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Highly Effective Pt-Based Water-Gas Shift Catalysts by Surface Modification with Alkali Hydroxide Salts
Matthias Kusche1, Karen Bustillo2, Friederike Agel1
1Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 3, 91058 Erlangen (Germany), 9131-8527421.
Chemcatchem
|September 29, 2015
Summary
Alkali hydroxide modification of platinum/alumina catalysts enhances water-gas shift reaction performance. This surface modification creates a liquid film, increasing water availability and catalyst stability.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- The water-gas shift (WGS) reaction is crucial for hydrogen production.
- Improving the efficiency and stability of WGS catalysts is an ongoing challenge.
- Platinum (Pt) supported on alumina (Al2O3) is a common WGS catalyst, but its performance can be limited.
Purpose of the Study:
- To develop an economical and effective method to enhance Pt/Al2O3 catalyst performance for the WGS reaction.
- To investigate the role of alkali hydroxide surface modification on catalyst activity and stability.
- To understand the mechanism behind the performance improvement using the solid catalyst with ionic liquid layer approach.
Main Methods:
- Surface modification of Pt/Al2O3 catalysts with alkali hydroxides (e.g., KOH).
- Evaluation of catalyst performance using the water-gas shift reaction.
- Kinetic studies to determine reaction rate dependencies.
- Transmission Electron Microscopy (TEM) to analyze catalyst structure and Pt nanoparticle behavior.
Main Results:
- Alkali doping significantly activates the Pt/Al2O3 catalyst.
- The basic and hygroscopic nature of the alkali hydroxide coating improves catalyst performance.
- A liquid film of alkali hydroxide forms during reaction, enhancing H2O availability at active sites.
- Optimal KOH loading was found to be 7.5 wt%, with excessive loading causing mass transfer limitations.
- The modified catalyst demonstrated high activity and stability over 240 hours on stream.
Conclusions:
- Surface modification with alkali hydroxides is an effective strategy to boost Pt/Al2O3 catalyst performance for the WGS reaction.
- The formation of a dynamic liquid layer and catalyst restructuring contribute to enhanced activity and stability.
- This approach offers a cost-effective method for improving industrial catalytic processes.
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