Method for preparing a catalyst composition

The use of oxalate salts in preparing indium bismuth alloys addresses the inefficiencies of citrate-based methods, resulting in higher yields and reproducible catalysts for electrochemical carbon dioxide conversion.

WO2025229143A1 Publication Date: 2025-11-06AVANTIUM KNOWLEDGE CENT BV
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Patent Information

Application Number
PCT/EP2025/062006
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-02
Filing Date
2025-05-01
Publication Date
2025-11-06

AI Technical Summary

Technical Problem

Existing methods for preparing indium and bismuth containing catalysts using citrate as a ligand result in low metal yields, are difficult to reproduce, and produce pure metallic phases instead of alloys, making them inefficient and unreliable for electrochemical carbon dioxide conversion.

Method used

A method utilizing oxalate salts in combination with indium and bismuth containing salts to form indium bismuth alloys, involving a precursor mixture with controlled addition of reducing agents and support materials, allowing for higher metal yields and reproducible synthesis.

Benefits of technology

The method achieves higher metal yields and reproducibility, producing indium bismuth alloys suitable for electrochemical carbon dioxide conversion to formate or formic acid, with improved catalytic performance.

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Abstract

Method for preparing a catalyst composition comprising indium bismuth alloy which method comprises (a) combining at least an indium containing salt, a bismuth containing salt and an oxalate salt in a liquid to obtain a precursor mixture; (b) combining the precursor mixture with a reducing agent to obtain a suspension comprising the catalyst composition; and (c) separating the catalyst composition from the suspension, wherein a support material is either added to the precursor mixture or to the reducing agent, and to catalyst composition comprising indium bismuth alloy obtainable by this method.
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