Characterization and Reactivity of V2O5–MoO3/TiO2 De-NOx SCR Catalysts

Lietti, Luca; Nova, Isabella; Ramis, Gianguido; Dall’Acqua, L.; Busca, Guido; Giamello, Elio; Forzatti, Pio; Bregani, F.

doi:10.1006/jcat.1999.2603

Cited by 336 publications

(230 citation statements)

References 61 publications

Supporting

Mentioning

207

Contrasting

Unclassified

Order By: Relevance

“…For 15-MoO 3 /ZrO 2 sample, IR band at 997 cm −1 after evacuation at 773K is due to the Mo=O stretching mode of the molybdenum oxide complex bonded to the ZrO 2 surface. 37 As shown in Figure 4, this Mo=O band due to molybdenyl species only appears on evacuated sample, being shifted on wet sample. The broad band at 946 cm −1 under ambient condition [ Figure 4(b)] is assigned to the terminal Mo=O stretching of the hydrated form of the surface molybdenyl species.…”

Section: Methodsmentioning

confidence: 77%

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

2003

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Zirconia modified with MoO 3 was prepared by impregnation of powdered Zr(OH) 4 with ammonium heptamolybdate aqueous solution followed by calcining in air at high temperature. Spectroscopic studies on prepared catalysts were performed by using FTIR, Raman, XRD, and DSC and by measuring surface area. Upon the addition of molybdenum oxide to zirconia up to 15 wt%, the specific surface area increased in proportion to the molybdate oxide content, while acidity measured by irreversible chemisorption of ammonia exhibited a maximum value at 3 wt% of MoO 3 . Since the ZrO 2 stabilizes the molybdenum oxide species, for the samples equal to or less than 30 wt%, molybdenum oxide was well dispersed on the surface of zirconia and no phase of crystalline MoO 3 was observed at any calcination temperature above 400 o C. The catalytic activities for cumene dealkylation were roughly correlated with the acidity of catalysts measured by ammonia chemisorption method, while the catalytic activities for 2-propanol dehydration were not correlated with the acidity because weak acid sites are necessary for the reaction.

show abstract

Section: Methodsmentioning

confidence: 77%

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

2003

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

show abstract

“…54 This isolated tungsten oxide species is stabilized through multiple W-O-Ti bonds between each WO 3 species and the TiO 2 surface. 55,56 As listed in Table 1, the acidity of 20NiO/5Al 2 O 3 -TiO 2 /15WO 3 catalyst is the most among the catalysts.…”

Section: Resultsmentioning

confidence: 99%

Effect of Al₂O₃Addition and WO₃Modification on Catalytic Activity of NiO/Al₂O₃-TiO₂/WO₃for Ethylene Dimerization

Pae¹,

Sohn

2007

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Strong solid acid catalysts, NiO/Al 2 O 3 -TiO 2 /WO 3 for ethylene dimerization were prepared by the addition of Al 2 O 3 and the modification with WO 3 . The acid sites and acid strength were increased by the inductive effect of WO 3 species bonded to the surface of catalysts. The larger the dispersed WO 3 amount, the higher both the acidity and catalytic activity for ethylene dimerization. The addition of Al 2 O 3 to TiO 2 up to 5 mol% enhanced acidity and catalytic activity gradually due to the interaction between Al 2 O 3 and TiO 2 and consequent formation of Al-O-Ti bond.Key Words : Al 2 O 3 addition, WO 3 modification, Acidity, Ethylene dimerization IntrocuctionHeterogeneous catalysts for the dimerization and oligomerization of olefins, consisting mainly of nickel compounds supported on oxides, have been known for many years. A considerable number of papers have dealt with the problem of nickel-containing catalysts for ethylene dimerization.

show abstract

“…Also, V 2 O 5 /TiO 2 has superior endurance against SO 2 compared with other catalysts (Chen and Yang, 1992). For formulation of a practical V 2 O 5 /TiO 2 catalyst, WO 3 (Choo et al, 2003), MoO 3 (Lietti et al, 1999), SiO 2 (Sorrentino et al, 2001), or other chemicals is added or sulfated according to the processing condition. The catalyst promoter, greater than V 2 O 5 in quantity, is selected and added according to the emission condition and plays an important role in boosting the performance of the V 2 O 5 /TiO 2 catalyst.…”

Section: Introductionmentioning

confidence: 99%

Hybrid selective noncatalytic reduction (SNCR)/selective catalytic reduction (SCR) for NO_x removal using low-temperature SCR with Mn-V₂O₅/TiO₂ catalyst

Choi

Bae

2015

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Characterization and Reactivity of V2O5–MoO3/TiO2 De-NOx SCR Catalysts

Cited by 336 publications

References 61 publications

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

Effect of Al₂O₃Addition and WO₃Modification on Catalytic Activity of NiO/Al₂O₃-TiO₂/WO₃for Ethylene Dimerization

Hybrid selective noncatalytic reduction (SNCR)/selective catalytic reduction (SCR) for NO_x removal using low-temperature SCR with Mn-V₂O₅/TiO₂ catalyst

Contact Info

Product

Resources

About

Characterization and Reactivity of V2O5–MoO3/TiO2 De-NOx SCR Catalysts

Cited by 336 publications

References 61 publications

Spectroscopic Studies on ZrO2Modified with MoO3and Activity for Acid Catalysis

Spectroscopic Studies on ZrO2Modified with MoO3and Activity for Acid Catalysis

Effect of Al2O3Addition and WO3Modification on Catalytic Activity of NiO/Al2O3-TiO2/WO3for Ethylene Dimerization

Hybrid selective noncatalytic reduction (SNCR)/selective catalytic reduction (SCR) for NOx removal using low-temperature SCR with Mn-V2O5/TiO2 catalyst

Contact Info

Product

Resources

About

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

Spectroscopic Studies on ZrO₂Modified with MoO₃and Activity for Acid Catalysis

Effect of Al₂O₃Addition and WO₃Modification on Catalytic Activity of NiO/Al₂O₃-TiO₂/WO₃for Ethylene Dimerization

Hybrid selective noncatalytic reduction (SNCR)/selective catalytic reduction (SCR) for NO_x removal using low-temperature SCR with Mn-V₂O₅/TiO₂ catalyst