Cocatalyst for reducing FCC (fluid catalytic cracking) regeneration flue gas pollutant discharge and application thereof

Abstract

The invention relates to a cocatalyst for reducing the FCC (fluid catalytic cracking) regeneration flue gas pollutant discharge and application thereof. The cocatalyst comprises microsphere particles A and microsphere particles B, wherein through being metered by 100 percent of the weight of the microsphere particles A, the microsphere particle A is prepared from 80 to 98 percent of aluminum oxide, 0.1 to 10 percent of silicon oxide, 1 to 15 percent of oxide of one or two kinds of metals selected from groups VIB and IB and 0.1 to 3 percent of oxide of rare earth elements; through being metered by 100 percent of the weight of the microsphere particles B, the microsphere particle B is prepared from 50 to 80 percent of aluminum oxide, 10 to 50 percent of oxide of one or several kinds of metals selected from groups IIA, IVB and VIII and 0.1 to 10 percent of oxide of rare earth elements. The cocatalyst is applied to the reduction of nitrogenous pollutant discharge; the discharge of atmospheric pollutants such as NOx, Sox and CO in regeneration flue gas can be obviously reduced.

Description

technical field [0001] The invention relates to a co-catalyst for reducing the emission of atmospheric pollutants such as NOx, SOx and CO in the regeneration flue gas of an FCC device and its application. Background technique [0002] Fluid catalytic cracking (hereinafter referred to as FCC) unit is one of the important heavy oil lightening units in refineries. It is the core unit for the production of light oil, especially high-octane gasoline, and also an important unit for the production of low-carbon olefins and other organic chemical raw materials. craft. However, the FCC regeneration flue gas contains a certain amount of pollutant gases such as SOx, NOx and CO, which are not friendly to the environment. According to statistics, SOx and NOx emitted by refineries account for 6%-7% and 10% of the total emissions in the air respectively, most of which come from FCC devices. [0003] The NOx and SOx in FCC regeneration flue gas mainly come from nitrogen-containing compoun...

AI Technical Summary

Problems solved by technology

At present, the development and application of three-way co-catalysts have reduced the emission of flue gas pollutants from FCC units to a certain extent, but in general, the three-way co-catalysts in industrial application reports are mainly for SOx removal, and most of them are used in NOx For devices with low initial concentrations, the use of these co-catalysts has not yet achieved the goal of efficiently removing SOx under high-concentration NOx conditions

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