Higher catalytic activity of nano-Ce1-x-yTixPdyO2-δ compared to nano-Ce1-x PdxO2-δ for CO oxidation and N2O and NO reduction by CO:: Role of oxide ion vacancy

被引：58

作者：

Baidya, Tinku

Marimuthu, A.

Hegde, M. S.

Ravishankar, N.

Madras, Giridhar ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Chem Engn, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

[3] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 02期

关键词：

D O I：

10.1021/jp064565e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nano-Ce0.73Ti0.25Pd0.02O2-delta solid solution, prepared by solution combustion method, has been synthesized. The catalyst has been characterized by XRD, HRTEM and XPS. Synergistic interaction of Pd with Ti/Ce is very strong because of ionic substitution. The reducibility of Ce0.73Ti0.25Pd0.02O2-delta is about 5 times higher compared to that of Ce0.98Pd0.02O2-delta below 140 degrees C. The easy removal of oxygen from the more reducible Ti containing support plays a major role in showing higher catalytic activity of this material for CO oxidation and N2O and NO reduction by CO. The catalyst shows 100% N-2 selectivity above 240 degrees C and high reaction rates compared to other catalysts reported in the literature. It has been shown that oxide ion vacancy creation in the support promotes the adsorption and dissociation of NO or N2O at a lower temperature. Kinetic models based on a bifunctional mechanism were used to determine the reaction rate coefficients.

引用

页码：830 / 839

页数：10

共 31 条

[1] Enhanced reducibility of Ce1-xTixO2 compared to that of CeO2 and higher redox catalytic activity of Ce1-x-yTixPtyO2-δ compared to that of Ce1-xPtxO2-δ [J].