Browsing by Author "Sweta Sharma"
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PublicationArticle Effect of (M = Co, Cu, Cr, and Mo) M/CeO2-MgO catalysts in selective catalytic reduction of NOx with hydrogen under excess oxygen condition(Elsevier Ltd, 2023) Vivek Kumar Patel; Shyam Sunder Rao; Sweta SharmaEfficient NOx removal is an important for controlling air pollution, and developing effective catalysts is a significant challenge. In this study, (M = Co, Cu, Cr, and Mo) M/CeO2-MgO catalysts were prepared by the co-precipitation method followed by the wet-impregnation method for NO removal by H2-SCR technology. The catalysts were characterized by BET, XRD, XPS, TEM, and H2-TPR. The CeO2-MgO showed the BET surface area of 78 m2/g, which is slightly decreased after the impregnation of Cu, Co, Cr, and Mo metals. X-ray diffraction showed the presence of cubic phase by CeO2 and MgO. The Cu/CeO2-MgO catalyst shows the highest lattice strain, Ce3+ content, and adsorbed oxygen with values of 0.66%, 30.54%, and 74.12%. A maximum NOx conversion of 78% was achieved over the Cu/CeO2-MgO catalyst with a slightly large temperature window (100–250 ℃) among all the catalysts. The catalyst's sequence of NOx conversion was as follows: Cu/CeO2-MgO > Mo/CeO2-MgO > Co/CeO2-MgO > Cr/CeO2-MgO > CeO2-MgO. The N2 selectivity followed the same order as NO conversion except for the Cr catalyst, which performed better than the Co impregnated catalyst. © 2023 Elsevier LtdPublicationArticle Effect of Promoters (Co, Cr, Fe, Zr) on the Performance of MnO2/CeO2 Catalysts for NO Reduction at Low Temperatures Using NH3-SCR(Springer, 2024) Shyam Sunder Rao; Sweta SharmaThis study examined the effect of various promoters (Co, Cr, Fe, Zr) in reducing NO using the NH3-SCR reaction on the MnO2/CeO2-Nanorod catalysts. The physicochemical properties of these catalysts were characterized using Brunauer–Emmett–Teller, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscope, scanning electron microscope-energy dispersive X-ray spectroscopy, and Raman spectroscopy. Characterization analysis revealed uniform dispersion of active metals on CeO2-Nanorod supports, desired active metal-support synergism, small crystallite sizes, high specific surface areas, and an appreciable amount of surface lattice oxygen in Co–MnO2/CeO2-Nanorod catalysts. Co–MnO2/CeO2-Nanorod catalyst showed the best NH3-SCR activity at low temperatures. The NO conversion and N2 selectivity are 87 and 85%, respectively, at 300 °C with excellent stability. The Co–MnO2/CeO2-Nanorod catalyst also showed excellent tolerance against the H2O and the SO2. The catalyst’s performance can be attributed to its high surface area, oxygen storage capacity, high Ce3+ content, and evenly distributed promoters. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023.PublicationLetter SEPN1 Related Myopathy Presenting as Chronic Respiratory Insufficiency(Springer, 2024) Sunil Kumar Rao; Gitesh Jhalaria; N. Rambabu; Hemant Yadav; Sweta Sharma; Anil Kumar Saroj[No abstract available]