Deactivation Behavior of Supported Gold Palladium Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol in a Micropacked Bed Reactor

Noor Al-Rifai, Peter J. Miedziak, Moataz Morad, Meenakshisundaram Sankar, Conor Waldron, Stefano Cattaneo, Enhong Cao, Samuel Pattisson, David Morgan, Donald Bethell, Graham J. Hutchings, Asterios Gavriilidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

Highly active, supported Au-Pd catalysts have been tested for catalyzing benzyl alcohol oxidation in a silicon-glass micropacked bed reactor. The effects of Au-Pd composition and anion content during catalyst preparation on catalyst deactivation were studied, and a relationship between the deactivation rate and the amount of Cl- and Au used in the catalyst formulation was found. While Au AIDS in enhancing the selectivity to the desired product and the Cl- ions help the formation of uniform 1-2 nm nanoparticles, higher amounts of Au and Cl- become detrimental to the catalyst stability once a certain amount is exceeded. Loss of small (1-2 nm) metal nanoparticles was evident in all catalysts studied, accompanied by agglomeration and the formation of larger >10 nm particles. A secondary deactivation mechanism characterized by the formation of an amorphous surface film was observed via transmission electron microscopy in catalysts with high Cl- and Au and was associated with the detection of carbon species on the catalyst surface using Raman spectroscopy.

Original languageEnglish
Pages (from-to)12984-12993
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume56
Issue number45
DOIs
Publication statusPublished - 15 Nov 2017
Externally publishedYes

Fingerprint

Dive into the research topics of 'Deactivation Behavior of Supported Gold Palladium Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol in a Micropacked Bed Reactor'. Together they form a unique fingerprint.

Cite this