Site requirements for inhibition-free CO oxidation over silica-supported bimetallic PdCu alloys

Kristy, Stephen; Svadlenak, Scott; Hoffmann, Adam S.; Bare, Simon R.; Goulas, Konstantinos A.

doi:10.1039/d4cy00255e

Title: Site requirements for inhibition-free CO oxidation over silica-supported bimetallic PdCu alloys

Journal Article · 17 June 2024 · Catalysis Science and Technology

DOI: https://doi.org/10.1039/d4cy00255e · OSTI ID:2407121

Kristy, Stephen ^[1]; Svadlenak, Scott ^[2];

^[3];

^[2]

Oregon State Univ., Corvallis, OR (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); SLAC
Oregon State Univ., Corvallis, OR (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Pd catalysts are highly active for CO oxidation but suffer from inhibition by NO at low temperatures (<150 °C). We posit that incorporation of Cu into the Pd catalyst will improve low-temperature CO oxidation activity and reduce inhibition from competitive adsorbers. To probe this hypothesis, a series of PdCu alloys with different Pd : Cu ratios were synthesized and tested in the temperature-programmed oxidation of CO in the presence and absence of NO. Incorporation of small amounts of Cu into Pd improves the reactivity, as well as the resistance to NO inhibition. Beyond this, Cu incorporation into the Pd has a detrimental effect on the activity for CO oxidation. Based on combined infrared and X-ray absorption spectroscopy studies, here we show that high activity and resistance to inhibition requires alloying of Pd and Cu and the formation of a diverse surface, while surface segregation of Cu results in poor activity and inhibition.

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

Sponsoring Organization:: USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515; SC0014664

OSTI ID:: 2407121

Journal Information:: Catalysis Science and Technology, Journal Name: Catalysis Science and Technology Journal Issue: 14 Vol. 14; ISSN 2044-4753

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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surface diversity

Title: Site requirements for inhibition-free CO oxidation over silica-supported bimetallic PdCu alloys

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