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セラミックス基盤工学研究センター年報 = Annual report of the Ceramics Research Laboratory Nagoya Institute of Technology
巻
9
ページ
9 - 22
発行年
2010-03-31
出版者
名古屋工業大学セラミックス基盤工学研究センター
ISSN
13471694
書誌レコードID
AA11625130
著者版フラグ
publisher
内容記述
Ir/SiO2 effectively catalyzed the selective reduction of NO with CO in the presence of O2 and SO2. The most importantcharacteristic was that coexistence of O2 and SO2 is essential for NO reduction to occur. Surface science investigation using Ir(111)single crystal model catalyst revealed that the atomic sulfur is formed via disproportionation of SO2 and reacted with oxygenadsorbed on the surface to form SO2, which desorbs from the surface. Therefore, the iridium surface can revert to its initial metallicstate. The activity of Ir/SiO2 for NO reduction with CO was effectively improved by addition of Ba. The addition of WO3 and Nb2O5into Ir/SiO2 was also found to promote considerably its catalytic activity for NO reduction with CO irrespective of coexisting SO2.From the comparison of catalytic performance and structural characterizations of Ir/WO3/SiO2 catalysts treated under differentconditions, Ir metal species interacting strongly with W oxide (denoted as Ir?WOx) was suspected to be the active site for NOreduction with CO. Ir?WOx species were found to be preferentially created by high-temperature air calcination. The durability ofsupported Ir catalysts was examined. The activity of Ir/WO3/SiO2 was gradually decreased with reaction time, indicating the lowdurability. On the other hand, the initial activity and long-term durability of Ir/WO3/SiO2 was effectively improved by addition ofBa. The Ba/Ir/WO3/SiO2 catalyst in monolithic form showed good performance for NO reduction under the condition of real dieselexhaust.
担持イリジウム触媒上での一酸化炭素を還元剤とするNO選択還元反応
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