TY - JOUR
T1 - Influence of calcination on metallic dispersion and support interactions for NiRu/TiO 2 catalyst in the hydrodeoxygenation of phenol
AU - Valdés-Martínez, O. U.
AU - Santolalla-Vargas, C. E.
AU - Santes, V.
AU - de los Reyes, J. A.
AU - Pawelec, B.
AU - Fierro, J. L.G.
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Bio-oil upgrading by hydrotreatment has been considered as a renewable route for fuels production and potential substitutes for fossil oil distillates. Traditional hydrodesulfurization catalysts (sulfided CoMo and NiMo) used in petroleum refining have been evaluated in hydrodeoxygenation reactions with high selectivity to aromatics. However, significant deactivation has been commonly observed, due to the low sulfur content in bio-oil. Thus, the development of different active and stable catalytic materials is needed. In this regard, we have previously reported a synergetic effect between Ni and Ru bimetallic materials supported on Al 2 O 3 , TiO 2 and ZrO 2 in phenol HDO with promising activity and selectivity results. In particular, materials supported TiO 2 on displayed the highest activities. Therefore, the aim of this work was to evaluate the effect of calcination on dispersion and metal-support interactions and their impact on activity and selectivity for NiRu/TiO 2 catalysts in HDO of phenol as a model compound for bio oil. Catalysts were characterized by hydrogen chemisorption, Temperature- programmed reduction, X-ray photoelectron spectroscopy, High resolution electron microscopy. Additionally, hydrogenation of benzene was used as a structure unsensitive reaction in order to obtain more information about metallic dispersion. A highly active NiRu catalyst was obtained when calcination was avoided prior to reduction. The calcination procedure induced the formation of metallic oxides and it provoked less dispersed NiRu species as compared with catalysts without this previous treatment. On the contrary, the formation of metallic species from direct reduction of precursor salts contributed to produce highly dispersed species.
AB - Bio-oil upgrading by hydrotreatment has been considered as a renewable route for fuels production and potential substitutes for fossil oil distillates. Traditional hydrodesulfurization catalysts (sulfided CoMo and NiMo) used in petroleum refining have been evaluated in hydrodeoxygenation reactions with high selectivity to aromatics. However, significant deactivation has been commonly observed, due to the low sulfur content in bio-oil. Thus, the development of different active and stable catalytic materials is needed. In this regard, we have previously reported a synergetic effect between Ni and Ru bimetallic materials supported on Al 2 O 3 , TiO 2 and ZrO 2 in phenol HDO with promising activity and selectivity results. In particular, materials supported TiO 2 on displayed the highest activities. Therefore, the aim of this work was to evaluate the effect of calcination on dispersion and metal-support interactions and their impact on activity and selectivity for NiRu/TiO 2 catalysts in HDO of phenol as a model compound for bio oil. Catalysts were characterized by hydrogen chemisorption, Temperature- programmed reduction, X-ray photoelectron spectroscopy, High resolution electron microscopy. Additionally, hydrogenation of benzene was used as a structure unsensitive reaction in order to obtain more information about metallic dispersion. A highly active NiRu catalyst was obtained when calcination was avoided prior to reduction. The calcination procedure induced the formation of metallic oxides and it provoked less dispersed NiRu species as compared with catalysts without this previous treatment. On the contrary, the formation of metallic species from direct reduction of precursor salts contributed to produce highly dispersed species.
KW - Calcination
KW - Dispersion
KW - Hydrodeoxygenation
KW - Nickel-ruthenium
KW - Phenol
UR - http://www.scopus.com/inward/record.url?scp=85057234686&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2018.11.007
DO - 10.1016/j.cattod.2018.11.007
M3 - Artículo
SN - 0920-5861
VL - 329
SP - 149
EP - 155
JO - Catalysis Today
JF - Catalysis Today
ER -
