Use of Double Wash-Coatings of Platinum and Zeolite Catalysts to Improve Selective Reduction of NOx by Hydrocarbons |
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| Authors: | Akaratiwa Somchai Nanba Tetsuya Obuchi Akira Okayasu Jun Uchisawa Junko-Oi Kushiyama Satoshi |
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| Affiliation: | (1) Department of Chemical Engineering, Mahanakorn University of Technology, 51 Cheum-Sampan Rd, Nong Chok, Bangkok, 10530, Thailand;(2) National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, 305-8569, Japan |
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| Abstract: | The selective catalytic reduction by hydrocarbons (HC-SCR) of NOx under lean conditions has been improved by the use of double-layered catalysts with a lower layer of Pt/SiO2 and an upper layer of a zeolite such as H-, Ce-, and Cu-ferrierite (-FER). H-FER wash-coated over Pt/SiO2 (H-FER//Pt/SiO2) performed best among the samples examined. The promotional effect was attributed to the synergy of the oxidation catalyst (Pt/SiO2) in converting NO into NO2, which is more reactive to C3H6, and the HC-SCR catalyst (H-FER). Cu-FER//Pt/SiO2 was also effective at widening the temperature window, but with this combination the performance was attributed to a simple summation of the activity of two HC-SCR catalysts that were active at different temperatures. |
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| Keywords: | NOx selective catalytic reduction hydrocarbon zeolites Pt honeycomb |
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