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*

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

1 Dyfyniad (Scopus)
4 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

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.

Iaith wreiddiolSaesneg
Tudalennau (o-i)12984-12993
Nifer y tudalennau10
CyfnodolynIndustrial and Engineering Chemistry Research
Cyfrol56
Rhif cyhoeddi45
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 15 Tach 2017
Cyhoeddwyd yn allanolIe

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