The role of the so-called oxygen storage and release capacity (OSC) in promoting the activity of noble metals in the three-way catalysts (TWCs) is critically discussed. It is shown that the promoting effects of CeO2 in the TWCs cannot be attributed to a simple redox type of effect according to the reaction CeO2 .tautm. CeO2 - x + x/2O2, since multiple and sometimes intriguing effects of CeO2 promoter have been obsd., particularly in the latest generation of TWCs contg. modified CeO2-ZrO2 mixed oxides.
On the role of oxygen storage in three-way catalysis / DI MONTE, Roberta; Kaspar, Jan. - In: TOPICS IN CATALYSIS. - ISSN 1022-5528. - STAMPA. - 28:(2004), pp. 47-57. [10.1023/B:TOCA.0000024333.08447.f7]
On the role of oxygen storage in three-way catalysis
DI MONTE, ROBERTA;KASPAR, JAN
2004-01-01
Abstract
The role of the so-called oxygen storage and release capacity (OSC) in promoting the activity of noble metals in the three-way catalysts (TWCs) is critically discussed. It is shown that the promoting effects of CeO2 in the TWCs cannot be attributed to a simple redox type of effect according to the reaction CeO2 .tautm. CeO2 - x + x/2O2, since multiple and sometimes intriguing effects of CeO2 promoter have been obsd., particularly in the latest generation of TWCs contg. modified CeO2-ZrO2 mixed oxides.Pubblicazioni consigliate
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