Sulfur-resisting and nitrogen-removed oxide compound metallic oxide SCR (Selective Catalytic Reduction) catalyst and preparation method thereof

Abstract

The invention discloses a sulfur-resisting and nitrogen-removed oxide compound metallic oxide SCR catalyst and a preparation method and applications thereof. The catalyst contains the following elements in the molar ratio: 0.2-2 percent of structural auxiliary element M, 2-4 percent of chromium element and 5-8 percent of manganese element. The preparation method comprises the following steps of: (1) respectively dissolving metal precursors into a citric acid, and evenly stirring and standing for 1-5 hours to respectively obtain an M metal citric acid solution, a chromium metal citric acid solution and a manganese metal citric acid solution; (2) simultaneously and evenly dropwise adding all the metal citric acid solutions to a container and stirring without stop, and continuing to stir for 0.5-3 hours after all the metal citric acid solutions are dropwise added completely; (3) placing the container in a drying oven for drying for 8-15 hours at the temperature of 90-150 DEG C, and then calcining in a muffle furnace for 100-350 min; and (4) tabletting calcined products and then grinding and sieving. The catalyst can be applied to automobile exhaust NOx treatment devices or the denitrification devices of stationary source coal fired power plants.

Description

technical field [0001] The invention belongs to the field of preparation of heterogeneous catalysts, in particular to a composite metal oxide SCR catalyst resistant to sulfur and nitrogen oxide removal and its preparation method and application. Background technique [0002] Flue gas emission is an important source of air pollution, so purifying flue gas is an important means of controlling air pollution. Greenhouse gases mainly start from the perspective of energy saving and emission reduction and new energy development. Flue gas desulfurization technology has become increasingly mature and stable. For denitrification technology, selective catalytic reduction (SCR) is the most effective and most widely used technology. Currently, the NH 3 Selective catalytic reduction (NH 3 -SCR)NO x Catalysts are mainly divided into four categories: metal catalysts, molecular sieve catalysts, carbon-based catalysts and metal oxide catalysts. Compared with the high cost of metal catalyst...

AI Technical Summary

Problems solved by technology

However, the temperature of the flue gas after passing through the FGD device is only 60°C. In order to make the flue gas reach the catalyst reaction temperature before entering the denitrification reaction device, it is necessary to add fuel or natural gas burners or steam heat exchangers in the flue to increase energy. Consumption and running costs