首页|Acid properties and morphology of SAPO-11 molecular sieve controled by silica source
Acid properties and morphology of SAPO-11 molecular sieve controled by silica source
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NSTL
This paper reports on the control of strong acid sites in SAPO-11 molecular sieve crystals using different silica sources.The crystallization process of the SAPO-11 molecular sieves was performed using silicon sources with different particle sizes,i.e.,fumed silica(200 nm),colloidal silica(22 nm),and SiO2 sol prepared by the sol-gel method(4 nm).The SiO2 sol proved to have a significant effect on the acidic properties,morphology and crystal size of SAPO-11 molecular sieve.Moreover,more efficient incorporation of silicon is achieved,providing an increased concentration of acid sites.The SAPO-11 intergrown crystals with a size of 100-300 nm exhibited hierarchical pore structure(Sbet-250 m~2/g and V_(meso)-0.27 cm~3/g)were synthesized using the SiO2 sol precursor.The SAPO-11 molecular sieves were tested in the reaction of a-methylstyrene dimers synthesis.The SAPO-11 samples,synthesized by SiO2 sol showed the highest monomer conversion and linear dimer selectivity.
SAPO-11 silicoaluminophosphateSAPO-11 nanosized crystalsSol-gel methodDimerization of a-methylstyrene
NSTL
