937 results about "Acid dissolution" patented technology

The invention relates to a preparation method for red mud-based iron-series catalyst and application of the red mud-based iron-series catalyst in hydrogen production through cracking of methane. The preparation method is characterized in that alumina industrial waste, i.e., red mud, is used as a raw material and undergoes acid dissolution treatment, then a certain amount of iron is added into the treated red mud by using a homogeneous coprecipitation method and then drying, calcining and hydrogen reduction are successively carried out so as to obtain the red mud-based iron-series catalyst. The red mud-based iron-series catalyst has a more prosperous pore structure and higher content of active metal iron compared with red mud, the particle size of the catalyst is uniform, and the dispersity of metallic iron is good. The method has the following advantages: mineral components with catalytic and catalysis-assisting functions in red mud are given to full play; the pore structure of red mud is improved; introduction of iron enables the content of the active component of the catalyst to be increased, and activity and stability of red mud in catalytic cracking of methane for hydrogen production are substantially improved; and preparation cost for the catalyst for hydrogen production through cracking of methane is reduced, and an approach for resourceful and comprehensive utilization of red mud is created.