Role of bismuth on aerobic benzyl alcohol oxidation over ceria polymorph-supported gold nanoparticles

Keshri, Kumer Saurav; Spezzati, Giulia; Ruidas, Santu; Hensen, Emiel J. M.; Chowdhury, Biswajit

doi:10.1016/j.catcom.2020.106004

Cited by 3 publications

(1 citation statement)

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“…Cerium dioxide is one of the most intensively studied model supports for various metals (e.g., Cu [1][2][3], Ag [1,4,5], Pt [6] and Au [7,8]). From among numerous ceria-based systems, the catalysts containing gold nanoparticles have attracted particular attention and have been successfully used in different catalytic processes (e.g., Water-Gas Shift reaction [9], oxidation of CO [10,11], alcohols [12][13][14] and formaldehyde [15]). In terms of selective oxidation of alcohols, it has been established that one of the most important factors affecting the activity and selectivity of Au/CeO 2 catalysts is the size of the supported gold nanoparticles [11,16] and the concentration of lattice defects in the ceria support [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

et al. 2021

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The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

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