Influence of the ZrO(2)Crystalline Phases on the Nature of Active Sites in PdCu/ZrO(2)Catalysts for the Methanol Steam Reforming Reaction-An In Situ Spectroscopic Study

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020-09

Autores

Ruano, D. (Autor) Outra; Pabón, B.M. (Autor) Outra; Azenha, C. (Autor) Outra; Mateos-Pedrero, C. (Autor) Outra; Adélio Mendes (Autor) FEUP; Pérez-Dieste, V. (Autor) Outra; Concepción, P. (Autor) Outra

Revista

Título: Catalysts

Vol. 10

Páginas: 1-15

ISSN: 2073-4344

Editora: MDPI

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 1 Citação

BASE - Bielefeld Academic Search Engine

Classificação Científica

CORDIS: Ciências Físicas > Química

Projetos Associados

LEPABE - Projeto Estratégico do LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Outras Informações

ID Authenticus: P-00S-QV0

DOI: 10.3390/catal10091005

Abstract (EN): In this work, the electronic properties of the metal sites in cubic and monoclinic ZrO(2)supported Pd and PdCu catalysts have been investigated using CO as probe molecule in in-situ IR studies, and the surface composition of the outermost layers has been studied by APXPS (Ambient Pressure X-ray Photoemission Spectroscopy). The reaction products were followed by mass spectrometry, making it possible to relate the chemical properties of the catalysts under reaction conditions with their selectivity. Combining these techniques, it has been shown that the structure of the support (monoclinic or cubic ZrO2) affects the metal dispersion, mobility, and reorganization of metal sites under methanol steam reforming (MSR) conditions, influencing the oxidation state of surface metal species, with important consequences in the catalytic activity. Correlating the mass spectra of the reaction products with these spectroscopic studies, it was possible to conclude that electropositive metal species play an imperative role for high CO(2)and H(2)selectivity in the MSR reaction (less CO formation).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15