Role of cyclic voltammetry in characterizing solids: natural and synthetic manganese oxide octahedral molecular sieves

Liquid-phase epoxidation of olefins by manganese oxide octahedral molecular sieves

“…OMS-2 was prepared by the precipitation method [25]. A 0.4 M solution of KMnO 4 (13.3 g in 225 mL of distilled, deionized water, DDW) was added to a mixture of a 1.75 M solution of MnSO 4 · H 2 O (19.8 g in 67.5 mL DDW) and 6.8 mL of concentrated HNO 3 .…”

“…TBHP, being a very bulky oxidant, does not get into the channels of OMS-2 as readily as H 2 O 2 because the decomposition is slow and there could be a chance for the formation of the oxo-metal complex, which provides the necessary catalytic active sites for oxidation of cyclooctene. The OMS-2 material has Lewis acid sites, which are mainly caused by vacancies of oxygen atoms, located at vertices of octahedral structural units of OMS-2 [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Lewis base sites are due to the lone electron pairs on the oxygen atoms of TBHP.…”

Solid-State Voltammetry — Analytical Prospects

“…A related investigation was the promotion of the electroactivity of these materials by modifying their compositions. Electroactivity was imparted to an octahedral molecular sieve with the todorokite structure with Mn 2+ [107]. The possible use of voltammetry or related methods in the study of inorganic oxides, polyoxometallates and transition metal salts also was demonstrated [15,16,39,66,69,[108][109][110].…”

Identification of Manganese(IV) Centers in Archaeological Glass Using Microsample Coatings Attached to PolymerFilm Electrodes

“…In particular, the electrochemistry of solid manganese dioxide attached to carbon paste electrodes was studied by Chouaib et al [29], enabling them to distinguish between different modifications, while Roizenblat et al [37] proposed an electrochemical mechanism for the reduction of MnO 2 . De Guzman et al [40], Ivanova et al [41], and Amarilla et al [43,44] studied the electrochemistry of different natural and synthetic manganese oxides with tunnel structures. More recently, Grygar et al [51] have described the reductive dissolution of different microparticle manganese oxides correlating their structure and electrochemical reactivity.…”