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# Pd ion substituted $CeO_2$: A superior $de-NO_x$ catalyst to Pt or Rh metal ion doped ceria

Roy, Sounak and Hegde, MS (2008) Pd ion substituted $CeO_2$: A superior $de-NO_x$ catalyst to Pt or Rh metal ion doped ceria. In: Catalysis Communications, 9 (5). pp. 811-815.

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## Abstract

Pd, Pt and Rh ion doped $CeO_2$, $Ce_{1-x}M_xO_{2-\delta}$(M = $Pd^{2+}$, $Pt^{2+}$, $Rh^{3+}$) were synthesized by solution combustion synthesis method and the $deNO_x$ activity was investigated by NO + CO reaction. Ionically dispersed Pd in $CeO_2$ was found to have better catalytic activity than ionically dispersed Pt or Rh in $CeO_2$. High rates of NO conversion and high selectivity of $N_2$ is observed over $Ce_{0.98}Pd_{0.02}O_{2-\delta}$. A bi-functional reaction mechanism is proposed, which fits very well with the experimental results. The oxide ion vacancy present in the $CeO_2$ matrix seems to play an important role for product selectivity and high rate of reaction.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Ionic substitution;de-NOx;Rate;N2 selectivity;Kinetic modeling. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 18 Aug 2008 19 Sep 2010 04:49 http://eprints.iisc.ernet.in/id/eprint/15644

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