Synergistic catalysis effect of Mn-promoted BaAl2O4 catalysts on catalytic performance for soot combustion

Yang, Gaoyang; Li, Yingjie; Men, Yongfeng

doi:10.1016/j.catcom.2015.06.020

Cited by 24 publications

(14 citation statements)

References 25 publications

(23 reference statements)

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“…As the temperature increases, the band intensity for above nitrites species declines gradually and disappears at 300 °C with simultaneous forming of trace nitrates, including monodentate nitrates (1082, 1432 cm −1 ) and bidentate nitrates (1318, 1543 cm −1 ) [9,41], which are extremely stable at high temperatures. Considering the NO-TPO results, the trend of NO 2 production correlates well with that of the IR intensity of nitrites versus temperature, which well illustrates that the NO 2 involved in the oxidation of soot originates from the decomposition of nitrites due to inferior thermostability.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Wang

Cui

et al. 2018

Materials

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A novel active Ca-Co dually-doping pyrochlore oxide La2−xCaxSn2−yCoyO7 catalyst was synthesized by the sol-gel method for catalytic oxidation of soot particulates. The microstructure, atomic valence, reduction, and adsorption performance were investigated by X-ray powder diffraction (XRD), scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), H2-TPR (temperature-programmed reduction), and in situ diffuse reflection infrared Fourier transformed (DRIFTS) techniques. Temperature programmed oxidation (TPO) tests were performed with the mixture of soot-catalyst under tight contact conditions to evaluate the catalytic activity for soot combustion. Synergetic effect between Ca and Co improved the structure and redox properties of the solids, increased the surface oxygen vacancies, and provided a suitable electropositivity for oxide, directly resulting in the decreased ignition temperature for catalyzed soot oxidation as low as 317 °C. The presence of NO in O2 further promoted soot oxidation over the catalysts with the ignition temperature decreased to about 300 °C. The DRIFTS results reveal that decomposition of less stable surface nitrites may account for NO2 formation in the ignition period of soot combustion, which thus participate in the auxiliary combustion process.

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Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Wang

Cui

et al. 2018

Materials

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“…Mothudi et al [35] also reported the same impurity peaks when they prepared BaAl 2 O 4 using a combustion method. It has been reported in the literature that the temperature required for the synthesis of BaAl 2 O 4 is within the range of 900-1300 • C [12,17,18]. It is worth mentioning that the hexagonal phase of BaAl 2 O 4 was obtained even at a 500 • C furnace temperature.…”

Section: Introductionmentioning

confidence: 91%

“…Among these aluminates, barium aluminate (BaAl 2 O 4 ) is a material that is widely applied in the field of electronics for devices such as cathode-ray tubes, fieldemission displays, plasma display panels and fibre amplifiers [7][8][9][10]. Furthermore, BaAl 2 O 4 is a high-temperature-resistant material with sound ferroelectric and catalytic properties and hence creating its technological importance [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Singh

Sivaramaiah²,

Singh

et al. 2019

Bull Mater Sci

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A BaAl 2 O 4 :Gd 3+ phosphor was successfully prepared using a combustion technique. An X-ray diffraction pattern was used to characterize the resultant phosphor, and the photoluminescence (PL) of the prepared BaAl 2 O 4 :Gd 3+ was studied. Under a 273-nm excitation, the main emission peak of the phosphor is located at 314 nm, and this is attributed to the 6 P 7/2 → 8 S 7/2 transition of Gd 3+. Electron paramagnetic resonance (EPR) spectrum appears to be U-shaped, and lines are evident at g eff ∼ 2.14, 4.56 and 6.75. The PL and EPR analyses indicate the presence of Gd as Gd 3+ in this sample.

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“…It is eye catching that T 50 of CSS and MCSS decreases by 27 and 59 °C, respectively, yet increases by 11 °C for MSS. NO can advance soot combustion via forming highly active NO 2 or nitrate/nitrite. ,,, For CSS, NO 2 has been reported to be the active species . In order to explore the astonishing effect of NO on MCSS and MSS, NO-TPO was performed, as shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Promoting Diesel Soot Combustion Efficiency over Hierarchical Brushlike α-MnO₂ and Co₃O₄ Nanoarrays by Improving Reaction Sites

Chen

et al. 2019

Ind. Eng. Chem. Res.

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Improving the accessible reaction sites of catalysts is vital to diesel soot elimination. Herein, hierarchical brushlike α-MnO 2 and Co 3 O 4 nanoarrays were in situ grown on AISI304 stainless steel wire-mesh via a two-step hydrothermal method. Morphology investigation displayed that compared with sole α-MnO 2 or Co 3 O 4 nanoarrays, α-MnO 2 and Co 3 O 4 nanoarrays provided 8-fold reaction sites. XRD, Raman spectroscopy, XPS, H 2 -TPR, and soot-TPR techniques proved the synergistic effect between cobalt and manganese, namely, weaker Mn−O bonds, more surface active oxygen species, and better redox ability. Kinetic data also showed that the activation energy was decreased, and the pre-exponential factor was increased. α-MnO 2 and Co 3 O 4 nanoarrays displayed superior catalytic performance (T 50 = 354 °C, T 90 = 395 °C), durability, and isothermal regeneration activity. In a simulated diesel exhaust at 400 °C, 90% of soot would be eliminated at 12 min, and the regeneration would be finished within 30 min. Finally, the catalyst coating was tightly anchored on the substrate without exfoliation or crazing.

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Synergistic catalysis effect of Mn-promoted BaAl2O4 catalysts on catalytic performance for soot combustion

Cited by 24 publications

References 25 publications

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Promoting Diesel Soot Combustion Efficiency over Hierarchical Brushlike α-MnO₂ and Co₃O₄ Nanoarrays by Improving Reaction Sites

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Synergistic catalysis effect of Mn-promoted BaAl2O4 catalysts on catalytic performance for soot combustion

Cited by 24 publications

References 25 publications

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Promoting Diesel Soot Combustion Efficiency over Hierarchical Brushlike α-MnO2 and Co3O4 Nanoarrays by Improving Reaction Sites

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Promoting Diesel Soot Combustion Efficiency over Hierarchical Brushlike α-MnO₂ and Co₃O₄ Nanoarrays by Improving Reaction Sites