Ce–Zr–Sr ternary mixed oxides structural characteristics and oxygen storage capacity

Minwei, Zhao; Shen, Meiqing; Wen, Xie; Wang, Jun

doi:10.1016/j.jallcom.2007.03.086

Cited by 31 publications

(25 citation statements)

References 42 publications

(59 reference statements)

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“…Doping elements to Ce x Zr 1Àx O 2 solid solutions can further improve the ceria-zirconia catalytic performance and thermal resistance. The doping effects of alkaline earth metal on the OSC properties and thermal stability of CeO 2 -ZrO 2 have been widely investigated [21][22][23][24][25]. Inaba and Tagawa [26] reported that Sr 2+ and Ca 2+ had the optimum ionic radii and gave the minimum association enthalpy between doped ions and oxygen vacancies, which implied improved oxygen mobility in ceria-based materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of rare earth (La, Nd, Pr, Sm and Y) on the performance of Pd/Ce0.67Zr0.33MO2−δ three-way catalysts

Zhao

Wang

et al. 2013

Journal of Environmental Chemical Engineering

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Section: Introductionmentioning

confidence: 99%

Effect of rare earth (La, Nd, Pr, Sm and Y) on the performance of Pd/Ce0.67Zr0.33MO2−δ three-way catalysts

Zhao

Wang

et al. 2013

Journal of Environmental Chemical Engineering

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“…The broad line for the Ce 3d core level indicated that both Ce 3+ and Ce 4+ existed. The curves were fitted with eight peaks, which corresponded to the four pairs of spin-orbit doublets [19][20][21]. The letters V and U refer to the Ce 3d 5/2 and Ce 3d 3/2 spin-orbit components, respectively.…”

Section: Xpsmentioning

confidence: 99%

Effects of Adding CeO2 to Ag/Al2O3 Catalyst for Ammonia Oxidation at Low Temperatures

Zhang¹,

Yu²,

Zhang³

et al. 2011

Chinese Journal of Catalysis

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Abstract:The effects of adding CeO 2 to Ag/Al 2 O 3 on the selective catalytic oxidation of ammonia to nitrogen were investigated by activity test and N 2 physisorption, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis diffuse-reflectance spectroscopy, high resolution transmission electron microscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy of NH 3 adsorption, and O 2 -pulse adsorption. Adding a suitable amount of CeO 2 improved the catalytic activity of Ag/Al 2 O 3 for NH 3 oxidation at temperatures below 160 o C, and slightly influenced N 2 selectivity by improving the catalyst's ability to adsorb and activate O 2 and the adsorption and activation of NH 3 .Key words: ammonia; silver; cerium; alumina oxide; supported catalyst; oxygen uptake; high resolution transmission electron microscopy; in situ diffuse reflectance infrared Fourier transform spectroscopyThe selective catalytic oxidation (SCO) of NH 3 to nitrogen (N 2 ) and water can reduce NH 3 emissions from chemical processes such as the selective catalytic reduction (SCR) of NO x by NH 3 and from soda production [1][2][3][4][5]. In particular, the low temperature oxidation of NH 3 to N 2 has important environmental applications. Noble metals such as Pt and Ir are the most active but least selective [5][6][7]. Gang et al. [6,8] reported that an alumina-supported Ag (10 wt% Ag/Al 2 O 3 ) catalyst was extremely active for NH 3 oxidation at low temperatures, and was superior to the noble metals. Nonetheless, there is still a considerable need for better catalysts that are active at low temperatures. The addition of CeO 2 improves the NH 3 oxidation activities of Au-, Cu-, and Ag-based catalysts [2,3]. Lippits et al. [3] found that adding CeO x to Ag-based catalyst lowered the temperature for the onset of oxidation from 300 to 200 o C. However, the role of CeO 2 in the Ag-based catalyst has not been studied in detail. Recently, we investigated the SCO of NH 3 over a 10 wt% Ag/Al 2 O 3 catalyst and discovered that the Ag valence state and particle size were significant for activity and N 2 selectivity at low temperatures [7]. To further improve the catalytic performance at low temperatures, we investigated the catalytic effects and the role of CeO 2 addition on Ag/Al 2 O 3 for the oxidation of NH 3 . Experimental Catalyst preparation and H 2 -pretreatmentThe

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“…With a warmed up catalyst and at steady-state conditions conversions of more than 95% are reached for the three pollutants CO, NO and HC [1]. In recent years, typical TWC formulations have included Pd as the active metal, fluorite-type oxides, such as ceria-zirconia, as promoters and alumina as support as well as other minor components mainly present in order to enhance thermal stability [2][3][4]. In modern TWC formulations, the promotion by ceria has been extended to other structurally related oxide systems in order to increase or maintain the durability of the TWC while enhancing the oxygenstorage capacity (OSC) properties of the catalyst [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal treatment on catalytic performance of Pd/(Ce,Zr)Ox–Al2O3 three-way catalysts

Zhao

Yang

Wang

et al. 2010

Journal of Alloys and Compounds

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Ce–Zr–Sr ternary mixed oxides structural characteristics and oxygen storage capacity

Cited by 31 publications

References 42 publications

Effect of rare earth (La, Nd, Pr, Sm and Y) on the performance of Pd/Ce0.67Zr0.33MO2−δ three-way catalysts

Effect of rare earth (La, Nd, Pr, Sm and Y) on the performance of Pd/Ce0.67Zr0.33MO2−δ three-way catalysts

Effects of Adding CeO2 to Ag/Al2O3 Catalyst for Ammonia Oxidation at Low Temperatures

Influence of thermal treatment on catalytic performance of Pd/(Ce,Zr)Ox–Al2O3 three-way catalysts

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