Abstract
The influence of geometrical factors on the efficiency of diffusion-controlled reactive processes that take place on the surface of a porous catalyst particle is studied using the theory of finite Markov processes. The reaction efficiency is monitored by calculating the mean walklength 〈n〉 of a randomly diffusing atom/molecule before it undergoes an irreversible reaction at a specific site (reaction center) on the surface. The three cases (geometries) considered are as follows. First, we assume that the surface is free of defects and model the system as a Cartesian shell (Euler characteristic, Ω = 2) of integral dimension d = 2 and uniform site valency νi = 4. Then, we consider processes in which the diffusing reactant confronts areal defects (excluded regions on the surface); in this case, both d and Ω remain unchanged, but there is a constriction of the reaction space, and the site valencies νi are no longer uniform. Finally, the case of a catalyst with an internal pore structure is studied by modeling ...
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call