Producing a molybdenum mixed oxide precursor, comprises producing first and second solution, which contains e.g. niobium- and antimony-containing starting compounds, introducing the solutions into micro-mixed reactor, recovering precursor

摘要

Producing a molybdenum mixed oxide precursor, comprises: (a) producing a first solution, which contains a molybdenum starting compound and at least one additional metal-containing starting compound including a vanadium-containing, tellurium-containing, antimony-containing and/or tungsten-containing starting compounds; (b) preparing a second solution, which contains a niobium-containing, iron-containing, bismuth-containing and/or antimony-containing starting compounds; (c) introducing the first and the second solution into a micro-mixed reactor; and (d) recovering the precursor. Producing molybdenum mixed oxide precursor, comprises: (a) producing a first solution, which contains a molybdenum starting compound and at least one additional metal-containing starting compound including a vanadium-containing, tellurium-containing, antimony-containing and/or tungsten-containing starting compounds; (b) preparing a second solution, which contains a niobium-containing, iron-containing, bismuth-containing and/or antimony-containing starting compounds; (c) introducing the first and the second solution into a micro-mixed reactor having a mixing/reaction chamber and a temperature controlling device, which is located in the mixing/reaction chamber, where the first and the second solutions are fed into the mixing/reaction chamber of the micro-mixed reactor by separately lying solvent partial streams and are mixed to form molybdenum mixed oxide precursor; and (d) recovering the molybdenum mixed oxide precursor obtained in the step (c) from the mixing/reaction chamber. Independent claims are also included for: (1) molybdenum mixed oxide precursor obtained by the above mentioned method; (2) producing molybdenum mixed oxide material, comprising optionally spray drying or drying, optionally carrying out hydrothermal treatment or additional heat treatment, optionally treating with supercritical carbon dioxide and water, and calcining, and optionally activating the molybdenum mixed oxide precursor, under inert gas or reduced atmosphere at temperatures above 400[deg] C; and (3) producing a nanocrystalline molybdenum mixed oxide material, comprising introducing the molybdenum mixed oxide precursor into the reaction chamber by a carrier fluid, thermally treating the precursor in a treatment zone by a pulsating flow at a temperature of 200-1000[deg] C, forming the nanocrystalline molybdenum mixed oxide material, recovering the molybdenum mixed oxide material from the reaction chamber.