Effect of Secondary Pore Distribution on Adsorption Rate and Stability of Molding 5A Zeolite

Yun Tang; Xu Dong Du; Qun Cun

doi:10.4028/www.scientific.net/AMR.634-638.736

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 634-638Effect of Secondary Pore Distribution on...

Effect of Secondary Pore Distribution on Adsorption Rate and Stability of Molding 5A Zeolite

Abstract:

Equilibrium adsorption capacity and adsorption rate of n-hexane on 5A zeolites(A-1~A-3) were measured by gravimetric method. The carbon depositions after intensification were studied by TG-DTA. Results show that secondary pores of A-1~A-3 distribute in 0.01~0.5μm, 0.05~5μm, 0.01~0.05μm. A-3 has the minimum average pore size and pore volume .The diffusion time constant of n-hexane on A-1 and A-3 are 4.004×10^-4, 2.038×10^-4 s^-1, are 14.8 and 7.5 times that on A-2, respectively. The decay rate of n-hexane adsorption capacity and the coke deposition amount on A-1 are 28% and 0.06% less than these on A-2, while the both on A-3 are the smallest (41% and 6.67%), after five times intensification under industrial hexane at 400 °C. Appropriate adjustment of secondary pores of 5A zeolites, to raise the proportion of the pores about 0.01 ~ 0.05μm, can improve diffusion rate of adsorbates, adsorption stability and service life of 5A zeolites.

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Periodical:

Advanced Materials Research (Volumes 634-638)

Pages:

736-740

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.634-638.736

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Online since:

January 2013

Authors:

Yun Tang, Xu Dong Du, Qun Cun

Keywords:

Coke Deposition, Diffusion, Molding 5A Zeolite, Secondary Pore

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