The Effect of NH4OH Concentration on Pore Formation of r-Al2O3 and the Low-Concentration CH4 Oxidation over Co/r-Al2O3 


Vol. 31,  No. 4, pp. 302-311, Dec.  2025
10.7464/ksct.2025.31.4.302


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  Abstract

In this study, a Co/ c-Al2O3 catalyst was synthesized and applied to the complete oxidation reaction of methane in order to thoroughly decompose low-concentrations of methane. A c-Al2O3 catalyst support was synthesized using a precipitation method with an NH₄OH aqueous solution. The concentration of the NH₄OH aqueous solution was varied from 1.0 M to 2.5 M in 0.5 M increments in order to investigate the effect of NH4OH concentration on the pore characteristics of the synthesized support. Using the synthesized c-Al2O3, a 5 wt% Co/ c-Al2O3 catalyst was synthesized via the wet impregnation method. The catalyst activity was measured for the methane oxidation reaction over the temperature range of 200 to 550 oC. The results confirmed that all catalysts exhibited a CH4 conversion rate exceeding 90% at temperatures above 500 oC. At a temperature of 400 oC, the catalyst using the support synthesized with 1.5 M NH4OH aqueous solution showed the highest CH4 conversion rate, followed by those synthesized with 2.5 M, 2.0 M, 1.0 M solutions.

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  Cite this article

[IEEE Style]

K. Chae, K. Choo, H. Jeong, Y. Ko, C. Cho, D. Cho, "The Effect of NH4OH Concentration on Pore Formation of r-Al2O3 and the Low-Concentration CH4 Oxidation over Co/r-Al2O3," Clean Technology, vol. 31, no. 4, pp. 302-311, 2025. DOI: 10.7464/ksct.2025.31.4.302.

[ACM Style]

Kyeongmok Chae, Koyeon Choo, Heon-Do Jeong, Youna Ko, Churl-hee Cho, and Dong-Woo Cho. 2025. The Effect of NH4OH Concentration on Pore Formation of r-Al2O3 and the Low-Concentration CH4 Oxidation over Co/r-Al2O3. Clean Technology, 31, 4, (2025), 302-311. DOI: 10.7464/ksct.2025.31.4.302.

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pISSN : 1598 - 9712
eISSN : 2288 - 0690

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