(A) study on the deactivation and stability of hydrophobic catalyst for hydrogen isotope exchange = 수소동위원소 분리용 소수성 촉매의 활성저하에 관한 연구

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The hydrophobic catalyst has been prepared by deposition of platinum on porous styrene divinylbenzene copolymers(Pt/SDBC) and at the same time a separated type catalytic reactor has been developed for the Wolsong tritium removal facility(WTRF). Several tests carried out to obtain the experimental performance data of the Pt/SDBC with a recycle reactor system. The long-term stability was also measured with the Pt/SDBC catalyst immersed in water for a long time. The long-term deactivations of the Pt/SDBC catalyst were evaluated quantitatively by mathematical models. The simple mathematical models were presented to evaluate the uniform poisoning and shell progressive poisoning to be occurred simultaneously during the hydrogen isotope exchange between hydrogen gas and liquid water in the Liquid Phase Catalytic Exchange(LPCE) column. The uniform poisoning was well characterized by a time on stream theory and then the deactivation parameters were determined from the experimental performance data. The impurity poisoning was derived by a shell progressive model with two-layer mass transfer. The water vapor condensation was a main cause of the reversible uniform poisoning for the Pt/SDBC catalyst. The values of the decay rate constant $(K_d)$ and order of the decay reaction(m) were of 2 and 4, respectively, based on the experimental data. It indicated that the decay might be attributable to pore mouth poisoning. From the long-term stability of the catalyst immersed in water, there was no intrinsic decay of catalyst activity due to waterlogging to the catalyst. The activity decreased by only 7% over 18 months, which was equivalent to a catalyst half-life longer than 15 years. On the basis of the above deactivation parameters, the values for $k_c/k_{c,o}$ with Thiele modulus=20 after 3 years and 10 years of operation were expected about 19% and 15% of the initial activity, respectively, while the values for $k_c/k_{c,o}$ with Thiele modulus=100 were of about 22% and ...
Advisors
Lee, Kun-Jairesearcher이건재researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
254255/325007  / 000955186
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2006.2, [ xiii, 109 p. ]

Keywords

hydrogen isotope separation; catalyst deactivation; Hydrophobic catalyst; tritium removal facility; 삼중수소제거설비; 수소동위원소분리; 촉매활성저하; 소수성촉매

URI
http://hdl.handle.net/10203/48981
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=254255&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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