Preparation and characterization of Co mordenite coatings onto cordierite monoliths as structured catalysts
✍ Scribed by M.A. Ulla; R. Mallada; L.B. Gutierrez; L. Casado; J.P. Bortolozzi; E.E. Miró; J. Santamaría
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 977 KB
- Volume
- 133-135
- Category
- Article
- ISSN
- 0920-5861
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✦ Synopsis
Mordenite coatings onto the walls of cordierite monoliths were obtained by hydrothermal synthesis followed by cationic exchange. A battery of characterization techniques was used to describe the structured catalyst so obtained, and selective catalytic reduction (SCR) of NO with CH 4 in excess O 2 was used as a reaction test. A homogeneous distribution of the different components on the synthesized mordenite layer was obtained, with a Si/Al ratio lower than that of synthesis gel, suggesting aluminium transference from the substrate to the zeolite during the synthesis procedure; however, this effect was not observed for Mg. TPR results indicated that Co species in mordenite were exchanged Co 2+ , highly dispersed CoO x , and hydroxo-Co with a small contribution of Co 3 O 4 . The existence of different Co 2+ sites is supported by NO desorption tests. Catalytic performance was fairly comparable to that of powdered Co-mordenite.