Reactivity of Pd–MO2 encapsulated catalytic systems for CO oxidation
Journal Article
·
· Catalysis Science and Technology
- Univ. of Colorado, Boulder, CO (United States)
- Wayne State Univ., Detroit, MI (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
In this work, we present an investigation aimed at characterizing and understanding the synergistic interactions in encapsulated catalytic structures between the metal core (i.e., Pd) and oxide shell (i.e., TiO2, ZrO2, and CeO2). Encapsulated catalysts were synthesized using a two-step procedure involving the initial colloidal synthesis of Pd nanoparticles (NPs) capped by various ligands and subsequent sol–gel encapsulation of the NPs with porous MO2 (M = Ti, Zr, Ce) shells. The encapsulated catalytic systems displayed higher activity than the Pd/MO2 supported structures due to unique physicochemical properties at the Pd–MO2 interface. Pd@ZrO2 exhibited the highest catalytic activity for CO oxidation. Results also suggested that the active sites in Pd encapsulated by an amorphous ZrO2 shell structure were significantly more active than the crystalline oxide encapsulated structures at low temperatures. Furthermore, CO DRIFTS studies showed that Pd redispersion occurred under CO oxidation reaction conditions and as a function of the oxide shell composition, being observed in Pd@TiO2 systems only, with potential formation of smaller NPs and oxide-supported Pd clusters after reaction. This investigation demonstrated that metal oxide composition and (in some cases) crystallinity play major roles in catalyst activity for encapsulated catalytic systems.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1863387
- Journal Information:
- Catalysis Science and Technology, Journal Name: Catalysis Science and Technology Journal Issue: 5 Vol. 12; ISSN 2044-4753
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A General Approach for Metal Nanoparticle Encapsulation Within Porous Oxides
Deep Understanding of Strong Metal Interface Confinement: A Journey of Pd/FeOx Catalysts
CO2 hydrogenation over oxide-supported PtCo catalysts: The role of the oxide support in determining the product selectivity
Journal Article
·
Sat Nov 09 19:00:00 EST 2024
· Advanced Materials
·
OSTI ID:2504017
Deep Understanding of Strong Metal Interface Confinement: A Journey of Pd/FeOx Catalysts
Journal Article
·
Thu Jul 16 20:00:00 EDT 2020
· ACS Catalysis
·
OSTI ID:1810000
CO2 hydrogenation over oxide-supported PtCo catalysts: The role of the oxide support in determining the product selectivity
Journal Article
·
Sun May 08 20:00:00 EDT 2016
· Angewandte Chemie (International Edition)
·
OSTI ID:1333197