Energy-efficient catalytic removal of formaldehyde enabled by precisely Joule-heated Ag/Co3O4@mesoporous-carbon monoliths

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,...

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Veröffentlicht in:Carbon (New York) 2020-10, Vol.167, p.709-717
Hauptverfasser: Wang, Kun, Zeng, Yongjian, Lin, Wenzhu, Yang, Xixian, Cao, Yonghai, Wang, Hongjuan, Peng, Feng, Yu, Hao
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container_end_page 717
container_issue
container_start_page 709
container_title Carbon (New York)
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creator Wang, Kun
Zeng, Yongjian
Lin, Wenzhu
Yang, Xixian
Cao, Yonghai
Wang, Hongjuan
Peng, Feng
Yu, Hao
description 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. [Display omitted] •The mesoporous 3D Carbon Monolith is of high conductivity, high strength and low pressure drop.•Ag-Co3O4@3DCM is active for the catalytic oxidation of ambient formaldehyde.•The excellent Joule-heating property of 3DCM enables the fast heating-up of reactor.•The integration of catalyst and heater improves the energy efficiency.
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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. 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subjects Bimetals
Carbon
Carbon monolith
Catalysis
Catalysts
Catalytic oxidation
Cobalt oxides
Electricity to heat
Energy consumption
Formaldehyde
Heat transfer
Joule-heating
Low temperature
Monolithic materials
Pollutants
VOCs
Volatile organic compounds
title Energy-efficient catalytic removal of formaldehyde enabled by precisely Joule-heated Ag/Co3O4@mesoporous-carbon monoliths
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