TY - JOUR
T1 - Effect of calcination temperature on structural properties and catalytic soot combustion activity of MnO x /wire-mesh monoliths
AU - Chen, Li
AU - Liu, Geng
AU - Feng, Nengjie
AU - Yu, Jiahuan
AU - Meng, Jie
AU - Fang, Fan
AU - Zhao, Peng
AU - Wang, Lei
AU - Wan, Hui
AU - Guan, Guofeng
N1 - Publisher Copyright:
© 2018
PY - 2019/2/15
Y1 - 2019/2/15
N2 - Manganese Oxides (MnO x ) growing on AISI304 stainless steel wire-mesh monoliths with excellent catalytic performance and firm adhesion were synthesized via a hydrothermal route. The effect of calcination temperatures was deeply investigated. Systematic characterizations including XRD, Raman spectra, FT-IR, N 2 adsorption-desorption, SEM, HRSTEM-EDS, XPS, H 2 -TPR, CO-TPR, O 2 -TPD, Soot-TPR and ultrasound tests were conducted. With temperature increasing from 500 to 800 °C, the coating phase changes from α-MnO 2 nanorods to MnCrO 3 nanoblocks. Besides, MnCrO 3 can tightly bond MnO 2 with substrate as an interphase, and it also remarkably accelerates soot oxidation. The specimen calcined at 550 °C (MSS550) shows hierarchical pore structure with abundant accessible sites and more potassium content than MSS500 and MSS600. MSS700 presents the most surface oxygen species, high-valence metal elements and bulk potassium, thus showing the best activity. K + would effectively activate gas O 2 forming O 2 − , O 2 2− and improve the redox properties while Cr 6+ and Fe 3+ dopants would generate numerous oxygen vacancies and intensify stability. Moreover, MSS700 displays good stability and catalytic activity under repeatability test and ultrasonic treatment. The exfoliation rates of all the samples are only 0.08 ± 0.03 wt%. This series of catalysts may satisfy the harsh conditions of active regeneration and show excellent performance for passive regeneration.
AB - Manganese Oxides (MnO x ) growing on AISI304 stainless steel wire-mesh monoliths with excellent catalytic performance and firm adhesion were synthesized via a hydrothermal route. The effect of calcination temperatures was deeply investigated. Systematic characterizations including XRD, Raman spectra, FT-IR, N 2 adsorption-desorption, SEM, HRSTEM-EDS, XPS, H 2 -TPR, CO-TPR, O 2 -TPD, Soot-TPR and ultrasound tests were conducted. With temperature increasing from 500 to 800 °C, the coating phase changes from α-MnO 2 nanorods to MnCrO 3 nanoblocks. Besides, MnCrO 3 can tightly bond MnO 2 with substrate as an interphase, and it also remarkably accelerates soot oxidation. The specimen calcined at 550 °C (MSS550) shows hierarchical pore structure with abundant accessible sites and more potassium content than MSS500 and MSS600. MSS700 presents the most surface oxygen species, high-valence metal elements and bulk potassium, thus showing the best activity. K + would effectively activate gas O 2 forming O 2 − , O 2 2− and improve the redox properties while Cr 6+ and Fe 3+ dopants would generate numerous oxygen vacancies and intensify stability. Moreover, MSS700 displays good stability and catalytic activity under repeatability test and ultrasonic treatment. The exfoliation rates of all the samples are only 0.08 ± 0.03 wt%. This series of catalysts may satisfy the harsh conditions of active regeneration and show excellent performance for passive regeneration.
KW - Adhesion
KW - Calcination temperature
KW - MnCrO
KW - Monoliths
KW - Soot combustion
UR - http://www.scopus.com/inward/record.url?scp=85055882989&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2018.10.223
DO - 10.1016/j.apsusc.2018.10.223
M3 - 文章
AN - SCOPUS:85055882989
SN - 0169-4332
VL - 467-468
SP - 1088
EP - 1103
JO - Applied Surface Science
JF - Applied Surface Science
ER -