TY - JOUR
T1 - Cobalt nanoparticles encapsulated in porous nitrogen-doped carbon
T2 - Oxygen activation and efficient catalytic removal of formaldehyde at room temperature
AU - Zhu, Dandan
AU - Huang, Yu
AU - Cao, Jun ji
AU - Lee, Shun Cheng
AU - Chen, Meijuan
AU - Shen, Zhenxing
PY - 2019/12/5
Y1 - 2019/12/5
N2 - The removal of carcinogenic formaldehyde (HCHO) to improve indoor air quality has attracted significant attention. Designing efficient catalysts for practical HCHO oxidation without use of noble metals remains challenging. In this study, metallic Co nanoparticles were encapsulated with porous nitrogen-doped carbon (Co@NC). This catalyst achieved HCHO elimination at room temperature for the first time. The as-prepared Co@NC catalyst exhibited superior catalytic activity (>80%) for HCHO removal compared with the oxidized one, and possessed the excellent stability. Theoretical calculations showed that the metallic Co in Co@NC is the active site for O2 dissociation, which enhanced the catalytic activity compared to traditional transition-metal oxides, such as Co3O4 with the high-valence state Co3+ providing active sites. The formate species was the main intermediate, which was further oxidized to CO2 as the final product. Hence, an efficient non-noble-metal catalyst for room-temperature HCHO oxidation was developed.
AB - The removal of carcinogenic formaldehyde (HCHO) to improve indoor air quality has attracted significant attention. Designing efficient catalysts for practical HCHO oxidation without use of noble metals remains challenging. In this study, metallic Co nanoparticles were encapsulated with porous nitrogen-doped carbon (Co@NC). This catalyst achieved HCHO elimination at room temperature for the first time. The as-prepared Co@NC catalyst exhibited superior catalytic activity (>80%) for HCHO removal compared with the oxidized one, and possessed the excellent stability. Theoretical calculations showed that the metallic Co in Co@NC is the active site for O2 dissociation, which enhanced the catalytic activity compared to traditional transition-metal oxides, such as Co3O4 with the high-valence state Co3+ providing active sites. The formate species was the main intermediate, which was further oxidized to CO2 as the final product. Hence, an efficient non-noble-metal catalyst for room-temperature HCHO oxidation was developed.
KW - Catalytic oxidation
KW - HCHO removal
KW - Metallic Co nanoparticles
KW - Porous nitrogen-doped carbon
UR - http://www.scopus.com/inward/record.url?scp=85069737518&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2019.117981
DO - 10.1016/j.apcatb.2019.117981
M3 - Journal article
AN - SCOPUS:85069737518
SN - 0926-3373
VL - 258
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 117981
ER -