Catalytic evaluation of promoted CeO2-ZrO2 by transition, alkali, and alkaline-earth metal oxides for diesel soot oxidation

Alinezhadchamazketi, A; Khodadadi, Abbas Ali; Mortazavi, Yadollah; Nemati, A

doi:10.1016/s1001-0742(12)60334-9

Cited by 39 publications

(23 citation statements)

References 44 publications

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“…Adding low melting point metal salts can improve the catalytic activity [301], and alkali metals have been reported as a molten salt to promote catalyst-soot contact by increasing surface mobility [102,302,303]. Neyertz et al [279] reported that the introduction of K promoted the catalytic performances of K/CeO2/cordierite and K/Ce0.65Zr0.35O2/cordierite for soot combustion.…”

Section: Effect Of Active Phasementioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

102

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Section: Effect Of Active Phasementioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

102

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“…In comparison with the peak strength and the peak temperature, Ce 5 Zr 2 K 2 /rGO showed a better catalytic performance among the CeZrK/rGO catalysts, which can be derived from its abundant reactive oxygen species and reasonable metal doping concentration, improving the mobility of adsorbed oxygen and lattice oxygen. Tables 5 and 6 compare the catalytic performance of various catalysts with high catalytic activity, including perovskite catalysts, noble metal catalysts, and CeZrK/rGO catalysts for soot oxidation [9,19,30,[50][51][52][53][54][55][56][57][58][59]. It is clear that the CeZrK/rGO catalysts by doping metal oxide particles onto graphene have higher catalytic activity than other catalysts, especially for Ce5Zr2K2/rGO.…”

Section: Evaluation On Catalytic Activity For Soot Oxidationmentioning

confidence: 99%

“…Generally, Ce5Zr2K2/rGO is a promising catalyst for the catalytic oxidation of soot in the CDPF owing to the advantages of easy synthesis, low cost, and high catalytic activity. Tables 5 and 6 compare the catalytic performance of various catalysts with high catalytic activity, including perovskite catalysts, noble metal catalysts, and CeZrK/rGO catalysts for soot oxidation [9,19,30,[50][51][52][53][54][55][56][57][58][59]. It is clear that the CeZrK/rGO catalysts by doping metal oxide particles onto graphene have higher catalytic activity than other catalysts, especially for Ce 5 Zr 2 K 2 /rGO.…”

Section: Evaluation On Catalytic Activity For Soot Oxidationmentioning

confidence: 99%

Experimental Evaluation on the Catalytic Activity of a Novel CeZrK/rGO Nanocomposite for Soot Oxidation in Catalyzed Diesel Particulate Filter

Tang

et al. 2021

Processes

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A nanostructured solid solution catalyst CeZrK/rGO for soot oxidation in catalyzed diesel particulate filter was synthesized using the dipping method. The reduced graphene oxide (rGO) was used as the catalyst carrier, and CeO2, ZrO2, and K2O were mixed with the molar ratio of 5:1:1, 5:2:2 and 5:3:3, which were referred to as Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO, respectively. The structure, morphology and catalytic activity of the CeZrK/rGO nanocomposites were thoroughly investigated and the results show that the CeZrK/rGO nanocomposites have nanoscale pore structure (36.1–36.9 nm), high-dispersion quality, large specific surface area (117.2–152.4 m2/g), small crystallite size (6.7–8.3 nm), abundant oxygen vacancies and superior redox capacity. The 50% soot conversion temperatures of Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO under tight contact condition were decreased to 352 °C, 339 °C and 358 °C respectively. The high catalytic activity of CeZrK/rGO nanocomposites can be ascribed to the following factors: the doping of Zr and K ions causes the nanocrystalline phase formation in CeZrK solid solutions, reduces the crystallite size, generates abundant oxygen vacancies and improves redox capacity; the rGO as a carrier provides a large specific surface area, thereby improving the contact between soot and catalyst.

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“…It is not clear if Ce and Zr act synergistically as in crystalline compounds [67], although both Ce and Zr help to stabilize the silica network. K promoted Ce-Zr catalysts have been reported [68,69]. In a series of M-Ce-Zr (M = Mn, Cu, Fe, K, Ba, Sr), catalysts, K-Ce-Zr had the highest catalytic activity under loose contact condition, which was suggested to be due to improvement of the soot-catalyst contact [68].…”

Section: Hydrothermal Testing Of Kcesz-1 Glass Compositionmentioning

confidence: 99%

“…K promoted Ce-Zr catalysts have been reported [68,69]. In a series of M-Ce-Zr (M = Mn, Cu, Fe, K, Ba, Sr), catalysts, K-Ce-Zr had the highest catalytic activity under loose contact condition, which was suggested to be due to improvement of the soot-catalyst contact [68]. Neyertz, et al investigated potassium-promoted Ce 0.65 Zr 0.35 O 2 catalysts [69].…”

Section: Hydrothermal Testing Of Kcesz-1 Glass Compositionmentioning

confidence: 99%

Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts

Zokoe

Feng

et al. 2019

Catalysts

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The hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar free energies of the hydration reactions (ΔGi) of the cation species in the glass. The result is a glass that shows less formation of precipitates after 2 h hydrothermal exposure in air with 7% H2O at temperatures ranging from 300–700 °C. A K-Ca-Si-O glass with a soot T50 (the temperature when 50% of the soot is oxidized) of 394 °C was found to degrade to 468 °C after a 2 h, 700 °C hydrothermal exposure, whereas the improved K-Ce-Zr-Si-O glass only changed from 407 °C to 427 °C after the same treatment.

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Catalytic evaluation of promoted CeO2-ZrO2 by transition, alkali, and alkaline-earth metal oxides for diesel soot oxidation

Cited by 39 publications

References 44 publications

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Experimental Evaluation on the Catalytic Activity of a Novel CeZrK/rGO Nanocomposite for Soot Oxidation in Catalyzed Diesel Particulate Filter

Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts

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