NOx storage/reduction catalysts based in cobalt/copper hydrotalcites

✍ Scribed by A.E. Palomares; A. Uzcátegui; A. Corma

• Book ID: 104009980
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 523 KB
• Volume: 137
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.12.137

✦ Synopsis

The use of materials based on hydrotalcites as NO x storage/reduction (NSR) catalysts has been investigated, examining their activity at low temperature and their resistance to poisons such as H 2 O and SO 2 . The results obtained show that catalysts derived from Mg/Al hydrotalcites containing copper or cobalt is active at low temperatures, specially the samples containing 10 or 15% of Co. The addition of 1 wt% of transition metals with redox properties such as Pt, Pd, V and Ru to the hydrotalcite increases its activity because the combination of the redox properties of these metals and the acid-base properties of the hydrotalcite. The best results were obtained with the catalyst derived from a hydrotalcite with a molar ratio Co/Mg/Al = 15/60/25 and containing 1 wt% V. This material shows a higher activity, at low temperatures and in the presence of H 2 O and SO 2 , than a Pt-Ba/Al 2 O 3 reference catalyst.