FTIR Studies Of The Conversion Of Methanol On H-ZSM-5 zeolites

The hydroxyl groups of H-ZSM-5 type zeolite and their interaction with ethene has been studied by FTIR. Evidence is provided for (1) the existence of three types of silanol sites (2) the formation of a silanol-ethene hydrogen bonded complex and (3) the reaction of ethene, at higher temperatures, to produce non-volatile hydrocarbons. The latter involves the loss of a silanol site different from that involved in the hydrogen bonding.