TY - JOUR
T1 - Synthesis of SAPO-18 with low acidic strength and its application in conversion of dimethylether to olefins
AU - Hirota, Yuichiro
AU - Yamada, Mayuka
AU - Uchida, Yoshiaki
AU - Sakamoto, Yasuhiro
AU - Yokoi, Toshiyuki
AU - Nishiyama, Norikazu
PY - 2016/9/15
Y1 - 2016/9/15
N2 - SAPO-18 molecular sieve was synthesized by a dry gel conversion (DGC) and hydrothermal (HT) synthesis methods using methyltriethoxysilane as the only Si source (DGC-Me-SAPO-18 and HT-Me-SAPO-18). Their physicochemical and catalytic properties on dimethylether-to-olefin (DTO) reaction were compared with those of conventional SAPO-18 molecular sieves synthesized by a hydrothermal synthesis method (HT-SAPO-18). An NH3-TPD measurement revealed that the desorption peak position of Brønsted acid of the Me-SAPO-18 samples moved to lower temperature, indicating that Brønsted acidic strength of the Me-SAPO-18 samples was lower than that of the HT-SAPO-18 samples. The DME conversions and yields of light olefins over DGC-Me-SAPO-18 decreased at a slower rate than those of HT-SAPO-18. The decreased acidic strength and flake-like morphology of DGC-Me-SAPO-18 could retard the coke formation, leading to the prolonged catalytic lifetime.
AB - SAPO-18 molecular sieve was synthesized by a dry gel conversion (DGC) and hydrothermal (HT) synthesis methods using methyltriethoxysilane as the only Si source (DGC-Me-SAPO-18 and HT-Me-SAPO-18). Their physicochemical and catalytic properties on dimethylether-to-olefin (DTO) reaction were compared with those of conventional SAPO-18 molecular sieves synthesized by a hydrothermal synthesis method (HT-SAPO-18). An NH3-TPD measurement revealed that the desorption peak position of Brønsted acid of the Me-SAPO-18 samples moved to lower temperature, indicating that Brønsted acidic strength of the Me-SAPO-18 samples was lower than that of the HT-SAPO-18 samples. The DME conversions and yields of light olefins over DGC-Me-SAPO-18 decreased at a slower rate than those of HT-SAPO-18. The decreased acidic strength and flake-like morphology of DGC-Me-SAPO-18 could retard the coke formation, leading to the prolonged catalytic lifetime.
KW - Brønsted acid strength
KW - Dimethylether-to-olefin (DTO) reaction
KW - Dry gel conversion
KW - SAPO-18
UR - http://www.scopus.com/inward/record.url?scp=84974782975&partnerID=8YFLogxK
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U2 - 10.1016/j.micromeso.2016.06.009
DO - 10.1016/j.micromeso.2016.06.009
M3 - Article
AN - SCOPUS:84974782975
VL - 232
SP - 65
EP - 69
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
ER -