Synthetic Studies of ABB′O<sub>3</sub> (A: La, Pr, Nd; B: Fe, Mn; B′: Pd, Pt) Perovskites.

Koponen, Markus J.; Suvanto, Mika; Pakkanen, Tapani A.; Kallinen, Kauko; Kinnunen, Toni-J.J.; Haerkoenen, Matti

doi:10.1002/chin.200514221

Cited by 3 publications

(10 citation statements)

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“…SEM images of 2% Pd/AMn 0.4 Fe 0.6 O 3 (A = Ba, La, Pr) are presented in figure 1. As can be seen, the particles of La and Pr perovkites are spherical, as in our previous study [19], while those of barium perovskites particles are flake-like. The different shape and size of the barium perovskite particles might be due to the modification of the preparation method: higher pH and longer mixture time of solution and higher calcination temperature (causing agglomeration) were needed to obtain the cubic structure of barium perovskites.…”

Section: Characterization Of Catalystsmentioning

confidence: 66%

“…Comparison of surface areas of the perovkites shows that surface areas were notably smaller for the barium perovskites than the corresponding lanthanum and praseodymium perovskites. The smaller surface areas were due to the agglomeration of particles caused by the 200°C higher calcination temperature for the barium perovskites [20]. Surface areas were higher for of perovskites with manganese in B-site.…”

Section: Characterization Of Catalystsmentioning

confidence: 98%

“…The reactor system was illustrated in our previous study [19]. In methane conversion studies, 1.04% CH 4 /16.00% O 2 / 82.96% N 2 mixture gas (from Air Liquide) was used and SO 2 treatment was made with 25 ppm SO 2 /N 2 mixture (AGA).…”

Section: Methane Conversion Measurementsmentioning

confidence: 99%

“…Perovskites were prepared via malic acid complexation, as in our previous studies [19,20]. Stoichiometric amounts of reactants, which were commercially available nitrates, were dissolved in water.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In previous work, we investigated the effects on methane conversion of adding palladium on lanthanum perovskite and adjusting the B-site metal combinations [19]. Highest activity was achieved with low loading of Pd (2% or 2.5%) and with the B-site combination Mn 0.4 Fe 0.6 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

et al. 2006

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Barium, lanthanum, and praseodymium perovskites were prepared by malic acid complexation. Surface areas of the La and Pr perovskites were between 17.1 and 21.6 m 2 g )1 . The moderate low surface areas (5.7 m 2 g )1 ) observed for corresponding barium perovskites were due to the high calcination temperatures. The calcination temperature also affected the shapes and sizes of the perovskite particles. According to SEM images the nanoparticles of the La and Pr perovskites were spherical, whereas those of barium perovskites were flakes. The conversion of methane increased in the order of A-site metal Ba < Pr < La. The CH 4 conversion after SO 2 treatment correlated with size of the perovskite particles: the smaller the particles the better the activity. The highest methane conversion after SO 2 treatment was achieved with lanthanum perovskite with B-site metal combination Mn 0.4 Fe 0.6 .

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Section: Characterization Of Catalystsmentioning

confidence: 66%

Section: Characterization Of Catalystsmentioning

confidence: 98%

Section: Methane Conversion Measurementsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

et al. 2006

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Aging of Premixed Metal Fiber Burners for Natural Gas Combustion Catalyzed with Pd/LaMnO₃·2ZrO₂

Specchia

Irribarra

Palmisano

et al. 2007

Ind. Eng. Chem. Res.

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The aim of this work is the study of the aging effect induced by S-compounds added as odorants in the natural gas network over a previously developed catalysts now deposited on a FeCrAl alloy fiber mat (NIT 200/S by ACOTECH BV). A novel generation of catalytic premixed fiber burners for low-environmentalimpact natural gas combustion are based on Pd/LaMnO 3 ‚2ZrO 2 catalyst, where ZrO 2 acts as a structural promoter and the noble metal/perovskite synergism is effectively exploited, leading to enhanced performances with respect to noncatalyzed burners. The catalytic premixed fiber burners were characterized by means of field emission scanning electron microscope/energy dispersive spectrometer (FESEM/EDS), temperature programmed desorption/reduction/oxidation (TPD/R/O), and thermogravimetric/mass spectroscopy (TG/MS) techniques. The combustion runs were accomplished in a domestic boiler pilot plant under realistic operating conditions. An unexpected improvement was found in the overall performance of catalyzed burners after sulfur aging carried out up to 3 weeks (the catalyzed burners were kept in an electric oven at 800 °C under a N 2 flow containing 200 ppmv of SO 2 ). Despite the effect of catalyst thermal stress and aging, the overall performance, in terms of pollutant emissions, was preserved after accelerated lifetime utilization. This is probably due to the presence of microfractures on the aged burners, accomplished by an increase of active sites for β-type oxygen desorption, able to improve methane combustion.

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Low-temperature Oxidation of Odor Compounds over La-based Perovskite Catalyst

Bang¹,

Seo²,

Lee³

et al. 2011

Korean Chemical Engineering Research

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− Various La-based perovskite catalysts were prepared by a Pechini method, and they were applied to the low-temperature oxidation of odor compounds exhausted from waste food treatment process for effective deodorization. Quantitative and qualitative analyses of exhausted gas were conducted to measure the amount of major odor compounds with respect to operation time. A standard odor sample composed of major odor compounds was then prepared for use as a feed for oxidation reaction system. Various transition metal(M)-substituted La-based perovskite catalysts (LaMO 3 : M=Cr, Mn, Fe, Co, and Ni) were prepared and applied to the oxidation of odor compounds in order to investigate the effect of transition metal M. Among the catalysts tested, LaNiO 3 catalyst showed the best catalytic performance. Pt-substituted perovskite catalysts (LaNi 1-x Pt x O 3 : x=0, 0.03, 0.1, and 0.3) were then prepared for enhancing the catalytic performance. It was found that LaNi 0.9 Pt 0.1 O 3 catalyst served as the most efficient catalyst. Supported perovskite catalysts (XLaNi 0.9 Pt 0.1 O 3 /Al 2 O 3 : X=perovskite content(wt%), 0,10, 20, 30, 40, 50, and 100) were finally applied for the purpose of maximizing the catalytic performance of perovskite catalyst in the low-temperature oxidation reaction. Catalytic performance of XLaNi 0.9 Pt 0.1 O 3 /Al 2 O 3 catalysts showed a volcano-shaped curve with respect to perovskite content. Among the catalysts tested, 20LaNi 0.9 Pt 0.1 O 3 /Al 2 O 3 catalyst exhibited the highest conversion of odor compounds of 88.7% at 180 o C.

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Synthetic Studies of ABB′O₃ (A: La, Pr, Nd; B: Fe, Mn; B′: Pd, Pt) Perovskites.

Cited by 3 publications

References 1 publication

Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

Aging of Premixed Metal Fiber Burners for Natural Gas Combustion Catalyzed with Pd/LaMnO₃·2ZrO₂

Low-temperature Oxidation of Odor Compounds over La-based Perovskite Catalyst

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Synthetic Studies of ABB′O3 (A: La, Pr, Nd; B: Fe, Mn; B′: Pd, Pt) Perovskites.

Cited by 3 publications

References 1 publication

Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

Aging of Premixed Metal Fiber Burners for Natural Gas Combustion Catalyzed with Pd/LaMnO3·2ZrO2

Low-temperature Oxidation of Odor Compounds over La-based Perovskite Catalyst

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Synthetic Studies of ABB′O₃ (A: La, Pr, Nd; B: Fe, Mn; B′: Pd, Pt) Perovskites.

Aging of Premixed Metal Fiber Burners for Natural Gas Combustion Catalyzed with Pd/LaMnO₃·2ZrO₂