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Enhancing Au/TiO2 Catalyst Thermostability and Coking Resistance with Alkyl Phosphonic-Acid Self-Assembled Monolayers

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States); University of Colorado Boulder
  2. Univ. of Colorado, Boulder, CO (United States)
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Metal oxide-supported Au catalysts, particularly those with small Au nanoparticles, catalyze a variety of reactions including low-temperature CO oxidation and selective hydrogenation of alkynes. However, the facile nature of Au particle growth at even moderate temperatures poses significant challenges to maintaining catalyst activity under reaction conditions. In this paper, we present a method to reduce the rate of sintering and coke formation in TiO2-supported Au catalysts via the deposition of alkyl-phosphonic acid (PA) self-assembled monolayers. After surface modification with PAs, the resultant catalysts exhibited significantly improved resistance to Au sintering. PA deposition strongly suppressed CO oxidation rates, consistent with poisoning of active sites. In contrast, modification with PAs significantly improved the rate of C2H2 hydrogenation on Au/TiO2. The enhanced activity was accompanied by a dramatically improved resistance to accumulation of surface carbonaceous species.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; US Department of Education
Grant/Contract Number:
SC0005239
OSTI ID:
1658624
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 44 Vol. 11; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (8)

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Table 1(p. 3)table Table 1
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Table 2(p. 6)table Table 2
Figure 6(p. 7)figure Figure 6

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Related Subjects

36 MATERIALS SCIENCE
CO oxidation
Ostwald ripening
acetylene hydrogenation
gold
interface
self-assembled monolayers
supported metal catalysts
thermostability