Three-way NOx, CO and HC removing catalyst used in marine engine, and preparation method thereof

Abstract

The invention relates to a three-way NOx, CO and HC removing catalyst used in a marine engine, and a preparation method thereof. The catalyst takes cerium-tin-tungsten composite oxide as an active component, takes one or more oxides of cobalt, ferrum, nickel, copper, lanthanum, molybdenum, manganese, zirconium, silver and yttrium as a promoter, and takes AlSiTi composite oxide as a carrier. A saturated active component solution, a saturated cobalt promoter ionic solution, strong acid alumina gel, diaspore, clayey, titanium dioxide and an organic forming agent are stirred uniformly, mixed, aged and extruded for formation, and the integral type catalyst is obtained through drying and roasting. According to the invention, the catalyst has high NOx removing efficiency, the active temperature window is wide, and the CO and HC removing efficiency is high in a low-temperature collaborated catalyzing manner. According to the catalyst, as the components of the catalyst are nontoxic and environmental-friendly, the catalyst has the advantages that the mechanical strength is high, the vibration resistance as well as the heat resistance is excellent, the preparation technology is simple, and the cost is low. The three-way NOx, CO and HC removing catalyst is applicable to treatment of NOx, CO and HC in tail gas of a marine diesel engine, and is also applicable to treatment to tail gas of other moving sources diesel engines such as automobiles.

Description

technical field [0001] The invention relates to a three-effect removal of NO for marine engine x The catalyst of , CO and HC and the preparation method thereof belong to the fields of environment-friendly catalytic materials and air pollution control. Background technique [0002] Nitrogen oxides (NO x ), carbon monoxide (CO), and hydrocarbons (HC) are the main pollutants of marine diesel engines, which produce NO x A series of environmental problems such as acid rain endanger human life safety and living environment, and the CO and HC produced by it can directly endanger human life and health, and more and more people pay more and more attention to it. According to Annex VI of the MARPOL73 / 78 Convention, Tier3 implemented in 2016 is for NO x Emission requirements will be more stringent. The European Union's "Commercial Inland Waterway Ship Engine Emission Control Standards" is stricter than the control standards formulated by IMO, and limits the emission of other harmful...

AI Technical Summary

Problems solved by technology

Among the existing domestic patents, (CN102909003A), (CN102764643A), (CN102989467A), (CN102125834B) are all based on TiO 2 as the carrier, and in the active component V 2 o 5 Doped with other elements, its cost is expensive, the raw material is poisonous, it is easy to oxidize HC into CO, and CO is extremely difficult to remove, resulting in secondary pollution

The patent (CN100422515C) uses sintered silicon carbide particles as the support body, each particle surface has a silicon dioxide carrier layer, and the active components are vanadium oxide, tungsten oxide, and metal palladium, which can simultaneously remove nitrogen oxides substances and carbon-containing compounds, the disadvantage is that the catalyst is expensive, NO x The removal effect is not high

The patent (CN1899997A) discloses a glass-ceramic layer prepared on a metal carrier, which can effectively improve the mechanical strength of the catalyst, but the disadvantage is that the preparation process is complicated

The patent (CN102008952B) uses honeycomb ceramics as the support body, titanium-zirconium composite oxide as the carrier, and cerium-tin-tungsten composite oxide as the active component. Poor effect with HC, anti-SO 2 Poisoning performance is not ideal

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