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Application of thiolate self-assembled monolayers in selective alcohol oxidation for suppression of Pd catalyst deactivation

Journal Article · · Journal of Catalysis
 [1];  [2];  [3];  [3]
  1. University of Colorado, Boulder, CO (United States); DOE/OSTI
  2. Colorado School of Mines, Golden, CO (United States)
  3. University of Colorado, Boulder, CO (United States)
Rapid deactivation often reduces the effectiveness of Pt-group catalysts in the low-temperature aerobic oxidation of alcohols. We report the use of thiolate self-assembled monolayers (SAMs) as activity promoters in the liquid-phase oxidation of trans-2-hexen-1-ol (HOL) under low air pressure; the oxidation rate was significantly improved, particularly at high conversion, in contrast to the frequently observed activity decrease induced by SAM modification in hydrogenation reactions. Reaction studies indicated that in the regime of low air pressure, catalyst deactivation was mainly caused by the carbonaceous poisons generated from the reaction product 2-hexenal (HAL). Infrared spectroscopy revealed that HAL produced surface residues on Pd that poisoned the catalyst, hypothetically through decarbonylation and dimerization. This poisoning can be suppressed by the SAM modifiers, in a manner that was controllable by varying thiolate surface coverage through use of either 1-adamantanethiol (AT) or 1-octadecanethiol (C18) SAMs.
Research Organization:
University of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0005239
OSTI ID:
1533926
Alternate ID(s):
OSTI ID: 1411079
Journal Information:
Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 344; ISSN 0021-9517
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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