Conversion of methanol to propylene over SAPO-14: Reaction mechanism and deactivation

Methanol to olefins (MTO) reaction as an important non-oil route produce light has been industrialized, and received over 80% ethylene plus propylene selectivity. However, achieve high single or selectivity towards the fluctuated market demand is still full of challenge. Small-pore SAPO-14 molecular sieve a rare MTO catalyst exhibiting extra-high It provides us valuable clue for further understanding relationship between structure catalytic performance. In this work, seconds-level sampling fixed-bed reactor was used capture real-time product distributions, which help more data in response very short life SAPO-14. Changes distribution, especially during low activity stage, reflect information on pathway. Combined with situ diffuse reflectance infrared Fourier-transform spectroscopy, ultraviolet Raman measurements 12C/13C isotopic switch experiments, pathway evolution from dual cycle olefins-based dominant revealed. addition, deactivation behaviors were also investigated, revealed that polymethylbenzenes have deactivated species such situation. This work helpful hints development characteristic methanol (MTP) catalysts.