In-Depth Understanding of the Morphology Effect of α-Fe₂O₃ on Catalytic Ethane Destruction

Abstract

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Flame In Situ Synthesis of Metal-Anchored CuO Nanowires for CO Catalytic Oxidation and Kinetic Analysis

“…The TPR pattern of the bimetallic catalyst shows that the bimetallic combination (218 °C) is reduced at lower temperatures than the Fe-Cu catalyst (223 °C), indicating that the introduced cerium improves the intrinsic reducibility of the Fe-Cu catalyst. Likewise, in iron-containing catalysts, the weak package at 300–400 °C is ascribed to the reduction of Fe 2 O 3 , and the profiles show that the interaction between Ce–O–Fe lowers the reduction temperature of Fe 2 O 3 (366 °C → 336 °C) . The O 2 -TPD profiles in Figure b reveal that the desorption peaks from 50 to 200 °C are assigned to surface oxygen species, which are physisorbed oxygen (below 100 °C) and chemisorbed oxygen (100–200 °C), respectively.…”

“…Raman spectra are illustrated in Figure b, and the characteristic Raman peaks of metal oxide phases in catalysts are listed in Table S3. In particular, the peaks centered at 452, 600, and 690 cm –1 are related to the F 2g symmetric vibration (CeOCe stretching), oxygen vacancy and the T vibration of Fe 2 O 3 , and the I D / I F2g of CeO 2 and the T value of Fe 2 O 3 obtained by Raman analysis can indicate the level of oxygen vacancies and surface lattice defect sites. , The I D / I F2g of the CeFe-Cu catalyst (0.34%) is higher than that of Ce-Cu (0.22%), and its T value (6.14) is also higher than that of Fe-Cu (4.69) (Table ), demonstrating that the dispersion of binary metal oxides on the surface of copper oxides can create more surface oxygen sites and defects, which facilitate the deep oxidation of CO …”

Selective oxidation of CH4 to CH3OH through plasma catalysis: Insights from catalyst characterization and chemical kinetics modelling

“…The O 1s spectra of NiO/γ-Al2O3 catalysts presented in Figure 5 B can be fitted into three peaks, corresponding to the lattice oxygen of metal oxide (Oα), chemisorbed oxygen (Oβ), and adsorbed water or OH species (Oλ), with binding energy at 530.9 eV, 532.1 eV and 532.9 eV, respectively. [47,48] As shown in Figure 5 C, upon increasing Ni loading from 2 to 10 wt.%, the proportion of Oβ species on the catalyst surface rises, and reaches the highest value (45.6%) at 10 wt.% loading, and then it decreases. Interestingly, the variation trend of Ni 2p peak of SOSI NiO (Figure 5 A) is synchronous with O 1s of Oβ species, which means that the chemisorbed oxygen, i.e., Oβ species, mainly comes from the SOSI NiO.…”

Biogenic Pt/CaCO3 Nanocomposite as a Robust Catalyst toward Benzene Oxidation

“…At present, air pollution purification has received extensive research and become one of the public concerns. Volatile organic compounds (VOCs) with the properties of volatility, toxicity, and diffusivity pose a serious threat to human health and the environment. − Therefore, the abatement of VOCs has attracted numerous concerns in recent years. Catalytic oxidation technology is a desired approach for efficient degradation of VOCs among biological, chemical, as well as physical techniques, where it can be operated at lower reaction temperatures with high efficiency and relatively low cost. − The availability of catalysts is critical to the efficient removal in the catalytic oxidation method.…”