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首页> 外文期刊>Catalysis science & technology >Complete oxidation of formaldehyde over a Pd/CeO(2)catalyst at room temperature: tunable active oxygen species content by non-thermal plasma activation
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Complete oxidation of formaldehyde over a Pd/CeO(2)catalyst at room temperature: tunable active oxygen species content by non-thermal plasma activation

机译：完整的甲醛的氧化Pd /首席执行官(2)催化剂在室温下:可调活性氧物种由非热能的内容等离子体激活

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摘要

Formaldehyde is a main indoor pollutant and its removal is essential to protect human health and meet strict environmental regulations. It is highly desirable to develop efficient catalysts to achieve complete oxidation of formaldehyde at room temperature. However the preparation of catalysts generally requires harsh conditions and long times. In this work, a quick, mild and efficient alternative method was employed to prepare a Pd/CeO(2)catalyst and adjust its characteristicsvianon-thermal plasma activation. The plasma activation could obtain tunable active oxygen species content since it can change the metallic Pd percentage, oxygen vacancy concentration and Pd particle size simultaneously. A close relationship between the active oxygen species content and HCHO catalytic oxidation activity was established. The Pd/CeO(2)catalyst activated by plasma for only 2 minutes showed the best conversion of over 76% due to its highest active oxygen species amount. The results ofin situDRIFTS of HCHO oxidation over the Pd/CeO(2)catalyst suggested that the intermediates mainly included formate, dioxymethylene and polyoxymethylene species. The high content of active oxygen species could promote the rate determining step of formate species oxidation. This study provides a quick and efficient catalyst activation method for HCHO catalytic oxidation at room temperature.
机译：甲醛是一种主要的室内污染物及其删除是必要的,以保护人类健康和满足严格的环保法规。高度的发展有效的催化剂实现完整的甲醛的氧化室温。通常要求苛刻条件和催化剂长时间。有效的替代法准备一个Pd /首席执行官(2)催化剂和调整characteristicsvianon-thermal等离子体激活。等离子体活化可以获得可调活跃因为它可以改变氧物种的内容金属Pd百分比,氧空位浓度和Pd粒子大小同时进行。内容和一氧化碳催化活性氧物种氧化活性。Pd /首席执行官(2)催化剂激活等离子体仅为2记录显示的最佳转换超过76%由于其最高活性氧物种数量。结果盒装situDRIFTS一氧化碳氧化在Pd /首席执行官(2)表明,催化剂中间体主要包括甲酸,dioxymethylene和聚甲醛物种。活性氧物种的含量高促进甲酸的速率决定步骤物种的氧化。一氧化碳和高效催化剂活化方法在室温下催化氧化。

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