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* (Corresponding Author), Xiaoming Cao, Lirong Zheng, Yuewu Zeng, James A. Anderson (Corresponding Author)

*Corresponding author for this work

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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 languageEnglish
Pages (from-to)81-87
Number of pages7
JournalApplied Catalysis B: Environmental
Volume229
Early online date9 Feb 2018
DOIs
Publication statusPublished - 5 Aug 2018

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

Cite this

Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability. / Xin, Ying; Zhang, Nana; Li, Qian; Zhang, Zhaoliang (Corresponding Author); Cao, Xiaoming; Zheng, Lirong; Zeng, Yuewu; Anderson, James A. (Corresponding Author).

In: Applied Catalysis B: Environmental, Vol. 229, 05.08.2018, p. 81-87.

Research output: Contribution to journalArticle

Xin, Ying ; Zhang, Nana ; Li, Qian ; Zhang, Zhaoliang ; Cao, Xiaoming ; Zheng, Lirong ; Zeng, Yuewu ; Anderson, James A. / Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability. In: Applied Catalysis B: Environmental. 2018 ; Vol. 229. pp. 81-87.
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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.",
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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).",
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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.

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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

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JO - Applied Catalysis B: Environmental

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SN - 0926-3373

ER -