کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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42588 | 45932 | 2009 | 4 صفحه PDF | دانلود رایگان |
Pt–Fe/mordenite (4 wt% Pt–0.5 wt% Fe) powder catalysts were wash-coated onto ceramic straight-channel monoliths by using silica- and/or alumina-sol as a binder, and were evaluated for the preferential oxidation of carbon monoxide (PROX) in a hydrogen-rich gas. In a synthetic reformate gas (1% CO, 1% O2, 5% H2O, 20% CO2, and balance H2), the CO concentration was reduced to less than 20 ppm at temperatures ranging from 100 to 130 °C. After a certain period of the PROX reaction, condensation of H2O in the pores of the mordenite-support occurred over the monolithic catalyst, which was wash-coated with alumina-sol, in the lower temperature range (100–120 °C), resulting in a rapid increase in CO concentration. The monolithic catalyst wash-coated with silica-sol, however, showed an excellent tolerance against H2O condensation and offered a stable catalytic performance, maintaining a CO concentration of ca. 20 ppm for 200 h. The H2O-tolerant characteristic was attributed to the relatively small adsorption amount of H2O over the silica-modified monolithic catalyst.
The monolithic catalyst wash-coated with silica-sol showed an excellent tolerance against H2O condensation and offered a stable catalytic performance, maintaining a CO concentration of ca. 20 ppm for 200 h.Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 370, Issues 1–2, 30 November 2009, Pages 50–53