%0 Journal Article %T Ultrasonic and Microwave Pretreatment for Hydrothermal Synthesis of Nanosized SAPO-34 and Their Catalytic Performance in MTO Reaction (RESEARCH NOTE) %J International Journal of Engineering %I Materials and Energy Research Center %Z 1025-2495 %A Taghizadeh, Majid %A Sharifi Pajaie, Hassan %D 2015 %\ 03/01/2015 %V 28 %N 3 %P 330-337 %! Ultrasonic and Microwave Pretreatment for Hydrothermal Synthesis of Nanosized SAPO-34 and Their Catalytic Performance in MTO Reaction (RESEARCH NOTE) %K SAPO %K 34 %K Nanocatalysts %K MTO Reaction %K Lifetime %K Light olefins %R %X In order to enhance the catalytic performance of SAPO-34 catalyst for the reaction of methanol to olefins (MTO), ultrasonic and microwave-assisted aging method were employed in static hydrothermal method to synthesize nano-sized SAPO-34. The effects of the application of this method on the chemical composition, morphology, surface area and total acidity of SAPO-34 were characterized by XRD, FE-SEM, nitrogen adsorption–desorption and NH3-TPD techniques. The catalytic performance of synthesized SAPO-34 was investigated for MTO reaction in a fixed-bed reactor under the same operating conditions (T = 450 °C, P =1 atm, and WHSV = 4 h−1). Comparing with the SAPO-34 synthesized with conventional hydrothermal method, sample synthesized with simultaneous use of US and MW-assisted aging methods possesses larger surface area and small crystal size and exhibits higher selectivity to light olefins (C˭2-C˭4) and longer lifetime.  %U https://www.ije.ir/article_72461_6e17c4b132e0d31abf34b9e199be03af.pdf