Research on the fabrication and evaluation of the characteristics of Hopcalite materials

Bùi Văn Tài; Trần Văn Chung; Anh Tuan Hoang; Van Tu Nguyen; Thị Thu Hương Nguyễn

doi:10.62239/jca.2026.010

Authors

Bui Van Tai Institute of Materials, Biology and Environment, 17 Hoang Sam, Nghia Do, Hanoi, Vietnam
Tran Van Chung Institute of Materials, Biology and Environment, 17 Hoang Sam, Nghia Do, Hanoi, Vietnam
Hoang Anh Tuan Institute of Materials, Biology and Environment, 17 Hoang Sam, Nghia Do, Hanoi, Vietnam
Nguyen Van Tu Institute of Materials, Biology and Environment, 17 Hoang Sam, Nghia Do, Hanoi, Vietnam
Nguyen Thi Thu Huong Institute of Materials, Biology and Environment, 17 Hoang Sam, Nghia Do, Hanoi, Vietnam

DOI:

https://doi.org/10.62239/jca.2026.010

Keywords:

Hopcalite, protection time, porosity

Abstract

This study investigates the synthesis of hopcalite catalyst via the sol-gel method for low-temperature carbon monoxide (CO) oxidation. Using Mn(CH₃COO)₂.2H₂O and Cu(NO₃)₂.3H₂O as precursors, the optimal fabrication conditions were determined as a Mn/Cu molar ratio of 0.65, pH 8, and calcination at 350°C for 180 minutes. Characterization through SEM-EDS, XRD, FT-IR, and BET confirmed that the synthesized material has a specific surface area of 199 m²/g, a pore volume of 0.4 cm³/g, and mesoporous sizes between 2-50 nm. Performance testing on a DPC5 dynamic adsorption device showed a CO protection time of 16 minutes at a 10,000 ppm concentration. These results demonstrate that sol-gel-derived hopcalite is a highly effective catalyst for CO filtration in specialized respiratory protection equipment.

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