Titanium-based catalyst for marine diesel engine low-temperature selective catalytic reduction system and preparation method

Abstract

The invention provides a titanium-based catalyst for a marine diesel engine low-temperature selective catalytic reduction system and a preparation method. Titanium nanotubes were dissolved in 0.1mol / L nitric acid, ultrasonically treated for 30min, then multi-walled carbon nanotubes were added into 0.1mol / L sodium dodecyl sulfate solution, ultrasonically treated for 1h, according to the multi-walled carbon nanotubes and The mass ratio of titanium nanotubes is 10:1~2, the two solutions are mixed and stirred for 12 hours, then the mixed solution is filtered and washed to obtain a composite carrier of multi-walled carbon nanotubes and titanium nanotubes; the multi-walled carbon nanotubes and The titanium nanotube composite carrier is impregnated in manganese nitrate solution, the impregnation is carried out at room temperature, and then dried and calcined to obtain a black solid which is the titanium-based catalyst. The prepared catalyst Mn-Ce / MCNTs-TNTs has high low-temperature activity, good sulfur resistance and high specific surface area.

Description

technical field [0001] The invention relates to a catalyst for an SCR system, in particular to a catalyst for a low-temperature SCR system of a marine diesel engine. The invention also relates to a preparation method of the SCR system catalyst. Background technique [0002] With the vigorous development of the shipping industry, the pollution of exhaust emissions from marine diesel engines is becoming more and more serious. As one of the main pollutants in exhaust gas, nitrogen oxides (NO X ) will not only promote the formation of acid rain and deplete the ozone layer, but also lead to the generation of photochemical smog, which is harmful to human health. For this reason, all countries in the world have imposed NO requirements on marine diesel engines. X Emissions impose increasingly stringent requirements. [0003] Low-temperature Selective Catalytic Reduction (SCR) technology is to meet two-stroke diesel engine NO X One of the most promising technical routes for emis...

AI Technical Summary

Problems solved by technology

while the catalyst is low temperature NH 3 - The key issue of SCR technology, the current low temperature NH 3 -SCR catalysts still have problems such as high activation temperature, small specific surface area, low catalyst activity, and poor moisture and sulfur resistance.

[0004] At present, most of the SCR catalysts used in engineering are V 2 o 5 / TiO 2 A series of catalysts, this type of catalyst has high activity and good stability, but there are still catalysts with high cost, high toxicity, relatively narrow activity temperature range (300 ~ 400 ° C), easy to form N 2 O, catalyst life is short, easy to block and deactivate, expensive, SO 2 Oxidation to SO 3 very active

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