Catalyst for cement kiln gas denitration and preparation method thereof

Abstract

The invention relates to a catalyst for cement kiln gas denitration and a preparation method thereof. The catalyst is characterized in that cerium zirconium titanium tungsten composite sulfate is utilized as catalyst active components, one or more of iron, copper, molybdenum or lanthanum oxide is utilized as a cocatalyst, and an aluminum silicon titanium mixing oxide is utilized as a carrier. The preparation method comprises the steps of uniformly stirring a cerium zirconium titanium tungsten composite sulfate precursor, acid alumina gel, pseudo-boehmite, kieselguhr, titanium dioxide and an organic addition agent together, mixing, aging and carrying out extrusion molding on the mixture, and drying and roasting to obtain the integral catalyst. The catalyst provided by the invention has the advantages that the NOx removing efficiency is high, an active temperature window is wide, the catalytic denitration efficiency can achieve 90% above in the range of 280-430 DEG C, and the highest activity can achieve 99.7%; the catalyst has the strong alkali-resisting metal and alkaline earth poisoning capacity and has the high wear-resisting property; the components of the catalyst are non-poisonous and thus the catalyst has an environment-friendly effect; the mechanical strength is high, the preparation technology is simple, the cost is low, and the catalyst is particularly suitable for removing of high dust, high alkali metal and NOx in high alkaline earth smoke of a cement kiln.

Description

technical field [0001] The invention relates to a catalyst for flue gas denitrification of cement kilns and a preparation method thereof, which belongs to the field of environmental protection catalytic materials and air pollution control, and is especially suitable for denitrification treatment of flue gas with high dust, high alkali metal and high alkaline earth metal content in cement kilns . Background technique [0002] Nitrogen oxides (NO x ) is one of the chief culprits of smog, acid rain, photochemical smog and greenhouse effect. my country is the world's largest NO x Emitting country, 2013 NO x Emissions reached 22.4 million tons, NO x Treatment (flue gas denitrification) has become the focus of the country's "Twelfth Five-Year Plan" air pollution control. Cement plant as the second largest NO x Emissions from stationary sources, whose flue gas denitrification becomes NO x The top priority of emission reduction. Selective Catalytic Reduction (SCR) denitrific...

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Problems solved by technology

Among them, the patent (CN102500358B) uses oxides of cerium, vanadium, copper, cobalt, etc. The tube is expensive, the preparation is too complicated, and there is a highly toxic substance vanadium in the active component, which is easy to cause secondary pollution

Patent (CN103240081A) prepared TiO 2 -SiO 2 Manganese-based denitration catalyst as a carrier, the catalyst is suitable for low temperature environment after dust removal, but manganese-based denitration catalyst encounters SO 2 easily inactivated

The patent (CN103230813A) prepared a catalyst for anti-alkali poisoning. The catalyst uses manganese, cerium and other oxides as active components, but the catalyst is suitable for lower denitrification temperature, and the optimal denitrification temperature is lower than 250 °C. The catalyst encounters SO 2 easily inactivated

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