Active Component Migration and Catalytic Properties of Nitrogen Modified Composite Catalytic Materials

Li, Miaomiao; Peng, Gui; Zheng, Luning; Li, Jiaang; Xue, Gang; Liang, Jinsheng

doi:10.3390/catal8040125

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…Elements like Ca and Mg are often used as promoters, while Ce and Mn are doped to obtain oxygen vacancies ( Pecchi et al, 2011 ; Chen Y. L. et al, 2021 ). N is a commonly used dopant in non-metal doping, which can create more lattice distortions and further increase active oxygen species ( Buchneva et al, 2012 ; Li et al, 2018 ).…”

Section: Reaction Fundamentalsmentioning

confidence: 99%

Recent progress of catalytic methane combustion over transition metal oxide catalysts

et al. 2022

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Methane (CH4) is one of the cleanest fossil fuel resources and is playing an increasingly indispensable role in our way to carbon neutrality, by providing less carbon-intensive heat and electricity worldwide. On the other hand, the atmospheric concentration of CH4 has raced past 1,900 ppb in 2021, almost triple its pre-industrial levels. As a greenhouse gas at least 86 times as potent as carbon dioxide (CO2) over 20 years, CH4 is becoming a major threat to the global goal of deviating Earth temperature from the +2°C scenario. Consequently, all CH4-powered facilities must be strictly coupled with remediation plans for unburned CH4 in the exhaust to avoid further exacerbating the environmental stress, among which catalytic CH4 combustion (CMC) is one of the most effective strategies to solve this issue. Most current CMC catalysts are noble-metal-based owing to their outstanding C–H bond activation capability, while their high cost and poor thermal stability have driven the search for alternative options, among which transition metal oxide (TMO) catalysts have attracted extensive attention due to their Earth abundance, high thermal stability, variable oxidation states, rich acidic and basic sites, etc. To date, many TMO catalysts have shown comparable catalytic performance with that of noble metals, while their fundamental reaction mechanisms are explored to a much less extent and remain to be controversial, which hinders the further optimization of the TMO catalytic systems. Therefore, in this review, we provide a systematic compilation of the recent research advances in TMO-based CMC reactions, together with their detailed reaction mechanisms. We start with introducing the scientific fundamentals of the CMC reaction itself as well as the unique and desirable features of TMOs applied in CMC, followed by a detailed introduction of four different kinetic reaction models proposed for the reactions. Next, we categorize the TMOs of interests into single and hybrid systems, summarizing their specific morphology characterization, catalytic performance, kinetic properties, with special emphasis on the reaction mechanisms and interfacial properties. Finally, we conclude the review with a summary and outlook on the TMOs for practical CMC applications. In addition, we also further prospect the enormous potentials of TMOs in producing value-added chemicals beyond combustion, such as direct partial oxidation to methanol.

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Section: Reaction Fundamentalsmentioning

confidence: 99%

Recent progress of catalytic methane combustion over transition metal oxide catalysts

et al. 2022

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“…Banerjee et al [15] compared the relative efficiencies of Pd/alumina catalysts prepared by the vortex and incipient wetness methods. The catalyst synthesized by the vortex method produced smaller PdO/PdOx nanoparticles (2-5 nm) and converted 90% methane at 325 • C. Li et al [16] reported nitrogen-modified perovskite type composite catalysts prepared by a hydrothermal method for catalytic oxidation of methane. The surface reaction mechanism was investigated using in-situ diffuse reflectance infrared Fourier transform spectroscopy.…”

Section: The Special Issuementioning

confidence: 99%

Catalytic Oxidation of Methane

Banerjee

2021

Catalysts

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“…A Pd/Ceria nanocatalyst on Al 2 O 3 support was prepared by solution combustion method with 90% methane conversion at 400 • C [13]. A nanozeolite silicalite-1 coated cordierite catalyst and a nitrogen-modified perovskite-type composite catalyst eliminated 90% methane at 350 • C [14,15]. A Pd/Co 3 O 4 catalyst on ZrO 2 open cell foam converted about 90% methane at 325 • C and 100% at 400 • C [16].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Characteristics and Activities of Pd/γ-Al2O3 Catalysts Prepared by Vortex and Incipient Wetness Methods

et al. 2019

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5 wt% Pd/γ-Al2O3 catalysts were prepared by a modified Vortex Method (5-Pd-VM) and Incipient Wetness Method (5-Pd-IWM), and characterized by various techniques (Inductively coupled plasma atomic emission spectroscopy (ICP-AES), N2-physisorption, pulse CO chemisorption, temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray diffraction (XRD)) under identical conditions. Both catalysts had similar particle sizes and dispersions; the 5-Pd-VM catalyst had 0.5 wt% more Pd loading (4.6 wt%). The surfaces of both catalysts contained PdO and PdOx with about 7% more PdOx in 5-Pd-VM. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and scanning electron microscope (SEM) images indicated presence of PdO/PdOx nanocrystals (8–10 nm) on the surface of the support. Size distribution by STEM showed presence of smaller nanoparticles (2–5 nm) in 5-Pd-VM. This catalyst was more active in the lower temperature range of 275–325 °C and converted 90% methane at 325 °C. The 5-Pd-VM catalyst was also very stable after 72-hour stability test at 350 °C showing 100% methane conversion, and was relatively resistant to steam deactivation. Hydrogen TPR of 5-Pd-VM gave a reduction peak at 325 °C indicating weaker interactions of the oxidized Pd species with the support. It is hypothesized that smaller particle sizes, uniform particle distribution, and weaker PdO/PdOx interactions with the support may contribute to the higher activity in 5-Pd-VM.

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Active Component Migration and Catalytic Properties of Nitrogen Modified Composite Catalytic Materials

Cited by 8 publications

References 36 publications

Recent progress of catalytic methane combustion over transition metal oxide catalysts

Recent progress of catalytic methane combustion over transition metal oxide catalysts

Catalytic Oxidation of Methane

Comparative Study of the Characteristics and Activities of Pd/γ-Al2O3 Catalysts Prepared by Vortex and Incipient Wetness Methods

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