Effect of A-site substitution on the simultaneous catalytic removal of NO<sub>x</sub> and soot by LaMnO<sub>3</sub> perovskites

Zhao, Hongbin; Sun, Lvesheng; Fu, Maochen; Mao, Lei; Zhao, Xuteng; Zhang, Xin; Xiao, Youhong

doi:10.1039/c9nj01444f

Cited by 25 publications

(15 citation statements)

References 49 publications

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“…In fact, the comparison between NO 2 emission profiles during NO x -TPR experiments (Figure 10) and the corresponding profiles during soot oxidation in NO x -TPR conditions (Figure 12) confirms that the soot oxidation process is carried out by NO 2 reduction, being the difference between profiles the fraction of NO 2 consumed. Finally, as it is expected for manganese-based perovskites [58][59][60], all the catalysts show a high CO 2 selectivity (above 95%) during the NO x -TPR experiment. The electronic configuration of manganese as Mn(III) (d 4 ) is optimal to interact with CO molecules and due to the lability of Mn(IV)-O bond, the CO oxidation is complete at rather low temperatures [49].…”

Section: No X -Assisted Diesel Soot Oxidationsupporting

confidence: 72%

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

2022

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A series of BaMnO3 solids (BM-CX) were prepared by a modified sol-gel method in which a carbon black (VULCAN XC-72R), and different calcination temperatures (600 °C–850 °C) were used. The fresh and used catalysts were characterized by ICP-OES, XRD, XPS, FESEM, TEM, O2-TPD and H2- TPR-. The characterization results indicate that the use of low calcination temperatures in the presence of carbon black allows decreasing the sintering effects and achieving some improvements regarding BM reference catalyst: (i) smaller average crystal and particles size, (ii) a slight increase in the BET surface area, (iii) a decrease in the macropores diameter range and, (iv) a lower temperature for the reduction of manganese. The hydrogen consumption confirms Mn(III) and Mn(IV) are presented in the samples, Mn(III) being the main oxidation state. The BM-CX catalysts series shows an improved catalytic performance regarding BM reference catalyst for oxidation processes (NO to NO2 and NO2-assisted soot oxidation), promoting higher stability and higher CO2 selectivity. BM-C700 shows the best catalytic performance, i.e., the highest thermal stability and a high initial soot oxidation rate, which decreases the accumulation of soot during the soot oxidation and, consequently, minimizes the catalyst deactivation.

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Section: No X -Assisted Diesel Soot Oxidationsupporting

confidence: 72%

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

2022

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“…In Figure D, the Mn 2p 3/2 and 2p 1/2 peaks for YCMO are positioned at 642.5 and 653.9 eV, respectively, which are consistent not only with the presence of Mn 4+ but also with the coexistence of 2 + oxidation states that have been previously observed for Co . Analogous YNMO samples exhibit comparable peaks, corresponding to Mn 4+ species, which are similar in position, in addition to extra peaks located at 641.7 and 652.9 eV, that can be ascribed to the presence of Mn 3+ ; − this set of results implies the presence of mixed oxidation states for both Mn and Ni. Specifically, the pristine YNMO sample consists of a combination of approximately 75% Mn 4+ /Ni 2+ and 25% Mn 3+ /Ni 3+ species.…”

Section: Characterization Of Electrocatalystssupporting

confidence: 84%

Yttrium-based Double Perovskite Nanorods for Electrocatalysis

McGuire

Wesley

Sasaki

et al. 2022

ACS Appl. Mater. Interfaces

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Herein, we investigate the effect of the chemical composition of double perovskite nanorods on their versatile electrocatalytic activity not only as supports for the oxidation of small organic molecules but also as catalysts for the oxygen evolution reaction. Specifically, Y2CoMnO6 and Y2NiMnO6 nanorods with average diameters of 300 nm were prepared by a two-step hydrothermal method, in which the individual effects of synthetic parameters, such as the pH, annealing temperature, and precursor ratios on both the composition and morphology, were systematically investigated. When used as supports for Pt nanoparticles, Y2CoMnO6/Pt catalysts exhibited an electrocatalytic activity for the methanol oxidation reaction, which is 2.1 and 1.3 times higher than that measured for commercial Pt/C and Y2NiMnO6/Pt, respectively. Similarly, the Co-based catalyst support material displayed an ethanol oxidation activity, which is 2.3 times higher than both Pt/C and Y2NiMnO6/Pt. This clear enhancement in the activity for Y2CoMnO6 can largely be attributed to strong metal–support interactions, as evidenced by a downshift in the binding energy of the Pt 4f bands, measured by X-ray photoelectron spectroscopy (XPS), which is often correlated not only with a downshift in the d-band center but also to a decreased adsorption of poisoning adsorbates. Moreover, when used as catalysts for the oxygen evolution reaction, Y2CoMnO6 displayed a much greater activity as compared with Y2NiMnO6. This behavior can largely be attributed not only to a preponderance of comparatively more favorable oxidation states and electronic configurations but also to the formation of an active layer on the surface of the Y2CoMnO6 catalyst, which collectively gives rise to improved performance metrics and greater stability as compared with both IrO2 and Y2NiMnO6. Overall, these results highlight the importance of both the chemical composition and the electronic structure of double perovskites, especially when utilized in multifunctional roles as either supports or catalysts.

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“…Perovskite catalysts have received increasing interest over the past decades due to their cost-effective natures, good thermal stabilities, and flexible structures. The outstanding soot catalytic efficiencies of the perovskite-type catalysts have been demonstrated in the literature. , The theoretical studies revealed that B-site components dominate the catalyst performance for the perovskite structure (with general formula ABO 3 ), while A-site elements are critical to the catalyst’s structural behavior and catalytic activity. , Zhao et al investigated the simultaneous removing of NO x and soot over L 1– x M x MnO 3 (M = K, Sr, Pr with x = 0, 0.1, 0.2, 0.3). The K + , Sr 2+ , and Pr 3+ could successfully enter into the lattice that formed perovskite structures.…”

Section: Soot Oxidation Activity Over Manganese Oxide-based Catalystsmentioning

confidence: 99%

“…123,124 The theoretical studies revealed that B-site components dominate the catalyst performance for the perovskite structure (with general formula ABO 3 ), while A-site elements are critical to the catalyst's structural behavior and catalytic activity. 125,126 Zhao et al 96 investigated the simultaneous removing of NO x and soot over L 1−x M x MnO 3 (M = K, Sr, Pr with x = 0, 0.1, 0.2, 0.3). The K + , Sr 2+ , and Pr 3+ could successfully enter into the lattice that formed perovskite structures.…”

Section: Soot Oxidation Activity Over Manganese Oxide-based Catalystsmentioning

confidence: 99%

Manganese Oxide-Based Catalysts for Soot Oxidation: A Review on the Recent Advances and Future Directions

Khaskheli

Liu

2022

Energy Fuels

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Soot particles generated by combustion engines, such as gasoline direct injection engines (GDIs) and diesel engines, must be removed from the exhaust to meet the tightened emissions standards. The particulate filters with coated catalysts are common and successful techniques for the oxidation and removal of soot, during which the catalytic performance of the used catalyst plays a critical role. This review aims to discuss the soot oxidation behavior using manganese oxides as catalysts considering their beneficial natures of high catalytic oxidation activities, cost effectiveness, and environmental friendliness. This review begins with a brief discussion on how the various influential factors (e.g., soot composition, soot–catalyst mixing ratios, contact conditions, and gaseous reactions) could affect the soot catalyst activities. After that, a detailed introduction to various kinds of manganese oxide-based catalysts, including pure manganese oxides and types of perovskites, composites, and mixed, as well as manganese oxides decorated by nanoparticles or doped with metals, was provided, with the focus on the catalytic performances of each kind of catalyst and the catalytic mechanisms. The thermal stabilities of different manganese oxide-based catalysts were then briefly introduced. Finally, remarkable results and interesting findings were summarized, which are expected to provide valuable guidance for the synthesis, design, and performance optimization of manganese oxide-based catalysts for soot catalytic combustion.

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Effect of A-site substitution on the simultaneous catalytic removal of NO_x and soot by LaMnO₃ perovskites

Abstract: The simultaneous catalytic removal of NOx and soot by La1−xMxMnO3 (M = K, Sr, Pr; x = 0, 0.1, 0.2, 0.3) perovskites was investigated.

Cited by 25 publications

References 49 publications

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

Yttrium-based Double Perovskite Nanorods for Electrocatalysis

Manganese Oxide-Based Catalysts for Soot Oxidation: A Review on the Recent Advances and Future Directions

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Effect of A-site substitution on the simultaneous catalytic removal of NOx and soot by LaMnO3 perovskites

Abstract: The simultaneous catalytic removal of NOx and soot by La1−xMxMnO3 (M = K, Sr, Pr; x = 0, 0.1, 0.2, 0.3) perovskites was investigated.

Cited by 25 publications

References 49 publications

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

Yttrium-based Double Perovskite Nanorods for Electrocatalysis

Manganese Oxide-Based Catalysts for Soot Oxidation: A Review on the Recent Advances and Future Directions

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Effect of A-site substitution on the simultaneous catalytic removal of NO_x and soot by LaMnO₃ perovskites