Eliminating indoor formaldehyde (HCHO) pollution at room temperature is highly needed to improve the environment while saving energy. Herein, Pd/CeO₂ catalysts with different morphologies of the CeO₂ support were employed to investigate their performance for HCHO oxidation. The Pd/CeO₂ nanocube (Pd/CeO₂-C) catalyst exhibited excellent catalytic activity compared to commercial CeO₂ and CeO₂ nanorods. HCHO can be completely converted into CO₂ and H₂O over the Pd/CeO₂-C (0.64 wt% Pd) catalyst at a weight hourly space velocity of 36 000 mL g⁻¹ h⁻¹ at room temperature. Multiple characterization results confirmed that the strong interfacial interaction between Pd and the CeO₂-C support guarantees a high percentage of metallic Pd on the CeO₂-C surface and its high dispersion, which is crucial for the oxidation of formaldehyde at low temperature. The in situ diffuse reflectance infrared Fourier transform results indicated that CO, formate and dioxymethylene species are the main intermediates over the Pd/CeO₂-C catalyst, and the active O species is responsible for their decomposition and oxidation. This work may promote the practical application of high performance Pd-based catalysts for indoor HCHO purification and related catalytic processes.

中文翻译：

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制备 Pd/CeO2 纳米立方体作为室温降解甲醛的高效催化剂

非常需要在室温下消除室内甲醛 (HCHO) 污染，以改善环境，同时节约能源。在此，使用具有不同形态的 CeO ₂载体的Pd/CeO ₂催化剂来研究它们对 HCHO 氧化的性能。将Pd /的CeO ₂纳米立方体（钯/的CeO ₂相比的商业的CeO -C）催化剂具有优异的催化活性₂和的CeO _2个纳米棒。HCHO 可以在 Pd/CeO ₂ -C (0.64 wt% Pd) 催化剂上以 36 000 mL g ^-1 h ^-1的重时空速完全转化为 CO ₂和 H ₂ O在室温下。多项表征结果证实，Pd 和 CeO ₂ -C 载体之间的强界面相互作用保证了 CeO ₂ -C 表面上高百分比的金属 Pd及其高分散性，这对于甲醛在低温下的氧化至关重要。的原位漫反射红外傅里叶变换结果表明CO，甲酸盐和二氧亚甲基物种是在钯/负责主要中间体₂ -C催化剂，活性O类物质是负责其分解和氧化。这项工作可能会促进高性能 Pd 基催化剂在室内 HCHO 净化和相关催化过程中的实际应用。