Effect of Support Precalcination on the CO Oxidation Activity and SO <sub>2</sub> Resistance of Pt–Pd/TiO <sub>2</sub> Catalysts
Developing highly efficient, SO2-resistant low-temperature CO oxidation catalysts is crucial for industrial applications. This study optimized Pt–Pd/TiO2 catalysts via TiO2 support precalcination. Precalcination at 600–800 °C significantly enhanced the CO oxidation activity and SO2 tolerance. The sample precalcined at 700 °C (denoted Pt–Pd/TiO2(700)) showed the best performance, achieving complete CO conversion (T100) at 120 °C under a feed gas (0.8% CO, 5% O2, balance N2)─a significant 50 °C reduction compared to the T100 of 170 °C for the unmodified Pt–Pd/TiO2 catalyst. In a 45 h stability test under a wet gas containing 15% H2O and 200 ppm of SO2, Pt–Pd/TiO2(700) maintained >95% CO conversion, outperforming the unmodified Pt–Pd/TiO2 catalyst (74.2%). Characterization revealed that precalcination at 700 °C increased surface Pt/Pd concentration and metallic species proportion, improving activity. Enlarged Pt/Pd particles and pores also inhibited SO2 adsorption and sulfate formation, enhancing the SO2 resistance. The Pt–Pd/TiO2(700) catalyst shows promising potential for industrial CO removal.
Authors
- Yudong Meng (ORCID: https://orcid.org/0000-0002-1892-3394)
- Zehui Yu
- Wenjun Liang
- Jianyu Cai
- Xing Fan
- Jian Li
Institutions
- Beijing University of Technology (CN)
- Chinese Research Academy of Environmental Sciences (CN)
Publication Details
- Journal
- Industrial & Engineering Chemistry Research
- Published
- 2026-02-02
- DOI
- https://doi.org/10.1021/acs.iecr.5c05100
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 0.00