“Hot Spot” Hydrocarbon Oxidation Catalysed by Doped Perovskites—Towards Cleaner Diesel Power

Beckers, Jurriaan; Rothenberg, Gadi

doi:10.1002/cphc.200400421

Cited by 27 publications

(25 citation statements)

References 21 publications

(17 reference statements)

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“…Pressure induced changes in distortions in perovskites can be related to octahedral tilt angles at room pressure which decrease linearly with increase in R-ion radii. [26] When the distortion is high at ambient pressure (as in small R-ion case), R-ion is less confined in RO 12 and with pressure RO 12 compresses significantly leading to a more distorted structure. Conversely, when the distortion is low at room pressure (as in larger Rion), R-ion will be strongly confined inside RO 12 and at higher pressure RO 12 will be less compressible leading to a less distorted structure.…”

Section: Discussionmentioning

confidence: 99%

“…[26] When the distortion is high at ambient pressure (as in small R-ion case), R-ion is less confined in RO 12 and with pressure RO 12 compresses significantly leading to a more distorted structure. Conversely, when the distortion is low at room pressure (as in larger Rion), R-ion will be strongly confined inside RO 12 and at higher pressure RO 12 will be less compressible leading to a less distorted structure. These effects were clearly demonstrated by the pressure dependence of A g (1) and A g (7) modes.…”

Section: Discussionmentioning

confidence: 99%

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Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Bhadram

Swain

Dhanya

et al. 2014

Mater. Res. Express

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Abstract:The effect of rare-earth ion size on the octahedral distortions in rare-earth chromites (RCrO 3 , R = Lu, Tb, Gd, Eu, Sm) crystallizing in the orthorhombic structure has been studied using Raman scattering and synchrotron powder x-ray diffraction up to 20 GPa. From our studies on RCrO 3 we found that the octahedral tilts (distortions) increase with pressure. This is contrary to the earlier report which suggests that in LaCrO 3 , the distortions decrease with pressure leading to a more ordered phase at high pressure. Here we observe that the rate of increase in distortion decreases with the increase in R-ion radii. This occurs due to the reduction in the compression of RO 12 polyhedra with a corresponding increase in the compression of the CrO 6 octahedra with increasing R-ion radii. From the Raman studies, we predict a critical R-ion radii, above which we expect the distortions in RCrO 3 to reduce with increasing pressure leading to what is observed in the case of LaCrO 3 . These Raman results are consistent with our pressure dependent structural studies on RCrO 3 (R = Gd, Eu, Sm). Also, our results suggest that the pressure dependence of Néel temperature, T N Cr , (where the Cr 3+ spin orders) in RCrO 3 is mostly affected by the compressions of Cr-O bonds rather than the alteration of octahedral tilts.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Bhadram

Swain

Dhanya

et al. 2014

Mater. Res. Express

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“…There has been some debate about whether this effect is simply a thermal one, due to the higher temperatures attained at hot-spots, or whether they are caused by nonthermal interactions between the substrate and the microwave radiation [53,[101][102][103][104].…”

Section: The Effects Of Microwave Dielectric Heating On Heterogeneousmentioning

confidence: 99%

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Zhang

Hayward

2006

Inorganica Chimica Acta

171

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The application of microwave dielectric heating in a range of environment-related heterogeneous catalytic reaction systems has been reviewed. The reactions investigated include the decomposition of hydrogen sulfide, the reduction of sulfur dioxide with methane, the reformation of methane by carbon dioxide, the hydrodesulfurization of thiophene, and the oxidative coupling of methane. The interaction of microwave irradiation with heterogeneous catalytic systems and its consequence for the microwave heating behaviour of catalysts have been examined. The effect/mechanism of microwave dielectric heating on heterogeneous catalytic reaction systems has also been discussed.

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“…But there are only few reports concerning propane total oxidation under microwave radiation using mixed oxides as catalysts. Beckers et al [8,29] revealed that most of studied doped perovskites give higher propane conversion rates and suggests the hypothesis that MW heating creates ''hot spots'' on the catalysts active sites depending on the nature of occupied B site atom in the perovskite structure and its number of unpaired d-electrons. The most active La 0.9 Sr 0.1 MnO 3 enables full propane conversion at 350°C i.e.…”

Section: Catalytic Propertiesmentioning

confidence: 99%

Total oxidation of lean propane over α-Fe2O3 using microwaves as an energy source

Dobosz

Zawadzki

2014

Reac Kinet Mech Cat

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A combined process of catalytic oxidation and microwave heating for the treatment of lean propane-air mixture, and ''green'' hematite synthesis were described in this work. The study demonstrated that removal and oxidation efficiencies of propane over a-Fe 2 O 3 were above 99.9 % after a short microwave radiation time (from 9 min) and they were strongly dependent on the applied microwave power. Comparing to conventional heating, the catalytic performance of hematite was enhanced by lowering the operation temperature under microwave conditions. Nanocrystalline a-Fe 2 O 3 catalyst with mesoporous structure was successfully prepared by a microwave-assisted hydrothermal treatment of iron hydroxide in an aqueous solution without any alkali additive, and characterized by XRD, TEM, TPR-H 2 , FTIR and N 2 adsorption-desorption. The microwave-induced heating over hematite catalyst appears to be a very effective alternative method for air treatment to the destruction and removal of short chain hydrocarbons.

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“Hot Spot” Hydrocarbon Oxidation Catalysed by Doped Perovskites—Towards Cleaner Diesel Power

Cited by 27 publications

References 21 publications

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Total oxidation of lean propane over α-Fe2O3 using microwaves as an energy source

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“Hot Spot” Hydrocarbon Oxidation Catalysed by Doped Perovskites—Towards Cleaner Diesel Power

Cited by 27 publications

References 21 publications

Effect of pressure on octahedral distortions inRCrO3(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Effect of pressure on octahedral distortions inRCrO3(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Total oxidation of lean propane over α-Fe2O3 using microwaves as an energy source

Contact Info

Product

Resources

About

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications