Defect Chemistry and Catalysis in Oxidation and Reduction Over Perovskite‐type Oxides

Voorhoeve, R. J. H.; Remeika, J. P.; Trimble, L. E.

doi:10.1111/j.1749-6632.1976.tb34221.x

Cited by 225 publications

(136 citation statements)

References 43 publications

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“…The oxidation of hydrocarbons was supposed to occur on the perovskite surface by both suprafacial and intrafacial reaction [13] , which involved lattice oxygen in the bulk without gaseous oxygen, and the migration rate of oxygen in the bulk became more and more important for catalytic performance over LaFeO 3 perovskite as oxygen donor. The results over LaFeO 3 oxide of different amounts of replenished lattice oxygen are shown in Fig.7.…”

Section: Effect Of Different Amounts Of Replenished Lattice Oxygen Ovmentioning

confidence: 99%

Effect of calcination temperature and reaction conditions on methane partial oxidation using lanthanum-based perovskite as oxygen donor

Dai

Chen

et al. 2008

Journal of Rare Earths

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Abstract:We investigated the effect of calcination temperature, reaction temperature, and different amounts of replenished lattice oxygen on the partial oxidation of methane (POM) to synthesis gas using perovskite-type LaFeO 3 oxide as oxygen donor instead of gaseous oxygen, which was prepared by the sol-gel method, and the oxides were characterized by XRD, TG/DTA, and BET. The results indicated that the particle size increased with the calcination temperature increasing, while BET and CH 4 conversion declined with the calcination temperature increasing using LaFeO 3 oxide as oxygen donor in the absence of gaseous oxygen. CO selectivity remained at a high level such as above 92%, and increased slightly as the calcination temperature increased. Exposure of LaFeO 3 oxides to methane atmosphere enhanced the oxygen migration of in the bulk with time online owing to the loss of lattice oxygen and reduction of the oxidative stated Fe ion simultaneously. The high reaction temperature was favorable to the migration of oxygen species from the bulk toward the surface for the synthesis gas production with high CO selectivity. The product distribution and evolution for POM by sequential redox reaction was determined by amounts of replenished lattice oxygen with gaseous oxygen. The optimal process should decline the total oxidation of methane, and increase the selectivity of partial oxidation of methane.Keywords: perovskite LaFeO 3 ; lattice oxygen; synthesis gas; redox reaction; rare earths Renewed interest in methane conversion to synthesis gas, which can be used to produce a variety of chemicals by the Fischer-Tropsch and methanol synthesis, has arisen. Currently, large-scale industrial route for synthesis gas production was based on steam reforming of methane, which was a capital-and energy-intensive process owing to the highly endothermic nature of the reaction and also a large H 2 /CO ratio. The catalytic partial oxidation (CPO) offered the greatest potential for an efficient and economical conversion of methane to synthesis gas, owing to the high selectivity and suitable H 2 /CO ratio, but the Ni-based catalyst exhibited a rapid deactivation because of carbon deposition that has been reported [1] . Recently, a novel method for synthesis gas production by the direct use of lattice oxygen of perovskite has been proposed by our group [2][3][4] . This new route was superior to general partial oxidation of methane (POM) in stability (resistance to carbonaceous deposition), safety (avoiding effectively the accidental explosion), easy operation and optimization, and low cost (making use of air not oxygen) [4] . The present study aimed to explore the effect of calcination temperature and reaction temperature on catalytic activity for POM over perovskite-type LaFeO 3 oxide using lattice oxygen, and the product distribution was investigated by controlling the amount of replenished lattice oxygen with gaseous oxygen.

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Section: Effect Of Different Amounts Of Replenished Lattice Oxygen Ovmentioning

confidence: 99%

Effect of calcination temperature and reaction conditions on methane partial oxidation using lanthanum-based perovskite as oxygen donor

Dai

Chen

et al. 2008

Journal of Rare Earths

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“…1 shows the XRD patterns obtained during calcination ''in situ'' of the dried BaSnO 3 precursor. It follows that the BaSnO 3 precursor can be identified as Ba 2 SnO 2 (OH) 8 (H 2 O) 10 . In addition, small diffraction peaks corresponding to BaCO 3 are observed.…”

Section: Resultsmentioning

confidence: 99%

“…Using perovskite-type oxides as supports for noble metals, one can expect even higher activity of such systems in CO oxidation. The oxidation reaction on perovskite type oxides usually occurs through two different mechanisms introduced by Voorhoeve et al [10]. The first one, known as a suprafacial mechanism, is connected with chemisorbed oxygen, while the second (the intrafacial mechanism) corresponds to oxidation via lattice oxygen.…”

Section: Introductionmentioning

confidence: 99%

CO and H2 oxidation over Pt/BaSnO3 catalysts

Kocemba

Długołęcka

Wróbel-Jędrzejewska

et al. 2017

Reac Kinet Mech Cat

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This work reports the results of the studies on oxidation of carbon monoxide and H 2 over Pt supported on barium stannate (BaSnO 3 -perovskite type oxide). The composition and properties of Pt/BaSnO 3 catalysts were characterized by X-ray diffraction (XRD), time-of-flight secondary ion mass spectrometry (TOF-SIMS), H 2 and CO chemisorption, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and tested in the reactions of carbon monoxide and hydrogen oxidation. It was stated that platinum strongly interacts with BaSnO 3 . The catalytic activity and adsorption properties of Pt/BaSnO 3 catalysts are determined by these interactions. The presence of different species (which generally can be labelled as [(Pt)BaSnO 3 ]) resulting from platinum and BaSnO 3 chemical interaction was found by the TOF-SIMS on surface of Pt/BaSnO 3 catalysts. The mechanism of CO and H 2 oxidation over Pt/BaSnO 3 catalysts was discussed in the light of strong interactions between Pt and BaSnO 3 .

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“…Lattice oxygen species migrate from the bulk to the surface and participate in methane oxidation. Consumed lattice oxygen is replenished by gaseous oxygen through a Mars-Van Krevelen mechanism [13,29,30]. The higher activity of La 0.8 Sr 0.2 FeO 3 for methane combustion was probably related to the presence of oxygen vacancies, but the mechanism differed from that in CO oxidation.…”

Section: Catalytic Testsmentioning

confidence: 99%

“…The T 50 (temperature at which the conversion of CO was 50%) was 559 K on La 0.8 Sr 0.2 FeO 3 and 585 K on LaFeO 3 . CO oxidation at low temperature on perovskites is considered as a surface process [29], and the activity is closely linked with surface oxygen vacancies that facilitated the adsorption of the reactant molecule and accelerated the dissociation of oxygen molecules [14,24]. Therefore, the oxygen vacancies in La 0.8 Sr 0.2 FeO 3 , observed in the H 2 -TPR measurement, were mainly responsible for the better performance in CO oxidation.…”

Section: Catalytic Testsmentioning

confidence: 99%

Structural Properties and Catalytic Activity of Sr-Substituted LaFeO3 Perovskite

Zhang

et al. 2012

Chinese Journal of Catalysis

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Defect Chemistry and Catalysis in Oxidation and Reduction Over Perovskite‐type Oxides

Abstract: the relationships between the catalytic activity and the defect chemistry of perovskitelike cobaltites, manganites, chromites, and ruthenates.The crystal structure of perovskite (CaTi03) is shown in FIGURE 1. The 97.1, 3

Cited by 225 publications

References 43 publications

Effect of calcination temperature and reaction conditions on methane partial oxidation using lanthanum-based perovskite as oxygen donor

Effect of calcination temperature and reaction conditions on methane partial oxidation using lanthanum-based perovskite as oxygen donor

CO and H2 oxidation over Pt/BaSnO3 catalysts

Structural Properties and Catalytic Activity of Sr-Substituted LaFeO3 Perovskite

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