Integrated In Situ Characterization of a Molten Salt Catalyst Surface: Evidence of Sodium Peroxide and Hydroxyl Radical Formation

Takanabe, Kazuhiro; Khan, Abdulaziz M.; Tang, Yu; Nguyen, Luan; Ziani, Ahmed; Jacobs, Benjamin W.; Elbaz, Ayman M.; Sarathy, S. Mani; Tao, Franklin Feng

doi:10.1002/anie.201704758

Title: Integrated In Situ Characterization of a Molten Salt Catalyst Surface: Evidence of Sodium Peroxide and Hydroxyl Radical Formation

Journal Article · Mon Jul 24 00:00:00 EDT 2017 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201704758· OSTI ID:1425939

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King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE)
Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemical and Petroleum Engineering Dept. of Chemistry
Protochips, Inc., Morrisville, NC (United States); North Carolina State Univ., Raleigh, NC (United States). Analytical Instrumentation Facility, Materials Science and Engineering Dept.
King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Clean Combustion Research Center (CCRC) and Physical Sciences and Engineering Division (PSE)

Sodium-based catalysts (such as Na₂ WO₄) were proposed to selectively catalyze OH radical formation from H₂O and O₂ at high temperatures. This reaction may proceed on molten salt state surfaces owing to the lower melting point of the used Na salts compared to the reaction temperature. This study provides direct evidence of the molten salt state of Na₂WO₄, which can form OH radicals, using in situ techniques including X-ray diffraction (XRD), scanning transmission electron microscopy (STEM), laser induced fluorescence (LIF) spectrometry, and ambient-pressure X-ray photoelectron spectroscopy (AP-XPS). As a result, Na₂O₂ species, which were hypothesized to be responsible for the formation of OH radicals, have been identified on the outer surfaces at temperatures of ≥800°C, and these species are useful for various gasphase hydrocarbon reactions, including the selective transformation of methane to ethane.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014561

OSTI ID:: 1425939

Journal Information:: Angewandte Chemie (International Edition), Vol. 56, Issue 35; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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A robust fuel cell operated on nearly dry methane at 500 °C enabled by synergistic thermal catalysis and electrocatalysis Chen, Yu; deGlee, Ben; Tang, Yu Nature Energy, Vol. 3, Issue 12 https://doi.org/10.1038/s41560-018-0262-5	journal	October 2018
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