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Influence of coating geometry on the effectiveness of monolithic catalysts

✍ Scribed by Cheng-Tung Chou; Warren E. Stewart

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
265 KB
Volume
41
Category
Article
ISSN
0009-2509

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✦ Synopsis

Monolithic reactors are manufactured by coating a perforated ceramic block with a slurry of the catalytic material. The coatings can be made quite uniform, except that there is a tendency for fillets to form in the comers of the ducts as shown in Fig. 1. This communication is concerned with the influence of these fillets on the effectiveness of the catalytic coating for reactions with linear kinetics.

The support geometry considered here is a honeycomb with straight passages of square cross-section. The support is inert and impervious to diffusion. The cross-section of a typical passage, after deposition of the catalyst, is approximated as a square with rounded comers of radius LI = RA. where A is the half-width of the uncoated hole. In view of the symmetry we consider just one octant of the crosssection, as shown in Fig. 2.

Let t be the ideal (uniform) coating thickness for the given catalyst loading. In typical monoliths, the loading corresponds to r/A k 0.12. We use the nearly equivalent value t/A = 1

πŸ“œ SIMILAR VOLUMES

Effect of cocatalysts on the character o
Effect of cocatalysts on the character of a constrained geometry catalyst
✍ Tetsunosuke Shiomura; Tadashi Asanuma; Tadahiro Sunaga πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 208 KB

## Abstract A constrained geometry catalyst (CGC) precursor, Me~2~Si(Flu)(N‐__t__‐Bu)ZrX~2~ (X = Cl or NMe~2~), behaved as a single site catalyst with methylaluminoxane (MAO) as cocatalyst, while it developed much diversified catalytic species with AIR~3~/Ph~3~CB(C~6~F~5~)~4~ as cocatalyst. The cat