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Substituting Chromium in Iron-Based Catalysts for the High-Temperature Water-Gas Shift Reaction
M I Ariëns1,2, L G A van de Water3, A I Dugulan1
1Fundamental Aspects of Materials and Energy, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands.
Doped iron oxides were tested for water-gas shift (WGS) activity. Aluminum and chromium dopants showed the highest CO conversion, making aluminum a promising alternative for industrial WGS catalysts.
Area of Science:
- Materials Science
- Catalysis
- Chemical Engineering
Background:
- The water-gas shift (WGS) reaction is crucial for hydrogen production.
- Developing efficient and stable catalysts for WGS is an ongoing industrial challenge.
- Iron oxides are common bases for WGS catalysts, but doping can enhance performance.
Purpose of the Study:
- To synthesize and characterize doped iron oxides for WGS activity.
- To evaluate the impact of various dopants (Cr, Al, Ga, In, Mn, Zn, Nb) on catalyst performance.
- To identify promising dopants for industrial high-temperature WGS applications.
Main Methods:
- One-step coprecipitation/calcination synthesis of doped iron oxides.
- Evaluation of WGS activity under industrially relevant conditions (aged for 4 days at 25 bar).
- Detailed characterization using Mössbauer spectroscopy and X-ray photoelectron spectroscopy (XPS).
Main Results:
- Copper-codoped catalysts showed WGS activity in the order: Cr ≈ Al > Ga > In > Mn > Zn > Nb.
- Activated catalysts primarily consisted of magnetite, with dopant incorporation varying between tetrahedral and octahedral sites.
- Aluminum and chromium dopants yielded high CO conversion, with aluminum being a particularly promising promoter.
Conclusions:
- Dopant type significantly influences the structural incorporation and WGS activity of iron oxide catalysts.
- Aluminum and chromium are effective dopants for high-temperature WGS, with aluminum showing comparable performance to chromium.
- Aluminum represents a viable and promising alternative promoter for commercial WGS catalysts.
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