The relationship between reaction temperature and carbon deposition on nickel catalysts based on al2o3, zro2 or sio2 supports during the biogas dry reforming reaction

Charisiou, Nikolaos D. ; Douvartzides, Savvas L. ; Siakavelas, Georgios I. ; Tzounis, Lazaros ; Sebastian, Victor (Universidad de Zaragoza) ; Stolojan, Vlad ; Hinder, Steven J. ; Baker, Mark A. ; Polychronopoulou, Kyriaki ; Goula, María A.

Resumen: The tackling of carbon deposition during the dry reforming of biogas (BDR) necessitates research of the surface of spent catalysts in an effort to obtain a better understanding of the effect that different carbon allotropes have on the deactivation mechanism and correlation of their formation with catalytic properties. The work presented herein provides a comparative assessment of catalytic stability in relation to carbon deposition and metal particle sintering on un-promoted Ni/Al2O3, Ni/ZrO2 and Ni/SiO2 catalysts for different reaction temperatures. The spent catalysts were examined using thermogravimetric analysis (TGA), Raman spectroscopy, high angle annular dark field scanning transmission electron microscopy (STEM-HAADF) and X-ray photoelectron spectroscopy (XPS). The results show that the formation and nature of carbonaceous deposits on catalytic surfaces (and thus catalytic stability) depend on the interplay of a number of crucial parameters such as metal support interaction, acidity/basicity characteristics, O2– lability and active phase particle size. When a catalytic system possesses only some of these beneficial characteristics, then competition with adverse effects may overshadow any potential benefits.

Idioma: Inglés

DOI: 10.3390/catal9080676

Año: 2019

Publicado en: CATALYSTS 9, 8 (2019), 676 [22 pp]
ISSN: 2073-4344

Factor impacto JCR: 3.52 (2019)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 65 / 159 = 0.409 (2019) - Q2 - T2

Factor impacto SCIMAGO: 0.722 - Physical and Theoretical Chemistry (Q2) - Catalysis (Q3)

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)