Each method for manufacturing catalysts is actually a combination of a series of operational units. For convenience, the key and distinctive operational units are named as the manufacturing method. Traditional methods include mechanical mixing, precipitation, impregnation, solution evaporation, thermal melting, leaching (leaching), and ion exchange. Newer methods include chemical bonding and fibrosis.
This method is simple and easy to implement. For example, in the manufacture of conversion-absorption desulfurizers, active components (such as manganese dioxide, zinc oxide, and zinc carbonate) and a small amount of binder (such as magnesium oxide and calcium oxide) are metered and continuously added to a rotating disk with adjustable speed and inclination. Simultaneously, metered water is sprayed in, and the powder is rolled, mixed, and bound to form spheres of uniform diameter. These spheres are then dried and calcined to obtain the finished product.
This method is used to manufacture catalysts requiring high dispersion and containing one or more metal oxides. In the manufacture of multi-component catalysts, suitable precipitation conditions are crucial for ensuring the homogeneity of the product composition and producing high-quality catalysts. The usual method involves adding a precipitant (such as sodium carbonate or calcium hydroxide) to a solution of one or more metal salts, followed by precipitation, washing, filtration, drying, shaping, and calcination (or activation) to obtain the final product.
