SOLID STATE NMR STUDIES AND REACTIVITY OF SILICA-SUPPORTED 12-TUNGSTOPHOSPHORIC ACID

摘要

NMR study of 12-tungstophosphoric acid (HPW) deposited on silica support was performed. The activity of these solids for n-hexane isomerization was also measured. The yield of the isomerization products increases with the HPW content in all cases. The NMR spectra show that, without care, the silica supported HPW balance between a bulk-like state and a quasi-liquid state without interaction with the support. The sample with a low HPW content and kept under inert atmosphere is well dispersed and interacts with silanol groups.