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Active surface formation and catalytic activity of phosphorous-promoted electrolytic silver in the selective oxidation of ethylene glycol to glyoxal

Paper ID Volume ID Publish Year Pages File Format Full-Text
43110 45955 2008 8 PDF Available
Title
Active surface formation and catalytic activity of phosphorous-promoted electrolytic silver in the selective oxidation of ethylene glycol to glyoxal
Abstract

Unpromoted and phosphorus-promoted electrolytic silver catalysts have been investigated in the partial oxidation of ethylene glycol (EG). It was shown that the addition of the phosphorus-containing promoter on the surface of electrolytic Ag catalyst led to 15–20% increase in glyoxal (GO) yield. The formation mechanism of the active P-containing surfaces of silver catalyst as well as polycrystalline Ag foil has been studied by means of X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD) and scanning electron microscopy (SEM) methods. It was shown that silver clusters located nearby the P-containing Ag surface participate in the ethylene glycol oxidation into glyoxal. The rise of glyoxal selectivity is explained by the absence of low temperature peak at 250 °C in TPD spectra of both P-promoted Ag foil and electrolytic Ag catalysts. This peak was assigned to the decomposition of surface oxide-like species (Ag2sO) responsible for deep oxidation of ethylene glycol.

Graphical abstractP-containing electrolytic silver catalysts have been investigated in the partial oxidation of ethylene glycol (EG). It was shown that the addition of the phosphorus-containing promoter on the surface of electrolytic Ag catalyst led to the growth of glyoxal (GO) yield up to 15–20% mass. The glyoxal selectivity rise is explained by the absence of low temperature oxygen forms in temperature-programmed desorption (TPD) spectra.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ethylene glycol oxidation; Glyoxal; Electrolytic silver catalyst; Phosphorous-containing promoter; Active surface formation
First Page Preview
Active surface formation and catalytic activity of phosphorous-promoted electrolytic silver in the selective oxidation of ethylene glycol to glyoxal
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 344, Issues 1–2, 15 July 2008, Pages 142–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis