Issue 8, 2016
From the journal:

Green Chemistry

Mechanistic investigation of the Zn/Pd/C catalyzed cleavage and hydrodeoxygenation of lignin†

Ian Klein,ab   Christopher Marcum,ab   Hilkka Kenttämaaab  and  Mahdi M. Abu-Omar*abc  

* Corresponding authors

a Brown Laboratory and Negishi Brown Institute for Catalysis, Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
E-mail: mabuomar@purdue.edu

b The Center for Direct Conversion of Biomass to Biofuels (C3Bio), Discovery Park, Purdue University, West Lafayette, IN 47907, USA

c School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA

Abstract

While current biorefinery processes use lignin only for its heat value, the conversion of lignin to high value chemicals is an area of increasing interest. Herein we present a detailed mechanistic study of the hydrodeoxygenation (HDO) of lignin by using a synergistic Pd/C and ZnII catalyst through use of both lignin model compounds and lignocellulosic biomass. Spectroscopic data coupled with the study of lignin model compounds suggest that ZnII activates and facilitates removal of the hydroxyl group at the Cγ position of the β-O-4 ether linkage. Activation is proposed to occur through formation of a six-membered ring complex of ZnII coordinated to the oxygen atoms at Cα and Cγ of the lignin model compound guaiacylglycerol-β-guaiacyl.

Graphical abstract: Mechanistic investigation of the Zn/Pd/C catalyzed cleavage and hydrodeoxygenation of lignin

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Article information

DOI
https://doi.org/10.1039/C5GC01325A
Article type
Paper
Submitted
15 Jun 2015
Accepted
02 Feb 2016
First published
02 Feb 2016

Green Chem., 2016,18, 2399-2405

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Mechanistic investigation of the Zn/Pd/C catalyzed cleavage and hydrodeoxygenation of lignin

I. Klein, C. Marcum, H. Kenttämaa and M. M. Abu-Omar, Green Chem., 2016, 18, 2399 DOI: 10.1039/C5GC01325A

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