Engineering Catalyst Microenvironments for Metal‐Catalyzed Hydrogenation of Biologically Derived Platform Chemicals1. (4th September 2014)

• Record Type: Journal Article
• Authors: Schwartz, Thomas J.; Johnson, Robert L.; Cardenas, Javier; Okerlund, Adam; Da Silva, Nancy A.; Schmidt‐Rohr, Klaus; Dumesic, James A.
• Is Part Of: Angewandte Chemie. Volume 126:Number 47(2014)
• Page Start: 12932
• Page End: 12936
• Publication Date: 2014-09-04
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201407615
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>It is shown that microenvironments formed around catalytically active sites mitigate catalyst deactivation by biogenic impurities that are present during the production of biorenewable chemicals from biologically derived species. Palladium and ruthenium catalysts are inhibited by the presence of sulfur‐containing amino acids; however, these supported metal catalysts are stabilized by overcoating with poly(vinyl alcohol) (PVA), which creates a microenvironment unfavorable for biogenic impurities. Moreover, deactivation of Pd catalysts by carbon deposition from the decomposition of highly reactive species is suppressed by the formation of bimetallic PdAu nanoparticles. Thus, a PVA‐overcoated PdAu catalyst was an order of magnitude more stable than a simple Pd catalyst in the hydrogenation of triacetic acid lactone, which is the first step in the production of biobased sorbic acid. A PVA‐overcoated Ru catalyst showed a similar improvement in stability during lactic acid hydrogenation to propylene glycol in the presence of methionine.</p> </abstract>