Abstract The high-efficiency catalysts for the oxidative removal of volatile organic compounds (VOCs) as air pollutants are in urgent need. Because of the extremely low concentration of VOCs, very high intrinsic activity at low temperatures is required for the catalyst or the temperature has to be elevated, which causes unaffordable energy consumption. Here, a mesoporous three-dimensional-carbon-monolith (3DCM) supported Ag-Co3O4 bimetallic catalyst is fabricated for the catalytic removal of formaldehyde. Enabled by the excellent Joule-heating property of 3DCM, the catalyst can be precisely heated without the need to heat the largely excessive air and surroundings. By this means, the energy consumption of the whole device can be drastically reduced by 87%. As a proof-of-concept demonstration, in the presence of constant emission, the formaldehyde concentration can be reduced from 4 ppm to 600 ppb after 10 h reaction in a 2 m3 gastight chamber. The strategy here suggests a promising technology to eliminate VOCs efficiently, fast-responsively and energy-savingly.

中文翻译：

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精确焦耳加热的 Ag/Co3O4@介孔碳整料实现高效节能的甲醛催化去除

摘要 迫切需要用于氧化去除空气污染物挥发性有机化合物（VOCs）的高效催化剂。由于VOCs的浓度极低，催化剂需要在低温下具有非常高的内在活性，或者必须升高温度，这会导致无法承受的能源消耗。在这里，制备了一种介孔三维碳单块 (3DCM) 负载的 Ag-Co3O4 双金属催化剂，用于催化去除甲醛。借助 3DCM 出色的焦耳加热特性，可以精确加热催化剂，而无需加热大量过量的空气和周围环境。通过这种方式，整个设备的能耗可以大幅降低 87%。作为概念验证演示，在持续发射的情况下，在 2 立方米的气密室中反应 10 小时后，甲醛浓度可以从 4 ppm 降低到 600 ppb。这里的策略提出了一种有前途的技术，可以有效、快速响应和节能地消除 VOC。