SCR catalyst for ship diesel engine post-treatment, and preparation method thereof

Abstract

The invention relates to a catalyst, and especially relates to an SCR catalyst for ship diesel engine post-treatment, and a preparation method thereof. The catalyst adopts a ZSM-5 molecular sieve with a high specific surface area as a supporter, and adopts vanadium, tungsten, copper, manganese and cerium metal elements as active components. The specific surface area of the ZSM-5 molecular sieve with a high specific surface area is above 500m<2> / g, and the specific pore volume of the ZSM-5 molecular sieve with a high specific surface area is above 0.6mL / g. The preparation method comprises the following steps: preprocessing ZSM-5 molecular sieve powder with a high specific surface area to remove superfluous water in the molecular sieve powder; mixing the active components with water to obtain an active component solution, wherein the volume of water is the product of the mass of the ZSM-5 molecular sieve and the specific pore volume of the ZSM-5 molecular sieve; adding the active component solution to the preprocessed ZSM-5 molecular sieve with a high specific surface area in a dropwise manner, and continuously stirring to obtain a viscous material; and heating the viscous material for drying, and calcining; and cooling. The catalyst has the advantages of high catalysis activity, high hydrothermal stability, high sulfur resistance, and wide active temperature window, and can guarantee that denitration of tail gas of ship diesel engines meets requirements of Tier III standards.

Description

technical field

[0001] The invention relates to a catalyst, in particular to an SCR catalyst used for aftertreatment of marine diesel engines and a preparation method thereof. Background technique

[0002] With the continuous increase in the number of transport ships, the pollution and harm caused by the pollutants discharged by ships to the atmosphere and water bodies are also becoming more and more serious. According to statistics, diesel-powered ships emit nitrogen oxides (NOx) into the atmosphere every year X ) about 6.5 million tons, sulfur oxides (SO X ) about 6 million tons, and particulate matter (PM) 1.7 million tons, causing serious air pollution, including air quality decline, greenhouse effect, acid rain and atmospheric ozone layer destruction, etc., and seriously endangering human health. The International Maritime Organization (IMO) has formulated a series of ship pollution prevention conventions to limit the emission of ship exhaust and strengthen the protec...

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