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NO x Reduction Characteristics for Different Composition Ratios of Pt/Al 2 O 3 , Rh/Al 2 O 3 Catalyst Mixtures Using Model Gas as Reformates
Author(s) -
Chung Jinhwa,
Lim Suchol,
Ha Jongju,
Song Soonho,
Chun Kwangmin
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090190
Subject(s) - chemistry , catalysis , composition (language) , nitrogen , selective catalytic reduction , metal , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , organic chemistry , philosophy , linguistics
This study investigated the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) with hydrocarbon in the presence of excess oxygen using various composition ratios of Pt/Al 2 O 3 , Rh/Al 2 O 3 catalyst mixtures. The composition ratios were 1:1, 1:2, 2:1, 1:3 and 3:1 of 1 wt% Pt/Al 2 O 3 and Rh/Al 2 O 3 , which are known to exhibit efficient NO x reduction at low and high temperatures among the noble metal catalysts. Experiments conducted on a single reductant revealed that more efficient NO x conversion could be obtained when Pt/Al 2 O 3 and Rh/Al 2 O 3 were mixed at a ratio of 3:1, rather than 1:1 or 1:3. In a single reductant condition, C 3 H 6 800 ppm (2400 ppmC 1 ) and 400 ppm (1200 ppmC 1 ) exhibited 50% and 38% NO x conversion efficiency at 200°C, respectively. However, NO x conversion efficiency gradually decreased when temperatures were increased above 250°C. With regard to Pt/Al 2 O 3 and Rh/Al 2 O 3 ratio, higher ratios of Rh/Al 2 O 3 activated this Pt+Rh/Al 2 O 3 catalyst in the high temperature range.