Denitration catalyst with high sulfur resistance and high alkali metal resistance, and preparation method thereof

Abstract

The invention discloses a denitration catalyst with high sulfur resistance and high alkali metal resistance, and a preparation method thereof. The catalyst is prepared by taking tetrabutyl titanate and tetraethyl silicate as carrier precursors, vanadyl sulfate and neodymium nitrate as active component precursors and cerium nitrate and ammonium molybdate as assistant precursors through centrifuging, drying and calcining by adopting a sol-gel process and a coprecipitation process. The prepared denitration catalyst with high sulfur resistance and high alkali metal resistance effectively overcomesthe defects of narrow temperature window, poor alkali metal resistance and poor sulfur resistance of a traditional denitration catalyst. When the temperature is 150-450 DEG C, the air speed is 1000-100000 h<-1>, the SO2 concentration is 0-3000 mg / m<3>, and the K2O concentration of the catalyst is 0-1.5%, the catalyst has an excellent denitration efficiency and an excellent N2 selectivity, and issuitable for nitrogen oxide emission control under flue gas conditions of a coal-fired power plant, a coking plant, a glass kiln, a cement kiln and the like.

Description

technical field

[0001] The invention relates to an SCR catalyst and a preparation method, in particular to a denitrification catalyst with strong sulfur resistance and alkali metal resistance and a preparation method, belonging to the technical field of air pollution control. Background technique

[0002] Selective catalytic reduction (SCR) technology is the mainstream technology of coal-fired boiler denitrification engineering, and has been widely used in coal-fired power plants in my country. By the end of 2018, about 810 million kilowatts of coal-fired power units had reached the ultra-low emission limit nationwide, accounting for 80% of the total installed capacity of coal power in the country; a total of 650 million kilowatts of energy-saving renovations had been completed, and the renovation target for 2020 was completed ahead of schedule, which is of great significance and also It represents that my country's environmental protection work has reached a new level, enter...