Abstract
The well-known adsorption integral equation (AIE) for calculating pore size and adsorption energy distributions from adsorption isotherms on porous solids is, from the mathematical point of view, a linear Fredholm integral equation of the first kind and therefore an ill-posed problem. What can we realistically expect from the solution of such an ill-posed problem by regularization? Does it make sense to restrict the number of possible solutions by the so-called ansatz method? In this paper, the two methods for solving ill-posed problems are from scratch explained and illuminated by concrete examples. Their relevance and fundamental limitations are discussed.
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Arnrich, S., Kalies, G. & Bräuer, P. About the limits of regularization and the ansatz method. Adsorption 17, 823–831 (2011). https://doi.org/10.1007/s10450-011-9341-7
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DOI: https://doi.org/10.1007/s10450-011-9341-7