Enhanced CO catalytic oxidation by Sr reconstruction on the surface of La x Sr 1− x CoO 3− δ

Wang, Xiyang; Huang, Keke; Qian, Jingyu; Cong, Yang; Ge, Chengda

doi:10.1016/j.scib.2017.03.017

Cited by 49 publications

(35 citation statements)

References 52 publications

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“…According to this analysis, the ratios of Co 3+ increase and of surface oxygen species decrease after the introduction of heteroatoms, leading to an enhanced ability to oxidize CO for the doped LaCoO 3 (Figure a). It is worth noting that the surface O species contribute to the performance of CO oxidation as reported in previous works, although the surface O species of perovskite were transformed into the Co 3 O 4 , and the binding energy of O 1s is almost the same as the lattice O of perovskite. The resultant cobalt oxide nanoparticles offer a higher catalytic activity and better crystallinity with abundance of lattice oxygen on the surface, despite with a sacrifice of lattice oxygen in the parent perovskite surface.…”

Section: Figurementioning

confidence: 93%

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

et al. 2017

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CO catalytic oxidation on the perovskite oxide LaCoO3, which can be ascribed to a decoration of Co3O4 nanoparticles on the surface, was achieved with 90 % conversion rate at 202 °C. The obtained dual‐phase catalyst was successfully synthesized through a non‐stoichiometric Ce‐induced exsolution‐like process, after an electrospinning treatment with subsequent annealing. The enhanced activity originates from the surface oxygen of LaCoO3/Co3O4 and Co3+ in the Co3O4 nanoparticles, as confirmed by X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption near‐edge structure analysis (XANES). The synergic effect of the surfaced Co3O4 and parent LaCoO3 may open a path to unlocking the activity of perovskite oxides for enhanced low‐temperature CO oxidation.

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Section: Figurementioning

confidence: 93%

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

et al. 2017

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“…The results of H 2 ‐TPR of perovskite catalysts are shown in Figure 7. Figure 7a shows that the catalysts have consumed H 2 after 125°C, which is mainly caused by the reduction of adsorbed oxygen on the surfaces of catalysts 24 . Due to the low loading amount, the H 2 consumption of 20LM/HZSM‐5 between 50°C and 150°C is not obvious.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7a shows that the catalysts have consumed H 2 after 125 C, which is mainly caused by the reduction of adsorbed oxygen on the surfaces of catalysts. 24 Due to the low loading amount, the H 2 consumption of 20LM/HZSM-5 between 50 C and 150 C is not obvious. According to the work of Tarjomannejad et al, 11 there are mainly two low-temperature signal peaks below 500 C and one high-temperature signal peak above 500 C in the H 2 -TPR profile of LaMnO 3 perovskite.…”

Section: Catalytic Activitymentioning

confidence: 99%

Investigation of LaMnO₃ catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation

Zhou

et al. 2021

Asia-Pacific J Chem Eng

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Due to the large amounts of CO pollutant from iron ore sintering and vehicle emissions, the control of CO emission becomes more and more important for the environment. To control the emission of CO more effectively, the catalysts of LaMnO3 perovskite with HZSM‐5 zeolite as support were prepared by sol–gel method. The structure and catalytic activities of catalysts were characterized and analyzed. According to the results of X‐ray diffraction (XRD) and energy‐dispersive X‐ray spectroscopy (EDS), the LaMnO3 perovskite phase is successfully obtained in all the supported catalysts. The average particle sizes of supported catalysts are in the range of 15–38 μm. Compared with the perovskite catalysts loaded on other kinds of supports, LaMnO3 supported with HZSM‐5 has a larger specific surface area (SSA). The SSAs of supported catalysts with different loading amount are in the range of 190–300 m2/g. The HZSM‐5 support improves the catalytic activity of LaMnO3 catalyst by increasing the SSA. The activity of supported catalyst becomes higher when the loading amount increases from 20% to 60%. The catalyst with 60% perovskite loaded shows the best activity in CO catalytic oxidation. The CO conversion of 60LM/HZSM‐5 attains 50% and 90% at 172.7°C and 201.5°C, respectively. The activities of catalysts with 80% and 100% perovskite loaded decrease due to the accumulated pores formed by too much perovskite. The supported catalysts exhibit favorable activities in consecutive reaction cycles. It turns out that HZSM‐5 support is appropriate for the synthesis of active perovskite catalysts for CO oxidation.

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“…As shown in Figure 4a,b, the O 1s spectrum is divided into four components, namely bulk O 2− (O lattice ) located at ≈528.7 eV, perovskite lattice termination at≈529.5 eV, surface oxygen species (O surface ) at ≈531.2 eV and surface adsorbed oxygen species (O surface ) at ≈533.6 eV. [39,40] Table 1 reveals that the surface oxygen/lattice oxygen ratio of B-LSM is 2.73, which is more than that of A-LSM (1.26), which indicates that the surface of B-LSM has absorbed more oxygen species, for example H 2 O and CO 2 . Moreover, as shown in Figure 4a,b, and Figure S17, Supporting Information, the O 1s XPS peak of B-LSM for the perovskite lattice termination also shifts to high energy, indicating the presence of more active lattice oxygen (O 2−x ) in B-LSM.…”

Section: Resultsmentioning

confidence: 99%

Manipulating Surface Termination of Perovskite Manganate for Oxygen Activation

Wang

Chu

et al. 2021

Adv Funct Materials

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For ABO 3 perovskite oxides, one of the key issues limiting their utilization in heterogeneous catalysis is the dominant presence of catalytically inactive A-site cations at the surface. The engineering of B-site terminated perovskites is considered as an effective method to address this issue, especially when dealing with Mn/Co-based perovskite catalysts. However, to date, such a strategy has not been fully successful and remains a major challenge in the field. Herein, a Mn-terminated La 0.45 Sr 0.45 MnO 3 (B-LSM) is successfully synthesized via a one-pot hydrothermal method, in which low-valence Mn ions partially occupy the A site to form the active Mn-excess phase. Experimental results and theoretical calculations reveal that the presence of the surface Mn termination in B-LSM optimizes the hybrid orbitals of Mn 3d-O 2p and promotes the activation of surface lattice oxygen, where the pristine inert lattice O 2− is evolved into active and stable lattice O 2−x . Such structural optimization significantly reduces the activation energy barriers on going from O 2 − species to important intermediate O − species during O 2 activation. Moreover, this results in good stability and Pt-like activity for the B-LSM during CO oxidation. This work offers a new chemical route for the design of advanced perovskite-type oxides possessing novel functions.

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Enhanced CO catalytic oxidation by Sr reconstruction on the surface of La x Sr 1− x CoO 3− δ

Cited by 49 publications

References 52 publications

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

Investigation of LaMnO₃ catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation

Manipulating Surface Termination of Perovskite Manganate for Oxygen Activation

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Enhanced CO catalytic oxidation by Sr reconstruction on the surface of La x Sr 1− x CoO 3− δ

Cited by 49 publications

References 52 publications

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co3O4/LaCoO3 at Lower Temperature

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co3O4/LaCoO3 at Lower Temperature

Investigation of LaMnO3 catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation

Manipulating Surface Termination of Perovskite Manganate for Oxygen Activation

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Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co₃O₄/LaCoO₃ at Lower Temperature

Investigation of LaMnO₃ catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation