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Formation of Active Ordered Layer on Pt–Rh Catalyst

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Dynamic Chemical Processes on Solid Surfaces

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Abstract

Pt and Rh are stable metals taking very high melting temperatures (Pt: 1,997 K, Rh: 2,249 K) and they form a random alloy. The Pt and Rh are not so active catalyst for the reaction of NO + H2 → 1/2 N2 + H2O, and the surface of Pt–Rh alloy itself is also not so active for this reaction. However, a Pt0.25Rh0.75(100) alloy surface changes to an extremely active surface in O2 at ca. 400 K, where the alloy surface is transformed from random to an ordered alloy layer with a (3 × 1) structure, and the same active (3 × 1) ordered layer is established on the Pt/Rh(100) and Rh/Pt(100) bimetallic surfaces. Once a (3 × 1) ordered layer is established, which is stable up to ca. 800 K in vacuum. STM image shows that the ordered Pt0.25Rh0.75(100) alloy surface takes a composite array of Pt and (Rh–O) rows in a (3 × 1) array, and the ordered alloy layer can keep up to ca. 800 K. The ordered Pt–Rh alloy layer is a new material being active for the reduction of NO with H2, and the active hybrid ordered alloy layer is an active component of the three-way Pt–Rh catalyst developed for removal of NOx, CO, and hydrocarbons in automobile exhaust gas.

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  1. The University of Tokyo, Institute of Solid State Physics, Kashiwa, Chiba, Japan

    Ken-ichi Tanaka

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  1. Ken-ichi Tanaka
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Correspondence to Ken-ichi Tanaka .

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Tanaka, Ki. (2017). Formation of Active Ordered Layer on Pt–Rh Catalyst. In: Dynamic Chemical Processes on Solid Surfaces. Springer, Singapore. https://doi.org/10.1007/978-981-10-2839-7_9

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