One-pot synthesis of dual-phase manganese dioxide for toluene removal: Effect of crystal phase blending level on oxygen species and activity

Liu, Lizhong; Liu, Jingyin; Guo, Mingming

doi:10.1016/j.jece.2022.107448

Cited by 7 publications

(5 citation statements)

References 55 publications

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“…The N 2 adsorption–desorption isotherms of LaCoO 3 , SmCoO 3 , and GdCoO 3 catalysts are presented in Figure S2. The isotherms for all samples exhibit a typical Type II pattern, as per the IUPAC classification, characterized by slit-type pores (H3 type) in the BET hysteresis loop. − The specific surface areas of these catalysts were determined by using the Brunauer–Emmett–Teller (BET) model. As shown in Table , the specific surface areas of LaCoO 3 , SmCoO 3 , and GdCoO 3 are relatively low, measuring 29.4, 25.6, and 24.8 m 2 ·g –1 , respectively (Table ).…”

Section: Resultsmentioning

confidence: 99%

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Liu,

Zhu,

Zhang

et al. 2023

Inorg. Chem.

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Various Co-based perovskites are synthesized through thermally driving viscous fluids. In this process, rare earth salts, cobalt salts, and citric acid do not require homogeneous mixing but only need to be heated until they melt into a molten viscous slurry. The physicochemical properties of cobalt-based perovskites were examined using techniques such as X-ray diffraction (XRD), electron paramagnetic resonance (EPR), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-Mapping-EDS), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2 -TPR), oxygen temperature-programmed desorption (O 2 -TPD), and N 2 adsorption−desorption. The results indicate that the surface-active species can be controlled by altering the A-site elements of cobalt-based perovskites. All catalysts synthesized through the thermal treatment of viscous mixtures exhibited a low activation temperature and a low apparent activation energy for the catalytic oxidation of toluene. Among all cobalt-based perovskites, LaCoO 3 demonstrated the most outstanding catalytic activity, primarily attributed to its capacity to expose a larger number of surface-active sites and oxygen species, as well as its superior reducibility. Furthermore, the formation process of optimal LaCoO 3 was monitored using thermogravimetric analysis-differential scanning calorimetry (TGA-DSC), and the byproducts of the low-temperature catalytic oxidation of toluene by the catalyst were identified using gas chromatography−mass spectrometry (GC−MS). The possible mechanism of toluene oxidation was inferred by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS). Moreover, LaCoO 3 exhibits a predominant resistance to high-temperature hydrothermal conditions. This work provides a scalable and innovative approach to fabricating exceptionally effective catalysts for the efficient purification of VOCs.

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Section: Resultsmentioning

confidence: 99%

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Liu,

Zhu,

Zhang

et al. 2023

Inorg. Chem.

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“…43 While in the O 1s spectrum of manganese oxide coated BaTiO 3 sample, an additional peak appears at the binding energy of 529.6 eV corresponding to the Mn–O–Mn environment of oxygen, confirming the presence of manganese oxide. 42…”

Section: Resultsmentioning

confidence: 99%

“…and Mn 4+ oxidation states (refers to MnO, Mn 2 O 3 and MnO 2 , respectively), with a clear dominance of Mn 2+ state in the manganese oxide coated BaTiO 3 sample. 42 For the uncoated BaTiO 3 sample, the O 1s spectrum consists of two peaks at the binding energy of 529.2 and 530.5…”

Section: Dalton Transactions Accepted Manuscriptmentioning

confidence: 99%

“…41 The deconvolution of the Mn 2p core spectrum presented three characteristic peaks for each Mn 2p 3/2 and Mn 2p 1/2 associated with Mn 2+ , Mn 3+ and Mn 4+ oxidation states (refers to MnO, Mn 2 O 3 and MnO 2 , respectively), with a clear dominance of Mn 2+ state in the manganese oxide coated BaTiO 3 sample. 42 For the uncoated BaTiO 3 sample, the O 1s spectrum consists of two peaks at the binding energy of 529.2 and 530.5 eV, corresponding to the lattice oxygen in BaTiO 3 and the oxygen in the surface hydroxyl and aryloxide defects, respectively. 43 While in the O 1s spectrum of manganese oxide coated BaTiO 3 sample, an additional peak appears at the binding energy of 529.6 eV corresponding to the Mn-O-Mn environment of oxygen, confirming the presence of manganese oxide.…”

Section: Microstructure Morphology and Electrochemistry Of Batio 3 Mo...mentioning

confidence: 99%

“…43 While in the O 1s spectrum of manganese oxide coated BaTiO 3 sample, an additional peak appears at the binding energy of 529.6 eV corresponding to the Mn-O-Mn environment of oxygen, confirming the presence of manganese oxide. 42 The temperature dependence of resistivity (PTCR effect) for the uncoated and manganese oxide coated BaTiO 3 samples are presented in Fig. 9.…”

Section: Microstructure Morphology and Electrochemistry Of Batio 3 Mo...mentioning

confidence: 99%

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Solvothermal synthesis of nanoscale BaTiO₃ in benzyl alcohol–water mixtures and effects of manganese oxide coating to enhance the PTCR effect

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One-pot synthesis of dual-phase manganese dioxide for toluene removal: Effect of crystal phase blending level on oxygen species and activity

Cited by 7 publications

References 55 publications

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Solvothermal synthesis of nanoscale BaTiO₃ in benzyl alcohol–water mixtures and effects of manganese oxide coating to enhance the PTCR effect

Boosting the Catalytic Performance of γ-MnOOH Through Post-Treatment with Potassium Hydroxide on n-Butylamine with CO2

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One-pot synthesis of dual-phase manganese dioxide for toluene removal: Effect of crystal phase blending level on oxygen species and activity

Cited by 7 publications

References 55 publications

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Thermally Inducing Viscous Fluids to Generate Co-Based Perovskites Enriched with Active Species for the Removal of VOCs

Solvothermal synthesis of nanoscale BaTiO3 in benzyl alcohol–water mixtures and effects of manganese oxide coating to enhance the PTCR effect

Boosting the Catalytic Performance of γ-MnOOH Through Post-Treatment with Potassium Hydroxide on n-Butylamine with CO2

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Solvothermal synthesis of nanoscale BaTiO₃ in benzyl alcohol–water mixtures and effects of manganese oxide coating to enhance the PTCR effect