Magnesium oxide as a heterogeneous catalyst support

Abstract

<jats:title>Abstract</jats:title><jats:p>Researchers normally consider MgO as a promising high-surface-area heterogeneous catalyst support, additive, and promoter for many kinds of chemical reactions due to its certain properties, including stoichiometry and composition, cation valence, redox properties, acid-base character, and crystal and electronic structure. The presence of MgO as a support catalyst also modifies the electronic state of the overall catalytic performance by electron transfer between the native catalyst and MgO as support. The influence is clarified by alteration of acid-base properties of the catalyst-supported MgO. Meanwhile, the method, chemical composition, and condition in the preparation of MgO are the important factors affecting its surface and catalytic properties. Therefore, MgO with a high surface area and nanocrystalline structure has encouraging applications for some reactions, including as dry reforming, dehydrohalogenation, oxidative dehydrogenation of butane, nonoxidative dehydrogenation of ethylbenzene, decomposition of CCl</jats:p>

Linear sweep voltammetry coupled to a quartz crystal microbalance for investigating the catalytic activity of the Mg(II)–water electrochemical system and managing the Mg oxy-hydroxide hydration state

“…1,i from Fig. 1,ii) determines the net current related to the presence of Mg (H 2 O) 6 2 + (Fig. 1,iii), showing a pseudo-plateau corresponding to masstransfer limitation.…”

“…We logarithmically analysed (Tafel law, I = I°exp(−β c nFη/RT)) current flow through the resonator versus E for the I = f(E) data acquired in NaCl (0.1 M) and in Mg(H 2 O) 6 2 + (2 × 10 − 2 M), NaCl (0.1 M), for comparison of the kinetic parameters (i°, β c ) of the involved redox systems. Equation Δ R G°= − RTlnK eq = − nFE served to evaluate the equilibrium constant K eq of the involved reaction.…”

“…Magnesium-based materials are used for industrial and environmental applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. Specifically, Mg and its alloys are of interest for energy-storage applications [14][15][16][17][18][19][20] due to their high volumetric capacities.…”

“…Coupled LSV (left axis, curves i and ii) and QCM (right axis, curves i' and ii') measurements. Curve iii was obtained by subtracting curve ii from curve i. of a Mg(H 2 O)6 2 + cluster according to Eq. (8):…”

Formation of the honeycomb-like MgO/Mg(OH)2 structures with controlled shape and size of holes by molten salt electrolysis

“…Magnesium oxide/hydroxide synthesis by the electrolysis from magnesium nitrate, sulphate and chloride aqueous electrolytes (with different additives and precursors) has been reported. [1][2][3][4][5][6] However, the additional annealing of electrochemically produced magnesium hydroxide is needed to produce MgO. The additional thermal treatment causes calcination and certain level of magnesium oxide crystallization.…”