摘要
在乙胺和水的混合蒸汽相中,首次通过载体自转晶,在多孔玻璃表面原位合成了B-Al-MFI型沸石膜.X射线衍射和扫描电镜观察证明,膜中沸石晶体的取向是随机的.晶体尺寸的为15～25μm,单层晶体厚的膜约为10～20μm.在焙烧除去有机模板剂后的沸石膜上,O_2和N_2的透过性分别为0.095×10^(-8)和0.15×10^(-8)mol/(m^2·s·Pa).计算的O_2/N_2的理想选择性值(0.63)明显低于诺森扩散的理想选择性值(0.94)和透过原载体的理想选择性值(0.91).
An B - Al - MFI - type zeolite membrane was in - situ synthesized on the surfaces of a boron - silicon porous glass disc by substrate self- transformation in the vapor of ethylamine (EA) and H2O. Both XRD and SEM show that the zeolite crystals on the surfaces of the porous glass disc are in random orientation. The crystal sizes in the membrane are in the range of ca. 15- 25μm. The thickness of the membranes in the form of one - crystal layer is ca. 10 - 20μm. The permeability of the calcined B - Al - MFI - type zeolite membrane to O2 and N2 are 0.095×10-8 and 0.15×10-8mol/(m2·s·Pa) respectively. The calculated ideal selectivity of O2/N2(0.63) is obviously lower than that for Knudsen behaviour (0.94) and for the substrate (0.91).
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2000年第11期1311-1315,共5页
Acta Chimica Sinica
基金
国家自然科学基金重点基金(29236120-03)
关键词
B-Al-MFI型沸石膜
原位合成
蒸汽/固相反应
B - Al - MFI - type zeolite membrane, in - situ synthesis, substrate surface self - transformation, porous glass disc, vapor/solid phase reaction
