PMID- 35926302
OWN - NLM
STAT- MEDLINE
DCOM- 20221011
LR  - 20221011
IS  - 1095-7103 (Electronic)
IS  - 0021-9797 (Linking)
VI  - 628
IP  - Pt A
DP  - 2022 Dec 15
TI  - Reveal of free radicals in manganese-based catalysts and their roles during 
      selective catalytic reduction of nitrogen oxide.
PG  - 193-204
LID - S0021-9797(22)01273-5 [pii]
LID - 10.1016/j.jcis.2022.07.093 [doi]
AB  - HYPOTHESIS: Manganese-based catalysts attract extensive attentions in 
      low-temperature selective catalytic reduction (SCR) of nitrogen oxide (NO(x)). 
      However, seldom work focuses on the existence of free radicals and their roles in 
      SCR. EXPERIMENTS: In this work, electron paramagnetic resonance spectrometer and 
      density functional theory are combined to reveal surface characterizations of 
      manganese oxide and Ce/La-doped manganese oxides. FINDINGS: As a result, 
      superoxide radical (O(2)*) exists on manganese-oxide surface, produces 
      nitrogen-containing free radical, and functions as electron transfer between 
      NO(x) and NH(3) at 100  degrees C, resulting in good NO(x) conversion as well as N(2) 
      selectivity at the same time. The O(2)* is born of accepting electrons on 
      adsorbed oxygen through overlapped orbits of Mn-d and O-p. Additional metal 
      doping increases the percentage of O(2)* among all oxygen species from 2.9 % to 
      6.9 % (Ce doping) and 5.1 % (La doping). The order of O(2)* percentage is 
      consistent with the NO(x)-conversion order at 100  degrees C, i.e., Ce doping 
      (91.6 %) > La doping (55.7 %) > catalyst without doping (27.5 %). Above result 
      helps to understand interface behaviors of manganese-based catalyst in SCR. This 
      work is also in favor of developing more effective low-temperature catalysts.
CI  - Copyright (c) 2022 Elsevier Inc. All rights reserved.
FAU - Hou, Luman
AU  - Hou L
AD  - Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 
      200444, China.
FAU - Wen, Yuling
AU  - Wen Y
AD  - SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and 
      Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, 
      China.
FAU - Wu, Jianzhong
AU  - Wu J
AD  - Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 
      200444, China.
FAU - Yue, Yang
AU  - Yue Y
AD  - Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 
      200444, China.
FAU - Zhang, Jia
AU  - Zhang J
AD  - SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and 
      Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, 
      China. Electronic address: irujam@t.shu.edu.cn.
FAU - Zhang, Jincang
AU  - Zhang J
AD  - Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 
      200444, China. Electronic address: jczhang@shu.edu.cn.
FAU - Qian, Guangren
AU  - Qian G
AD  - Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 
      200444, China.
LA  - eng
PT  - Journal Article
DEP - 20220718
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
RN  - 0 (Ions)
RN  - 0 (Manganese Compounds)
RN  - 0 (Nitrogen Oxides)
RN  - 0 (Oxides)
RN  - 11062-77-4 (Superoxides)
RN  - 31C4KY9ESH (Nitric Oxide)
RN  - 42Z2K6ZL8P (Manganese)
RN  - 64J2OA7MH3 (manganese oxide)
RN  - 7664-41-7 (Ammonia)
RN  - N762921K75 (Nitrogen)
RN  - S88TT14065 (Oxygen)
SB  - IM
MH  - Ammonia
MH  - Catalysis
MH  - Ions
MH  - *Manganese
MH  - Manganese Compounds
MH  - Nitric Oxide
MH  - Nitrogen
MH  - Nitrogen Oxides
MH  - Oxidation-Reduction
MH  - Oxides
MH  - Oxygen
MH  - *Superoxides
MH  - Temperature
OTO - NOTNLM
OT  - Manganese oxide
OT  - Nitrogen oxide
OT  - Nitrogen-containing free radical
OT  - Selective catalytic reduction
OT  - Superoxide radical
COIS- Declaration of Competing Interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2022/08/05 06:00
MHDA- 2022/10/12 06:00
CRDT- 2022/08/04 18:19
PHST- 2022/04/23 00:00 [received]
PHST- 2022/06/07 00:00 [revised]
PHST- 2022/07/15 00:00 [accepted]
PHST- 2022/08/05 06:00 [pubmed]
PHST- 2022/10/12 06:00 [medline]
PHST- 2022/08/04 18:19 [entrez]
AID - S0021-9797(22)01273-5 [pii]
AID - 10.1016/j.jcis.2022.07.093 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2022 Dec 15;628(Pt A):193-204. doi: 
      10.1016/j.jcis.2022.07.093. Epub 2022 Jul 18.