2012
DOI: 10.1246/cl.2013.60
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Promoting Effect of CeO2 on the Catalytic Activity of Rhodium Supported on Y-Stabilized ZrO2 for NO–CO–C3H6–O2 Reactions

Abstract: The catalytic activity of Rh supported on Y-stabilized ZrO2 for NO–CO–C3H6–O2 reactions under stoichiometric conditions was improved by the addition of 5 mol % CeO2, whereas an excess amount of CeO2 of more than 10 mol % caused a decrease in the NO reduction activity. The improvement was ascribed to the formation of easily reducible Rh species through interaction with a Ce–Zr solid solution.

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Cited by 9 publications
(7 citation statements)
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“…The addition of nonstoichiometric rare earth oxide such as Ce, Pr and Tb is suspected to promote the nonselective oxidation of CO and C 3 H 6 by O 2 , because oxygen species arisen from the oxide lattice can be effectively supplied via the Rh-rare earth oxide interface, leading to the stabilization of Rh surface in oxidizing state. In fact, we have recently reported that the addition of excess amount of CeO 2 (20 mol%) into Rh/Y-ZrO 2 caused a shift of lightoff temperature for CO oxidation toward lower temperature region, resulting in the decrease in the utilization of CO for NO reduction [13]. In this study, as seen in Fig.…”
Section: Additive Effect Of Rare Earth On the Twcsupporting
confidence: 54%
“…The addition of nonstoichiometric rare earth oxide such as Ce, Pr and Tb is suspected to promote the nonselective oxidation of CO and C 3 H 6 by O 2 , because oxygen species arisen from the oxide lattice can be effectively supplied via the Rh-rare earth oxide interface, leading to the stabilization of Rh surface in oxidizing state. In fact, we have recently reported that the addition of excess amount of CeO 2 (20 mol%) into Rh/Y-ZrO 2 caused a shift of lightoff temperature for CO oxidation toward lower temperature region, resulting in the decrease in the utilization of CO for NO reduction [13]. In this study, as seen in Fig.…”
Section: Additive Effect Of Rare Earth On the Twcsupporting
confidence: 54%
“…In particular, Rh interactions with Y 2 O 3 helped stabilize the Rh particles in a dispersed state and prevent sintering, thus improving catalytic activity. Haneda et al 41 have also reported that adding 5 mol% CeO 2 to the Rh/Y-ZrO 2 catalyst system further improves performance due to enhanced catalyst reducibility. However, higher levels of Ce reduce performance by allowing for excessively strong Rh-ceria interactions which create stable, inactive oxidized Rh particles.…”
Section: Washcoat Compositionmentioning
confidence: 98%
“…64 It also avoided excessive Rh-Ce or Rh-Al interactions, which can cause the formation of a highly oxidized inactive form of rhodium. 41,65 In contrast to designs with separate metal components, other recent research has shown that some bimetallic alloy designs can improve catalytic performance or stability, not just cause deactivation. Vedyagin et al 66 developed an alloyed 0.2 wt% Pd-Rh/Al 2 O 3 catalyst (Pd:Rh ratio 3:2) which was more stable than an identical catalyst with separate Rh and Pd particles.…”
Section: Additional Considerations For Twc Metal Loadingmentioning
confidence: 99%
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“…From the comparison of the activity of Rh/3Y-ZrO 2 and Rh/3Y/ ZrO 2 , the former catalyst showed higher activity for NO reduction and CO/C 3 H 6 oxidation than the latter one in the temperature range of 200250°C. Since Y-doped ZrO 2 without Rh does not effectively catalyze the TWC reactions, 34) Rh must be the catalytically active component. Therefore, the dispersion state of Rh species is considered to be an important factor affecting the catalytic activity, because catalytic reactions take place on catalyst surfaces.…”
Section: Resultsmentioning
confidence: 99%