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.

中文翻译：

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在 PtNi/Al2O3 中构建足够的羟基和氧的协同作用可实现室温催化 HCHO 氧化

贵金属/过渡金属双金属催化剂的合理工程被认为是在吸附氧和羟基之间构建协同效应以增强催化甲醛氧化的有效途径。_{在此，我们开发了负载在 γ-Al 2} O ₃载体上的 Pt-Ni 双金属催化剂用于室温甲醛氧化。催化实验结果表明，转化率>97%，稳定性>100 h。比较了几种贵金属（Pd、Au 和 Ag）以确定其在甲醛氧化中的活性效应。不同气氛下的活性和稳定性测试以及原位红外测试表明PtNi/γ-Al ₂ O ₃具有最好的活性和稳定性。同时，结果还表明，Pt 位点通过激活环境氧分子来激发更多的表面吸附氧，而相邻的 Ni 原子则有助于吸附羟基，从而提供可持续的活性。_{用于甲醛氧化的 PtNi/γ-Al 2} O ₃催化剂的高效性和稳定性可能是空气净化的有前途的候选者。