摘要
以高硅NaY(n(SiO2)/n(Al2O)≥5.0)为前驱体,在水热体系中合成出了具有双微孔结构的复合分子筛HS-FBZ(High—Silica-Faujasite—Beta-Zeolite);采用XRD、BET、SEM和FT—IR等手段对其结构进行表征;并对n(OH)/n(SiOz)、晶化时间等合成条件进行了研究。结果表明,以高硅NaY为前驱体在水热体系中合成的双微孔复合分子筛HS—FBZ具有Y型沸石和Beta沸石的特征,但是区别于Y型沸石和Beta沸石的机械混合物;胶体投料的最佳n(OH)/n(SiO2)范围为0.59~0.61,HS—FBZ分子筛中两组分的相对含量可通过控制晶化时间来调节。HS-FBZ分子筛在750℃具有良好的水热稳定性。
Bi-microporous composite zeolite HS-FBZ (High-Silica-Faujasite-Beta-Zeolite) was synthesized in the hydrothermal system by using high silica NaY (n(SiO2)/n(Al2O3)≥5.0) as precursor, and characterized by XRD, BET, SEM and FT-IR. The effects of the crystallization time and n (OH-)/n(SiO2) were also studied. The synthesized bi-microporous composite zeolite HS-FBZ possessed the characteristics of Y and Beta, but different characteristics from that of their mechanical mixture. The optimal n(OH )/n(SiO2) of gel for synthesis was 0.59 -0.61. The relative proportion of Y and Beta in the composite could be adjusted by controlling the crystallization time. It was revealed that HS-FBZ had a good hydrothermal stability at 750℃.
出处
《石油学报(石油加工)》
EI
CAS
CSCD
北大核心
2006年第B10期96-99,共4页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家重点基础研究发展规划(973)项目(2005cB221204)资助
关键词
高硅NaY
复合分子筛
双微孔
合成及表征
水热稳定性
high silica NaY
composite zeolite; bi-micropore
synthesis and characterization
hydrothermal stability