Catalytic performance of Ag/Co-Ce composite oxides during soot combustion in O 2 and NO x : Insights into the effects of silver

Zou, Guchu; Fan, Zhijin; Yao, Xin; Zhang, Yi; Zhang, Zhixiang; Chen, Mingxia; Shangguan, Wenfeng

doi:10.1016/s1872-2067(17)62758-x

Cited by 23 publications

(7 citation statements)

References 53 publications

(52 reference statements)

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“…This indicates that the highest concentration of Ag + ions, which is contained mostly in CeO2:Ag 10:1 catalyst, can effectively promote 100% soot oxidation at Tf = 390 °C due to the oxygen species formed on Ag + sites. Zou et al [46] proposed that during silver oxide decomposition, its released oxygen migrates to soot surfaces to form carbonoxygen intermediates, which are subsequently oxidized further. Finally, the adsorbed oxygen on the silver promotes the regeneration process.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

et al. 2018

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Abstract:The catalytic behaviour of Ag 2 O and Ag doped CeO 2 thin films, deposited by atomic layer deposition (ALD), was investigated for diesel soot oxidation. The silver oxide was deposited from pulses of the organometallic precursor (hfac)Ag(PMe 3 ) and ozone at 200 • C with growth rate of 0.28 Å/cycle. Thickness, crystallinity, elemental composition, and morphology of the Ag 2 O and Ag doped CeO 2 films deposited on Si (100) were characterized by ellipsometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and field emission scanning electron microscopy (FESEM), respectively. The catalytic effect on diesel soot combustion of pure Ag 2 O, CeO 2, and Ag doped CeO 2 films grown on stainless steel foil supports was measured with oxidation tests. Nominally CeO 2 :Ag 10:1 doped CeO 2 films were most effective and oxidized 100% of soot at 390 • C, while the Ag 2 O films were 100% effective at 410 • C. The doped films also showed much higher stability; their performance remained stable after five tests with only a 10% initial reduction in efficiency whereas the performance of the Ag 2 O films reduced by 50% after the first test. It was concluded that the presence of Ag + sites on the catalyst is responsible for the high soot oxidation activity.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

et al. 2018

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“…Air pollution is not only tremendously disastrous to the ecological environment, but also significantly harmful to human health. An important source of atmospheric pollution is vehicle exhaust emission, particularly from diesel vehicles [1,2]. It is well known that soot particles emitted from diesel vehicles are the main source of PM2.5 in urban air [3].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional ordered macroporous perovskite-type La1–K NiO3 catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution

Mei

Xiong

Wei

et al. 2019

Chinese Journal of Catalysis

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“…To alleviate the contact problem, the design and preparation of high efficiency catalysts with the ability to activate oxygen at low temperatures is very important. In order to enhance the intrinsic activity and the ability to activate oxygen at low temperatures, a series of noble metals catalysts were also studied and they exhibit excellent catalytic performance for soot combustion, such as: Ag/Ce [13], Au-CoFe 2 O 4 [14], Ag/Co-Ce [15], Pt/H-ZSM5 [16] and Ag/Al 2 O 3 [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cordierite Monolith Catalysts with the Coating of K-Modified Spinel MnCo2O4 Oxide and Their Catalytic Performances for Soot Combustion

Zhao

Wang

et al. 2022

Catalysts

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Diesel engines are important for heavy-duty vehicles. However, particulate matter (PM) released from diesel exhaust should be eliminated. Nowadays, catalytic diesel particulate filters (CDPF) are recognized as a promising technology. In this work, a series of monolith Mn1−nKnCo2O4 catalysts were prepared by the simple citric acid method. The as-prepared catalysts displayed good catalytic performance for soot combustion and the Mn0.7K0.3Co2O4 catalyst gave the best catalytic performance among all the prepared samples. The T10 and Tm of Mn0.7K0.3Co2O4-HC catalyst for soot combustion are 310 and 439 °C, respectively. The physical and chemical properties of catalysts were characterized by means of SEM, XPS, H2-TPR, Raman and other techniques. The characterization results indicate that K substitution is favorable for the formation of oxygen vacancies, enhancing the mobility of active oxygen species, and improving the redox properties and so on. In-situ Raman results prove that the strength of Co-O bonds in the catalysts became weak during the reaction at high temperatures. In addition, SEM and ultrasonic test results show that the peeling rate of the coat-layer is less than 5%. The as-prepared catalysts can be taken as one kind of candidate catalyst for promising application in soot combustion because of its facile synthesis, low cost and high catalytic activity.

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Catalytic performance of Ag/Co-Ce composite oxides during soot combustion in O 2 and NO x : Insights into the effects of silver

Cited by 23 publications

References 53 publications

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

Three-dimensional ordered macroporous perovskite-type La1–K NiO3 catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution

Preparation of Cordierite Monolith Catalysts with the Coating of K-Modified Spinel MnCo2O4 Oxide and Their Catalytic Performances for Soot Combustion

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