TY - JOUR
T1 - Synergistic catalysis between Pd and Fe in gas phase hydrodeoxygenation of m -cresol
AU - Hong, Yongchun
AU - Zhang, He
AU - Sun, Junming
AU - Ayman, Karim M.
AU - Hensley, Alyssa J.R.
AU - Gu, Meng
AU - Engelhard, Mark H.
AU - McEwen, Jean Sabin
AU - Wang, Yong
N1 - Publisher Copyright:
© 2014 American Chemical Society.
PY - 2014/10/3
Y1 - 2014/10/3
N2 - In this work, a series of Pd/Fe2O3 catalysts were synthesized, characterized, and evaluated for the hydrodeoxygenation (HDO) of m-cresol. It was found that the addition of Pd remarkably promotes the catalytic activity of Fe while the product distributions resemble that of monometallic Fe catalyst, showing high selectivity toward the production of toluene (C-O cleavage without saturation of aromatic ring and C-C cleavage). Reduced catalysts featured with Pd patches on the top of reduced Fe nanoparticle surface, and the interaction between Pd and Fe, was further confirmed using X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray absorption near edge fine structure (XANES). A possible mechanism, including Pd assisted H2 dissociation and Pd facilitated stabilization of the metallic Fe surface as well as Pd enhanced product desorption, is proposed to be responsible for the high activity and HDO selectivity in Pd-Fe catalysts. The synergic catalysis derived from Pd-Fe interaction found in this work was proved to be applicable to other precious metal promoted Fe catalysts, providing a promising strategy for future design of highly active and selective HDO catalysts.
AB - In this work, a series of Pd/Fe2O3 catalysts were synthesized, characterized, and evaluated for the hydrodeoxygenation (HDO) of m-cresol. It was found that the addition of Pd remarkably promotes the catalytic activity of Fe while the product distributions resemble that of monometallic Fe catalyst, showing high selectivity toward the production of toluene (C-O cleavage without saturation of aromatic ring and C-C cleavage). Reduced catalysts featured with Pd patches on the top of reduced Fe nanoparticle surface, and the interaction between Pd and Fe, was further confirmed using X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray absorption near edge fine structure (XANES). A possible mechanism, including Pd assisted H2 dissociation and Pd facilitated stabilization of the metallic Fe surface as well as Pd enhanced product desorption, is proposed to be responsible for the high activity and HDO selectivity in Pd-Fe catalysts. The synergic catalysis derived from Pd-Fe interaction found in this work was proved to be applicable to other precious metal promoted Fe catalysts, providing a promising strategy for future design of highly active and selective HDO catalysts.
KW - H sticking probability
KW - bimetallic catalysis
KW - biomass conversion
KW - hydrodeoxygenation
KW - iron catalyst
KW - noble metal catalysis
KW - synergistic effects
UR - http://www.scopus.com/inward/record.url?scp=84907808840&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84907808840&partnerID=8YFLogxK
U2 - 10.1021/cs500578g
DO - 10.1021/cs500578g
M3 - Article
AN - SCOPUS:84907808840
SN - 2155-5435
VL - 4
SP - 3335
EP - 3345
JO - ACS Catalysis
JF - ACS Catalysis
IS - 10
ER -