Abstract: The invention relates to a method for producing hydrogen in a liquid and to a device for implementing the method characterized in that suspension 1.2 of graphene particles in the liquid is provided to reaction tank 1.1, and then the contents of the reaction tank are exposed to an electromagnetic radiation beam with a wavelength in the UV-VIS-FIR light wave range, which radiation is generated by emitter 1.5, after which the hydrogen liberated from the liquid is transferred through vent 7 outside the reaction tank.

Abstract: The invention relates to a method for producing methanol by the CO2 conversion route in a photocatalytic process, wherein a base liquid (A) in the form of demineralized and CO2-saturated water is provided to the reaction tank (1) and graphene material (B) is provided and the contents of the reaction tank (1) is exposed to electromagnetic radiation with a wavelength in the UV-VIS-FIR range that is generated by an emitter (D). The invention also relates to an installation for implementing the method.

Abstract: Preparation of alkylation catalysts containing iron oxide and/or chromium oxide, by means of a process which comprises:(a) precipitating hydrate oxides of iron and/or chromium from an aqueous solution of soluble compounds of said elements;(b) separating the thus obtained precipitate, and washing said precipitate;(c) granulating the washed precipitate, and drying the granules so obtained;(d) calcining said dried granules at high temperature;in which an organic carboxylic acid salt of iron and/or chromium is added to and homogenized with the washed precipitate from stage (b), and/or the dried granules from stage (c) are impregnated with an aqueous solution of an organic carboxylic acid salt of iron and/or chromium.The catalysts obtained by means of the above process are mechanically strong, and highly active in the production process of 2,6-xylenol by means of the alkylation of phenol or o-cresol with methanol.