Comparison of the Transport of Aromatic Compounds in Small and Large MFI Particles
Comparison of the Transport of Aromatic Compounds in Small and Large MFI Particles
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DOI：
10.1021/jp907444c
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发表时间：
2009-11-26
影响因子：
3.7
通讯作者：
Lercher, J. A.
中科院分区：
文献类型：
--
作者：
Gobin, O. C.;Reitmeier, S. J.;Lercher, J. A.
本文用频率响应法研究了烷基取代的芳香族分子在两种H-ZSM-5样品中的扩散，这两种样品分别由很小的（< 100 nm）和大的（约3-4 μ m）初级粒子组成。结合完整传输网络的理论模型对实验数据的分析表明，传输过程的细节和速率决定步骤取决于颗粒尺寸。对于大颗粒，晶内扩散是总扩散的速率决定，而对于小颗粒，扩散由表面效应控制。
The diffusion of alkyl-substituted aromatic molecules in two H-ZSM5 samples consisting of very small (< 100 nm) and large (similar to 3-4 mu m) primary particles was investigated by means of the frequency response method. Analysis of the experimental data in combination with the theoretical modeling of the complete transport network shows that the details of the transport processes and the rate determining step depend on the particle size. With large particles, intracrystalline diffusion was rate determining for the overall diffusion, while for the small particles the diffusion was controlled by Surface effects.