TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The process is a dry process. In the process: at least one of the reactions is a wet reaction; operated as a batch process, or continuous process; solar power is used as a source of heat for at least one of the reactions; and a first portion of the second salt forming the double salt: is sodium, potassium, vanadium, chromium, niobium, titanium, molybdenum, manganese, iron; or is different than M; and a second portion of the second salt forming the double salt: is chlorine, bromide or iodine; and is the same as X. The heat used in: all reactions is at a temperature equal to or lower than the temperature of the heat used in reducing MX to a lower valence state; all reactions is at 600 degrees C or below; and reducing MX to a lower valence state is at 400 degrees C or below. The process further comprises feeding the produced hydrogen into: an integrated gas combination cycle; a gas turbine to generate electricity; a process for generating natural gas from coal; and a process for refining crude oil. Preferred Components: The catalyst is: lead (IV) chloride, antimony pentachloride, chromium (IV) chloride, manganese (IV) chloride, cobalt (III) chloride, potassium nickel tetrachloride (KNiCl4), nickel (III) chloride, bismuth pentachloride, iron (III) chloride(preferred), or copper (II) Chloride; used in reacting the gas with water and acid-absorbing material; and a cobalt catalyst or a copper catalyst. The acid absorbing material is: capable of regenerating by heat; a polymer having an active amine group, amines, or compounds that form a hydrogen halide salt; and monoethanolamine, diethanolamine, triethanolamine, melamine, zeolites, charcoals, silicas, alumina, magnesia or compounds that have any functionality that can reversibly absorb acid gas. The source of heat for at least one of the reactions is exhaust from a gas turbine, flue gases, waste heat from any chemical reactions, where heat is available, foundry cooling processes, burning of off-gases from a refinery, and oil and natural gas well, intentional burning of lower British thermal unit (BTU) gases which produce a lower flame temperature than pure fuels, and the burning of any fuels for the purpose of generating hydrogen and oxygen. The X is chlorine, bromine and iodine. The MX is in the form of a double salt comprising a second salt. M is vanadium, chromium, niobium, titanium, molybdenum, manganese or iron. EXAMPLE - None given.