کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
75915 49127 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Diffusion of a hydrocarbon mixture in a one-dimensional zeolite channel: An exclusion model approach
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Diffusion of a hydrocarbon mixture in a one-dimensional zeolite channel: An exclusion model approach
چکیده انگلیسی

Zeolite channels can be used as effective hydrocarbon traps. Earlier experiments [K.F. Czaplewski et al., Micropor. Mesopor. Mater. 56 (2002) 55] show that the presence of large aromatic molecules (toluene) block the diffusion of light hydrocarbon molecules (propane) inside the narrow pore of a zeolite sample. As a result, the desorption temperature of propane is significantly higher in the binary mixture than in the single-component case. In order to obtain further insight into these results, we use a simple lattice gas model of diffusion of hard-core particles to describe the diffusive transport of two species of molecules in a one-dimensional zeolite channel. Our dynamical Monte Carlo simulations show that taking into account an Arrhenius dependence of the single-molecule diffusion coefficient on temperature, one can explain many significant features of the temperature programmed desorption profile observed in experiments. However, on a closer comparison of the experimental curve and our simulation data, we find that it is not possible to reproduce the higher propane current than toluene current near the desorption peak seen in experiment. We argue that this is caused by a violation of strict single-file behavior.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 125, Issues 1–2, 1 October 2009, Pages 143–148
نویسندگان
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