Abstract
This chapter discusses the role of the various acid sites in mordenite (MOR) on o-xylene conversion. Two different bridged hydroxyl (OH) are distinguished in MOR (in side pockets or main channels). The activity of these two different acid sites is studied by in situ infrared (IR) spectroscopy of working catalysts. Progressive Na+/H+ exchange is used to prepare the various samples. Acid strength in the main channels is not influenced by the presence of Na+ in the side pockets. In xylene isomerisation, OH groups in the side pockets strongly influence initial selectivity for disproportionation and final coke amount, although they do not directly participate in the reactions.
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