Hydrodeoxygenation of m-Cresol Over Pt-WOx/C Using H2 Generated In Situ by n-Hexane Dehydrogenation
- 88 Downloads
Hydrodeoxygenation (HDO) of m-cresol using H2 produced by dehydrogenation of n-hexane to hexenes is demonstrated at 673 K over a Pt-WOx/C catalyst at 36 bar. The reaction is possible because deactivation of Pt/C during n-hexane dehydrogenation is greatly suppressed at higher pressures. Flow-reactor measurements of pure n-hexane over Pt/C showed rapid deactivation at 1 bar and 773 K but the catalyst was stable for at least 5 h at 36 bar. While the Pt/C catalyst showed poor activity for HDO of m-cresol, the Pt-WOx/C catalyst was able to utilize the H2 to selectively catalyze m-cresol to toluene, simultaneously pushing the conversion of n-hexane above the equilibrium value that would be achieved in the absence of H2 consumption. To explain the increased stability for alkane dehydrogenation at higher pressures, a microkinetic model of propane dehydrogenation, a surrogate of hexane, was analyzed. The model demonstrates that the coverage of vacancies increases with increasing pressure at the expense of species believed to be coke precursors.
KeywordsHydrodeoxygenation Dehydrogenation Hydrogen donor m-Cresol n-Hexane Pt W
We acknowledge support from the Catalysis Center for Energy Innovation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001004.
Catalysis Center for Energy Innovation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001004.
Compliance with Ethical Standards
Conflict of interest
The authors declare no conflict of interest.
- 20.Wittreich GR, Gu GH (2018) Python Group additivity: Databas and Libraries. In: PyPi. https://pypi.org/project/pGrAdd/
- 21.Lym J, Wittreich GR (2018) pMuTT · PyPI. https://pypi.org/project/pMuTT/. Accessed 10 Dec 2018
- 25.Coltrin ME, Kee RJ, Rupley FM, Meeks E (2000) SURFACE CHEMKIN: a software package for the analysis of heterogeneous chemical kinetics at a solid-surface—gas-phase interface. Chemkin Collection Release 36Google Scholar
- 36.Shin JW, Yoo KS, Park SY, Song KS (2006) Characteristics of n-hexane adsorption over heat-treated activated carbon. J Ind Eng Chem 12:418–424Google Scholar