NO oxidation over $Pt/TiO_2$ catalyst for hybrid fast SCR process = Hybrid 고속 선택적 촉매환원공정을 위한 $Pt/TiO_2$ 촉매에서의 NO 산화특성

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Catalytic oxidation characteristics of NO over Pt-based catalysts supported on TiO2 (anatase, rutile) have been investigated in a fixed bed reactor (8 mm-ID) of mainly 8 % water with various concentrations of oxygen, nitric oxide and nitrogen dioxide. In the given experimental conditions, the rutile supported catalyst seems to be less efficient compared to the anatase supported catalyst. The order of activity for oxidation reaction using all possible parameters is found to be: $Pt (1.6)/TiO_2 (anatase) > Pt (2.4)/TiO_2$ (rutile) due to smaller BET surface area and low porosity in the rutile. Anatase and rutile supports used in this study have also been investigated by the SEM images and found that rutile particles are large and not uniform compared with the anatase particles. On treating these catalysts with different $O_2$ concentrations it is seen that the conversion of NO to $NO_2$ increases with increasing $O_2$ concentration from 3 to 12%, but it levels off at higher concentrations due to the saturation effect of $O_2$ concentration on the active site. The conversion to $NO_2$ decreases with increasing feed concentrations of NO and also decreases by the addition of $NO_2$ to the feed. These both observations suggest that the oxidation of NO on Pt based catalysts is auto-inhibited by the reaction product $NO_2$. Further experiments were performed for the oxidation of CO and $SO_2$ and also their effect on NO oxidation over same catalysts. The activity order of these catalysts for the oxidation of CO and $SO_2$ has also been investigated and it was found that the activity order is the same order as that of NO oxidation. On treating these $Pt/TiO_2$ catalysts with $SO_2$, the catalytic activity of NO oxidation drops dramatically. Moreover it is also observed that anatase supported catalyst is not affected much by $SO_2$ and shows good conversion but rutile based structure is affected too much by $SO_2$. This may be caused by less stability of sulfates o...
Advisors
Kim, Sang-Doneresearcher김상돈researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2005
Identifier
243657/325007  / 020034306
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2005.2, [ x, 87 p. ]

Keywords

rutile; anatase; $SO_2$; CO; NO oxidation; platinumntmpositecessing; 수리학적 체류시간; 백금 반응조; 루타일; 아나타아제; $SO_2$; CO; NO 산화

URI
http://hdl.handle.net/10203/29846
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=243657&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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