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

Published on 2017-06-29T04:32:23Z (GMT) by
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<sup>–</sup> and Au used in the catalyst formulation was found. While Au aids in enhancing the selectivity to the desired product and the Cl<sup>–</sup> ions help the formation of uniform 1–2 nm nanoparticles, higher amounts of Au and Cl<sup>–</sup> 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<sup>–</sup> and Au and was associated with the detection of carbon species on the catalyst surface using Raman spectroscopy.

Cite this collection

Al-Rifai, Noor; Miedziak, Peter J.; Morad, Moataz; Sankar, Meenakshisundaram; Waldron, Conor; Cattaneo, Stefano; Cao, Enhong; Pattisson, Samuel; Morgan, David; Bethell, Donald; Hutchings, Graham J.; Gavriilidis, Asterios (2017): Deactivation Behavior of Supported Gold Palladium

Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol

in a Micropacked Bed Reactor. ACS Publications.

https://doi.org/10.1021/acs.iecr.7b01159

Retrieved: 03:33, Oct 20, 2017 (GMT)