High on speed: Brønsted acid sites and polyalkylbenzenium ions on SAPO-34 applied as catalyst for the methanol-to-olefin conversion for different times-on-stream were investigated by using a method consisting of ammonia adsorption and 1H high-speed MAS NMR spectroscopy. The selectivity of SAPO-34 to light olefins correlates with the number of accessible Si(OH)Al groups and polyalkylbenzenium ions.
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Dai et al. (2011) studied this question.
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