Activity and Stability of Cu‐Based Spinel‐Type Complex Oxides for Diesel Soot Combustion

Zhang, Fei; Zhu, Xinbo; Wu, Hanpeng; Wu, Xiqiang; Zhou, Zijian; Chen, Geng; Yang, Guohua

doi:10.1002/slct.202102899

Cited by 9 publications

(9 citation statements)

References 66 publications

(69 reference statements)

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“…The peaks at 406.3 eV and 401.2 eV can be regarded as nitrate and the oxidation state of NO − , NO 2 − and NO 2 [50,51] . The percentage content of Mn 4+ on the catalyst surface also increases from 35.93 % to 39.66 % and the O lat content only reduces by 3.33 % in the presence of 500 ppm NO, suggesting that NO would be chemisorbed on the surface of OMS‐2‐H120, which promotes the mercury oxidation by forming the oxidizing substance and reducing the consumption of O lat [52] . In addition, a peak at 1384 cm −1 assigned as nitrito monodentate species (ν NO 2 − ) is appeared in Figure 7 [53] .…”

Section: Resultsmentioning

confidence: 98%

“…[50,51] The percentage content of Mn 4 + on the catalyst surface also increases from 35.93 % to 39.66 % and the O lat content only reduces by 3.33 % in the presence of 500 ppm NO, suggesting that NO would be chemisorbed on the surface of OMS-2-H120, which promotes the mercury oxidation by forming the oxidizing substance and reducing the consumption of O lat . [52] In addition, a peak at 1384 cm À 1 assigned as nitrito monodentate species (ν NO 2 À ) is appeared in Figure 7. [53] The existence of NO and O 2 in the flue gas would lead to the formation of the active species such as NO 2 , NO 2 À and NO À on the catalyst surface, [54] accelerating the oxidation of Hg 0 and formed Hg (NO 3 ) 2 or HgO, which could be interpreted by the following reactions:…”

Section: Effect Of O 2 On Hg 0 Oxidationmentioning

confidence: 98%

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One‐Pot Hydrothermal Synthesis for a Manganese Oxide Molecular Sieve for Application in Mercury Removal in Chloride‐Free Flue Gas

et al. 2022

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OMS‐2 (manganese oxide octahedral molecular sieve) were prepared by one pot hydrothermal method under different temperatures in this work, and their performances of oxidizing elemental mercury (Hg0) in the flue gas derived from coal combustion were evaluated. Moreover, the effects of the reaction temperature and flue gas component on Hg0 oxidation ability of these catalysts were also investigated. It is found that OMS‐2 catalysts have an excellent mercury oxidizing ability under 100–200 °C, and 94 % Hg0 oxidation efficiency could be achieved by catalyst prepared under 120 °C (OMS‐2‐H120) in the chlorine free flue gas. The process of elemental mercury oxidation over OMS‐2‐H120 by O2 is found to follow Mars‐Maessen mechanism based on the XPS and FTIR analysis of the fresh and spent catalysts. NO is the precursors of the active species such as NO−, NO2, which is benefit to improve Hg0 oxidation ability of OMS‐2‐H120. SO2 have a negative effect on Hg0 oxidation over OMS‐2‐H120 while water vapor exhibits nearly no influence.

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Section: Resultsmentioning

confidence: 98%

Section: Effect Of O 2 On Hg 0 Oxidationmentioning

confidence: 98%

One‐Pot Hydrothermal Synthesis for a Manganese Oxide Molecular Sieve for Application in Mercury Removal in Chloride‐Free Flue Gas

et al. 2022

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“…The O 1s spectra could be deconvoluted into two major peaks. The peaks around 531.3 eV corresponded to the surface-adsorbed oxygen (O ads ), while the peaks around 529.6 eV could be ascribed to lattice oxygen (O latt ) species [27]. The relative concentrations of O ads /(O ads +O latt ) over the four catalysts are listed in Table 1.…”

Section: Textural Properties Of Mn-x/γ-al 2 O 3 Catalystsmentioning

confidence: 99%

Soot Oxidation over γ-Al2O3-Supported Manganese-Based Binary Catalyst in a Dielectric Barrier Discharge Reactor

Zhu

Liu

et al. 2022

Catalysts

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In this work, soot oxidation was conducted over a series of Mn-X/γ-Al2O3 (M = Ce, Co and Cu) binary catalysts in a dielectric barrier discharge reactor. The soot conversion in the plasma–catalytic system was in the order of Mn/γ-Al2O3 (57.7%) > Mn-Co/γ-Al2O3 (53.9%) > Mn-Ce/γ-Al2O3 (51.6%) > Mn-Cu/γ-Al2O3 (47.7%) during the 30 min soot oxidation process at 14 W and 150 °C. Meanwhile, the doping of Ce, Co and Cu slightly improved the CO2 selectivity of the process by 4.7% to 10.3% compared to soot oxidation over Mn/γ-Al2O3.It is worth to note that the order of CO2 selectivity was in the opposite order with soot oxidation rate. The effects of discharge power, oxygen content in the carrier gas and reaction temperature on plasma–catalytic soot oxidation was systematically analyzed. The catalyst characterizations, including N2 adsorption–desorption, X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction by H2 and temperature-programmed desorption of O2, were conducted to illustrate the reaction mechanisms of plasma–catalytic soot oxidation and reaction pathways.

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“…Jampaiah et al found that a CuCo-MnO 2 catalyst exhibited a lower T 90 temperature (485 °C) of catalytic soot combustion than that of NiCo-MnO 2 catalysts (513 °C) under the loose contact mode due to more oxygen vacancies and active sites on the catalyst surfaces [ 11 ]. Zhang et al tested the stability of CuCo 2 O 4 spinel catalysts in four consecutive soot combustion cycles and found that the values of T 50 for catalytic soot combustion increased from 539 °C to 544 °C, 547 °C and 549 °C, respectively [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Soot Combustion over Cu–Co Spinel Catalysts: The Intrinsic Effects of Precursors on Catalytic Activity

Zhou

Zhu

Zhang

et al. 2022

IJERPH

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In this work, a series of CuCo2O4-x (x = N, A and C) catalysts were synthesized using different metal salt precursors by urea hydrothermal method for catalytic soot combustion. The effect of CuCo2O4-x catalysts on soot conversion and CO2 selectivity in both loose and tight contact mode was investigated. The CuCo2O4-N catalyst exhibited outstanding catalytic activity with the characteristic temperatures (T10, T50 and T90) of 451 °C, 520 °C and 558 °C, respectively, while the CO2 selectivity reached 98.8% during the reaction. With the addition of NO, the soot combustion was further accelerated over all catalysts. Compared with the loose contact mode, the soot conversion was improved in the tight contact mode. The CuCo2O4-N catalysts showed better textural properties compared to the CuCo2O4-A and CuCo2O4-C, such as higher specific surface areas and pore volumes. The XRD results confirmed that the formation of a CuCo2O4 crystal phase in all catalysts. However, the CuO crystal phase only presented in CuCo2O4-N and CuCo2O4-A. The relative contents of Cu2+, Co3+ and Oads on the surface of CuCo2O4-x (x = N, A and C) catalysts were analyzed by XPS. The CuCo2O4-N catalyst displayed the highest relative content of Cu2+, Co3+ and Oads. The activity of catalytic soot combustion showed a good correlation with the order of the relative contents of Cu2+, Co3+ and Oads. Additionally, the CuCo2O4-N catalyst exhibited lower reduction temperature compared to the CuCo2O4-A and CuCo2O4-C. The cycle tests clarified that the copper–cobalt spinel catalyst obtained good stability. In addition, based on the Mars–van Krevelen mechanism, the process of catalytic soot combustion was described combined with the electron transfer process and the role of oxygen species over CuCo2O4 spinel catalysts.

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Activity and Stability of Cu‐Based Spinel‐Type Complex Oxides for Diesel Soot Combustion

Cited by 9 publications

References 66 publications

One‐Pot Hydrothermal Synthesis for a Manganese Oxide Molecular Sieve for Application in Mercury Removal in Chloride‐Free Flue Gas

One‐Pot Hydrothermal Synthesis for a Manganese Oxide Molecular Sieve for Application in Mercury Removal in Chloride‐Free Flue Gas

Soot Oxidation over γ-Al2O3-Supported Manganese-Based Binary Catalyst in a Dielectric Barrier Discharge Reactor

Soot Combustion over Cu–Co Spinel Catalysts: The Intrinsic Effects of Precursors on Catalytic Activity

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