fulltext.study @t Gmail

Guaiacol transformation over unsupported molybdenum-based nitride catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41095 45877 2012 7 PDF Available
Title
Guaiacol transformation over unsupported molybdenum-based nitride catalysts
Abstract

Unsupported Mo2N catalysts were prepared by thermal decomposition of ammonium heptamolybdate to form MoO3 followed by nitridation in either flowing ammonia or a N2/H2 mixture. The nitridation was achieved at two different space velocities for each reaction mixture. This resulted in Mo2N catalysts with different surface areas as well as different phases present as were determined by X-ray diffraction (XRD). The activity and selectivity of the catalysts were evaluated for hydrodeoxygenation (HDO) of guaiacol in a batch autoclave at 300 °C and 5 MPa hydrogen pressure. The catalyst prepared with flowing ammonia and a space velocity of 29 h−1 displayed the highest activity (guaiacol conversion) and highest phenol/catechol ratio within the products indicative of HDO activity. This highest activity was attributed to the catalyst containing only γ-Mo2N phase (as measured by XRD) and having the highest N/Mo atomic ratio. An initial attempt to promote this catalyst with Co, similar to that done for hydrodesulfurization and hydrodenitrogenation catalysts was unsuccessful in forming a single phase cobalt molybdenum nitride, however did show modest improvements in the production of deoxygenated compounds, and suggests further studies into this material for HDO catalysis.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (160 K)Download as PowerPoint slideHighlights► Mo2N catalysts prepared under different synthesis conditions. ► The catalysts were characterized and evaluated for hydrodoxygenation of guaiacol. ► Single phase γ-Mo2N had the highest activity for guaiacol conversion. ► Single phase γ-Mo2N had the highest phenol to catechol ratio in the products. ► Co addition increased hydrodeoxygenation products.

Keywords
Hydrodeoxygenation; Guaiacol; Metal nitrides; Activity
First Page Preview
Guaiacol transformation over unsupported molybdenum-based nitride catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 78–84
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis