Constructing synergy of sufficient hydroxyl and oxygen in PtNi/Al2O3 enables room‐temperature catalytic HCHO oxidation

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‐Al 2 O 3 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‐Al 2 O 3 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‐Al 2 O 3 catalysts for formaldehyde oxidation could be a promising candidate for air purification.