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MS: Fachverband Massenspektrometrie

MS 3: Mass Spectrometry Applications

MS 3.1: Hauptvortrag

Mittwoch, 8. März 2023, 14:30–15:00, F128

Durable, low-temperature and highly-selective catalysis in NO reduction and CO oxidation driven by uni-sized Pt clusters supported on Si and SiC substrates — •Hisato Yasumatsu — Toyota Technological Institute, Ichikawa, Chiba, Japan

It has been found that Pt clusters are fixed to a Si substrate as Pt cluster disks by impact of Pt cluster ions onto the substrate. Electrons accumulated at the sub-nano interface between the Pt cluster and the Si substrate surface enable catalytic NO reduction and CO oxidation at low temperatures with high selectivity.

When the substrate is changed to silicon carbide, SiC, which is well known to possess high chemical and thermal stability, one can obtain durable catalysis as high as 1200 K with maintaining the low-temperature and highly-selective catalytic performance. This study shows a way to utilize this unique and high-performance catalysis driven by the electron accumulation as practical catalysts of electron donation including the gas treatment, and further extension to water-splitting hydrogen production and fuel-cell oxygen reduction reaction (ORR) as well.

Size-selected clusters by passing through a mass filter and cooled through a He collision cell were allowed to collide onto the substrate. Geometry and electron distribution were studied by means of scanning-tunneling microscopy. Electronic structures were obtained through X-ray photoelectron spectroscopy. Catalytic activity was measured with surface-chemistry techniques and fixed-bed gas-flow reaction analysis in combination of mass spectroscopy.