Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction

Apiwat Dankeaw, Fabrizio Gualandris, Rafael Hubert Silva, Kion Norrman, Mads Gudik-Sørensen, Kent Kammer Hansen, Bussarin Ksapabutr, Vincenzo Esposito*, Debora Marani

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Herein for the first time, Ce0.184W0.07Ti0.748O2-δ nanofibers are prepared by electrospinning to serve as catalyst in the selective catalytic reduction (SCR) process. The addition of cerium is proven to inhibit crystallization of TiO2, yielding an amorphous TiOx-based solid solution stable up to 500 °C in air, with supersaturated substitutional Ce. However, at higher temepratures, anatase phase (titanium oxide) is then observed along with fluorite (cerium oxide). Tungsten is instead demonstrated to promote the reduction of the Ce4+ to Ce3+ with formation of oxygen vacancies (δ). Catalytic experiments at the best working conditions (dry and in absence of SO2) are performed to characterize the intrinsic catalytic behavior of the new catalysts. At temeprature lower than 300 °C, superior NOx conversion properties of the amorphous TiOx nanofibers over the crystallized TiO2 (anatase) nanofibers are obsreved and attributed to higher specific surface area (SSA), larger amount of oxygen vacancies, and higher amount of Ce3+ over the Ce4+. Comparison with literature data for ceria-tungsten-based nanoperticles also points out higher catalytic performances for the the deveoped nanofibers at the lowest temperatures (< 300°C). This is mainly attributed to the unique nanofibrous morpholgy and to the doping approach. Stability of the amorphous Ce-W-TiOx nanofibers over time (120 h) and over a number of cycles (5) is demonstrated. Yet, superior catalytic performances of the developed catalysts in a wide range of temperatures (200-500 °C) over state-of-the-art material V-W-titania nanoparticles and nanofibers are also proven.
Original languageEnglish
JournalNew Journal of Chemistry
Volume42
Issue number12
Pages (from-to)9501-9509
ISSN1144-0546
DOIs
Publication statusPublished - 2018

Cite this

Dankeaw, Apiwat ; Gualandris, Fabrizio ; Silva, Rafael Hubert ; Norrman, Kion ; Gudik-Sørensen, Mads ; Kammer Hansen, Kent ; Ksapabutr, Bussarin ; Esposito, Vincenzo ; Marani, Debora. / Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction. In: New Journal of Chemistry. 2018 ; Vol. 42, No. 12. pp. 9501-9509.
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title = "Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction",
abstract = "Herein for the first time, Ce0.184W0.07Ti0.748O2-δ nanofibers are prepared by electrospinning to serve as catalyst in the selective catalytic reduction (SCR) process. The addition of cerium is proven to inhibit crystallization of TiO2, yielding an amorphous TiOx-based solid solution stable up to 500 °C in air, with supersaturated substitutional Ce. However, at higher temepratures, anatase phase (titanium oxide) is then observed along with fluorite (cerium oxide). Tungsten is instead demonstrated to promote the reduction of the Ce4+ to Ce3+ with formation of oxygen vacancies (δ). Catalytic experiments at the best working conditions (dry and in absence of SO2) are performed to characterize the intrinsic catalytic behavior of the new catalysts. At temeprature lower than 300 °C, superior NOx conversion properties of the amorphous TiOx nanofibers over the crystallized TiO2 (anatase) nanofibers are obsreved and attributed to higher specific surface area (SSA), larger amount of oxygen vacancies, and higher amount of Ce3+ over the Ce4+. Comparison with literature data for ceria-tungsten-based nanoperticles also points out higher catalytic performances for the the deveoped nanofibers at the lowest temperatures (< 300°C). This is mainly attributed to the unique nanofibrous morpholgy and to the doping approach. Stability of the amorphous Ce-W-TiOx nanofibers over time (120 h) and over a number of cycles (5) is demonstrated. Yet, superior catalytic performances of the developed catalysts in a wide range of temperatures (200-500 °C) over state-of-the-art material V-W-titania nanoparticles and nanofibers are also proven.",
author = "Apiwat Dankeaw and Fabrizio Gualandris and Silva, {Rafael Hubert} and Kion Norrman and Mads Gudik-S{\o}rensen and {Kammer Hansen}, Kent and Bussarin Ksapabutr and Vincenzo Esposito and Debora Marani",
year = "2018",
doi = "10.1039/C8NJ00752G",
language = "English",
volume = "42",
pages = "9501--9509",
journal = "New Journal of Chemistry",
issn = "1144-0546",
publisher = "Royal Society of Chemistry",
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Dankeaw, A, Gualandris, F, Silva, RH, Norrman, K, Gudik-Sørensen, M, Kammer Hansen, K, Ksapabutr, B, Esposito, V & Marani, D 2018, 'Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction', New Journal of Chemistry, vol. 42, no. 12, pp. 9501-9509. https://doi.org/10.1039/C8NJ00752G

Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction. / Dankeaw, Apiwat; Gualandris, Fabrizio; Silva, Rafael Hubert ; Norrman, Kion; Gudik-Sørensen, Mads; Kammer Hansen, Kent; Ksapabutr, Bussarin ; Esposito, Vincenzo; Marani, Debora.

In: New Journal of Chemistry, Vol. 42, No. 12, 2018, p. 9501-9509.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Amorphous saturated Cerium-Tungsten-Titanium oxide nanofibers catalysts for NOx selective catalytic reaction

AU - Dankeaw, Apiwat

AU - Gualandris, Fabrizio

AU - Silva, Rafael Hubert

AU - Norrman, Kion

AU - Gudik-Sørensen, Mads

AU - Kammer Hansen, Kent

AU - Ksapabutr, Bussarin

AU - Esposito, Vincenzo

AU - Marani, Debora

PY - 2018

Y1 - 2018

N2 - Herein for the first time, Ce0.184W0.07Ti0.748O2-δ nanofibers are prepared by electrospinning to serve as catalyst in the selective catalytic reduction (SCR) process. The addition of cerium is proven to inhibit crystallization of TiO2, yielding an amorphous TiOx-based solid solution stable up to 500 °C in air, with supersaturated substitutional Ce. However, at higher temepratures, anatase phase (titanium oxide) is then observed along with fluorite (cerium oxide). Tungsten is instead demonstrated to promote the reduction of the Ce4+ to Ce3+ with formation of oxygen vacancies (δ). Catalytic experiments at the best working conditions (dry and in absence of SO2) are performed to characterize the intrinsic catalytic behavior of the new catalysts. At temeprature lower than 300 °C, superior NOx conversion properties of the amorphous TiOx nanofibers over the crystallized TiO2 (anatase) nanofibers are obsreved and attributed to higher specific surface area (SSA), larger amount of oxygen vacancies, and higher amount of Ce3+ over the Ce4+. Comparison with literature data for ceria-tungsten-based nanoperticles also points out higher catalytic performances for the the deveoped nanofibers at the lowest temperatures (< 300°C). This is mainly attributed to the unique nanofibrous morpholgy and to the doping approach. Stability of the amorphous Ce-W-TiOx nanofibers over time (120 h) and over a number of cycles (5) is demonstrated. Yet, superior catalytic performances of the developed catalysts in a wide range of temperatures (200-500 °C) over state-of-the-art material V-W-titania nanoparticles and nanofibers are also proven.

AB - Herein for the first time, Ce0.184W0.07Ti0.748O2-δ nanofibers are prepared by electrospinning to serve as catalyst in the selective catalytic reduction (SCR) process. The addition of cerium is proven to inhibit crystallization of TiO2, yielding an amorphous TiOx-based solid solution stable up to 500 °C in air, with supersaturated substitutional Ce. However, at higher temepratures, anatase phase (titanium oxide) is then observed along with fluorite (cerium oxide). Tungsten is instead demonstrated to promote the reduction of the Ce4+ to Ce3+ with formation of oxygen vacancies (δ). Catalytic experiments at the best working conditions (dry and in absence of SO2) are performed to characterize the intrinsic catalytic behavior of the new catalysts. At temeprature lower than 300 °C, superior NOx conversion properties of the amorphous TiOx nanofibers over the crystallized TiO2 (anatase) nanofibers are obsreved and attributed to higher specific surface area (SSA), larger amount of oxygen vacancies, and higher amount of Ce3+ over the Ce4+. Comparison with literature data for ceria-tungsten-based nanoperticles also points out higher catalytic performances for the the deveoped nanofibers at the lowest temperatures (< 300°C). This is mainly attributed to the unique nanofibrous morpholgy and to the doping approach. Stability of the amorphous Ce-W-TiOx nanofibers over time (120 h) and over a number of cycles (5) is demonstrated. Yet, superior catalytic performances of the developed catalysts in a wide range of temperatures (200-500 °C) over state-of-the-art material V-W-titania nanoparticles and nanofibers are also proven.

U2 - 10.1039/C8NJ00752G

DO - 10.1039/C8NJ00752G

M3 - Journal article

VL - 42

SP - 9501

EP - 9509

JO - New Journal of Chemistry

JF - New Journal of Chemistry

SN - 1144-0546

IS - 12

ER -