A new concept in high performance ceria–zirconia oxygen storage capacity material with Al2O3 as a diffusion barrier

Morikawa, Akira; Suzuki, Tadashi; Kanazawa, Tadahiro; Kikuta, Koichi; Suda, Akihiko; Shinjo, Hirofumi

doi:10.1016/j.apcatb.2007.09.013

Cited by 176 publications

(102 citation statements)

References 17 publications

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“…Th e CeZrO 4 crystallite sizes in these two catalysts were almost identical (see results at 700 °C in Fig. 3) and the Pt particle size in the ACZ catalyst (0,7 nm), which was measured by low temperature CO adsorption technique [7]. The value was about one-half of the Pt particle size in CZ (1,2 nm); in other words, the numbers of activation sites for the oxygen release in ACZ were twice as much as that in CZ.…”

Section: Resultsmentioning

confidence: 95%

“…CO and CO 2 were analyzed by a non-dispersive infrared (ND-IR) type analyzer and O 2 was quantifi ed with a magnetic oxygen analyzer. [7].…”

Section: Evaluation Of Catalytic Performancementioning

confidence: 99%

“…This composite oxide was prepared by co-precipitation process of nitrate and following the calcination at 700 °C [7], which had a composition of 1/1/1 molecular ratio of Al 2 O 3 / CeO 2 /ZrO 2 . Th e CeZrO 4 solid solution without Al 2 O 3 was used as a comparative material, which is abbreviated as CZ.…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

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Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Morikawa¹,

Suzuki²,

Kikuta³

et al. 2009

Epitoanyag - JSBCM

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Az OSC (oxigéntároló képesség) teljesítménynövelése Al 2 O 3 diffúziógátat tartalmazó CeZrO 4 szilárd oldatban Annak érdekében, hogy a CeO 2 -ZrO 2 szilárd oldata (CeZrO 4 ) még inkább felhasználható legyen az autóipari kipufogógáz-katalizátorok oxigéntároló anyagaként, kidolgoztunk egy Al 2 O 3 és CeZrO 4 vegyületekből álló, nanométer finomságú kompozit anyagot (az ACZ-t). Az oxigéntároló képesség (OSC) további javítása céljából a szerzők szisztematikus kutatást végeztek, amely kimutatta, hogy a többlet Al 2 O 3 adagolás nemcsak a CeZrO 4 termikus stabilitását növeli, hanem annak oxigén-tároló képességét, különösen pedig az oxigén leadását (OSC-r) is. E vizsgálatok során a redukáló kezelés révén jelentősen javult az ACZ teljes OSC-je (az OSC-c). A redukált ACZ OSC-c mutatószá-ma az 1000°C hőmérsékleten végzett kezelés után érte el elméleti maximumát.

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Section: Resultsmentioning

confidence: 95%

“…CO and CO 2 were analyzed by a non-dispersive infrared (ND-IR) type analyzer and O 2 was quantifi ed with a magnetic oxygen analyzer. [7].…”

Section: Evaluation Of Catalytic Performancementioning

confidence: 99%

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Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Morikawa¹,

Suzuki²,

Kikuta³

et al. 2009

Epitoanyag - JSBCM

Self Cite

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“…CeO 2 -ZrO 2 solid solution is well-known as an excellent supporter for OSC [1]. CeO 2 exhibits oxygen storage/release behavior by the redox reaction of Ce ions between Ce 3+ and Ce 4+ [2], and the introduction of ZrO 2 into CeO 2 improves the reduction temperature of CeO 2 through structural modification of CeO 2 [3]. Among many studies on CeO 2 based materials such as CeO 2 -Al 2 O 3 [4], CeO 2 -SiO 2 [5], CeO 2 -La 2 O 3 [3] [6] [7], CeO 2 -TbO x [8], and CeO 2 -PrO x [9] have been reported to improve OSC and increase the thermal stability.…”

Section: Introductionmentioning

confidence: 99%

“…Three way catalysts (TWCs) are capable of simultaneous converting CO, hydrocarbon (HC) and nitrogen oxides (NO x ) into harmless CO 2 Oxygen storage capacity (OSC) is one of the crucial factors for the performance of TWCs, and the higher OSC promotes the better dynamic performance of catalysts in converting CO, HC and NO x under conditions from rich to lean A/F (λ-value) in automotive. CeO 2 -ZrO 2 solid solution is well-known as an excellent supporter for OSC [1].…”

Section: Introductionmentioning

confidence: 99%

Effects of CuO-CeO<sub>2</sub> Addition on Structure and Catalytic Properties of Three Way Catalysts

Luong¹,

Tien²,

Yamasue³

et al. 2017

MSCE

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The noble metals (Pt, Pd, Rh) supported on Cu-Ce mixed oxides with γ-Al 2 O 3 washcoat/FeCrAl substrate were investigated as catalytic performance of Three Way Catalysts (TWC) under simulated automotive exhaust feed gas. The structural, morphological features and catalytic activity were observed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS) and GC-TCD (Varian CP-4900). The catalytic performance of noble metals (Pt, Rh, Pd) supported on Cu-Ce mixed oxides with γ-Al 2 O 3 washcoat/FeCrAl substrate was be compared with noble metals (Pt, Rh, Pd) supported on Ce-Zr mixed oxides with γ-Al 2 O 3 washcoat/FeCrAl substrate and only γ-Al 2 O 3 washcoat/FeCrAl substrate at various stoichiometric ratio of oxygen. The results showed that the addition of Cu-Ce mixed oxides improved CO oxidation reaction at lower temperature during stable lambda of 1, the highest CO conversion of 99% is observed for the noble metals (Pt, Pd, Rh) support on Cu-Ce with γ-Al 2 O 3 washcoat/FeCrAl substrate. The results also showed that, the addition of Cu-Ce mixed oxides promoted released oxygen, thus it improved strongly CO and C 3 H 8 conversion at lean oxygen stoichiometric operation.

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Conventional and New Materials for Selective Catalytic Reduction (SCR) of NO_x

2018

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It is important and necessary to minimize NOx pollutant released into the atmosphere owing to the harmful environmental and health effects brought by NOx emission. Many techniques are available to reduce NOx emission, among of them, Selective Catalytic Reduction (SCR) is considered as one of the most efficient techniques. Conventional SCR systems involve ammonia (NH3) or urea (CO(NH2)2) as a reducing reagent to reduce NOx to N2 and H2O at high temperatures 300–400 °C. Research on developing novel low‐temperature catalysts (LTC) for SCR of NOx still remains of interest. This work reviewed and compared conventional SCR catalysts with newly emerging Metal‐Organic‐Frame (MOFs) materials as potential alternatives for SCR catalysts.

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A new concept in high performance ceria–zirconia oxygen storage capacity material with Al2O3 as a diffusion barrier

Cited by 176 publications

References 17 publications

Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Effects of CuO-CeO<sub>2</sub> Addition on Structure and Catalytic Properties of Three Way Catalysts

Conventional and New Materials for Selective Catalytic Reduction (SCR) of NO_x

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A new concept in high performance ceria–zirconia oxygen storage capacity material with Al2O3 as a diffusion barrier

Cited by 176 publications

References 17 publications

Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Effects of CuO-CeO&lt;sub&gt;2&lt;/sub&gt; Addition on Structure and Catalytic Properties of Three Way Catalysts

Conventional and New Materials for Selective Catalytic Reduction (SCR) of NOx

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Effects of CuO-CeO<sub>2</sub> Addition on Structure and Catalytic Properties of Three Way Catalysts

Conventional and New Materials for Selective Catalytic Reduction (SCR) of NO_x