用二次生长法制备MFI型分子筛膜,并用XRD和SEM对其进行了表征,通过测试氮气、氧气、氩气、氖气、氮气在分子筛膜上吸附的相对密度和相对压力相关数据,根据数据绘制的吸附等温线,都类似于反正切曲线.同时,也应用GCMC法,计算机模拟这些数据,绘制等温线,并与实验结果进行比较.结果证实GCMC法的模拟结果是可靠的.GCMC法模拟,可以直接应用于这类研究.由于吸附等温线类似于反正切曲线,就以类似于反正切函数的线性函数形式,建立吸附等温线的数学模型,用以定量研究该分子筛膜的吸附特性.进行相关与回归计算发现,相对密度与压力差的反正切值之间,都呈高度正相关(r≥0.9664).回归方程的回归系数为吸附特征常数,回归方程中所有的参数之间,也呈高度正相关(r≥0.9582),而且都有一个共同特点,即它们的值存在这样的顺序关系:氧＜氩＜氮＜氖＜氦.这样,通过分子筛膜吸附特征常数和这些气体的分子结构,有助于探讨MFI分子筛膜的吸附机理.
参考文献
| [1] | C R Acatlow.Modelling of Structure and Reactivity in Zeolites[M].AcademicPress,London,1992 |
| [2] | O G Mouritsen.Computer Studies o fPhase Transitions and Critical Phenomena[M].SpringerBerlin,1984 |
| [3] | Lin Y S;Kumakiri I;Nair B N;Alsyouri H .[J].Separation and Purification Technology,2002,32(02):229-379. |
| [4] | aertsch C D;Funke H H;Falconer J L;Noble RD .PermeationofAromatichydrocarbonVaporsthroughSilicalite-Zeolitemembrane[J].Physical Chemistry,1996,100(18):7676-7679. |
| [5] | M.Pan;Y.S.Lin .Template-free secondary growth synthesis of MFI type zeolite membranes[J].Microporous and Mesoporous Materials,2001(3):319-327. |
| [6] | Yi Zhang;Shin-ichi Furukawa;Tomoshige Nitta .Computer simulation studies on gas permeation of propane and propylene across ZSM-5 membranes by a non-equilibrium molecular dynamics technique[J].Separation and Purification Technology,2003(1/3):215-221. |
| [7] | Kobayashi Y.;Takami S.;Kubo M.;Miyamoto A. .Non-equilibrium molecular simulation studies on gas separation by microporous membranes using dual ensemble molecular simulation techniques[J].Fluid Phase Equilibria,2002(Special Issue SI):319-326. |
| [8] | Ryo Nagumo;Hiromitsu Takaba;Shigejirou Suzuki;Shin-ichi Nakao .Estimation of inorganic gas permeability through an MFI-type silicalite membrane by a molecular simulation technique combined with permeation theory[J].Microporous and Mesoporous Materials,2001(1/3):247-254. |
| [9] | D M Ruthven.Principles of Adsorption and Adsorption Processas[M].JohnWiley,NY,1984 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%