期刊
REACTION KINETICS MECHANISMS AND CATALYSIS
卷 118, 期 2, 页码 701-717出版社
SPRINGER
DOI: 10.1007/s11144-016-1023-8
关键词
SAPO-34 molecular sieve; Mesogenous templates; MTO reaction; Light olefins
资金
- Iranian Nanotechnology Initiative Council
Ultrasonic and microwave-assisted aging processes were employed in the static hydrothermal synthesis of nanosized SAPO-34 molecular sieve. A series of nanosized hierarchical SAPO-34 samples with different degrees of mesoporosity were utilized to investigate the impacts of mesoporosity on the catalytic performance of the methanol to olefins (MTO) reaction. The so-called series were synthesized in the presence of various mesogenous templates, such as TPOAC, CTAB, and their combinations. These SAPO-34 samples were characterized by XRD, FE-SEM, BET, FT-IR and NH3-TPD techniques. The catalytic activities were studied in a fixed-bed reactor under atmospheric pressure, 450 A degrees C and WHSV of 4 h(-1). Comprehending the results, it can be said that in comparison with the typical catalysts, reliable MTO catalytic lifetime (420 min) as well as sufficiently high light olefins selectivity (90 %) was obtained through the nanosized hierarchical porous SAPO-34 templated with a mixture of 50 % CTAB and 50 % TPOAC. This achievement is associated to its effective combination of acidity and porosity.
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