Integrated in situ characterization of molten salt catalyst surface: Evidence of sodium peroxide and OH radical formation

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Na-based catalysts (i.e., Na2WO4) were proposed to selectively catalyze OH radical formation from H2O and O2 at high temperatures. This reaction may proceed on molten salt state surfaces due 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) spectrometer, 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, has been identified on the outer surfaces at temperatures ≥800°C, and these species are useful for various gas-phase hydrocarbon reactions including the selective transformation of methane to ethane.
Original languageEnglish (US)
Pages (from-to)10403-10407
Number of pages5
JournalAngewandte Chemie International Edition
Volume56
Issue number35
DOIs
StatePublished - Jul 24 2017

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