Abstract
Periclase-like magnesia nanoparticles (MgO(μ) NPs) were obtained by calcination at ≥ 400 °C of brucite-like Mg(OH)2 NPs synthesized in water-in-n-heptane microemulsion system stabilized by a mixture of cationic and nonionic surfactants. The bulk and surface properties of the hydroxide NPs were characterized, before and/or after calcination at 400, 600 and 800 °C by means of thermogravimetry, X-ray powder diffractometry, X-ray photoelectron spectroscopy (XPS), electron microscopy (SEM/HRTEM) and N2 sorptiometry. The results obtained could help revealing that the yielding MgO(μ) NPs assume high-temperature stable (up to 800 °C) crystallite structure (cubic) and size (25–30 nm), and surface area (93–68 m2 g−1), mesopore size (15–21 nm), morphology (coalesced platelets) and microstructure ((100) and (200) faceted) XPS-implied moderate surface basicity, and ability to ionosorb O2 molecules and disproportionate CO molecules have rendered MgO(μ) NPs a catalyst that is capable of triggering the CO oxidation at a temperature as low as 50 °C, as well as undertaking 50% CO conversion at a temperature as low as 180 °C. To the best of our knowledge, no such a low CO oxidation light-off temperature has hitherto been reported for MgO bulk catalysts.
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The authors gratefully acknowledge the support of Kuwait University Research Administration, College of Graduate Studies, RSPU Facilities (GS 01/01, GS 03/01, GS 01/05, GS 02/08 and GE 03/08), and the Nanoscopy Science Centre.
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Bumajdad, A., Al-Ghareeb, S., Madkour, M. et al. Synthesis of MgO nanocatalyst in water-in-oil microemulsion for CO oxidation. Reac Kinet Mech Cat 122, 1213–1229 (2017). https://doi.org/10.1007/s11144-017-1281-0
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DOI: https://doi.org/10.1007/s11144-017-1281-0