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Published on: May 29, 2018
Surface stabilized nanosized Ce(x)Zr(1-x)O(2) solid solutions over SiO(2): characterization by XRD, Raman, and HREM
Benjaram M Reddy1, Pandian Lakshmanan, Ataullah Khan
1Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India. bmreddy@iict.res.in
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Silica-supported cerium-zirconium oxide (CZ/S) catalysts exhibit enhanced thermal stability and oxygen vacancy concentration compared to unsupported catalysts. These findings highlight the crucial role of silica support in improving the performance of composite oxide materials.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Cerium-zirconium oxides (Ce(x)Zr(1-x)O2) are advanced materials with tunable properties.
- The role of support materials in stabilizing and enhancing the performance of oxide catalysts is critical.
- Understanding the thermal stability of composite oxides is essential for their practical applications.
Purpose of the Study:
- To investigate the structural properties and thermal stability of silica-supported cerium-zirconium oxide (CZ/S) solid solutions.
- To elucidate the influence of a silica support on the characteristics of Ce(x)Zr(1-x)O2.
- To compare the performance of supported and unsupported Ce(x)Zr(1-x)O2 catalysts.
Main Methods:
- Synthesis of supported (CZ/S) and unsupported (CZ) Ce(x)Zr(1-x)O2 catalysts.
- Characterization using X-ray diffraction (XRD), Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM).
- Thermal treatments at temperatures ranging from 773 to 1073 K.
- Oxygen storage capacity (OSC) measurements using thermogravimetric analysis.
Main Results:
- XRD confirmed the presence of cubic phases in both CZ and CZ/S samples, with crystallinity increasing upon calcination.
- Raman spectroscopy indicated oxygen vacancies and lattice defects in both sample types.
- HREM revealed well-dispersed nanosized Ce-Zr-oxides on the amorphous silica surface in CZ/S samples.
- CZ/S samples demonstrated superior thermal stability and a significantly enhanced oxygen vacancy concentration compared to unsupported CZ.
Conclusions:
- The silica support plays a crucial role in dispersing and stabilizing nanosized Ce-Zr-oxide crystals.
- CZ/S composite oxides exhibit improved structural integrity and higher oxygen vacancy concentrations, leading to enhanced performance.
- These findings suggest that silica-supported cerium-zirconium oxides are promising candidates for catalytic applications requiring high thermal stability and oxygen mobility.
