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Constructing synergy of sufficient hydroxyl and oxygen in PtNi/Al2O3 enables room-temperature catalytic HCHO oxidation |
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| Authors: | Xuyu Wang Fu Yang Jianjian Yi Jiejing Kong Juanjuan Gong Aihua Yuan Zebao Rui Hongbing Ji |
| Affiliation: | 1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China;2. College of Environmental Science and Engineering, Yangzhou University, Yangzhou, China;3. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China
Contribution: Investigation (supporting);4. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China Contribution: Data curation (supporting), Methodology (supporting);5. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China Contribution: Project administration (supporting);6. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, China |
| Abstract: | Rational engineering of noble metal/transition metal bimetallic catalysts is considered as an effective way to constructing synergistic effect between adsorbed oxygen and hydroxyl for enhanced catalytic formaldehyde oxidation. Herein, we developed a Pt–Ni bimetallic catalysts loading on γ-Al2O3 support for room-temperature formaldehyde oxidation. Catalytic experiment results showed that the conversion rate was >97% with a >100 h stability. Several noble metals (Pd, Au, and Ag) were compared to identify the activity effect in formaldehyde oxidation. The activity and stability test in different atmospheres and in situ infrared test suggested that the PtNi/γ-Al2O3 has the best activity and stability. At a meantime, the results also demonstrated that Pt sites motivate more surface adsorbed oxygen through activating ambient oxygen molecules, while the neighboring Ni atoms contribute to adsorbed hydroxyl, thereby offering sustainable activity. The high efficiency and stability of PtNi/γ-Al2O3 catalysts for formaldehyde oxidation could be a promising candidate for air purification. |
| Keywords: | adsorbed species catalytic oxidation formaldehyde structural design synergistic effect |