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Improved Low-Temperature Hydrogen Production from Aqueous Methanol Based on Synergism between Cationic Pt and
Kohsuke Mori1,2, Yuki Shimoji1, Hiromi Yamashita1,2
1Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Chemsuschem
|May 15, 2023
Summary
A novel catalyst featuring amorphous lanthanum oxide on a titanium nitride support significantly improves aqueous phase methanol reforming for hydrogen production. This enhanced catalyst offers superior activity and stability under mild, base-free conditions.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Aqueous phase reforming of methanol (APRM) offers a promising, low-temperature alternative to traditional gas-phase reactions for hydrogen generation.
- Achieving high efficiency and stability in APRM requires advanced catalyst design, particularly at the interface between active metals and supports.
- Titanium nitride (TiN) is explored as a support material due to its unique properties, but its performance can be further optimized.
Purpose of the Study:
- To enhance the activity and stability of platinum (Pt) catalysts for APRM by modifying the Pt-TiN interface.
- To investigate the role of an amorphous lanthanum oxide (LaOx) interlayer in the catalytic performance.
- To understand the reaction mechanism and the synergistic effects between Pt, LaOx, and TiN under base-free conditions.
Main Methods:
- Synthesis of Pt catalysts supported on TiN modified with a highly dispersed amorphous LaOx phase (Pt/LaOx /TiN).
- Evaluation of catalytic performance in the APRM reaction under base-free conditions.
- Characterization of catalyst properties, including nanoparticle size distribution and electronic state, using kinetic isotope data and theoretical investigations.
Main Results:
- The Pt/LaOx /TiN catalyst demonstrated significantly enhanced activity and long-term stability compared to Pt/TiN or Pt supported on crystalline La2 O3.
- The amorphous LaOx phase facilitated the formation of small Pt nanoparticles with a narrow size distribution and induced electron deficiency in Pt.
- Kinetic and theoretical studies indicated that cationic Pt nanoparticles promoted methanol bond cleavage, while amorphous LaOx enhanced water dissociation, facilitating the water-gas shift reaction.
Conclusions:
- The interfacial amorphous LaOx phase is crucial for improving Pt catalyst performance in APRM.
- The developed Pt/LaOx /TiN catalyst offers a highly effective and stable system for hydrogen production via APRM under mild, base-free conditions.
- The findings provide insights into catalyst design strategies for optimizing hydrogen generation technologies.
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