Identifying properties of low-loaded CoOX/CeO2 via X-ray absorption spectroscopy for NO reduction by CO

Savereide, Louisa; Gosavi, Abha; Hicks, Kenton E.; Notestein, Justin M.

doi:10.1016/j.jcat.2019.11.016

Cited by 18 publications

(4 citation statements)

References 39 publications

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“…The catalyst activity of cerium oxide supported transition metal oxides formation is highly dependent on its synthesis parameters such as oxygen vacancy concentration and metal precursor selection. Savereide et al [40] synthesized CoO x /CeO 2 catalyst by incipient wetness impregnation method with different Co precursors, namely cobalt (II) nitrate hexahydrate, cobalt (II) acetate, cobalt (III) acetylacetonate, and disodium cobalt (II) on the CeO 2 nanorods and commercial nanoparticles. They mainly found that the CeO 2 nanorods is better than the commercial CeO 2 nanoparticles due to greater number of defects in nanorods consistent with better anchoring at the oxygen vacancy defects, and the cobalt (III) acetylacetonate outperforms other precursors.…”

Section: Effect Of Ceomentioning

confidence: 99%

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

et al. 2021

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Removal of nitrogen oxides during coal combustion is a subject of great concerns. The present study reviews the state-of-art catalysts for NO reduction by CO, CH4, and H2. In terms of NO reduction by CO and CH4, it focuses on the preparation methodologies and catalytic properties of noble metal catalysts and non-noble metal catalysts. In the technology of NO removal by H2, the NO removal performance of the noble metal catalyst is mainly discussed from the traditional carrier and the new carrier, such as Al2O3, ZSM-5, OMS-2, MOFs, perovskite oxide, etc. By adopting new preparation methodologies and introducing the secondary metal component, the catalysts supported by a traditional carrier could achieve a much higher activity. New carrier for catalyst design seems a promising aspect for improving the catalyst performance, i.e., catalytic activity and stability, in future. Moreover, mechanisms of catalytic NO reduction by these three agents are discussed in-depth. Through the critical review, it is found that the adsorption of NOx and the decomposition of NO are key steps in NO removal by CO, and the activation of the C-H bond in CH4 and H-H bonds in H2 serves as a rate determining step of the reaction of NO removal by CH4 and H2, respectively.

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Section: Effect Of Ceomentioning

confidence: 99%

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

et al. 2021

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“…The choice of metal precursors for supported metal catalysts constitutes an important component in catalyst synthesis protocols. − Metal precursors are known to interact differentially with the support, leading to changes in catalyst reactivity. , More specifically, the Mo crystals in the MDA reaction could interact with the zeolite support on the external surface or migrate inside the zeolite pores and anchor at different Al sites. Depending on the geometry of the crystal and the site of anchoring, the formation of Mo carbide species on carburization could be affected, which may be reflected in the overall reactivity of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Rational Tailoring of Metal Precursor Interactions with the Zeolite Support in the Mo/HZSM-5 Catalyst for Methane Dehydroaromatization

Balyan,

Ahangar,

Ussama

et al. 2024

Crystal Growth & Design

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Two different forms of molybdenum crystals (α-MoO 3 and h-MoO 3 ) are synthesized with an aim to study their role in dictating the catalytic activity of the Mo/HZSM-5 catalyst in the methane dehydroaromatization (MDA) reaction. The catalyst prepared from impregnating the metastable hexagonal crystal form (h-MoO 3 ) on the zeolite support resulted in a higher benzene formation rate (390 nmol/g cat •s) and reduced coke (1.2 wt %) as compared to α-MoO 3 /HZSM-5 (228 nmol/g cat •s and 2.7 wt %, respectively). Insights into the metal precursor interactions with the zeolite surface are obtained using molecular dynamics (MD) and density functional theory (DFT) simulations. MD simulations revealed a greater interaction of the h-MoO 3 crystal structure with the zeolite surface, while DFT calculations indicated a facile anchoring of the molybdenum oxide species derived from h-MoO 3 crystals at the Brønsted acid sites. Following this, the reason for the high activity of h-MoO 3 /HZSM-5 is attributed to the metal precursor interaction with the zeolite during the impregnation process, which resulted in the formation of desired active molybdenum carbide species, as evidenced in temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) experiments.

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“…Base metal catalysts have largely been explored to evade the issues arising from the high cost and low availability of noble metals. [8][9][10][11] Although base metals catalysts have excellent potential, they lack the intrinsic reactivity and durability required for automotive applications. Consequently, a practical system requires large amounts of PGMs to satisfy strict regulations.…”

Section: Introductionmentioning

confidence: 99%