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- W2194941771 abstract "Abstract Hierarchical SAPO-11 molecular sieve was synthesized via a seeded crystallization approach as reported in this paper. SAPO-11 molecular sieve was first synthesized in common Al2O3-P2O5-Dipropylamine-H2O system. Nitrogen adsorption test indicated that the synthesized SAPO-11 has additional mesoporosity with a mesopore volume being 0.09 cm3/g. SEM and TEM analysis indicated the formation of a core (microporous SAPO-11)/shell (mesoporous SAPO-11 aggregate) structure. With the purpose to improve the mesoporosity, SAPO-11 seed was added into the Al2O3-P2O5-Dipropylamine-H2O system. XRD, SEM, TEM, and nitrogen adsorption tests indicated hierarchical SAPO-11 molecular sieve with mesopore volume up to 0.40 cm3/g can be synthesized in Al2O3-P2O5-Dipropylamine-H2O system with 2–10% SAPO-11 molecular sieve as seed. SEM and TEM studies indicate the formation of SAPO-11 nanorods with ultra-small diameter (5 nm). A crystallization kinetic study indicated that 6 h is sufficient for the formation of highly crystalline hierarchical SAPO-11 molecular sieve. The texture and acidity of hierarchical SAPO-11 can be controlled by changing the crystallization time. Based on the experimental results, the formation of hierarchical SAPO-11 is an integrated effect of the burst nucleation and special rod shape of SAPO-11 nanocrystal and the role of SAPO-11 seed is promoted nucleation by increasing the surface area of the liquid–solid interface." @default.
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- W2194941771 date "2015-12-01" @default.
- W2194941771 modified "2023-10-18" @default.
- W2194941771 title "Synthesis of hierarchical SAPO-11 via seeded crystallization" @default.
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- W2194941771 doi "https://doi.org/10.1016/j.micromeso.2015.06.040" @default.
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