Catalyst Researcher
Figure 1. Prof. Graham Hutchings of the Cardiff School of Chemistry was part of the research team.
Source: University of Cardiff.The catalyzed reaction at 160°C produces benzyl alcohol, benzaldehyde, benzoic acid and benzyl benzoate but no carbon dioxide. Selectivity to the benzoate exceeds 94%. "Catalyst activity could be higher, but it is usable," notes Hutchings, who adds that the next step in the development is to increase catalyst activity.
The nanoparticles are 2--5 nm in size and were prepared by sol immobilization. They contain gold and palladium at about a 1:1 ratio by weight -- the addition of palladium significantly enhances the conversion -- and are stable and reusable, the researchers say. More details appear in a report in Science.
The catalyst currently is in the form of a powder but could be made into pellets, adds Hutchings, who foresees use in either a stirred-pot or continuous flow reactor.
The work was funded by a grant from the Dow Chemical Co., as part of the Dow Methane Challenge, www.chemicalprocessing.com/articles/2007/069.html.