The invention relates to systems and processes for treating particulate oxides of manganese useful as oxidizing sorbents for capturing or removing target pollutants from industrial gas streams, including, but not limited to, nitrogen oxides (NO.sub.x), sulfur oxide (SO.sub.x), mercury (Hg), hydrogen sulfide (H.sub.2S), other totally reduced sulfides (TRS), and oxides of carbon (CO and CO.sub.2) gases. Oxides of manganese are washed an aqueous oxidizing solution, which may be adjusted as necessar...

A converter for converting a system of office tone-controlled telephones to enable the use of tone pushbuttons in the placing of inside calls. A series of tone detectors are provided, two of which are responsive to the two frequency components of a tone for lighting lamps in a matrix which act upon photoresistors in coded combinations in the matrix oupout lines, the output lines being coupled to the ringers in the respective telephones in the system. Means are provided for lighting indicator lam...

A method of producing manganese dioxide comprising the steps of pouring an aqueous solution of a soluble manganese salt and an aqueous solution of alkali carbonate into a reaction vessel and mixing the two solutions so that the two solutions may react with each other to produce manganese carbonate, heating the manganese carbonate produced in an atmosphere containing water vapor to produce crude manganese dioxide, and washing the crude manganese dioxide produced with dilute or concentrated nitric...

Porous manganese oxide pellets in which a major portion of the manganese oxides is manganous oxide and the porosity of the pellets is not less than about 45%. Preferably, substantially all the manganese oxide in the pellets is manganous oxide and the porosity is about 60 percent. The porous manganese oxide pellets are between about one-fourth inch to about five-eighths inch in diameter. The pellets are useful as sulfur acceptors whereby they can be used to reduce the sulfur content of other mate...

Manganese dioxide is prepared from a manganese (III)-containing oxide by disproportionating the latter with a perhalo acid to yield both manganese dioxide and a solution containing manganese (II) ions, and, if desired, removing the manganese dioxide precipitate from the manganese (II) ion solution. The manganese (II) solution wherein the manganese exists as a manganese (II) perhalate can then be quantitatively oxidized to manganese dioxide by ozone.

Manganese oxide octahedral molecular sieve (OMS) is produced by the method comprising: a) forming an aqueous reaction medium containing manganese cation and permanganate anion, the reaction medium being maintained at a pH of not greater than about 4.5; b) refluxing the aqueous reaction medium under conditions which are effective to produce solid crystalline manganese oxide octahedral molecular sieve product; and, c) recovering the solid crystalline product. The method of this invention is carrie...

Methods for the preparation of mixed-valence manganese oxide compositions with quaternary ammonium ions are described. The compositions self-assemble into helices, rings, and strands without any imposed concentration gradient. These helices, rings, and strands, as well as films having the same composition, undergo rapid ion exchange to replace the quaternary ammonium ions with various metal ions. And the metal-ion-containing manganese oxide compositions so formed can be heat treated to form semi...

A method of preconditioning manganese dioxide for use in a rechargeable alkaline electrochemical cell. The method includes the step of contacting unreduced manganese dioxide (e.g., electrolytic manganese dioxide) with a solution of hydroquinone in an environment having a pH greater than or equal to 5 that is essentially free of dissolved oxygen to partially reduce the unreduced manganese dioxide to manganese dioxide generally represented by the formula wherein x is between about 1.80 and about 1...

Manganous oxide is converted directly to manganous hydroxide by hydration in the presence of a catalyst. The product has high purity and reactivity.

A process of preparing Mn.sub.3 O.sub.4, by the reduction of higher manganese oxides, using methane as a reducing gas under controlled temperatures.