Shadowing Effect in Catalyst Activity: Experimental Observation

doi:10.1021/acscatal.2c00818

Shadowing Effect in Catalyst Activity: Experimental Observation

2022-04-22

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Nadadur Veeraraghavan Srinath

DOI：10.1021/acscatal.2c00818

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Abstract

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The influence of the spatial distribution of catalyst particles in a fixed bed reactor on the observed reaction rates has historically been of central interest in catalysis and chemical physics. Results from both fields suggest that the apparent catalyst activity is determined by the distance between active particles and transport phenomena, although a universal understanding of their combined influence remains incomplete. In this study, pulse experiments under contrasting transport regimes show that a given amount of catalyst particles exhibits higher activity with increasing degrees of separation. This is attributed to a shadowing effect induced by the competition between closely neighboring active particles, which limits their combined apparent activity. Experimental results also suggest the dependence of this effect on mass transport phenomena within the reactor space.

Keywords:

CO oxidation

pulse experiment

heterogeneous catalysis

transient kinetics

spatial configuration

reaction-diffusion systems

Shadowing Effect in Catalyst Activity: Experimental Observation

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