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	The measurement of gas diffusivity in porous materials by temporal analysis of products (TAP)
	Li, Wenjun ; Xie, Lanying ; Gao, Lei ; Zhao, Xueliang ; Hu, Rongrong ; Cheng, Yi ; Wang, Dezheng
	2010-05-07 ; 2010-05-07
会议名称	CATALYSIS TODAY ; Air Pollution Abatement Catalysis Symposium (APAC) ; Cracow, POLAND ; Web of Science
关键词	intraparticle diffusivity porous powder TAP reactor diffusivity measurement diffusion NMR DIFFUSIVITIES PULSE RESPONSES CATALYST COEFFICIENTS REACTOR Chemistry, Applied Chemistry, Physical Engineering, Chemical
中文摘要	The pulsing of argon in a temporal analysis of products (TAP) reactor and reactor modeling of the response curves were used to measure the effective intraparticle diffusivities in porous materials. The diffusivity that can be measured is limited: (1) at the low end by intraparticle diffusion being too slow such that just a small fraction of the pulse gets into the pores to give an indistinguishable tail, which only measures that the diffusivity is smaller than an upper limit and (2) at the high end by intraparticle diffusion being too fast such that it gives a constant concentration in the pores, which only measures that the diffusivity is larger than a lower limit. The limits and range are slightly different for different particle and bed dimensions. A 9 mm long packed bed has a sensitive range of about 300-fold where there are discernible changes in the normalized pulse shape .due to diffusivity changes. If small particles of about 50 mu m are used, the range is from 1 x 10(-10) to 3 x 10(-8) m(2)/s, and if large particles of about 500 mu m are used, the range is from 2 x 10(-9) to 5 x 10(-7) m(2)/s. (c) 2006 Elsevier B.V. All rights reserved.
会议录出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/17094]
专题	清华大学
推荐引用方式 GB/T 7714	Li, Wenjun,Xie, Lanying,Gao, Lei,et al. The measurement of gas diffusivity in porous materials by temporal analysis of products (TAP)[C]. 见:CATALYSIS TODAY, Air Pollution Abatement Catalysis Symposium (APAC), Cracow, POLAND, Web of Science.

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