Marine diesel engine low temperature selective catalytic reduction system titanium-based catalyst and preparation method thereof

Abstract

The invention provides a marine diesel engine low temperature selective catalytic reduction system titanium-based catalyst and a preparation method thereof. The preparation method comprises following steps: titanium nanotube is dissolved in 0.1mol / L nitric acid for 30min of ultrasonic treatment; multiwalled carbon nanotube is added into 0.1mol / L sodium dodecyl sulfate solution for 1h of ultrasonic treatment; the obtained two solutions are mixed and stirred for 12h at a multiwalled carbon nanotube / titanium nanotube mass ratio of 10:1-2, and an obtained mixed solution is filtered and washed so as to obtain a multiwalled carbon nanotube-titanium nanotube complex carrier; the multiwalled carbon nanotube-titanium nanotube complex carrier is subjected to dipping in a manganous nitrate solution at room temperature; and an obtained product is subjected to drying and calcination so as to obtain the black solid titanium-based catalyst. The prepared catalyst Mn-Ce / MCNTs-TNTs possesses relatively high low temperature activity, excellent sulfur resistance, and relatively large 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. Low-temperature Selective Catalytic Reduction (SCR) technology is to meet two-stroke diesel engine NO X One of the most promising technical routes for emission regu...

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.

[0003] At present, most of the SCR catalysts used in engineering are V 2 o 5 / TiO 2 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), and easy formation of 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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