Light hydrocarbon sorption properties of pure silica Si-CHA and ITQ-3 and high silica ZSM-58
Light hydrocarbon sorption properties of pure silica Si-CHA and ITQ-3 and high silica ZSM-58
复制标题
DOI：
10.1016/j.micromeso.2003.09.025
复制
发表时间：
2004-01
影响因子：
5.2
通讯作者：
D. Olson;M. A. Camblor;L. Villaescusa;G. Kuehl
中科院分区：
文献类型：
--
作者：
D. Olson;M. A. Camblor;L. Villaescusa;G. Kuehl
测定了纯硅Si-CHA、ITQ-3和高硅ZSM-58（DDR结构型）三种八环沸石对轻烃的吸附性能，测定了乙烯、乙烷、丙烷和丙烯的吸附速率和吸附能。特别令人感兴趣的是这些沸石中的每一种所表现出的丙烯和丙烷的吸附速率的巨大差异。对于Si-CHA，在30 °C下D的比率为43，000，并且丙烯和丙烷的扩散活化能分别为100 kJ/mol和73 kJ/mol，表明活化扩散控制丙烷通过其8-环的扩散速率。扩散系数的大小顺序为乙烯>乙烷>丙烯>丙烷>正己烷。所有三种沸石都具有从丙烯/丙烷混合物中分离丙烯的潜力。
The light hydrocarbon sorption properties of the three 8-ring zeolites, pure silica Si-CHA and ITQ-3 and high silica ZSM-58 (DDR structure type), have been measured and the adsorption rates and adsorption energies of ethene, ethane, propane and propene were determined. Of particular interest is the large difference in the rates of adsorption of propene and propane exhibited by each of these zeolites. For Si-CHA the ratio of the D’s is 43,000 at 30 °C and the activation energies for diffusion of propene and propane are ∼10 and 73 kJ/mol, respectively, indicating that activated diffusion controls the diffusion rate of propane through its 8-rings. The diffusivity decreases in the order ethene∼ethane>propene≫propane>n-hexane. All three zeolites have potential for the separation of propene from propene/propane mixtures.