The Calculation and Study on the Window Effects in Zeolite Diffusion with a Two-Dimensional Model
碩士 === 國立中興大學 === 化學工程學系所 === 95 === The window effect was first documented in Gorring (1973), in which an unexpected phenomenon was found that the diffusivity of normal paraffins in zeolite T does not monotonously decrease as chain lengths increases. Instead, n-dodecane(C12) diffuses faster than n-...
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| Format: | Others |
| Language: | zh-TW |
| Online Access: | http://ndltd.ncl.edu.tw/handle/64731929730823616564 |
| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 95 === The window effect was first documented in Gorring (1973), in which an unexpected phenomenon was found that the diffusivity of normal paraffins in zeolite T does not monotonously decrease as chain lengths increases. Instead, n-dodecane(C12) diffuses faster than n-octane(C8) with two orders of magnitude. An preliminary one-dimensional model implementing window effect was later developed by Nitsche and Wei (1991) to study the diffusion of normal alkanes in zeolites.
In this work, a two-dimensional configurational diffusion model incoperated with reasonable potential model of interaction between diffusion molecules and zeolite is developed. Calculation was performed and checked against the results in Nitsche and Wei (1991) and Gorring (1973). Similar result was also obtained in Ruckenstein and Lee(1976). Satisfactory agreement varifies the correctness of this research.
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