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Title: Highly Active Ceria-Supported Ru Catalyst for the Dry Reforming of Methane: In Situ Identification of Ruδ+ –Ce3+ Interactions for Enhanced Conversion

Journal Article · · ACS Catalysis

The metal-oxide interaction changes the surface electronic states of catalysts deployed for chemical conversion, yet details of its influence on the catalytic performance under reaction conditions remain obscure. In this work, we report the high activity/stability of a ceria supported Ru-nanocluster (<1nm) catalyst during the dry reforming of methane. To elucidate the structure-reactivity relationship underlying the catalyst’s remarkable catalytic performance, the active structure and chemical speciation of the catalyst was characterized using in-situ X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS), while the surface chemistry and active intermediates were monitored by in-situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Methane activates on the catalyst surface at temperatures as low as 150 °C. Under reaction conditions, the existence of metal-support interactions tunes the electronic properties of the Ru nanoclusters, giving rise to a partially oxidized state of ruthenium stabilized by reduced ceria (Ruδ+-CeO2-x) to sustain active chemistry, which is found to be very different from that of large Ru nanoparticles supported on ceria. The oxidation of surface carbon is also a crucial step for the completion of the catalytic cycle, and this is strongly correlated with the oxygen transfer governed by the Ruδ+-CeO2-x interactions at higher temperatures (> 300 °C). The possible reaction pathways and stable surface intermediates were identified using DRIFTS including ruthenium carbonyls, carboxylate species, and surface -OH groups while polydentate carbonates may be plain spectators at the measured reaction conditions.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
1524089
Alternate ID(s):
OSTI ID: 1557112
Report Number(s):
BNL-211970-2019-JAAM; 152729
Journal Information:
ACS Catalysis, Vol. 9, Issue 4; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 82 works
Citation information provided by
Web of Science

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Cited By (2)

Insights into interface engineering in steam reforming reactions for hydrogen production journal January 2019
CeO 2−x quantum dots with massive oxygen vacancies as efficient catalysts for the synthesis of dimethyl carbonate journal January 2020