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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Characterization of vanadium and titanium oxide supported SBA-15
Y Segura1, P Cool, P Kustrowski
1Department of Chemistry, Laboratory of Adsorption and Catalysis, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium. yolanda.segura@ua.ac.be
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Supported vanadium and titanium oxide catalysts were prepared using the molecular designed dispersion (MDD) method on SBA-15. The MDD method ensures dispersed metal oxide species, crucial for selective catalytic reduction (SCR) applications.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Developing efficient catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NOx) is critical for environmental remediation.
- Mesoporous silica materials like SBA-15 offer high surface area and tunable pore structures for catalyst support.
- The molecular designed dispersion (MDD) method provides a route to achieve well-dispersed active metal species on supports.
Purpose of the Study:
- To prepare supported vanadium oxide (VO(x)) and titanium oxide (TiO(x)) catalysts on SBA-15 using the MDD method.
- To investigate the influence of deposition method (liquid vs. gas phase) and temperature on catalyst properties.
- To evaluate the catalytic performance of the prepared VO(x)/SBA-15 and TiO(x)/SBA-15 for the selective catalytic reduction (SCR) of NO with ammonia.
Main Methods:
- Preparation of supported catalysts via adsorption and calcination of metal acetylacetonate complexes on SBA-15 using the MDD method.
- Characterization techniques including TGA, FTIR, Raman spectroscopy, in situ transmission IR spectroscopy, XRD, and N2 sorption.
- Catalytic testing for the selective catalytic reduction (SCR) of NO with ammonia.
Main Results:
- Elevated dissolving temperatures in liquid phase deposition led to higher metal loadings on SBA-15 without cluster formation.
- The titanium complex exhibited higher reactivity towards the SBA-15 surface and greater thermal stability compared to the vanadium complex.
- The MDD method successfully produced dispersed VO(x) and TiO(x) species on SBA-15, maintaining structural integrity of the support.
- Catalytic tests for SCR of NO with ammonia were performed on the synthesized materials.
Conclusions:
- The MDD method is effective for preparing highly dispersed supported vanadium and titanium oxide catalysts on SBA-15.
- Catalyst properties, such as metal loading and dispersion, are influenced by deposition conditions (temperature, phase).
- The synthesized VO(x)/SBA-15 and TiO(x)/SBA-15 catalysts show potential for application in the selective catalytic reduction (SCR) of NO.
