The effect of dimensions (particle size distribution) on catalytic activity can be an interesting subject of research. Does morphology and particle size (particle size distribution) have a significant impact on catalytic activity, or is it just the catalyst-specific compound (chemical composition) that plays the main role?
Generally, the catalytic activity is related to the active surface area of the particle. Thus, the smaller and more anisotropic the particle, the more surface area available, and catalytic sites.
Yes, I agree with Rebeca. Given the same weight of catalytic powder The smaller the particle, the more surface area there is. GENERALLY SPEAKING, the more surface area available for reactions, the faster the reaction SHOULD be, baring other limitations that could, in theory, be tied to either the catalysis or the bulk material itself, or any other limitation to the reaction, such as non-mixing of the two reactants.
Particle size characterization is highly relevant, as pointed out above. Not only is it connected to the active surface area, but also to the fluidization behaviour, cohesion rate, and elutriation rate of catalysts. To get a broad picture of how these characteristics are interrelated and how they can be characterized, you can have a look here:
https://www.anton-paar.com/corp-en/services-support/document-finder/application-reports/catalyst-characterization-from-fresh-to-spent-3/
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