SAPO-34 and nano ZSM-5 sieves in methanol Comparison of catalytic performance in conversion to olefins
SAPO-34 has an ellipsoidal cage with an 8-member ring and three dimensions.The structure of the channel, the diameter of the orifice is maintained at 0.43 ~ 0. Between 5O nm. The reason for its good M T O catalytic performance is due to the small channel size, Moderate acidity and good hydrothermal stability [3. Z S M-5 with Yes.Two-dimensional 10-element ring hole channel [19], the hole diameter is 0. 55 nm left and right with heat Features of high stability and catalytic activity ¨]. So explore these two .The catalytic effect of the catalyst makes it more suitable for industrial production needs. There are important practical implications.
The SAPO-34 with a C H A structure and a Nami ZSM5-point molecular sieve with a M F I structure were synthesized.x R D, B E T, N H. A T P D, S E M and other means have performed characterization, and examined its reaction in the conversion of methanol to olefins (M T 0).Catalyze performance. The results show that: in the M T o catalytic reaction, the SAPO-34 molecular sieve showed very high selectivity of ethylene and propylene, andNami ZSM-5 has a higher selectivity for propylene. At the same time, the small crystal nanometer Z S M-5 has a long catalyst life, so it hasThere are potential industrial applications in the future.
