ChemInform Abstract: MECHANISM OF THE REACTION OF NITRIC OXIDE AND AMMONIA ON VANADIUM OXIDE CATALYST IN THE PRESENCE OF OXYGEN UNDER THE DILUTE GAS CONDITION

Inomata, Makoto; Miyamoto, Akira; Murakami, Yûichi

doi:10.1002/chin.198024030

Cited by 30 publications

(48 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…=O sites to form -NH 2 species and V-OH [20], the former reacts with the gaseous NO to form N 2 [20] while the latter is oxidized by O 2 to V 5 ? =O to restore the catalyst's activity [20,25]. However, the observation in Fig.…”

Section: The Role Of O 2 In the Scrcontrasting

confidence: 39%

An In Situ DRIFTS Study on SCR of NO with NH3 Over V2O5/AC Surface

Sun

Liu

et al. 2009

Catal Lett

View full text Add to dashboard Cite

Selective catalytic reduction (SCR) of NO with NH 3 on an activated coke supported V 2 O 5 (V 2 O 5 /AC) catalyst was studied at 200°C by in-situ diffuse reflectance infrared Fourier transform spectroscopy. Results indicate that NH 3 is adsorbed in the forms of coordinated NH 3 , NH 4 ? and -NH 2 . V 2 O 5 promotes formation of -NH 2 . NO is oxidized to NO 2 in the presence of O 2 . -NH 2 and NO 2 are the intermediates of the SCR reaction.

show abstract

Section: The Role Of O 2 In the Scrcontrasting

confidence: 39%

An In Situ DRIFTS Study on SCR of NO with NH3 Over V2O5/AC Surface

Sun

Liu

et al. 2009

Catal Lett

View full text Add to dashboard Cite

show abstract

“…1, Table 1) exhibits first order for component NO, zero order for component NH3 according to the literature [12][13], and in excess oxygen the reaction rate does not depend on the oxygen conc~mtration. At temperatures higher than the optimum one (T > Topt), the denoxation efficiency significantly decreases due to the occurrence of side reactions 2 and 3 in Table 1.…”

Section: Resultsmentioning

confidence: 96%

Investigations on the selectivity of catalytic no reduction by ammonia

Egyházy

Tac

Kovács

et al. 1999

React Kinet Catal Lett

View full text Add to dashboard Cite

The activity and selectivity of V20~/y-AI203 catalyst were studied in the catalytic reduction of nitrogen oxide by ammonia. The activity of the catalyst monotonically increases as a function of temperature, however, its selectivity decreases. The DeNOx reaction of nitrogen oxides with ammonia can be described well by a mathematical model, which considers selectivity-decreasing side reactions as well in a wide temperature range (220-4200C).

show abstract

“…and gas phase NO, whereas the Langmuir-Hinshelwood mechanism involves reaction between adsorbed NO on TiO 2 and adsorbed NH 3 on V 5? [15,16]. The Eley-Rideal mechanism proposed by Topsøe et al [17] is widely accepted (Fig.…”

Section: Activity Screening and Analysismentioning

confidence: 97%

“…Many different types of reaction mechanisms have been proposed in the literature for SCR reaction including the Eley-Rideal mechanism and the Langmuir-Hinshelwood mechanism [15,16]. The Eley-Rideal mechanism involves reaction between adsorbed NH 4 ?…”

Section: Activity Screening and Analysismentioning

confidence: 99%

“…It can be seen that the BET surface area and pore volume consistently decrease with increasing V 2 O 5 coverage. To eliminate the dilution effect and evaluate the actual change of the surface area and pore volume due to incorporation of vanadium oxide, the surface area and pore volume were normalized relative to the weight of the support (Table 9) [15]. It can be seen that normalized pore volume (NPV) decreased linearly with increasing V 2 O 5 loading.…”

Section: N 2 Adsorption Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Active Sites Evaluation of Vanadia Based Powdered and Extruded SCR Catalysts Prepared on Commercial Titania

Murkute

VanderWiel

2015

Catal Lett

View full text Add to dashboard Cite

The active sites of powder and monolith V 2 O 5 -WO 3 /TiO 2 catalysts prepared on commercial titania supports were studied for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) by ammonia (NH 3 ) while varying vanadium oxide (V 2 O 5 ) coverage. Four different types of commercial titania (DT-51, DT-56, G-5, and S-10) were used in this study. It was observed that the SCR activity of powder V 2 O 5 -WO 3 /TiO 2 is highly dependent on the vanadium coverage. The catalytic activity increased with increasing V 2 O 5 coverage and reached a maximum between one-half and one monolayer of vanadia. However, NO x conversion decreased at high V 2 O 5 coverage. The catalysts were characterized by temperature-programmed desorption of NH 3 (NH 3 TPD), temperature-programmed reduction by hydrogen (H 2 TPR), oxygen chemisorption, and N 2 adsorption to evaluate the active sites responsible for high SCR activity. The spectroscopic studies revealed that the rapid decrease in SCR activity at higher vanadia coverage is due to the decrease in the reducibility and dispersion of vanadium species. This synthetic learning was extended to investigate the active sites in extruded monolith V 2 O 5 -WO 3 /TiO 2 catalysts. A good correlation between redox sites and activity for powder and monolith V 2 O 5 -WO 3 /TiO 2 catalysts was found. Graphical Abstract 0.57 1.14

show abstract

ChemInform Abstract: MECHANISM OF THE REACTION OF NITRIC OXIDE AND AMMONIA ON VANADIUM OXIDE CATALYST IN THE PRESENCE OF OXYGEN UNDER THE DILUTE GAS CONDITION

Abstract: Die Reaktion zwischen NO und NH3 an V2O5 in verdünnter Gasatmosphäre wird durch O2 kräftig beschleunigt, wofür die Katalysatorspezies V5 =Overantwortlich ist.

Cited by 30 publications

References 1 publication

An In Situ DRIFTS Study on SCR of NO with NH3 Over V2O5/AC Surface

An In Situ DRIFTS Study on SCR of NO with NH3 Over V2O5/AC Surface

Investigations on the selectivity of catalytic no reduction by ammonia

Active Sites Evaluation of Vanadia Based Powdered and Extruded SCR Catalysts Prepared on Commercial Titania

Contact Info

Product

Resources

About