Autor(es)

Bezerra, Raquel C. ; Calderan, Felipe V. ; Felicio-Sousa, Priscilla ; Peraca, Carina S. T. ; Quiles, Marcos G. ; Da Silva, Juarez L. F.

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 10, n. 37, p. 14-pg., 2025-09-13.

Resumo

An atomistic understanding of the interactions between the molecules and surfaces is crucial to optimize the catalytic performance in heterogeneous systems. In this investigation, calculations based on density functional theory are used to characterize the adsorption of a set of catalytically motivated molecules (CO, CO2, CH4, NH3, H2O, SO2) on ceria (Ce15O30), zirconia (Zr15O30), and mixed ceria-zirconia (Ce8Zr7O30) nanoclusters, which were selected based on their relevance in a variety of catalytic reactions. To obtain an improved analysis of all optimized adsorbed structures, we developed an automated algorithm to characterize the adsorption modes, covering the orientation and site preferences, based on the combination of Coulomb matrix representations with k-means clustering, using Silhouette scores to define the number of representative structures. From our calculations and analysis, we found that the 6 closest substrate atoms to the adsorbed molecule provide an optimal representation for the characterization of orientation and site preference of the selected molecules. The adsorption modes of CO, CO2, CH4, NH3, H2O, and SO2 were grouped into distinct classes, showing consistent orientation patterns, such as parallel or inclined geometries relative to the substrate. In general, the adsorption process does not induce large deformations in the oxide nanoclusters. In the lowest energy structures, the specific interaction preferences of the molecules with the oxide clusters follow the pattern: CO and NH3 form bonds via lone pairs on the C and N atoms, respectively; CH4 assumes the umbrella configuration; and H2O and SO2 interact through their O atoms. In particular, the SO2 molecule undergoes large changes in the bond angle, indicating a possible deformation toward the SO3 molecule, especially in ceria nanoclusters. With the exception of SO2, all remaining molecules contribute electron density to the substrate upon adsorption, whereas SO2 functions as an electron acceptor (Lewis acid). (AU)

• Processo FAPESP: 21/03357-3 - Estudo computacional da conversão de metano em novos produtos utilizando catalisadores com base em óxido de cério
• Beneficiário: Carina de Souza Teixeira Peraça
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/21401-7 - EMU concedido no processo 2017/11631-2: cluster computacional de alto desempenho - ENIAC
• Beneficiário: Juarez Lopes Ferreira da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 17/11631-2 - CINE: desenvolvimento computacional de materiais utilizando simulações atomísticas, meso-escala, multi-física e inteligência artificial para aplicações energéticas
• Beneficiário: Juarez Lopes Ferreira da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada
• Processo FAPESP: 22/09285-7 - Exploração do espaço químico via aprendizado semissupervisionado para geração de novos materiais
• Beneficiário: Marcos Gonçalves Quiles
• Modalidade de apoio: Auxílio à Pesquisa - Regular