Combined dip-coating/spin-coating depositions on ceramic honeycomb monoliths for structured catalysts preparation

Riccardo Balzarotti, Cinzia Cristiani, Lorraine F Francis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This work focuses on the investigation of a combined dip-coating/spin-coating technique as novel deposition procedure for structured catalysts production; it consists in the use of a spin-coater device to remove the excess slurry entrapped in structured supports porosity after the dip-coating procedure, by centrifugation. In particular, ceramic monoliths (500 cells per square inch, diameter 1 cm, length 1.5 cm) were chosen as a model support and cerium oxide as a catalyst carrier. The support was selected based on its potential in the syngas production field. A preliminary analysis of the deposition conditions was performed by using water/glycerol solutions of various compositions to investigate a broad range of model liquid viscosities. The influence of coating parameters, such as rotation speed and rotation time, on coating thickness was assessed and optimal conditions for washcoat deposition were identified. Then, a cerium oxide carrier layer was deposited by means of slurry coating route. In particular, an acid-free formulation based on water, glycerol and polyvinyl alcohol was used as liquid medium for the ceramic particles dispersion. Washcoat loads in the 10 wt.% range were obtained after four consecutive depositions. Results were evaluated in terms of coating load and adhesion performance. Moreover, a comparison with similar samples obtained by solely using dip-coating was carried out. Washcoat layers of 11 and 5 μm were found for dip-coated and spin-coated samples, respectively. Additionally, the use of spin coating allowed an improvement in both results reproducibility and washcoat adhesion.

Original languageEnglish (US)
Pages (from-to)90-95
Number of pages6
JournalCatalysis Today
Volume334
DOIs
StatePublished - Aug 15 2019

Fingerprint

Spin coating
Coatings
Catalysts
Catalyst supports
Glycerol
Cerium
Adhesion
Polyvinyl Alcohol
Viscosity of liquids
Coating techniques
Centrifugation
Water
Oxides
Polyvinyl alcohols
Porosity
Acids
Liquids
Chemical analysis

Keywords

  • Catalyst deposition
  • Ceramic monoliths
  • Rheology
  • Spin coating
  • Washcoating

Cite this

Combined dip-coating/spin-coating depositions on ceramic honeycomb monoliths for structured catalysts preparation. / Balzarotti, Riccardo; Cristiani, Cinzia; Francis, Lorraine F.

In: Catalysis Today, Vol. 334, 15.08.2019, p. 90-95.

Research output: Contribution to journalArticle

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