269546 Selective Hydrodeoxygenation of Guaiacol Catalyzed by Pt/MgO

Wednesday, October 31, 2012: 1:50 PM
315 (Convention Center )
Tarit Nimmanwudipong1, Ceren Aydin2, Jing Lu2, Ron C. Runnebaum2, Kevin C. Brodwater2, Nigel D. Browning2, David E. Block3 and Bruce C. Gates4, (1)Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, (2)Chemical Engineering & Materials Science, University of California, Davis, Davis, CA, (3)Department of Chemical Engineering and Materials Science and Department of Viticulture and Enology, University of California Davis, Davis, CA, (4)Chemical Engineering and Materials Science, University of California at Davis, Davis, CA

Selective Hydrodeoxygenation of Guaiacol Catalyzed by Pt/MgO

 

T. Nimmanwudipong, C. Aydin, J. Lu, R. C. Runnebaum, K. Brodwater, N. D. Browning, D. E. Block, and B. C. Gates

The conversion of guaiacol catalyzed by Pt/MgO in the presence of H2 was investigated with a flow reactor at 573 K and 140 kPa.  Among the dozens of reaction products identified by gas chromatography (GC) and GC/mass spectrometry, the predominant ones were phenol, catechol, and (surprisingly) cyclopentanone, and others included methane, n-butane, n-pentane, butenes,  and carbon monoxide. The predominant reactions were hydrodeoxygenation (with about 70% of the total products being reduced in oxygen), but when the catalyst incorporated an acidic support, Pt/g-Al2O3, other reactions became kinetically significant, exemplified by transalkylation, and the selectivity to deoxygenated products was reduced to about half the value observed with Pt/MgO. Pt/MgO underwent deactivation slightly more slowly than Pt/g-Al2O3, consistent with the lower rate of coke formation and with the observations by transmission electron microscopy showing the lack of sintering of the platinum (the average platinum particle size (which was approximately 1–2 nm in each catalyst) did not change significantly during operation.


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