Effect of Crystal Size on Acetone Conversion over SAPO-34 Crystals |
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Authors: | Yuichiro Hirota Yuichi Nakano Kazuo Watanabe Yoshiaki Uchida Manabu Miyamoto Yasuyuki Egashira Norikazu Nishiyama |
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Affiliation: | (1) Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka Osaka, 560-8531, Japan;(2) Department of Materials Science and Technology, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan; |
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Abstract: | Abstract Catalytic properties of the 75 nm and 0.8 μm-sized SAPO-34 crystals on acetone-to-olefins (ATO) reaction were compared. The 75 nm-sized crystals (nanocrystals) showed longer catalyst lifetime than 0.8 μm-sized crystals, and products selectivity was similar for the two SAPO-34 catalysts, as is the case in methanol-to-olefins (MTO) and dimethyleter-to-olefins (DTO) reactions. The reaction site of ATO reaction over SAPO-34 was studied using coke-deposited SAPO-34 as catalysts whose pores are deactivated through the DTO reaction. The reason for longer catalyst lifetime of the nanocrystals in the ATO reaction must be a large surface area of the SAPO-34 nanocrystals, unlike in the case of the MTO and DTO reactions. |
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