrophilicity. In aluminum-containing Na-ZSM-5, Na⁺ cations are strong adsorption sites for water and methanol as evidenced by ²³Na MAS NMR in agreement with high desorption enthalpies of ΔH = 66–74 kJ/mol. Solid-state NMR of aluminum-containing Na-[Al]SBA-15, in contrast, has shown negligible water and methanol interactions with sodium and aluminum. Desorption enthalpies of ΔH = 44–60 kJ/mol hint at adsorption sites consisting of SiOH groups influenced by distant framework aluminum. On H-ZSM-5, Brønsted acidic OH groups are strong adsorption sites as indicated by partial protonation of water and methanol causing low-field shifts of their ¹H MAS NMR signals and enhanced desorption enthalpies. Due to the small number of Brønsted acid sites in aluminum-containing H-[Al]SBA-15, water and methanol adsorption on this material is suggested to mainly occur at SiOH groups with distant framework aluminum species, as in the case of Na-[Al]SBA-15.

通过固态NMR光谱研究了MFI型沸石和中孔SBA-15上水和甲醇吸附表面部位的相互作用和性质，并将其与通过TGA / DSC确定的解吸焓相关。为硅质的Silicalite-1，^29个的Si CPMAS NMR研究支持比Q的SiOH基团与水的相互作用更强的甲醇³型。在硅质SBA-15上，Q ²型的SiOH基团具有增强的亲水性。在钠铝的Na-ZSM-5中，Na ⁺阳离子是水和甲醇的强吸附位点，这是由²³ Na MAS NMR证实的，并且它具有较高的ΔH解吸焓。 = 66-74 kJ / mol。相反，含铝的Na- [Al] SBA-15的固态NMR显示，水和甲醇与钠和铝的相互作用可忽略不计。ΔH  = 44–60 kJ / mol的解吸焓暗示了受远端骨架铝影响的由SiOH基组成的吸附位。在H-ZSM-5上，布朗斯台德酸性OH基团是很强的吸附位点，如水和甲醇的部分质子化所致，这会导致其¹ H MAS NMR信号发生低场移动并增强解吸焓。由于含铝的H- [Al] SBA-15中的布朗斯台德酸位很少，因此建议该材料上的水和甲醇吸附主要发生在骨架铝种类较远的SiOH基团上，如Na- [Al] SBA-15。