A Career in Catalysis: Gianfranco Pacchioni

This Account traces the scientific journey of Gianfranco Pacchioni, a pioneer in the theoretical understanding of catalysis and materials chemistry. From his early contributions to the study of metal clusters and organometallic compounds to his groundbreaking work on surface defects and single-atom catalysis, Gianfranco has profoundly shaped our understanding of the electronic structure and reactivity of catalytic materials. A defining feature of his career has been his ability to translate chemical complexity into comprehensive and powerful theoretical models, often anticipating experimental findings and guiding the design of catalytic systems. His work on defect engineering, oxide-supported metal clusters, and ultrathin films has laid foundational principles in surface science. At the same time, his more recent contributions have elevated the field of single-atom catalysis through a unique blend of coordination chemistry, solid-state physics, and computational rigor. Gianfranco’s legacy extends beyond his scientific output: he has fostered international collaborations, mentored generations of researchers, and played a pivotal role in shaping the landscape of theoretical chemistry in Italy and beyond.