TY - JOUR
T1 - Mesoporous Mn-Ti amorphous oxides
T2 - A robust low-temperature NH3-SCR catalyst
AU - Yang, Yanran
AU - Wang, Minghong
AU - Tao, Zuliang
AU - Liu, Qing
AU - Fei, Zhaoyang
AU - Chen, Xian
AU - Zhang, Zhuxiu
AU - Tang, Jihai
AU - Cui, Mifen
AU - Qiao, Xu
N1 - Publisher Copyright:
© 2018 The Royal Society of Chemistry.
PY - 2018
Y1 - 2018
N2 - A series of mesoporous Mn-Ti amorphous oxides (MnaTi1-a) fabricated by a combined strategy of in situ deposition and freeze-drying were studied for the selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperature. The physico-chemical properties of MnaTi1-a catalysts were characterized systematically by XRD, TEM, Raman, EXAFS, N2-sorption, XPS, H2-TPR and NH3-TPD. The results revealed that the increased amount of Mn4+ species greatly promoted the NO conversion at low temperature. Additionally, the highly dispersed active sites, abundant surface Lewis acid sites and strong interaction between Mn and Ti contributed to the remarkable low-temperature SCR activity. Among these MnaTi1-a catalysts, the Mn0.5Ti0.5 catalyst exhibited the best low-temperature NH3-SCR performance (61% NO conversion at 100 °C and over 95% N2 selectivity at 150-250 °C) and excellent H2O/SO2 durability. In situ FTIR was used to investigate the reaction mechanism, and the results indicated that both the L-H and E-R mechanisms were present and NH3-SCR mainly proceeded via the L-H reaction pathway at low temperature.
AB - A series of mesoporous Mn-Ti amorphous oxides (MnaTi1-a) fabricated by a combined strategy of in situ deposition and freeze-drying were studied for the selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperature. The physico-chemical properties of MnaTi1-a catalysts were characterized systematically by XRD, TEM, Raman, EXAFS, N2-sorption, XPS, H2-TPR and NH3-TPD. The results revealed that the increased amount of Mn4+ species greatly promoted the NO conversion at low temperature. Additionally, the highly dispersed active sites, abundant surface Lewis acid sites and strong interaction between Mn and Ti contributed to the remarkable low-temperature SCR activity. Among these MnaTi1-a catalysts, the Mn0.5Ti0.5 catalyst exhibited the best low-temperature NH3-SCR performance (61% NO conversion at 100 °C and over 95% N2 selectivity at 150-250 °C) and excellent H2O/SO2 durability. In situ FTIR was used to investigate the reaction mechanism, and the results indicated that both the L-H and E-R mechanisms were present and NH3-SCR mainly proceeded via the L-H reaction pathway at low temperature.
UR - http://www.scopus.com/inward/record.url?scp=85058435311&partnerID=8YFLogxK
U2 - 10.1039/c8cy01313f
DO - 10.1039/c8cy01313f
M3 - 文章
AN - SCOPUS:85058435311
SN - 2044-4753
VL - 8
SP - 6396
EP - 6406
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 24
ER -