Abstract: A novel method for forming a positive electrode active material is provided. The method for forming a positive electrode active material includes causing a reaction between a cobalt aqueous solution and an alkaline aqueous solution to form a cobalt compound; mixing the cobalt compound and a lithium compound and performing a first heat treatment to form a first composite oxide; mixing the first composite oxide and a compound containing a first additive element and performing a second heat treatment to form a second composite oxide; and mixing the second composite oxide and a compound containing a second additive element and performing a third heat treatment. The first heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1100° C. The second heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C.

Abstract: A method for treating wastewater significantly reduces an ammonium ion concentration and COD of wastewater while reducing the amount of an oxidizing gas used. The method for treating wastewater containing ammonia nitrogen, and the method includes: a first step of discharging at least a part of the ammonia nitrogen from the wastewater; and a second step of subjecting first treated wastewater which is the wastewater that has been subjected to the first step to a wet oxidation treatment.

Abstract: To provide a method that enables production of bromine in good yield. A method for producing bromine includes: a step of supplying a gas containing a bromine compound and a gas containing oxygen to a reactor that includes a catalyst packed bed, and oxidizing the bromine compound to obtain a gas containing bromine, in which the step satisfies the following 0.30?a?0.55 and 0.40?L1?6.0; where “a” represents porosity [?] of the catalyst packed bed, and “L1” is defined by the following Formula (3): Formula (3) L1=L2V/(P(aV+b))×(T+273.14)/273.14; wherein L2: Superficial velocity of reaction gas [m/s]; LP: Reaction pressure [atm]; T: Reaction temperature [° C.]; V: Reactor volume corresponding to catalyst packed bed [L]; a: Porosity of catalyst packed bed [?] and b: Pore volume of catalyst packed bed [L].

Abstract: A catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, the catalyst for halogen production including 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production while the catalyst is encapsulated in a package, and the package encapsulating therein the catalyst for halogen production for oxidizing a hydrogen halide with oxygen to produce a halogen, wherein the catalyst for halogen production includes 4% or less by volume of water with respect to a pore volume of the catalyst for halogen production.

Abstract: A molding catalyst satisfying the following formula (1): 0.800?WAV/WC?0.875??(1) wherein WAV is determined by the following formula (2) and WC is determined by the following formula (3): WAV=Wtot/n??(2) wherein Wtot is a total weight of freely-selected n pieces of the molding catalyst, WC=(VAV·?)/(1+VP·?)??(3) wherein VAV is an average of volumes of virtual cylinders each respectively having, as its height and diameter, a major axis (L) and a minor axis (D) of each of the freely-selected n pieces of the molding catalyst, ? is a true density of the molding catalyst, and VP is a pore volume per unit weight of the molding catalyst.

Abstract: To provide a method that enables production of bromine in good yield. A method for producing bromine includes: a step of supplying a gas containing a bromine compound and a gas containing oxygen to a reactor that includes a catalyst packed bed, and oxidizing the bromine compound to obtain a gas containing bromine, in which the step satisfies the following Inequality (1) and Inequality (2): 0.30?a?0.55??Inequality (1) 0.40?L1?6.0??Inequality (2) where “a” represents porosity [-] of the catalyst packed bed, and “L1” is defined by the following Formula (3): L1=L2V/(P(aV+b))×(T+273.14)/273.14??Formula (3) L2: Superficial velocity of reaction gas [m/s] P: Reaction pressure [atm] T: Reaction temperature [° C.] V: Reactor volume corresponding to catalyst packed bed [L] a: Porosity of catalyst packed bed [-] b: Pore volume of catalyst packed bed [L].