| Title: | Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content |
| Author(s): | Vikrant K; Kim KH; Dong F; Heynderickx PM; Boukhvalov DW; |
| Address: | "Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr. Yangtze Delta Region Institute (Huzhou) & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Huzhou 313001, China. Electronic address: dongfan@uestc.edu.cn. Center for Environmental and Energy Research (CEER), Engineering of Materials via Catalysis and Characterization, Ghent University Global Campus, 119-5 Songdo Munhwa-ro, Yeonsu-gu, Incheon 406-840, Republic of Korea; Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent B-9000, Belgium. Electronic address: philippe.heynderickx@ghent.ac.kr. College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, China; Institute of Physics and Technology, Ural Federal University, Mira Street 19, Yekaterinburg 620002, Russia" |
| DOI: | 10.1016/j.jhazmat.2022.128857 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Under dark/low temperature (DLT) conditions, the oxidative removal of gaseous formaldehyde (FA) was studied using eggshell waste supported silver (Ag)-manganese dioxide (MnO(2)) bimetallic catalysts. To assess the synergistic effects between the two different metals, 0.03%-Ag-(0.5-5%)-MnO(2)/Eggshell catalysts were prepared and employed for DLT-oxidation of FA. The steady-state FA oxidation reaction rate (mmol g(-1) h(-1)), when measured using 100?ª+ppm FA at 80?ª+ degrees C (gas hourly space velocity (GHSV) of 5308?ª+h(-1)), varied as follows: Ag-1.5%-MnO(2)/Eggshell-R (9.4) >?ª+Ag-3%-MnO(2)/Eggshell-R (8.1) >?ª+Ag-1.5%-MnO(2)/Eggshell (7.5) >?ª+Ag-5%-MnO(2)/Eggshell-R (7.2) >?ª+Ag-1.5%-MnO(2)/CaCO(3)-R (6.8) >?ª+MnO(2)-R (6) >?ª+Ag-0.5%-MnO(2)/Eggshell-R (3.2) >?ª+Ag/Eggshell-R (2.6). (Here, 'R' denotes hydrogen-based thermochemical reduction pretreatment.) The temperature required for 90% FA conversion (T(90)) at the same GHSV exhibited a contrary ordering: Ag/Eggshell-R (175?ª+ degrees C) >?ª+Ag-0.5%-MnO(2)/Eggshell-R (123?ª+ degrees C) >?ª+Ag-5%-MnO(2)/Eggshell-R (113?ª+ degrees C) >?ª+MnO(2)-R (99?ª+ degrees C) >?ª+Ag-1.5%-MnO(2)/Eggshell (96?ª+ degrees C) >?ª+Ag-3%-MnO(2)/Eggshell-R (93?ª+ degrees C) >?ª+Ag-1.5%-MnO(2)/Eggshell-R (77?ª+ degrees C). The eggshell catalyst outperformed the ones made of commercial calcium carbonate due to the presence of defects in the former. The MnO(2) co-catalyst enhances the catalytic activities through the capture and activation of atmospheric oxygen (O(2)) with rapid catalytic regeneration. Also, MnO(2) favorably captures the hydrogen of the adsorbed FA molecules to make the oxidation pathway thermodynamically more favorable" |
| Keywords: | Animals Catalysis Egg Shell Formaldehyde Gases Hydrogen *Manganese Compounds/chemistry Oxidative Stress *Oxides/chemistry Oxygen/chemistry Silver/chemistry Temperature Catalytic oxidation Indoor air Solid biowaste Volatile organic compounds; |
| Notes: | "MedlineVikrant, Kumar Kim, Ki-Hyun Dong, Fan Heynderickx, Philippe M Boukhvalov, Danil W eng Research Support, Non-U.S. Gov't Netherlands 2022/04/17 J Hazard Mater. 2022 Jul 15; 434:128857. doi: 10.1016/j.jhazmat.2022.128857. Epub 2022 Apr 8" |
