Hydrodeoxygenation of guaiacol over carbon-supported molybdenum nitride catalysts: Effects of nitriding methods and support properties

I. Tyrone Ghampson, Catherine Sepúlveda, Rafael Garcia, Ljubisa R. Radovic, J. L.García Fierro, William J. Desisto, Nestor Escalona

Research output: Contribution to journalArticlepeer-review

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Abstract

Molybdenum nitride catalysts supported on activated carbon materials with different textural and chemical properties were synthesized by nitriding supported Mo oxide precursors with gaseous NH 3 or N 2/H 2 mixtures using a temperature-programmed reaction. The supports and catalysts were characterized by N 2 physisorption, XRD, chemical analysis, TPD, FT-IR and XPS. Guaiacol (2-methoxyphenol) hydrodeoxygenation (HDO) activities at 5 MPa and 300 °C were evaluated in a batch autoclave reactor. Molybdenum nitrides prepared using a N 2/H 2 mixture resulted in more highly dispersed catalysts, and consequently more active catalysts, relative to those prepared using ammonolysis. The HDO activity was also related to pore size distribution and the concentration of oxygen-containing surface groups of the different carbon supports. Increased mesoporosity is argued to have facilitated the access to active sites while increased surface acidity enhanced their catalytic activity through modification of their electronic properties. The highest activity was thus attributed to the highest dispersion of the unsaturated catalyst species and the highest support mesoporosity. Surprisingly, addition of Co did not improve the HDO activity.

Original languageEnglish (US)
Pages (from-to)111-124
Number of pages14
JournalApplied Catalysis A: General
Volume439-440
DOIs
StatePublished - 2012

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

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