Controlling the Physical Properties of Magnesium Oxide Using a Calcination Method in Aerogel Synthesis: Its Application to Enhanced Sorption of a Sulfur Compound

Abstract

To synthesize mesoporous magnesium oxide (MgO) with a high surface area and pore volume, a calcination procedure was developed for hydrated MgO prepared by the same aerogel method. The sorption capacities of as-prepared MgO compounds were evaluated by breakthrough experiments to remove methylmercaptan (291 μmol/mol) from methane. The surface area of nanosized MgO varied from 296.6 to 503.5 m 2 /g, depending on the calcination procedure. The physical properties and sorption capacity of MgO were affected by the final temperature, step, and heating rate during calcination, but the sorption capacity could not be evaluated only by the surface area and pore volume. MgO prepared by the four-step calcination method, which had two additional steps in the significant decomposition temperature range, had 2−11 times higher sorption capacity than MgO by other calcination methods. This suggests that optimizing the calcination method is as important as searching for a new synthesis route.

Enhancing the Heat Transfer Efficiency in Graphene–Epoxy Nanocomposites Using a Magnesium Oxide–Graphene Hybrid Structure

“…17,31,32 The diffraction peaks of the hybrid at 37.2°, 43°, 62.5°, 75°, and 78.8°correspond to lattice planes (111), (200), (220), (331), and (222), respectively, and indicate a standard pattern of the pure cubic phase of MgO with a crystalline lattice parameter a of 4.22 Å. These results show good agreement with the JCPDS data (75-0447), 33 which implies that the MgO@GR hybrids were successfully synthesized. Figure 2a shows the "folding" structure of the untreated GR, which exhibits a smooth thin sheet surface without any additives or impurities.…”

Salt-Composition-Controlled Precipitation of Triple-Salt-Promoted MgO with Enhanced CO2 Sorption Rate and Working Capacity

“…The same phenomenon was also observed in previous studies. 10,27 Compared with MgO0.1-1-0-N, the sample prepared with an extended aging time and stirring during drying (MgO0.1-10-10-Y) had a higher mesopore volume (0.342 cm 3 /g) but a similar surface area and micropore volume. When the salt amount was increased from MgO0.1-1-0-N to MgO0.2-1-0-N, reductions in the surface area and mesoand micropore volumes were observed, as shown in Table 1.…”

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

“…Chemical properties and surface composition of magnesium oxide are also influenced by the calcination procedure [4,5] (used temperature and used medium, i.e., air or vacuum) and also by the source of the precursor. Based on the various result, physical adsorption of water only occurs if MgO contains surface defects, such as high quantity of pores [6].…”