NO Decomposition on Ruddlesden–Popper-Type Oxide, Sr3Fe2O7, Doped with Ba and Zr

Ishihara, Tatsumi; Shinmyo, Yusuke; Goto, Kazuya; Nishiyama, Noriko; Iwakuni, Hideharu; Matsumoto, Hiroshige

doi:10.1246/cl.2008.318

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…In other words, transition metals such as Ni, Cu, and Co located at the B-sites are the catalytically active sites for NO decomposition. On the other hand, Goto and Ishihara [49,50] reported that Ba 3 Y 3.4 Sc 0.6 O 9 with a perovskiterelated structure, consisting of alkaline earth and rare earth ions, shows high NO decomposition activity in a wide temperature range of 600e850 C. They also revealed that the addition of BaO into BaY 2 O 4 caused a significant increase in the NO decomposition activity [51]. It should be noted that both catalysts do not contain transition metals as catalytically active sites, and that there are no detectable oxide ion vacancies in the BaO/BaY 2 O 4 catalyst, although Ba 3 Y 3.4 Sc 0.6 O 9 includes intrinsic oxygen defects in the structure.…”

Section: Perovskite-type Oxidesmentioning

confidence: 99%

Recent progress in catalytic NO decomposition

Haneda

Hamada

2016

Comptes Rendus. Chimie

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a b s t r a c tRecent progress in catalytic direct NO decomposition is overviewed, focusing on metal oxide-based catalysts. Since the discovery of the Cu-ZSM-5 catalyst in the early 1990s, various kinds of catalytic materials such as perovskites, C-type cubic rare earth oxides, and alkaline earth based oxides have been reported to effectively catalyze direct NO decomposition. Although the activities of conventional catalysts are poor in the presence of coexisting O 2 and CO 2 , some of the catalysts reviewed in this article possess significant tolerance toward these coexisting gases. The active sites for direct NO decomposition are different depending on the types of metal oxide-based catalysts. In the case of perovskite type oxides, oxide anion vacancies act as catalytically active sites on which NO molecules are adsorbed. C-type cubic rare earth oxides contain oxide anion vacancies with large cavity space, enabling easy access of NO molecules and their subsequent adsorption. Surface basic sites on alkaline earth based oxides participate in NO decomposition as active sites on which NO molecules are adsorbed as NO 2 À species. The reaction mechanisms of direct NO decomposition are also discussed.

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Section: Perovskite-type Oxidesmentioning

confidence: 99%

Recent progress in catalytic NO decomposition

Haneda

Hamada

2016

Comptes Rendus. Chimie

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“…A number of materials have been reported as active catalysts for direct NO decomposition, such as zeolites,36 noble metals,37 perovskites,38–42 and other mixed or complex oxides 43–51. However, several problems remain unsolved, which prevent the practical application of such catalysts under exhaust conditions.…”

Section: Advanced Nox Direct Decomposition Catalystsmentioning

confidence: 99%

Advanced materials for environmental catalysts

Imanaka

Masui

2009

The Chemical Record

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Recent advances in the synthesis and characterization of materials for environmental catalysts are reported in this paper. Highly advanced environmental catalysts for decomposition of volatile organic compounds and nitrogen oxides were artificially designed based on a concept usually employed in the fields of solid-state chemistry and solid-state ionics. Catalytically active materials for complete ethylene oxidation were prepared by a citrate sol-gel method as a key process to obtain CeO(2)-ZrO(2)-Bi(2)O(3) solid solutions. On the other hand, direct NO decomposition catalysts were designed and prepared focusing on the open spaces and oxide anion vacancies in the crystal lattice. Evaluation of the materials as environmental catalysts demonstrated significant advantages over the conventional ones. The design strategy, synthetic method, and structural features of these concerto catalysts are addressed.

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“…Recently, Sr 3 Fe 2 O 7−δ , a double-layered oxide with two SrFeO 3 perovskite layers sandwiched by the SrO rock salt layers, came into sights for its good oxygen 10 and water 11 storage capacity and high catalytic activity toward NO decomposition. 12 Unlike the formation of interstitial oxygen at rock salt layer in A 2 BO 4 oxides, oxygen vacancies were reported to form at the intersection point of two perovskite layers 13 and protons are prone to form at the rock salt layer the moisture atmosphere. 14 In our recent work, we demonstrated SFO as an effective cathode in proton conducting SOFCs, the resulted performance is among one of the best so far.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Although their catalytic activities toward ORR are not so ideal, these R–P oxides provides the useful information on the fundamental understanding of the transporting properties within their special structures. Recently, Sr 3 Fe 2 O 7−δ , a double-layered oxide with two SrFeO 3 perovskite layers sandwiched by the SrO rock salt layers, came into sights for its good oxygen and water storage capacity and high catalytic activity toward NO decomposition . Unlike the formation of interstitial oxygen at rock salt layer in A 2 BO 4 oxides, oxygen vacancies were reported to form at the intersection point of two perovskite layers and protons are prone to form at the rock salt layer the moisture atmosphere .…”

Section: Introductionmentioning

confidence: 99%

High-Performanced Cathode with a Two-Layered R–P Structure for Intermediate Temperature Solid Oxide Fuel Cells

Huan

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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Driven by the mounting concerns on global warming and energy crisis, intermediate temperature solid-oxide fuel cells (IT-SOFCs) have attracted special attention for their high fuel efficiency, low toxic gas emission, and great fuel flexibility. A key obstacle to the practical operation of IT-SOFCs is their sluggish oxygen reduction reaction (ORR) kinetics. In this work, we applied a new two-layered Ruddlesden-Popper (R-P) oxide, Sr3Fe2O7-δ (SFO), as the material for oxygen ion conducting IT-SOFCs. Density functional theory calculation suggested that SFO has extremely low oxygen ion formation energy and considerable energy barrier for O(2-) diffusion. Unfortunately, the stable SrO surface of SFO was demonstrated to be inert to O2 adsorption and dissociation reaction, and thus restricts its catalytic activity toward ORR. Based on this observation, Co partially substituted SFO (SFCO) was then synthesized and applied to improve its surface vacancy concentration to accelerate the oxygen adsorptive reduction reaction rate. Electrochemical performance results suggested that the cell using the SFCO single phase cathode has a peak power density of 685 mW cm(-2) at 650 °C, about 15% higher than those when using LSCF cathode. Operating at 200 mA cm(-2), the new cell using SFCO is quite stable within the 100-h' test.

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NO Decomposition on Ruddlesden–Popper-Type Oxide, Sr3Fe2O7, Doped with Ba and Zr

Cited by 18 publications

References 12 publications

Recent progress in catalytic NO decomposition

Recent progress in catalytic NO decomposition

Advanced materials for environmental catalysts

High-Performanced Cathode with a Two-Layered R–P Structure for Intermediate Temperature Solid Oxide Fuel Cells

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