Methane and propane combustion over lanthanum transition-metal perovskites: role of oxygen mobility

Alifanti, M.; Kirchnerová, J.; Delmon, Bernard; Klvana, D.

doi:10.1016/j.apcata.2003.11.024

Cited by 120 publications

(60 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The preparation of high-surface-area perovskites is a promising route to obtain highly active catalysts. [14,32] 2.5. Activity and Selectivity during a Reduction Cycle ODH using solid oxygen carriers involves reaction with lattice oxygen.…”

Section: Perovskites Versus Doped Ceriasmentioning

confidence: 99%

“…They can have extremely high melting points (Ba 3 MgTa 2 O 9 ), be ionic conductors (La x Sr 1Àx Ga y Mg 1Ày O 3 ), or be piezoelectric (PbZr 1 Ti 1Àx O 3 ). [8][9][10][11] Perovskites are used as catalysts in many applications, including oxidation and hydrogenation reactions, [7,[12][13][14] solid oxygen fuel cells [7,15,16] and pollution abatement. [7,14,17] One elegant application is using perovskites as diesel exhaust soot filters.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11] Perovskites are used as catalysts in many applications, including oxidation and hydrogenation reactions, [7,[12][13][14] solid oxygen fuel cells [7,15,16] and pollution abatement. [7,14,17] One elegant application is using perovskites as diesel exhaust soot filters. [18,19] By coating a low-loss ceramic monolith with a microwave-susceptible perovskite catalyst, fast and efficient heating is achieved, since all the energy is supplied where it is needed, that is, on the combustion catalyst itself.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs

et al. 2008

View full text Add to dashboard Cite

Perovskite-type oxides, ABO(3), can be successfully applied as solid "oxygen reservoirs" in redox reactions such as selective hydrogen combustion. This reaction is part of a novel process for propane oxidative dehydrogenation, wherein the lattice oxygen of the perovskite is used to combust hydrogen selectively from the dehydrogenation mixture at 550 degrees C. This gives three key advantages: it shifts the dehydrogenation equilibrium to the side of the desired products, heat is generated, thus aiding the endothermic dehydrogenation, and it simplifies product separation (H(2)O vs H(2)). Furthermore, the process is safer since it uses the catalysts' lattice oxygen instead of gaseous O(2). We screened fourteen perovskites for activity, selectivity and stability in selective hydrogen combustion. The catalytic properties depend strongly on the composition. Changing the B atom in a series of LaBO(3) perovskites shows that Mn and Co give a higher selectivity than Fe and Cr. Replacing some of the La atoms with Sr or Ca also affects the catalytic properties. Doping with Sr increases the selectivity of the LaFeO(3) perovskite, but yields a catalyst with low selectivity in the case of LaCrO(3). Conversely, doping LaCrO(3) with Ca increases the selectivity. The best results are achieved with Sr-doped LaMnO(3), with selectivities of up to 93 % and activities of around 150 mumol O m(-2). This catalyst, La(0.9)Sr(0.1)MnO(3), shows excellent stability, even after 125 redox cycles at 550 degrees C (70 h on stream). Notably, the activity per unit surface area of the perovskite catalysts is higher than that of doped cerias, the current benchmark of solid oxygen reservoirs.

show abstract

Section: Perovskites Versus Doped Ceriasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Lattice oxygen and/or surface-bound oxygen species are more likely to be incorporated in the active site. [12] The copper catalyst 15 is a special case. Only a small number of Cu 3 + compounds are known, and when preparing lanthanum copper perovskite, very high pressures of 200 kbar need to be obtained to achieve a high Cu 3 + content.…”

Section: Co Oxidation Activitymentioning

confidence: 99%

Clean Diesel Power via Microwave Susceptible Oxidation Catalysts

2006

View full text Add to dashboard Cite

The problem of soot emissions from diesel engines is introduced and the possible solution of combining doped perovskites and microwave (mw) irradiation to "clean up" diesel soot filters is outlined. Eighteen doped perovskite catalysts are synthesized and tested for propane and CO oxidation, which are taken as model components for soot. The activity, selectivity, and SO2 tolerance are compared under conventional heating and mw irradiation. By combining mw irradiation and doped perovskites, one can create "hot spots" on the catalyst, resulting in efficient and selective heating of the active site, as well as less poisoning. Sr-doped and Ce-doped manganese perovskites show the highest activity. These catalysts are also the most selective, and have a high mw susceptibility. Optimal SO2 tolerance is displayed by Cr perovskites, from which the La0.8Ca0.2CrO3 combination uniquely converts propane before CO, and therefore can be used to remove >C2 hydrocarbons from a mix with CO. Possible mechanistic scenarios are presented and discussed.

show abstract

“…, SnO 2 , CeO 2 ) (Sekizawa, 2000;Thevenin, 2003), as well as thermal/chemical stability (e.g., NiO, Rare earth oxides) (Widjaja, 1999;Colussi, 2004). Often times mixtures of metal oxide catalyst supports are used to produce synergistic effects that enhance both activity and stability of the catalyst (Widjaja, (Marchetti & Forni, 1998;Arai, 1986;McCarty & Wise, 1990;Ferri & Forni, 2001;Ciambelli, 2001;Alifanti, 2004 (Arai, 1986). Many of the recent studies in combustion catalysts have focused on hexaaluminate-based catalysts (e.g.…”

Section: Catalyst and Support Developmentmentioning

confidence: 99%

Catalyzed Ceramic Burner Material

Barnes¹

2012

View full text Add to dashboard Cite

Methane and propane combustion over lanthanum transition-metal perovskites: role of oxygen mobility

Cited by 120 publications

References 36 publications

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs

Clean Diesel Power via Microwave Susceptible Oxidation Catalysts

Catalyzed Ceramic Burner Material

Contact Info

Product

Resources

About

Methane and propane combustion over lanthanum transition-metal perovskites: role of oxygen mobility

Cited by 120 publications

References 36 publications

Selective Hydrogen Oxidation in the Presence of C3 Hydrocarbons Using Perovskite Oxygen Reservoirs

Selective Hydrogen Oxidation in the Presence of C3 Hydrocarbons Using Perovskite Oxygen Reservoirs

Clean Diesel Power via Microwave Susceptible Oxidation Catalysts

Catalyzed Ceramic Burner Material

Contact Info

Product

Resources

About

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs

Selective Hydrogen Oxidation in the Presence of C₃ Hydrocarbons Using Perovskite Oxygen Reservoirs