TY - JOUR
T1 - Catalytic behavior and synergistic effect of nanostructured mesoporous CuO-MnO x -CeO 2 catalysts for chlorobenzene destruction
AU - He, Chi
AU - Yu, Yanke
AU - Shen, Qun
AU - Chen, Jinsheng
AU - Qiao, Nanli
PY - 2014/4/1
Y1 - 2014/4/1
N2 - Mesoporous CuO-MnO x -CeO 2 composite metal oxides with different copper and manganese loadings were prepared by a urea-assistant hydrothermal method, and were further adopted for the complete catalytic combustion of chlorobenzene. The effects of reaction conditions such as inlet reagent concentration and water feed concentration on chlorobenzene combustion were also studied. The structure and textural properties of the synthesized catalysts were characterized via the XRD, N 2 adsorption/desorption, FE-SEM, TEM, H 2 -TPR, O 2 -TPD, and XPS techniques. The characterization results reveal that the presence of a small amount of Mn species can facilitate the incorporation of Cu and Mn ions into ceria lattice to form Cu-Mn-Ce-O solid solution. The synergistic effect of Cu and Mn species can reduce the redox potential of the composite catalysts, and produce large amounts of oxygen vacancies in the interface of CuO x , MnO x , and CeO 2 oxides. The catalyst with Cu/Mn atomic ratio of 1/1 exhibits the best chlorobenzene elimination capability, oxidizing about 95% of the inlet chlorobenzene at 264 C with CO 2 selectivity higher than 99.5%. The concentration and mobility of the chemically adsorbed oxygen are vital for the effective removal of surface Cl species, which inhibits the dissociation of oxygen molecules and decreases the reducibility of the copper and manganese species. It can be rationally concluded that the superior catalytic performance and durability of the mesoporous CuO-MnO x -CeO 2 composite oxides are primarily attributed to the higher surface oxygen concentration and better active oxygen mobility.
AB - Mesoporous CuO-MnO x -CeO 2 composite metal oxides with different copper and manganese loadings were prepared by a urea-assistant hydrothermal method, and were further adopted for the complete catalytic combustion of chlorobenzene. The effects of reaction conditions such as inlet reagent concentration and water feed concentration on chlorobenzene combustion were also studied. The structure and textural properties of the synthesized catalysts were characterized via the XRD, N 2 adsorption/desorption, FE-SEM, TEM, H 2 -TPR, O 2 -TPD, and XPS techniques. The characterization results reveal that the presence of a small amount of Mn species can facilitate the incorporation of Cu and Mn ions into ceria lattice to form Cu-Mn-Ce-O solid solution. The synergistic effect of Cu and Mn species can reduce the redox potential of the composite catalysts, and produce large amounts of oxygen vacancies in the interface of CuO x , MnO x , and CeO 2 oxides. The catalyst with Cu/Mn atomic ratio of 1/1 exhibits the best chlorobenzene elimination capability, oxidizing about 95% of the inlet chlorobenzene at 264 C with CO 2 selectivity higher than 99.5%. The concentration and mobility of the chemically adsorbed oxygen are vital for the effective removal of surface Cl species, which inhibits the dissociation of oxygen molecules and decreases the reducibility of the copper and manganese species. It can be rationally concluded that the superior catalytic performance and durability of the mesoporous CuO-MnO x -CeO 2 composite oxides are primarily attributed to the higher surface oxygen concentration and better active oxygen mobility.
KW - Catalyst deactivation
KW - Catalytic combustion
KW - Chlorobenzene
KW - Reaction conditions
KW - Synergistic effect
UR - https://www.scopus.com/pages/publications/84894638094
U2 - 10.1016/j.apsusc.2014.01.076
DO - 10.1016/j.apsusc.2014.01.076
M3 - 文章
AN - SCOPUS:84894638094
SN - 0169-4332
VL - 297
SP - 59
EP - 69
JO - Applied Surface Science
JF - Applied Surface Science
ER -