Metal oxide/activated carbon composites for the reactive adsorption and catalytic oxidation of formaldehyde and toluene in air
- Authors
- Kim, Won-Ki; Vikrant, Kumar; Younis, Sherif A.; Kim, Ki-Hyun; Heynderickx, Philippe M.
- Issue Date
- Feb-2023
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Manganese dioxide catalyst; Activated carbon; Reactive adsorption; Thermal catalysis; Volatile organic compounds
- Citation
- JOURNAL OF CLEANER PRODUCTION, v.387, pp.1 - 17
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF CLEANER PRODUCTION
- Volume
- 387
- Start Page
- 1
- End Page
- 17
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185062
- DOI
- 10.1016/j.jclepro.2023.135925
- ISSN
- 0959-6526
- Abstract
- The synergistic effect of ‘reactive adsorption and catalytic oxidation (RACO)’ has been investigated to develop an efficient method to remove volatile organic compounds (VOCs: formaldehyde (FA) + toluene) using an amorphous-manganese dioxide-activated carbon (Am-MnO2-AC) composite. The RACO of FA and toluene onto Am-MnO2-AC was examined individually and as a mixture at multiple-isothermal conditions from room temperature (RT) to 300 °C. At RT, the values for 10% adsorption breakthrough volume (BTV10%) of single FA and toluene by Am-MnO2-AC were 45.9 and 152 L g−1, respectively, approx. 1.3-fold higher than those for their mixture. The BTV10% values for FA measured in single and mixture were 270–280 times higher than their pristine AC counterparts. The RACO performance of Am-MnO2-AC was investigated more intensively against a dual component system in reference to its crystalline forms (e.g., δ-MnO2) and two other metal-doped forms (i.e., cobalt and silver). Accordingly, Am-MnO2-AC exhibited the highest catalytic reactivity so as to achieve the complete oxidation of FA and toluene (as individual components) into carbon dioxide (CO2) at 100 and 275 °C, respectively. The thermal catalytic oxidation of FA and toluene onto Am-MnO2-AC was suggested to follow the Langmuir-Hinshelwood mechanism. The enhanced RACO performance of Am-MnO2-AC was ascribed to its higher surface porosity and higher concentration of oxygen vacancies (e.g., Mn3+/Mn4+ of 0.707 and adsorbed oxygen (OA)/lattice oxygen (OL) of 1.79). The present study is expected to provide deep insights into the practical application of metal oxide/AC composites for cleaner indoor air quality.
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