A review on oxygen storage capacity of CeO2-based materials: Influence factors, measurement techniques, and applications in reactions related to catalytic automotive emissions control

Li, Ping; Chen, Xiaoyin; Li, Yongdan; Schwank, Johannes W.

doi:10.1016/j.cattod.2018.05.059

Cited by 262 publications

(173 citation statements)

References 226 publications

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“…The second reoxidation step was used for calculating the OSC dyn as difference in masses under the two atmospheres at specific temperatures (see chapter 2.2. for details). The OSC dyn is an important factor for the Diesel soot oxidation because the total available surface lattice oxygen is related to the OSC [31]. For the normal synthesis route, Ce 0.…”

Section: Osc Dyn and Tga Resultsmentioning

confidence: 99%

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Hebert

Stöwe

2020

Materials

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In this paper, the syntheses of a set of cerium-bismuth mixed oxides with the formula Ce 1−x Bi x O 2−x/2 , where the range of x is 0.0 to 1.0 in 10 mol% steps, via co-precipitation methods is described. Two synthesis routes are tested: The "normal" and the so called "reverse strike" (RS) co-precipitation route. The syntheses are performed with an automated synthesis robot. The activity for Diesel soot oxidation is measured by temperature programmed oxidation with an automated, serial thermogravimetric and differential scanning calorimetry system (TGA/DSC). P90 is used as a model soot. An automated and reproducible tight contact between soot and catalyst is used. The synthesized catalysts are characterized in terms of the specific surface area according to Brunauer, Emmett and Teller (S BET ), as well as the dynamic oxygen storage capacity (OSC dyn ). The crystalline phases of the catalysts are analysed by powder X-ray diffraction (PXRD) and Raman spectroscopy. The elemental mass fraction of the synthesized catalysts is verified by X-ray fluorescence (XRF) analysis. A correlation between the T 50 values, OSC dyn and S BET has been discovered. The best catalytic performance is exhibited by the catalyst with the formula RS-Ce 0.8 Bi 0.2 O x which is synthesized by the reverse strike co-precipitation route. Here, a correlation between activity, OSC dyn , and S BET can be confirmed based on structural properties.

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Section: Osc Dyn and Tga Resultsmentioning

confidence: 99%

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Hebert

Stöwe

2020

Materials

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“…First, using a noble metal solely as a catalyst is economically unsustainable because of the high price. Second, compared with various metal oxides such as TiO 2 , Fe 2 O 3 , SnO 2 , Co 3 O 4 , MnO x , and Al 2 O 3 , CeO 2 has been known to exhibit the best oxygen storage (release) capacity (OSC) due to its facile redox property . The OSC ensures stoichiometric composition of gases during air‐to‐fuel oscillation by releasing and storing oxygen under fuel‐lean and fuel‐rich conditions, respectively .…”

Section: Introductionmentioning

confidence: 99%

“…[9] Year Emission limits at 80,500 km 3 , CeO 2 has been known to exhibit the best oxygen storage (release) capacity (OSC) due to its facile redox property. [12][13][14] The OSC ensures stoichiometric composition of gases during air-to-fuel oscillation by releasing and storing oxygen under fuel-lean and fuel-rich conditions, respectively. [15] However, as the activity of CeO 2 is worse than that of noble metals, CeO 2 alone cannot effectively catalyze CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Design of Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

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A catalyst active to carbon monoxide (CO) oxidation at low temperature is essential for environmental conservation, saving fuel and improvement of the quality of human life. Rational design of CO oxidation catalyst on the basis of comprehensive understanding of physicochemical properties of catalytic materials, rather than simply searching for the catalyst based on trial‐and‐error, is a promising approach to meet the increasingly stringent regulations. This review covers metal‐doped and ‐loaded system based on CeO2 catalysts as strategies to significantly improve CO oxidation activity at low temperature. When incorporated into CeO2 lattice, active metals significantly lower the oxygen vacancy formation energy (Evf) of the catalyst surface, resulting in high catalytic activities at low temperature. When the active metals are loaded on the CeO2 surface, many active sites could be acquired by increasing the dispersion, and the catalytic activity can be dramatically improved by newly introducing the interfacial sites between the metals and the CeO2 support. Doping the support could further improve this loaded system in terms of specific surface area, oxygen vacancy formation, and spillover effects. In this review, based on this knowledge, we propose a rational design approach to a robust low‐temperature CO oxidation catalysts. The desirable CO oxidation catalysts identified from the interplay between theoretical and experimental approaches would ultimately improve the quality of human life, and create potential economic benefits by alleviating air pollution.

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“…The zirconia promoted catalyst displayed less oxygen storage capacity which is due to crystal structural defects; the introduction of Zr into a Co framework on a corresponding level would compensate the volume increase related to Co 2+ reduction. This would decrease the influence of valence change; shorten the Co-O bond length in the ZrO2-Co3O4/TiO2 as a result it detains some of oxygen sites on cobalt oxide and titania [40]. There was 3.54% weight loss observed for simple catalyst in second heating cycle while zirconia promoted catalyst lost 2.2% weight as shown in Figure 4a,b which corresponds to the oxygen releasing capacity of the catalysts in atmospheric conditions.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 91%

Effect of Zirconia on Hydrothermally Synthesized Co3O4/TiO2 Catalyst for NOx Reduction from Engine Emissions

2020

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Effect of zirconia on the 6 wt.% Co3O4/TiO2 catalyst for NOx reduction is investigated in this paper. Co3O4/TiO2 catalyst was prepared by using hydrothermal method and then was promoted with zirconia by impregnation to get 8% wt. ZrO2-Co3O4/TiO2 catalyst. Catalysts were characterized by using XRD, SEM, and TGA. Catalysts real time activity was tested by coating them on stainless steel wire meshes, containing them in a mild steel shell and mounting them at the exhaust tailpipe of a 72 cm3 motorcycle engine. Zirconia promoted catalyst showed higher conversion efficiency of NOX than the simple Co3O4/TiO2 catalyst due to small crystalline size, fouling inhibition and thermal stability.

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A review on oxygen storage capacity of CeO2-based materials: Influence factors, measurement techniques, and applications in reactions related to catalytic automotive emissions control

Cited by 262 publications

References 226 publications

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

Design of Ceria Catalysts for Low‐Temperature CO Oxidation

Effect of Zirconia on Hydrothermally Synthesized Co3O4/TiO2 Catalyst for NOx Reduction from Engine Emissions

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