Improvement of Ce-Nb doping on low-temperature catalytic activity of a VOx-based catalyst for NH3-SCR reaction

Authors
Jung, Min GieAn, Hyo JinJun Woo JhoLee, Jung-HyunHa, Heon PhilLee, HwajunKwon, Dong Wook
Issue Date
2024-05
Publisher
Elsevier BV
Citation
Applied Surface Science, v.655
Abstract
A series of VxCeNbTi catalysts were prepared using a wet impregnation method for selective catalytic reduction (SCR) of NO by NH3. The influence of Cesingle bondNb addition to VTi was investigated in terms of active sites and acidity. The correlation between surface properties, catalyst structure, and performance with the addition of Ce and/or Nb was demonstrated. The composition of VCeNbTi species, surface acid properties, and redox behavior were studied. Results showed that the addition of 2Cesingle bondNb to VTi increased NH3 adsorption, and brought about positive changes in Br?nsted acid sites and composition of surface species. Nbn+ mainly existed as typical Nb2O5 species, forming abundant acid sites and defects on the catalyst surface, closely related to the distribution of VOx species which varied with ceria content. The presence of 2Cesingle bondNb induced electron redistribution, promoting oxygen defects and reactive oxygen species formation due to the occupancy of high Vn+ (n = 4, 3). The increased proportion of Vn+ (n = 4, 3) improved catalytic activity by generating active groups on the catalyst surface. The introduction of 2Cesingle bondNb enhanced SCR performance with increased NO2 generation. V2CeNbTi exhibited improved resistance in the presence of SO2/H2O, crucial for high-performance and durable catalysis.
Keywords
SO2 RESISTANCE; OXIDE CATALYST; REDUCTION; NOX; NH3; PERFORMANCE; CERIA; SURFACE; SCR; MECHANISM; NOx reduction; Niobium oxide; Cerium oxide; SO2 resistance; VCeNbTi
ISSN
0169-4332
URI
https://pubs.kist.re.kr/handle/201004/148629
DOI
10.1016/j.apsusc.2024.159571
Appears in Collections:
KIST Article > 2024
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE