Characteristics of CeO2–ZrO2 mixed oxide prepared by continuous hydrothermal synthesis in supercritical water as support of Rh catalyst for catalytic reduction of NO by CO

Kim, Jeong‐Rang; Myeong, Wan-Jae; Ihm, Son Ki

doi:10.1016/j.jcat.2009.02.001

Cited by 79 publications

(37 citation statements)

References 38 publications

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“…[11][12][13] Several studies have found that active oxygen sites (oxygen vacancies) can interact with active metals to improve the performances of the catalysts. 14,15 Thus, CeO 2 -ZrO 2 solid solution can be used as support for CO 2 methanation catalysts.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Zhu

Razzaq

et al. 2013

AIChE Journal

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A series of active oxygen material Ce x Zr 12x O 2 -supported NiACo bimetallic nanosized catalysts were prepared by coprecipitation method, which is simple and fit for industrial use with lower cost than other methods. The effect of CeO 2 / ZrO 2 mole ratio, Co metal addition, and PEG-6000 addition were investigated. The catalysts were characterized through X-ray diffraction, H 2 thermal-programmed reduction, N 2 adsorption, Raman spectroscopy, CO pulse chemisorption, X-ray photoelectron spectroscopy, oxygen storage capacity, and transmission electron microscopy-energy dispersive X-ray analysis. Modifications of the structural and redox properties of these materials were evaluated in relation to their catalytic performances. Particularly, the relationship between the active oxygen sites of the catalysts and their catalytic performances was investigated. The interaction between active metals (Ni and Co) and Ce x Zr 12x O 2 support was found to be very important for catalytic performance. The active oxygen site of Ce x Zr 12x O 2 can considerably improve catalytic performance. Appropriate Co metal addition also remarkably enhanced the catalytic stability and activity. Moreover, PEG-6000 addition can improve the Brunauer-Emmett-Teller surface area and active metal dispersion of catalysts to improve their performances. The nanosized catalyst 15 wt % Ni-5 wt % Co/Ce 0.25 Zr 0.75 O 2 prepared by adding 5 wt % PEG-6000 achieved almost 85% CO 2 conversion and 98% selectivity to methane at 280 C when the gas hourly space velocity was 10,000 h 21 .

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Section: Introductionmentioning

confidence: 99%

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Zhu

Razzaq

et al. 2013

AIChE Journal

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“…The CeO 2 -ZrO 2 solid solution is an important oxygen-storage component for the use in automobile catalysts [1][2][3][4]. It has been reported that the oxygen storage capacity (OSC) is generated by interconversion between Ce 4+ and Ce 3+ under oxidative and reductive conditions [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the oxygen storage capacity (OSC) is generated by interconversion between Ce 4+ and Ce 3+ under oxidative and reductive conditions [5,6]. The OSC of the CeO 2 -ZrO 2 solid solution depends largely on the method of preparation; many physical properties such as crystallinity, crystallite and particle sizes, and homogeneity change depending upon its preparation methods and, thus, influence the OSC [7], and many methods such as solid-state reaction [8], high-energy milling [9], coprecipitation method [10,11], sol-gel method [12,13], citrate complex method [14], polymerized complex method [15], combustion synthesis [16,17], and hydrothermal method [18,19] have been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Hosokawa

Imamura

Iwamoto

et al. 2011

Journal of the European Ceramic Society

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The glycothermal (GT) reaction of Ce acetate and Zr alkoxide directly yielded CeO2-ZrO2 solid solutions in a region of low Ce content ≤40 mol%. Of the CeO2-ZrO2 solid solutions obtained by the GT method and subsequent calcination at 500 or 800 ºC, the sample with 20 mol% Ce content had the largest BET surface area. This sample exhibited the highest Ce-based oxygen release capacity in the whole Ce/Zr composition range.The oxygen release capacities of CeO 2 -ZrO 2 solid solutions synthesized by the GT method were much larger than those of the samples prepared by a coprecipitation (CP) method. The Rietvelt analysis and the repetitive reduction-oxidation experiment indicated that the CeO 2 -ZrO 2 solid solution synthesized by the GT method has a homogeneous structure as compared with that prepared by the CP method.2

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“…For fresh CZPA-P, the presence of two reduction peaks at 619 and 782°C indicates that there are at least two types of Ce 4+ located in different chemical environments. The reduction peak at 619°C could be assigned to the reduction of surface Ce 4+ , whereas the peak at 782°C could be assigned to the reduction of bulk Ce 4+ (He et al, 2003;Kim et al, 2007;Kim et al, 2009;Thammachart et al, 2001). The temperature of bulk reduction of fresh CZPA-P is lower than that of pure CeO 2 (Boaro et al, 2003) due to the increased mobility of bulk oxygen in fresh CZPA-P. After thermal aging, the reduction peaks in the TPR experiment with CZPA-S sample shifts slightly towards lower temperature.…”

Section: H 2 -Tprmentioning

confidence: 94%

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

Tian

2012

Braz. J. Chem. Eng.

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-Nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings were prepared by impregnating the cordierite ceramic honeycomb in the sol or in the slurry of already calcined powder, respectively. The effects of preparation methods on the crystal phase, texture, oxygen storage capacity (OSC), reducibility, surface morphology and thermal stability of coatings were investigated by X-ray diffraction (XRD), the Brunauer Emmet Teller (BET) method, the oxygen pulsing technique, H 2 -temperature-programmed reduction (H 2 -TPR) and scanning electron microscopy (SEM). These nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings were used as supports to prepare Pd-only three-way catalysts, and evaluated with respect to catalytic activities. The results indicate that the nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings prepared by the two methods have high thermal stability. However, the coating derived from the sol shows better crystalline structure, texture, reducibility and oxygen storage capacity than the coating derived from the slurry. SEM observation shows that the morphology of the coating derived from the sol is uniform and smooth. The Pd-only catalyst derived from the sol exhibits high three-way catalytic activity at low temperature and thermal stability, suggesting a great potential for applications.

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Characteristics of CeO2–ZrO2 mixed oxide prepared by continuous hydrothermal synthesis in supercritical water as support of Rh catalyst for catalytic reduction of NO by CO

Cited by 79 publications

References 38 publications

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

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Characteristics of CeO2–ZrO2 mixed oxide prepared by continuous hydrothermal synthesis in supercritical water as support of Rh catalyst for catalytic reduction of NO by CO

Cited by 79 publications

References 38 publications

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

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Product

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Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts