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Identification of active sites on supported metal catalysts with carbon nanotube hydrogen highways
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Identification of active sites on supported metal catalysts with carbon nanotube hydrogen highways
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Journal Article
Identification of active sites on supported metal catalysts with carbon nanotube hydrogen highways
2018
Overview
Catalysts consisting of metal particles supported on reducible oxides exhibit promising activity and selectivity for a variety of current and emerging industrial processes. Enhanced catalytic activity can arise from direct contact between the support and the metal or from metal-induced promoter effects on the oxide. Discovering the source of enhanced catalytic activity and selectivity is challenging, with conflicting arguments often presented based on indirect evidence. Here, we separate the metal from the support by a controlled distance while maintaining the ability to promote defects via the use of carbon nanotube hydrogen highways. As illustrative cases, we use this approach to show that the selective transformation of furfural to methylfuran over Pd/TiO
2
occurs at the Pd-TiO
2
interface while anisole conversion to phenol and cresol over Cu/TiO
2
is facilitated by exposed Ti
3+
cations on the support. This approach can be used to clarify many conflicting arguments in the literature.
Understanding the location and nature of the catalytic active site is critical for controlling a catalyst’s activity and selectivity. Here, the authors separate the metal from the support by a controlled distance while maintaining the ability to promote defects via the use of carbon nanotube hydrogen highways.
