Yruela Garrido, MartaMartín Rodríguez, NuriaCastillejos López, EvaCampos Castellanos, EduardoConesa, José MaríaRodríguez Ramos, InmaculadaGuerrero Ruiz, Antonio R2025-02-102025-02-102024-07-27M. Yruela-Garrido, N. Martín-Rodríguez, E. Castillejos, E. Campos-Castellanos, J. M. Conesa, I. Rodríguez-Ramos, A. Guerrero-Ruiz, ChemCatChem 2024, 16, e202400897. https://doi.org/10.1002/cctc.2024008971867-3899https://doi.org/10.1002/cctc.202400897https://hdl.handle.net/20.500.14468/25879The registered version of this article, first published in ChemCatChem, is available online at the publisher's website: Wiley, https://doi.org/10.1002/cctc.202400897La versión registrada de este artículo, publicado por primera vez en ChemCatChem, está disponible en línea en el sitio web del editor: Wiley, https://doi.org/10.1002/cctc.202400897Commercial high surface area graphite (HSAG300) and commercial TiO2 were used to produce composite materials through a simple mechanochemical method involving milling and ultrasonic treatments. The acid and basic sites exposed on the surfaces of these materials were characterized by temperature-programmed desorption (TPD) of ammonia and carbon dioxide. The catalytic materials were tested in the dehydration reaction of formic acid to produce hydrogen-free CO. While HSAG300 is practically inactive under reaction conditions (continuous gas flow at temperatures in the range of 100–250 °C), all samples containing TiO2 are active, exhibiting high selectivity to CO without significant deactivation at moderate reaction temperatures. It is demonstrated that the presence of graphite in the catalysts enhances the specific catalytic activity of TiO2. Assuming that the dehydration reaction is catalyzed by acid sites on the TiO2 surfaces, a comparative evaluation of the surface sites reveals that the graphite-TiO2 interactions not only change the density of surface sites but also modify the strength of the acid centers of TiO2. In summary, the interaction of HSAG300 with TiO2 modulates the surface properties of the prepared composite catalysts, decreasing the total number of basic surface sites and increasing the strength of acidic sites compared to bare TiO2.eninfo:eu-repo/semantics/openAccess23 Químicaartículoformic aciddehydrationcarbon dioxide TPDTiO2 catalystsgraphite support