TY - JOUR
T1 - Thin-felt Al-fiber-structured Pd-Co-MnO x /Al 2 O 3 catalyst with high moisture resistance for high-throughput O 3 decomposition
AU - Tao, Longgang
AU - Zhang, Zhiqiang
AU - Chen, Pengjing
AU - Zhao, Guofeng
AU - Liu, Ye
AU - Lu, Yong
N1 - Publisher Copyright:
© 2019
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Thin-felt microfibrous-structured Pd-Co-MnO x /Al 2 O 3 /Al-fiber catalysts (named Pd-Co-MnO x -Al) with low Pd-loading engineered from micro- to macro-scale are developed for the high-throughput catalytic decomposition of high level gaseous ozone (O 3 ) under humid conditions. The catalysts are obtained by highly dispersing Pd-Co-Mn active components onto the γ-Al 2 O 3 nanosheets endogenously grown on the thin-felt microfibrous structure consisting of 10 vol% 60 μm-Al-fiber and 90 vol% voidage, using impregnation method. This approach effectively and efficiently couples the unique form factor, thin-sheet feature, and high permeability with the high activity, markedly improved stability, and enhanced moisture resistance. The most promising 0.1Pd-Co-MnO x -Al (0.1 wt% Pd, 0.36 Co/Mn molar ratio, Co 2 O 3 + MnO 2 loading of 5 wt%) catalyst remains full O 3 conversion for at least 4 h at 25 °C for a feed gas containing 1500 ± 45 ppm O 3 even at a high relative humidity (RH) of 70%, using a high gas hourly space velocity of 48,000 mL g cat. –1 h –1 ; the full O 3 conversion quickly slides to a flat of ~96% during 4 h testing at 90% RH whereas it is retrievable immediately after switching the feed gas to a dry one. The remarkable improvement of activity, stability and moisture resistance by Pd-doping of Co-MnO x -Al is, in nature, due to the highly improved and stabilized low-valent-Mn related oxygen vacancies (i.e., active sites) and markedly weakened H 2 O adsorption on the catalyst surface, which are verified by XRD, H 2 -TPR, O 2 -TPD, H 2 O-TPD and XPS measurements.
AB - Thin-felt microfibrous-structured Pd-Co-MnO x /Al 2 O 3 /Al-fiber catalysts (named Pd-Co-MnO x -Al) with low Pd-loading engineered from micro- to macro-scale are developed for the high-throughput catalytic decomposition of high level gaseous ozone (O 3 ) under humid conditions. The catalysts are obtained by highly dispersing Pd-Co-Mn active components onto the γ-Al 2 O 3 nanosheets endogenously grown on the thin-felt microfibrous structure consisting of 10 vol% 60 μm-Al-fiber and 90 vol% voidage, using impregnation method. This approach effectively and efficiently couples the unique form factor, thin-sheet feature, and high permeability with the high activity, markedly improved stability, and enhanced moisture resistance. The most promising 0.1Pd-Co-MnO x -Al (0.1 wt% Pd, 0.36 Co/Mn molar ratio, Co 2 O 3 + MnO 2 loading of 5 wt%) catalyst remains full O 3 conversion for at least 4 h at 25 °C for a feed gas containing 1500 ± 45 ppm O 3 even at a high relative humidity (RH) of 70%, using a high gas hourly space velocity of 48,000 mL g cat. –1 h –1 ; the full O 3 conversion quickly slides to a flat of ~96% during 4 h testing at 90% RH whereas it is retrievable immediately after switching the feed gas to a dry one. The remarkable improvement of activity, stability and moisture resistance by Pd-doping of Co-MnO x -Al is, in nature, due to the highly improved and stabilized low-valent-Mn related oxygen vacancies (i.e., active sites) and markedly weakened H 2 O adsorption on the catalyst surface, which are verified by XRD, H 2 -TPR, O 2 -TPD, H 2 O-TPD and XPS measurements.
KW - Cobalt
KW - Manganese
KW - O decomposition
KW - Palladium
KW - Process intensification
KW - Structured catalyst
UR - https://www.scopus.com/pages/publications/85063127680
U2 - 10.1016/j.apsusc.2019.03.134
DO - 10.1016/j.apsusc.2019.03.134
M3 - 文章
AN - SCOPUS:85063127680
SN - 0169-4332
VL - 481
SP - 802
EP - 810
JO - Applied Surface Science
JF - Applied Surface Science
ER -