Analysis of N2O decomposition over fixed bed mixed metal oxide catalysts made from hydrotalcite-type precursors

Chang, Kil Sang; Song, Haak; Park, Yong-Sung; Woo, Je-Wan

doi:10.1016/j.apcata.2004.06.036

Cited by 43 publications

(17 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1c) for dry 5% N 2 O/He. The experimental data, expressed as N 2 O conversion (X N2O ) versus temperature (T) for the contact time t s = 0.39 s, were fitted with the kinetic model described elsewhere [25]:…”

Section: Resultsmentioning

confidence: 99%

Potassium Promotion of Cobalt Spinel Catalyst for N2O Decomposition—Accounted by Work Function Measurements and DFT Modelling

et al. 2008

View full text Add to dashboard Cite

The beneficial effect (decrease of the half conversion temperature by 100°C) of potassium doping, in the range of 0-5 atoms/nm 2 , on N 2 O decomposition over Co 3 O 4 was analyzed by work function measurements and DFT calculations. The optimal potassium surface loading was found to be 1.8 atoms/nm 2 . The effect was explained in terms of electronic promotion gauged by lowering of the catalyst work function by 0.48 eV (for K 2 CO 3 precursor) and 0.44 eV (for KOH). The promotional effect is discussed in relation to the theoretical and experimental surface dipoles determined from Hirshfeld atomic charges and geometry of the postulated potassium adspecies and from the Topping model, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Potassium Promotion of Cobalt Spinel Catalyst for N2O Decomposition—Accounted by Work Function Measurements and DFT Modelling

et al. 2008

View full text Add to dashboard Cite

show abstract

“…In a parallel experiment the concentration of NO during the whole temperature range remains essentially constant within the experimental error. The TPSR data, expressed as N 2 O conversion (X N 2 O ) versus temperature (T) were fitted with the kinetic model described elsewhere [18]:…”

Section: Catalytic Testsmentioning

confidence: 99%

Selective N2O Removal from the Process Gas of Nitric Acid Plants Over Ceramic 12CaO · 7Al2O3 Catalyst

et al. 2008

View full text Add to dashboard Cite

Catalytic high temperature decomposition (secondary abatement) of nitrous oxide over calcium aluminate 12CaO Á 7Al 2 O 3 (mayenite) was studied in the model laboratory tests (TPSR) and pilot units (steady-state) using the real feed. X-ray diffraction (XRD), scanning electron microscopy (SEM), N 2 -sorption (BET), electron paramagnetic resonance (EPR) and Raman spectroscopies were used to characterize the synthesized material. The catalyst exhibited high efficiency and selectivity in N 2 O removal, reaching practically 100% conversion at 1150 K without appreciable total losses of NO x . Owing to its high thermal stability and resistivity to sintering and low cost of production raw materials, mayenite was found to be a promising catalyst for economically appealing secondary abatement of nitrous oxide in nitric acid plants.

show abstract

“…For example, mixed oxides have been shown to be very active and selective in the decomposition of nitrogen oxides [16] or in the total oxidation of Volatile Organic Compounds [13,14]. Also, mixed oxides obtained after calcination were used equally as catalysts [13,17] or as catalytic support [18][19][20] in redox reactions such as the selective oxidation of hydrocarbons or the total oxidation of VOCs [21,22].…”

Section: Introductionmentioning

confidence: 99%

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

et al. 2015

View full text Add to dashboard Cite

Co6Al2HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H2-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co 2+ on the surface, the reducibility of the Co-Al mixed oxide and the T50 in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.

show abstract

Analysis of N2O decomposition over fixed bed mixed metal oxide catalysts made from hydrotalcite-type precursors

Cited by 43 publications

References 20 publications

Potassium Promotion of Cobalt Spinel Catalyst for N2O Decomposition—Accounted by Work Function Measurements and DFT Modelling

Potassium Promotion of Cobalt Spinel Catalyst for N2O Decomposition—Accounted by Work Function Measurements and DFT Modelling

Selective N2O Removal from the Process Gas of Nitric Acid Plants Over Ceramic 12CaO · 7Al2O3 Catalyst

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Contact Info

Product

Resources

About