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

A prototype for catalytic removal of formaldehyde and CO in a compact air cleaner powered by portable electricity

“…S3), which is in agreement with the reported findings that the activated energies of lean methane oxidation were lowered by assisting electric field. 15,16 In comparison with the works employing carbon materials as supports, [7][8][9] the electric current passed through the catalyst itself and the actions of the electricity on the reactions were beyond the Joule heating from the support in this work. Therefore, the prototype of the air cleaner powered by portable electricity can exhibit higher performance for the removals of the pollutants than the traditional thermal heating way.…”

“…At a steady state with electricity, the Joule heating is balanced by the summation of the temperature change of gas flow, the conductive, convective, and radiative heat losses and the reaction heat. 9 A linear relationship between catalyst temperature and input electric power was shared by both reactions of HCHO and CO oxidations as revealed by Fig. S2, suggesting the reaction heat was too small compared to the Joule heat to affect the catalyst temperatures.…”

“…Wang's group have developed a technique of electrothermal regeneration for HCHO removal over MnO 2 decorated of carbon cloth 7 and carbon membrane, 8 which can provide Joule heat to accelerate the HCHO oxidation. Yu's group 9 achieved energy-efficient catalytic removal of HCHO enabled by precisely Joule-heated Ag/Co 3 O 4 @mesoporous-carbon monoliths, in which the energy consumption can be drastically reduced by 87%. These works inspire us to utilize portable electricity to eliminate HCHO and CO, and develop a prototype reactor with a conductive catalyst which does not only depend on the Joule heating from the conductive supports.…”

Sustainable Carbon Materials toward Emerging Applications

“…[ 95 ] Wang et al. prepared a 3D‐carbon‐monolith (3DCM) supported Ag‐Co 3 O 4 catalyst with excellent Joule‐heating property, [ 96 ] which could be employed as supporting materials of catalysts and the heating component. Due to the cohesiveness and plasticity of starch, there was a N‐doped mesoporous carbon that was prepared with cylinder‐shaped extrudate by using wheat flour as precursors.…”

Understanding the Joule-heating behaviours of electrically-heatable carbon-nanotube aerogels

“…The thermal conductivity (k, W m À1 K À1 ) was calculated from the equation k ¼ q/(4 Â C rad ), here q is the power density. 16,35 The thermal conductivity of the aerogel for the TB arrangement, increased by 37% when compressed from 10% to 20% (Table S1, ESI †), due to the formation of a more interconnected nanostructure which lowers the resistance for phonon transport and facilitates heat transfer. 31,36 However, the thermal conductivity of the aerogel remained almost constant at $0.117 W m À1 K À1 when using the SS arrangement.…”