Preparation, characterization and NH3–SCR activity of FeVO4 supported on TiO2–WO3–SiO2

Casanova, Marzia; Nodari, Luca; Sagar, Amod; Schermanz, Karl; Trovarelli, Alessandro

doi:10.1016/j.apcatb.2015.04.056

Cited by 49 publications

(28 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The drawback of the introduction of iron in the vanadate formulation is the reduced thermal stability promoted by enhancement of TiO 2 phase transformation from anatase to rutile. In addition, in our previous work [20] and confirmed also in the work by Marberger et al [21], it was shown that after loading FeVO 4 on TWS, a mixture containing both the vanadate and Fe 2 O 3 was formed. The formation of hematite was accompanied by the simultaneous generation of VO x species identified by Raman spectroscopy [20].…”

Section: Introductionsupporting

confidence: 59%

“…In addition, in our previous work [20] and confirmed also in the work by Marberger et al [21], it was shown that after loading FeVO 4 on TWS, a mixture containing both the vanadate and Fe 2 O 3 was formed. The formation of hematite was accompanied by the simultaneous generation of VO x species identified by Raman spectroscopy [20]. We investigate in this work the specific role of the presence of Fe 2 O 3 on the FeVO 4 /TWS thermal stability and catalytic activity.…”

Section: Introductionsupporting

confidence: 59%

“…surface area measurements, Mössbauer spectroscopy and temperature programmed methods are reported in [20]. in the lower temperature range is relatively independent on the pH of preparation with a slight lower activity in the high temperature range of sample FeVO 4 (pH9)/TWS (characterized by the highest Fe/V ratio).…”

Section: Introductionmentioning

confidence: 98%

“…The variation of the Fe 2 O 3 content in the catalytic system was achieved by following two main routes: (a) by direct addition of Fe 2 O 3 to the vanadate during the synthesis and (b) indirectly, by varying the pH during the preparation of FeVO 4 . The compositional purity of FeVO 4 is in fact reported to be highly sensitive to the conditions of preparation and affected by the pH of the reaction medium giving rise to Fe or V rich formulations which modifies the characteristics of the resulting catalyst in terms of activity and stability [20,22] The supported catalysts were prepared by mixing two aqueous slurries containing, respectively, FeVO 4 or FeVO 4 /Fe 2 O 3 mixture and the commercial support of composition 81 %TiO 2 -9 %WO 3 -10 %SiO 2 (DT-58 from Cristal Global, indicated throughout the paper as TWS). The weight ratio of metal vanadate/TWS was 8.4/91.6.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Stability of Fe2O3-Doped FeVO4/TiO2–WO3–SiO2 SCR Catalysts

et al. 2016

Self Cite

View full text Add to dashboard Cite

This work investigates the effect of addition of Fe2O3 in FeVO4 supported on TiO2-WO3-SiO2 (TWS) NH3-SCR catalysts. The catalysts were prepared by loading 8.4 wt% FeVO4 and different amounts of Fe2O3 on TWS support and the effect of ageing in the range of temperature 650-750 degrees C on the SCR reaction was studied. Fe2O3 does not give any significant contribution to SCR activity for the samples treated at lower temperature, but a remarkable difference is achieved for the samples aged at 750 degrees C. The presence of Fe2O3 at an appropriate loading significantly enhances the thermal stability of the system by contrasting the formation of rutile and lowering the formation of surface VOx species

show abstract

Section: Introductionsupporting

confidence: 59%

Section: Introductionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Stability of Fe2O3-Doped FeVO4/TiO2–WO3–SiO2 SCR Catalysts

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the diffraction profile of 8.4 wt % FeVO 4 /TWS only diffraction lines due to anatase-TiO 2 and Fe 2 O 3 were observed. This is due to partial decomposition of FeVO 4 on TiO 2 -based supports following thermal treatments [14,18]. This decomposition generates Fe 2 O 3 plus VO x species which at low coverage are not detected by XRD, while the remaining FeVO 4 could not be clearly identified because of superposition of its main diffraction line to the anatase main diffraction peak.…”

Section: Catalysts Characterizationmentioning

confidence: 96%

Investigation of Iron Vanadates for Simultaneous Carbon Soot Abatement and NH3-SCR

2018

Self Cite

View full text Add to dashboard Cite

FeVO 4 and Fe 0.5 Er 0.5 VO 4 were prepared and loaded over standard Selective Catalytic Reduction (SCR) supports based on TiO 2 -WO 3 -SiO 2 (TWS) and redox active supports like CeO 2 and CeZrO 2 with the aim of finding a suitable formulation for simultaneous soot abatement and NH 3 -SCR and to understand the level of interaction between the two reactions. A suitable bi-functional material was identified in the composition FeVO 4 /CeZrO 2 where an SCR active component is added over a redox active support, to increase carbon oxidation properties. The influence of the presence of ammonia in soot oxidation and the effect of the presence of soot on SCR reaction have been addressed. It is found that the addition of NO and NO/NH 3 mixtures decreases at different levels the oxidation temperature of carbon soot, while the presence of carbon adversely affects the NH 3 -SCR reaction by increasing the oxidation of NH 3 to NO, thus lowering the NO removal efficiency.

show abstract

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Granger

Siaka

Umbarkar

2018

The Chemical Record

View full text Add to dashboard Cite

This paper reports a short review on the impact of poisoning effects and thermal aging on the reactivity of surface vanadate species on benchmark V2O5−WO3/TiO2 Selective‐Catalytic‐Reduction catalysts. A renewed interest of this SCR technology is related to its diversification notably as after‐treatment systems to treat the exhaust from Diesel engines with higher running temperature especially when SCR catalysts are coated on Diesel Particulates Filters. Particular attention is also paid to poisoning effects in conjunction with the progressive replacement of fossil fuels by bio‐fuels containing alkaline contaminants which drastically deactivate the catalyst through neutralization of strong acid sites. Most of the investigations show that better insight into the mechanisms of poisoning and aging processes is needed especially to understand the relative sensibility of various vanadate species. This could provide original guidelines to catalyst preparation and or the developments of more stable bulk systems as exemplified.

show abstract

Preparation, characterization and NH3–SCR activity of FeVO4 supported on TiO2–WO3–SiO2

Cited by 49 publications

References 38 publications

Enhanced Stability of Fe2O3-Doped FeVO4/TiO2–WO3–SiO2 SCR Catalysts

Enhanced Stability of Fe2O3-Doped FeVO4/TiO2–WO3–SiO2 SCR Catalysts

Investigation of Iron Vanadates for Simultaneous Carbon Soot Abatement and NH3-SCR

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Contact Info

Product

Resources

About