Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability

Ying Xin; Nana Zhang; Qian Li; Zhaoliang Zhang; Xiaoming Cao; Lirong Zheng; Yuewu Zeng; James A. Anderson

doi:10.1016/j.apcatb.2018.02.012

Selective catalytic reduction of NO_x with NH₃ over short-range ordered W-O-Fe structures with high thermal stability

Ying Xin, Nana Zhang, Qian Li, Zhaoliang Zhang^* (Corresponding Author), Xiaoming Cao, Lirong Zheng, Yuewu Zeng, James A. Anderson^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The selective catalytic reduction (SCR) of NOx with NH3 was studied over poorly-crystalline W-Fe composite oxides (WaFeOx). The short-range order present within the W-O-Fe structure was found to be responsible for the excellent SCR activity, in which the strong atomic-level interaction between Fe and W atoms promoted the formation of both Lewis and Brønsted acidity. The W-O-Fe structure existed as amorphous overlayers, approximately 2 nm thick over the surface of crystalline particles after high-temperature aging as shown by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). After treatment at 800oC for 5 h, the WaFeOx catalysts still showed almost 100% NO conversion in the range 300-450oC with 100% N2 selectivity, despite the loss in surface area. This resistance to the impacts of high temperature ageing guarantees high activity of SCR catalysts which often suffer during high-temperature excursions as in the case of diesel exhaust due to diesel particulate filter (DPF) regeneration.

Original language	English
Pages (from-to)	81-87
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	229
Early online date	9 Feb 2018
DOIs	https://doi.org/10.1016/j.apcatb.2018.02.012
Publication status	Published - 5 Aug 2018

Bibliographical note

This work was supported by National Natural Science Foundation of China (Nos. 21477046, 21333003, and 21673072) and Key Technology R&D Program of Shandong Province (No. 2016ZDJS11A03).

Keywords

Nitrogen oxides
Selective catalytic reduction
Ammonia
Short-range order
High thermal stability
IRON TITANATE CATALYST
TI AMORPHOUS OXIDES
IN-SITU IR
NITRIC-OXIDE
TEMPERATURE-RANGE
CE/TIO2 CATALYST
ACTIVE-SITES
MIXED OXIDES
THE-ART
AMMONIA

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Accepted author manuscript, 1.72 MBLicence: CC BY-NC-ND
Supplementary Information
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Cite this

@article{68a4203297534e0aa0b02f83768ca625,

title = "Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability",

abstract = "The selective catalytic reduction (SCR) of NOx with NH3 was studied over poorly-crystalline W-Fe composite oxides (WaFeOx). The short-range order present within the W-O-Fe structure was found to be responsible for the excellent SCR activity, in which the strong atomic-level interaction between Fe and W atoms promoted the formation of both Lewis and Br{\o}nsted acidity. The W-O-Fe structure existed as amorphous overlayers, approximately 2 nm thick over the surface of crystalline particles after high-temperature aging as shown by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). After treatment at 800oC for 5 h, the WaFeOx catalysts still showed almost 100% NO conversion in the range 300-450oC with 100% N2 selectivity, despite the loss in surface area. This resistance to the impacts of high temperature ageing guarantees high activity of SCR catalysts which often suffer during high-temperature excursions as in the case of diesel exhaust due to diesel particulate filter (DPF) regeneration.",

keywords = "Nitrogen oxides, Selective catalytic reduction, Ammonia, Short-range order, High thermal stability, IRON TITANATE CATALYST, TI AMORPHOUS OXIDES, IN-SITU IR, NITRIC-OXIDE, TEMPERATURE-RANGE, CE/TIO2 CATALYST, ACTIVE-SITES, MIXED OXIDES, THE-ART, AMMONIA",

author = "Ying Xin and Nana Zhang and Qian Li and Zhaoliang Zhang and Xiaoming Cao and Lirong Zheng and Yuewu Zeng and Anderson, {James A.}",

note = "This work was supported by National Natural Science Foundation of China (Nos. 21477046, 21333003, and 21673072) and Key Technology R&D Program of Shandong Province (No. 2016ZDJS11A03).",

year = "2018",

month = aug,

day = "5",

doi = "10.1016/j.apcatb.2018.02.012",

language = "English",

volume = "229",

pages = "81--87",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier Science B. V.",

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TY - JOUR

T1 - Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability

AU - Xin, Ying

AU - Zhang, Nana

AU - Li, Qian

AU - Zhang, Zhaoliang

AU - Cao, Xiaoming

AU - Zheng, Lirong

AU - Zeng, Yuewu

AU - Anderson, James A.

N1 - This work was supported by National Natural Science Foundation of China (Nos. 21477046, 21333003, and 21673072) and Key Technology R&D Program of Shandong Province (No. 2016ZDJS11A03).

PY - 2018/8/5

Y1 - 2018/8/5

N2 - The selective catalytic reduction (SCR) of NOx with NH3 was studied over poorly-crystalline W-Fe composite oxides (WaFeOx). The short-range order present within the W-O-Fe structure was found to be responsible for the excellent SCR activity, in which the strong atomic-level interaction between Fe and W atoms promoted the formation of both Lewis and Brønsted acidity. The W-O-Fe structure existed as amorphous overlayers, approximately 2 nm thick over the surface of crystalline particles after high-temperature aging as shown by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). After treatment at 800oC for 5 h, the WaFeOx catalysts still showed almost 100% NO conversion in the range 300-450oC with 100% N2 selectivity, despite the loss in surface area. This resistance to the impacts of high temperature ageing guarantees high activity of SCR catalysts which often suffer during high-temperature excursions as in the case of diesel exhaust due to diesel particulate filter (DPF) regeneration.

AB - The selective catalytic reduction (SCR) of NOx with NH3 was studied over poorly-crystalline W-Fe composite oxides (WaFeOx). The short-range order present within the W-O-Fe structure was found to be responsible for the excellent SCR activity, in which the strong atomic-level interaction between Fe and W atoms promoted the formation of both Lewis and Brønsted acidity. The W-O-Fe structure existed as amorphous overlayers, approximately 2 nm thick over the surface of crystalline particles after high-temperature aging as shown by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). After treatment at 800oC for 5 h, the WaFeOx catalysts still showed almost 100% NO conversion in the range 300-450oC with 100% N2 selectivity, despite the loss in surface area. This resistance to the impacts of high temperature ageing guarantees high activity of SCR catalysts which often suffer during high-temperature excursions as in the case of diesel exhaust due to diesel particulate filter (DPF) regeneration.

KW - Nitrogen oxides

KW - Selective catalytic reduction

KW - Ammonia

KW - Short-range order

KW - High thermal stability

KW - IRON TITANATE CATALYST

KW - TI AMORPHOUS OXIDES

KW - IN-SITU IR

KW - NITRIC-OXIDE

KW - TEMPERATURE-RANGE

KW - CE/TIO2 CATALYST

KW - ACTIVE-SITES

KW - MIXED OXIDES

KW - THE-ART

KW - AMMONIA

U2 - 10.1016/j.apcatb.2018.02.012

DO - 10.1016/j.apcatb.2018.02.012

M3 - Article

SN - 0926-3373

VL - 229

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EP - 87

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -