关键词: 三聚甲醛;悬浮聚集陈化法;EMT分子筛

Abstract: EMT molecular sieves were synthesized by suspension aggregation aging method at room temperature using trioxymethylene as the organic additive, sodium silicate as the silicon source, and sodium aluminate as the aluminum source.The influence of gel composition, crystallization temperatures and crystallization time on the synthesis of EMT molecular sieves were investigated.The synthesized EMT molecular sieve was characterized by XRD, FT-IR, SEM, BET and ICP.The favorable synthetic conditions for the EMT zeolites are nNa2O∶nAl2O3∶nSiO2∶nH2O∶nTOX=18.5∶1∶5∶240∶0.5, crystallization temperature for 30 ℃, crystallization time for 72 h.EMT molecular sieves were synthesized under above condition, XRD characteristic diffraction peaks are stronger, consisted with typical characteristics of diffraction peaks of the EMT molecular sieve, andtherelative crystallinity is 80.1;, Si/Al is 2.01, BET specific surface area is 80.57 m2/g, pore volume and pore diameter are 0.03 cm3/g and 2.07 nm, respectively.SEM images show the spherical crystal particles grow together, with uniform size and compact arrangement.

Key words: EMT molecular sieves were synthesized by suspension aggregation aging method at room temperature using trioxymethylene as the organic additive, sodium silicate as the silicon source, and sodium aluminate as the aluminum source.The influence of gel composition, crystallization temperatures and crystallization time on the synthesis of EMT molecular sieves were investigated.The synthesized EMT molecular sieve was characterized by XRD, FT-IR, SEM, BET and ICP.The favorable synthetic conditions for the EMT zeolites are nNa2O∶nAl2O3∶nSiO2∶nH2O∶nTOX=18.5∶1∶5∶240∶0.5, crystallization temperature for 30 ℃, crystallization time for 72 h.EMT molecular sieves were synthesized under above condition, XRD characteristic diffraction peaks are stronger, consisted with typical characteristics of diffraction peaks of the EMT molecular sieve, andtherelative crystallinity is 80.1;, Si/Al is 2.01, BET specific surface area is 80.57 m2/g, pore volume and pore diameter are 0.03 cm3/g and 2.07 nm, respectively.SEM images show the spherical crystal particles grow together, with uniform size and compact arrangement.