SEARCH Articles Figures Tables Al triple-quantum MAS NMR spectra of commercial zeolite mordenite in the hydrogen form, unheated and heated to various temperatures followed by hydration. Spinning side bands are marked by asterisks. The final spectrum is of a sample heated in two steps, of 650 C and 500 C with an intermediate rehydration step. After Chen et al. , by permission of copyright owner. [Publishers Imprint]