Properties of Bulk In‐Pt Intermetallic Compounds in Methanol Steam Reforming. Issue 8 (21st March 2022)

• Record Type: Journal Article
• Authors: Köwitsch, Nicolas; Barth, Stefan; Ploner, Kevin; Blume, Raoul; Teschner, Detre; Penner, Simon; Armbrüster, Marc
• Is Part Of: Chemphyschem. Volume 23:Issue 8(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-21
• Subjects: methanol steam reforming -- intermetallic compounds -- heterogeneous catalysis -- renewable hydrogen -- operando measurements; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.202200074
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Heterogeneous catalysts are often complex materials containing different compounds. While this can lead to highly beneficial interfaces, it is difficult to identify the role of single components. In methanol steam reforming (MSR), the interplay between intermetallic compounds, supporting oxides and redox reactions leads to highly active and CO2 ‐selective materials. Herein, the intrinsic catalytic properties of unsupported In3 Pt2, In2 Pt, and In7 Pt3 as model systems for Pt/In2 O3 ‐based catalytic materials in MSR are addressed. In2 Pt was identified as the essential compound responsible for the reported excellent CO2 ‐selectivity of 99.5 % at 300 °C in supported systems, showing a CO2 ‐selectivity above 99 % even at 400 °C. Additionally, the partial oxidation of In7 Pt3 revealed that too much In2 O3 is detrimental for the catalytic properties. The study highlights the crucial role of intermetallic In−Pt compounds in Pt/In2 O3 materials with excellent CO2 ‐selectivity. Abstract : Catalytic properties of In‐Pt intermetallic compounds in methanol steam reforming have been investigated. In2 Pt has been proven to be mandatory for a high activity and selectivity. Only small amounts of In2 O3 have been found to be beneficial for catalytic performance.