Stoichiometric and non-stoichiometric perovskite-based catalysts: Consequences on surface properties and on catalytic performances in the decomposition of N2O from nitric acid plants

Wu, Yeke; Ni, Xianzhi; Beaurain, A.; Dujardin, Christophe; Granger, Pascal

doi:10.1016/j.apcatb.2012.05.033

Cited by 65 publications

(46 citation statements)

References 34 publications

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“…Intrinsic rate c ( In addition, preliminary experiments and calculations confirmed the absence of external and internal diffusion limitations in this conversion and temperature range which emphasizes the fact that these measurements were performed in chemical regime as earlier checked on the same variety of catalysts [22].…”

Section: Catalytic Performances In the Decomposition Of N 2 Osupporting

confidence: 51%

Surface reconstructions of LaCo1−xFexO3 at high temperature during N2O decomposition in realistic exhaust gas composition: Impact on the catalytic properties

Cordier

Berrier

et al. 2013

Applied Catalysis B: Environmental

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Section: Catalytic Performances In the Decomposition Of N 2 Osupporting

confidence: 51%

Surface reconstructions of LaCo1−xFexO3 at high temperature during N2O decomposition in realistic exhaust gas composition: Impact on the catalytic properties

Cordier

Berrier

et al. 2013

Applied Catalysis B: Environmental

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“…La accumulation on the surface most probably occurs due to formation of La 2 (CO 3 ) 3 , La(OH) 3 with the perovskite. As illustrated in a recent study [32], it is possible to control the Co/La surface atomic ratio, by modifying the synthesis parameters. However, the currently used synthesis parameters were chosen in order to mimic the synthetic conditions reported in a recent study by GM [16] which demonstrated highly active perovskite catalysts.…”

Section: Resultsmentioning

confidence: 99%

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

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Doğaç

Vovk

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tPerovskite-based materials (LaMnO 3 , Pd/LaMnO 3 , LaCoO 3 and Pd/LaCoO 3 ) were synthesized, characterized (via BET, XRD, Raman spectroscopy, XPS and TEM) and their NO x (x = 1,2) adsorption characteristics were investigated (via in-situ FTIR and TPD) as a function of the nature of the B-site cation (i.e. Mn vs Co), Pd/PdO incorporation and H 2 -pretreatment. NO x adsorption on of LaMnO 3 was found to be significantly higher than LaCoO 3 , in line with the higher SSA of LaMnO 3 . Incorporation of PdO nanoparticles with an average diameter of ca. 4 nm did not have a significant effect on the amount of NO 2 adsorbed on fresh LaMnO 3 and LaCoO 3 . TPD experiments suggested that saturation of fresh LaMnO 3 , Pd/LaMnO 3 , LaCoO 3 and Pd/LaCoO 3 with NO 2 at 323 K resulted in the desorption of NO 2 , NO, N 2 O and N 2 (without O 2 ) below 700 K, while above 700 K, NO x desorption was predominantly in the form of NO + O 2 . Perovskite materials were found to be capable of activating N-O linkages typically at ca. 550 K (even in the absence of an external reducing agent) forming N 2 and N 2 O as direct NO x decomposition products. H 2 -pretreatment yielded a drastic boost in the NO oxidation and NO x adsorption of all samples, particularly for the Cobased systems. Presence of Pd further boosted the NO x uptake upon H 2 -pretreatment. Increase in the NO x adsorption of H 2 -pretreated LaCoO 3 and Pd/LaCoO 3 surfaces could be associated with the electronic changes (i.e. reduction of B-site cation), structural changes (surface reconstruction and SSA increase), reduction of the precious metal oxide (PdO) into metallic species (Pd), and the generation of oxygen defects on the perovskite. Mn-based systems were more resilient toward B-site reduction. Pd-addition suppressed the B-site reduction and preserved the ABO 3 perovskite structure.

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“…[ XRD analyses were performed on a Bruker AXS D8 Advance diffractometer as described earlier [11]. Likewise, unit cell parameters and crystallite sizes were determined by Rietveld refinement as before [11].…”

Section: Synthesis and Characterisationmentioning

confidence: 99%

“…More recently we proposed the possibility to improve the catalytic performances as well as thermal resistance to deactivation through the use of lanthanum-deficient synthesis for perovskite [11]. Higher intrinsic reaction rates were obtained on La-deficient perovskites after ageing at 900 • C overnight.…”

Section: Introductionmentioning

confidence: 98%

Enhancing catalytic activity of perovskite-based catalysts in three-way catalysis by surface composition optimisation

et al. 2015

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Stoichiometric and non-stoichiometric perovskite-based catalysts: Consequences on surface properties and on catalytic performances in the decomposition of N2O from nitric acid plants

Cited by 65 publications

References 34 publications

Surface reconstructions of LaCo1−xFexO3 at high temperature during N2O decomposition in realistic exhaust gas composition: Impact on the catalytic properties

Surface reconstructions of LaCo1−xFexO3 at high temperature during N2O decomposition in realistic exhaust gas composition: Impact on the catalytic properties

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

Enhancing catalytic activity of perovskite-based catalysts in three-way catalysis by surface composition optimisation

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