Reactivity of Pd–MO2 encapsulated catalytic systems for CO oxidation

Paz Herrera, Laura; Freitas de Lima e Freitas, Lucas; Hong, Jiyun; Hoffman, Adam S.; Bare, Simon R.; Nikolla, Eranda; Medlin, J. Will

doi:10.1039/d1cy01916c

Title: Reactivity of Pd–MO₂ encapsulated catalytic systems for CO oxidation

Journal Article · Thu Jan 20 00:00:00 EST 2022 · Catalysis Science and Technology

DOI:https://doi.org/10.1039/d1cy01916c· OSTI ID:1863387

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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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515; CHE-19000176/1900183; MRI-1427926; MRI-1849578; MRI-0216084

OSTI ID:: 1863387

Journal Information:: Catalysis Science and Technology, Vol. 12, Issue 5; ISSN 2044-4753

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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