32results about How to "Avoid localized overheating" patented technology

The invention relates to the technical field of catalytic chemistry and provides an iron-based catalyst and a preparation method thereof. The preparation method comprises the following steps of: adding a molecular sieve and silicon oxide into an iron salt solution, and stirring the mixture to obtain a turbid solution; evaporating a solvent to dryness; then drying the mixture in an oven to obtain a solid; and roasting the solid to obtain the iron-based catalyst. According to the iron-based catalyst provided by the invention, by taking a metal iron and the molecular sieve as active ingredients of the catalyst, the pore diameter of the molecular sieve is relatively small, so that diffusion of reaction gas and products is not facilitated; silicon dioxide as a dispersant of the catalyst plays a role of dispersing the metal iron and the molecular sieve, and meanwhile has a supporting effect; and by adding silicon dioxide, a local overheating phenomenon is avoided, and the selectivity of the catalyst is improved. The catalyst prepared by the preparation method for Fischer-Tropsch synthesis reaction is very high in selectivity of hydrocarbon fraction, the number of carbon atoms of which is 10-16, and the content of isoparaffin is increased. The catalyst is suitable for being used as aviation fuel, so that the investment cost and operating cost of the device can be effectively lowered.