Leaching of CuO by HNO3 and NH4OH was carried out to study the nature of active species involved in the oxygen-assisted water-gas shift (OWGS) reaction over a highly active CuPd/CeO2 catalyst. Since the CO conversion remained above 99% even after removing significant amount of bulk-like CuO, small CuO clusters dispersed on CeO2 surface and interacting closely with PdO species contributed significantly to the conversion of CO in the OWGS reactions. A significant decrease in the CO conversion over this sample revealed that there is a significant loss in the active species upon NH4OH treatment. The NH4OH treatment removed, in addition to the bulk-like CuO, significant amount of highly dispersed CuO that are responsible for the catalytic activity.
|Original language||English (US)|
|Number of pages||3|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|State||Published - Sep 1 2004|
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