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	Diffusion limitation in fast transient experiments
	Wang, DZ ; Li, FX ; Zhao, XL
	2010-05-07 ; 2010-05-07
会议名称	CHEMICAL ENGINEERING SCIENCE ; 18th International Symposium on Chemical Reaction Engineering ; Chicago, IL ; Web of Science
关键词	transient response porous media reaction engineering diffusion diffusion limitation pulse reactor TAP REACTOR PULSE RESPONSES DIFFUSIVITIES COEFFICIENTS CATALYSTS KINETICS Engineering, Chemical
中文摘要	Pulsed gas experiments show that during transient experiments on porous particles with response times which are even as slow as the seconds range, intraparticle diffusion is often not fast enough and concentration gradients exist inside the porous powders. This situation is detected when packed beds of different lengths give effective bed diffusivities that change with the bed length or when the use of a long (> 2 cm) packed bed gives a pulse shape for which a good fit cannot be obtained with a reactor model that assumes intraparticle diffusion is fast. The use of very small 200-400 mesh particles shows that intraparticle diffusion control is in the microparticles, and not in the macropores of the interstices between the microparticles of compacted bimodal particles. When intraparticle diffusion in the micropores is controlling, kinetics parameters obtained from transient experiments vary with the length of the packed bed used. (C) 2004 Elsevier Ltd. All rights reserved.
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/17084]
专题	清华大学
推荐引用方式 GB/T 7714	Wang, DZ,Li, FX,Zhao, XL. Diffusion limitation in fast transient experiments[C]. 见:CHEMICAL ENGINEERING SCIENCE, 18th International Symposium on Chemical Reaction Engineering, Chicago, IL, Web of Science.

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