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Title: Environmentally benign synthesis of a PGM-free catalyst for low temperature CO oxidation

Journal Article · · Applied Catalysis B: Environmental
ORCiD logo [1];  [2];  [2]; ORCiD logo [3];  [2];  [4];  [4];  [2];  [4]; ORCiD logo [5];  [6]; ORCiD logo [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering and Center for Microengineered Materials
  2. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering and Center for Microengineered Materials
  3. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry and Chemical Biology; Jingdezhen Ceramic Inst. (China). Dept. of Material Science and Engineering
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  5. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry and Chemical Biology; Fuzhou Univ. (China). State Key Lab. of Photocatalysis on Energy and Environment, College of Chemistry
  6. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry and Chemical Biology

Dopants enhance the catalytic properties of ceria. However, conventional techniques for synthesizing doped ceria have limitations in terms of structural homogeneity, surface area, and catalytic activity of the resulting oxide. Use of toxic and corrosive chemicals presents further challenges. The sol-gel method described in this work provides a facile approach for incorporating high concentrations of dopants in a uniform, high surface area structure, yielding excellent catalytic activity. Addition of polyvinylpyrrolidone (PVP) complexing agent prevents the segregation of cerium and dopant atoms during synthesis. Surface areas up to 179 m2/g are achieved, which represents a substantial improvement over doped ceria produced through coprecipitation, solution combustion, or melt-synthesis methods. The resulting powders exhibit dramatically improved CO oxidation activity (T90 = 132 °C for 3.2 wt% Cu-CeO2 compared to 274 °C for a 2 wt% Pt-Al2O3 reference catalyst). First principles calculations suggest a Mars Van Krevelen mechanism, which is facilitated by dopants causing oxygen vacancies.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; FG02-05ER15712; FA9550-18-1-0413
OSTI ID:
1608286
Alternate ID(s):
OSTI ID: 1580316
Journal Information:
Applied Catalysis B: Environmental, Vol. 264, Issue C; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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