The adsorption and reaction of 1-methylcyclopentene (MCPE) and 1-methylcyclopentanol (MCPOH) on HZSM-5 were studied by in-situ FTIR spectroscopy at 150−295 K. For MCPE, weakly adsorbed species, i.e., alkyl group adsorption on the acidic OH group, were predominant below 196 K. At 196 K and above, the π-OH complex was formed followed by stepwise formation of stable alkenyl carbenium ions and alkoxy species, characterized respectively by an IR band at 1520 cm -1 and by the shift of C−H stretching frequencies. For MCPOH, dehydration occurs at 268 K and MCPE is produced. The latter further forms alkenyl carbenium ions and alkoxy species progressively with the increase in temperature.
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Yang et al. (2001) studied this question.
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