Activity and thermal stability of Pt/Ce0.64Mn0.16R0.2Ox (R=Al, Zr, La, or Y) for soot and NO oxidation

Zhang, Hailong; Zhu, Yi; Wang, Shi-Dan; Zhao, Ming; Gong, Maochu; Chen, Yaoqiang

doi:10.1016/j.fuproc.2015.03.027

Cited by 40 publications

(15 citation statements)

References 41 publications

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“…5,7 Diesel particulate lters (DPFs) combined with catalytic combustion of renewable technology is considered to be an efficient aer-treatment of soot oxidation; 3,5,[8][9][10] an effective catalyst with a lower light-off temperature is extremely important for DPF regeneration. 5,7,[9][10][11][12][13] Recently, CeO 2 has not only been reported to be used successfully in three-way catalysts, [14][15][16][17] but also as an excellent catalyst for soot combustion, 3,7,12,[18][19][20] because of its remarkable oxygen storage capacity (OSC) and redox property. Thus, CeO 2 -based catalysts have been investigated by several researchers, with respect to CeO 2 doped with noble (e.g., Ag, Pt and Pd), 17,21 transition (Cu, Mn, Co and Fe), [22][23][24] and lanthanide (La and Pr) metals.…”

Section: -6mentioning

confidence: 99%

“…The preparation methods of CeO 2 -based catalysts mainly include coprecipitation, 3,5,7,8,12,13,22,27,30,31,39 hydrothermal, [40][41][42] citric acid complex combustion, 23 sol-gel, 2,33,43,44,46-48 solution combustion, 40,41 solid-state, 26 impregnation, 45 (inverse) microemulsion, 25,32,35 and solid-phase grinding methods. 34,35 Among them, the solid-phase grinding method is the easiest technique to control the positions of the metal atoms in the structure.…”

Section: 14mentioning

confidence: 99%

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Design structure for CePr mixed oxide catalysts in soot combustion

Fan

Zhu

et al. 2017

RSC Adv.

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Four CePr mixed oxides with different structures were designed and synthesized using a solid-phase grinding method: a uniform solid solution of Ce and Pr (CePr-NN), Pr 6 O 11 -coated CeO 2 (CePr-NO), CeO 2 -coated Pr 6 O 11 (CePr-ON), and particle packing of CeO 2 and Pr 6 O 11 (CePr-OO) were obtained, and characterized by XRD, H 2 -TPR, TEM and TG. The results show that CePr-NN exhibits the best low temperature catalytic activity among the CePr catalysts. CeO 2 is the major active phase on the surface of the CePr catalysts, and the use of Pr 6 O 11 as the framework maintains the thermal stability of the CePr composite oxide. Moreover, both the oxygen storage capacity and mobility of the active oxygen of the catalyst were improved with the incorporation of Pr into CeO 2 , resulting in a higher combustion rate. The "molten state" which appeared during the preparation when nitrate was used as the precursor, plays a significant role in the migration of Ce and Pr, and is the premise of forming different structures of solid solution or coating structure.

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Section: -6mentioning

confidence: 99%

Section: 14mentioning

confidence: 99%

Design structure for CePr mixed oxide catalysts in soot combustion

Fan

Zhu

et al. 2017

RSC Adv.

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“…CeO 2 is widely concerned for its relatively low price and good oxygen storage and release capacity, which is the key point to regulate the catalytic oxidation-reduction process. [2,3,[7][8][9][10] However, ceria has some problems, such as poor thermal stability and easy sintering at high temperature. [11,12] Cho et al found that the doping of Y 3 + , La 3 + , Ga 3 + and Zr 4 + can improve the thermal stability of ceria, especially the doping of Zr 4 + , which not only improves the oxygen storage and release capacity of the composite oxide, but also improves the shortcomings of pure ceria, such as easy high-temperature sintering and reduced oxidation-reduction capacity with the decrease of specific surface area of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Activity Test and Mechanism Study of 3DOM Ce_0.8M_0.1Zr_0.1O₂ (M=Cr, Sn, Fe, Co, Ni, Mn, Cu) Catalyst in the Selective Catalytic Reduction of NO by CO**

Liu

Líu

et al. 2021

ChemCatChem

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The results show that the NO conversion rate of 3DOM Ce 0.8 Cu 0.1 Zr 0.1 O 2 catalyst at a lower temperature (150 °C) is close to 60 %. Besides, 3DOM Ce 0.8 Cu 0.1 Zr 0.1 O 2 kept a stable NO removal efficiency within a wide range of gas hourly space velocity (GHSV) and long reaction time and exhibited remarkable resistance to H 2 O and SO 2 poisoning, both individually and simultaneously. At the same time, the formation of the 3DOM structure not only improves the reduction performance and surface active sites of the catalyst, but also forms more oxygen defects and Ce 3 + in the catalyst due to the strong synergistic effect of metal ions and ceria, which improves the surface oxygen concentration of the composite oxide catalyst and further improves the catalytic activity. In addition, the doping of copper ions on the surface of the 3DOM Cu-CZ catalyst can improve the activity of the catalyst and it can get trapped by CO to form Cu + -CO, which plays an important role in the NO + CO reaction at low temperature. The existence of oxygen vacancy at high temperature is beneficial to the activation of O 2 and the dissociation of NO in the process of CO oxidation. The reaction of NO + CO over 3DOM Cu-CZ catalyst follows LÀ H and EÀ R mechanism respectively.

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“…NOx-assisted soot oxidation is a simultaneous approach which involves NO to NO2 conversion and subsequent soot oxidation by the formed NO2 from the gas phase, at relatively low temperature [28]. Many works have investigated this reaction using noble metal catalysts, which are able to reduce the ignition temperature of soot oxidation (T10% -temperature when 10% of soot is combusted) down to 370 °C, depending on the operating conditions [28,[35][36][37][38]. However, no high NO2 yields of the soot oxidation reaction have been reported whereas a high proportion of NO2 is beneficial for further NOx elimination processes (for instance, NH3-SCR).…”

Section: Introductionmentioning

confidence: 99%

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Tran

Martinović

Ceretti

et al. 2020

Applied Catalysis A: General

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In the framework of nowadays challenges in the automotive catalysis, directed to the mitigation of pollution caused by the emissions of internal combustion engines, a series of LaAl1-xCoxO3 perovskites were investigated with the purpose of enhancing the oxidation of soot in the presence of NOx. Perovskite oxides LaAl1-xCoxO3 (x=0; 0.25; 0.5; 0.75 and 1) were synthesized by a solgel route and characterized by different methods: X-Ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), N2-sorption, O2/NOx-temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The perovskite oxides were tested as catalysts for NO oxidation in isothermal mode and for NOx-assisted soot oxidation in temperature programmed reaction. Structural results reveal that Co is well incorporated in the perovskite structure expanding the unit cell, and doping Co may result in the distortion of the BO6 octahedra of the general ABO3 perovskite structure. An increase in Co substitution with x up to 0.75 remarkably promotes the oxidation activity, whereas total replacement of Al by Co degrades the catalytic performance. Among the prepared solids, LaAl0.25Co0.75O3 is the most active for NO oxidation, with a conversion of 78% at 320 °C, and it also exhibits the highest activity for NOxassisted soot oxidation, with a T10% of 377 °C while maintaining high NO2 production (71%). The outstanding performance of LaAl0.25Co0.75O3 is associated with the high mobility of lattice oxygen species and the role of surface adsorbed oxygen seems not to be prominent. The strong correlation of catalytic activity with NOx-TPD profiles suggests that NOx adsorption on catalyst surface is an essential step in soot oxidation. It is also shown that higher calcination temperature promotes the crystallinity of perovskite phase and leads to the improvement in the catalytic activity. The present work indicates that the prepared perovskite catalysts are competitive with noble-metal rivals for NOx-assisted soot oxidation and outperform them in NO2 production for further NOx abatement.

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Activity and thermal stability of Pt/Ce0.64Mn0.16R0.2Ox (R=Al, Zr, La, or Y) for soot and NO oxidation

Cited by 40 publications

References 41 publications

Design structure for CePr mixed oxide catalysts in soot combustion

Design structure for CePr mixed oxide catalysts in soot combustion

Activity Test and Mechanism Study of 3DOM Ce_0.8M_0.1Zr_0.1O₂ (M=Cr, Sn, Fe, Co, Ni, Mn, Cu) Catalyst in the Selective Catalytic Reduction of NO by CO**

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

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Activity and thermal stability of Pt/Ce0.64Mn0.16R0.2Ox (R=Al, Zr, La, or Y) for soot and NO oxidation

Cited by 40 publications

References 41 publications

Design structure for CePr mixed oxide catalysts in soot combustion

Design structure for CePr mixed oxide catalysts in soot combustion

Activity Test and Mechanism Study of 3DOM Ce0.8M0.1Zr0.1O2 (M=Cr, Sn, Fe, Co, Ni, Mn, Cu) Catalyst in the Selective Catalytic Reduction of NO by CO**

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

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Activity Test and Mechanism Study of 3DOM Ce_0.8M_0.1Zr_0.1O₂ (M=Cr, Sn, Fe, Co, Ni, Mn, Cu) Catalyst in the Selective Catalytic Reduction of NO by CO**