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Hydrodeoxygenation of guaiacol over molybdenum‐based catalysts: The effect of support and the nature of the active site
Author(s) -
Ansaloni Simone,
Russo Nunzio,
Pirone Raffaele
Publication year - 2017
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22819
Subject(s) - guaiacol , hydrodeoxygenation , molybdenum , catalysis , active site , chemistry , organic chemistry , selectivity
The hydrodeoxygenation (HDO) of guaiacol has been chosen as a model process for the upgrading of lignin‐derived bio‐oils. Tests were carried out in a batch reactor at 350 °C, 4000 kPa of H 2 , in the presence of several Mo‐based catalysts prepared by impregnation of ammonium molybdate on SiO 2 , Al 2 O 3 , NaY zeolite, MgO, activated carbon, and graphite. These materials have been characterized by means of: N 2 physisorption, XRD, FESEM/EDS, XPS, TPR‐H 2 , and TPD‐NH 3 , with the aim of correlating the physical and chemical properties of the prepared samples with the resulting features in the HDO reaction. Mo on activated carbon showed the best performances towards guaiacol demethoxylation, exhibiting complete conversion, 72 % of selectivity to phenol, and 19 % to p‐ and o‐cresol. The high surface area and low acidity of activated carbon allow good dispersion of MoO x which exhibits characteristic fragments with a lamellar shape, able to provide a large active surface with localized acidity.