Zeolite washcoating onto cordierite honeycomb reactors for environmental applications
By J. M. Zamaro, M. Ulla, E. Miró. 2005
137 citations recorded by the source corpus.
Abstract The preparation conditions to obtain zeolite washcoats with optimum loading and homogeneous distribution are studied for mordenite, ferrierite and ZSM5. The slurry concentration and the number of immersions were combined to obtain different coating thickness and geometry. The solid concentration increases the viscosity of the slurry resulting in an exponential growth of the zeolite loading. In order to obtain more homogeneous washcoatings it is preferable to use diluted suspensions and perform more than one immersion. It was found that the washcoating adherence increases with the decrease in the size of the aggregates deposited on the monolith. This improves the packaging and interaction between particles and facilitates a convenient filling of the surface cordierite macropores, producing a more effective anchorage. In this vein, the order of washcoat stability tested with an ultrasound method is ZSM5 > mordenite > ferrierite. The addition of SiO 2 as a binder improves the adherence of the three zeolites under study probably due to an improvement in the interparticle cohesion. The performance of an In-ZSM5 washcoated monolith was tested for the selective reduction of NO x with methane under oxygen excess. It was observed that the activity of the monolithic catalyst was as good as those for the In-ZSM5 powder, which indicates that there are no diffusive restrictions due to coating thickness.
Subfields: Catalysis, Inorganic Chemistry, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/bf6b7b45121ce0924cc4895bc455bdf0e59b63f4
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In Catalysis
In Inorganic Chemistry
In Materials Chemistry
Citations in the corpus
- Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation (2017, background): “The particle size of zeolites, as well as slurry concentration, can also influence the adherence [142,145].”