In situ observation of highly oxidized Ru species in Ru/CeO2 catalyst under propane oxidation. Issue 31 (2nd August 2022)

• Record Type: Journal Article
• Authors: Bezkrovnyi, Oleksii; Vorokhta, Mykhailo; Pawlyta, Mirosława; Ptak, Maciej; Piliai, Lesia; Xie, Xianxian; Dinhová, Thu Ngan; Khalakhan, Ivan; Matolínová, Iva; Kepinski, Leszek
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 31(2022)
• Page Start: 16675
• Page End: 16684
• Publication Date: 2022-08-02
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02330j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Ru evaporation from the surface of a Ru/CeO2 catalyst is demonstrated. Abstract : In this work, we prepared a promising catalyst for propane oxidation composed of ruthenium supported on polycrystalline hollow CeO2 nanospheres. It was found that the Ru loading on the CeO2 support strongly improves its catalytic activity, decreasing the T 50 by about 200 °C (from 500 to about 300 °C). By utilizing several ex situ techniques (XRD, HR-STEM, Raman spectroscopy, ICP analysis) and in situ NAP-XPS, we investigated the effect of different pre-treatments (calcination, reduction, and C3 H8 oxidation reaction) on the morphology, structure, and chemical state of the Ru/CeO2 catalyst. The correlations between the chemical state of ruthenium in the Ru/CeO2 catalyst and its activity in C3 H8 oxidation received particular attention. Here, it is shown for the first time that the Ru/CeO2 interaction with an oxygen-rich atmosphere (C3 H8 + O2 (1 : 10)) at ≥300 °C results in ruthenium oxidation to volatile RuO4, leading to Ru evaporation/desorption from the outer surface and homogeneous high dispersion inside the powder catalyst.