A Comment by Matteo Maestri in "Nature Catalysis"
Professor Matteo Maestri, Head of the Department of Energy at the Politecnico di Milano, has published a Comment entitled ‘The active site and its environment’ in Nature Catalysis, one of the most authoritative international scientific journals dedicated to catalysis.
The article offers a perspective on the future directions in catalysis science and engineering. At its core is the idea that understanding catalyst behaviour requires going beyond a description based solely on the active site – namely the material region where chemical reactions take place – and situating it within the reaction environment that determines its behaviour.
This environment emerges already at the molecular scale, through the local structure of the catalyst, the presence and coverage of adsorbed species, their interactions with the active site, and the confinement of reactants within spaces of molecular dimensions, as occurs in microporous materials. It extends further to larger scales, where transport phenomena, temperature and concentration gradients, residence time distributions and reactor fluid dynamics all contribute to determining the local conditions under which the reaction takes place.
The proposed approach is therefore to view the active site and its environment as inseparable aspects of catalysis, coherently linking phenomena ranging from the atomic and molecular scales up to the reactor scale. This integration is essential for moving beyond a predominantly interpretive description of catalytic systems to tools capable of predicting their behaviour under real operating conditions and guiding the design of catalysts, processes and reactors.
The active site remains the fundamental concept through which we understand catalysis. But its nature, identity and behaviour are closely linked to the reaction environment in which it operates – even at the molecular scale – and to the conditions that arise at higher scales, right up to the reactor. The challenge is to link these scales successfully in order to construct a truly predictive description of catalytic technologies.
Matteo Maestri, professor of Chemical and Catalytic Reaction Engineering
Published at the invitation of "Nature Catalysis", this article contributes to the international debate on the future directions of catalysis and confirms the role of the Politecnico di Milano and the Department of Energy in international research on catalysis, contributing to the definition of new perspectives for understanding and designing more efficient and sustainable catalytic processes and technologies.