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

A catalyst and co-catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problem, to achieve the effects of good thermal stability, excellent seismic performance, and simple preparation process

Active Publication Date: 2015-04-22
南京环福新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of cerium tin tungsten composite ion solution

[0028] With the molar ratio of Ce / Sn / W as 1:0.4:0.8, weigh 2.5g of cerium nitrate, 0.81g of tin tetrachloride, and 1.31g of ammonium metatungstate respectively, and dissolve them in a 15% nitric acid solution with a mass concentration of In the medium, a stable saturated solution of cerium, tin and tungsten is uniformly prepared by stirring;

[0029] (2) Preparation of the precursor ion solution of the promoter

[0030] Screen and weigh 0.08g of cobalt nitrate, dissolve it in water, and stir to prepare a uniform and stable saturated solution;

[0031] (3) Pretreatment of aluminum-silicon-titanium composite oxide precursor

[0032] With the molar ratio of Al / Si / Ti elements of 1:0.05:50, weigh 0.23g of diaspore, 0.01g of clay, and 19.73g of titanium dioxide. Weigh 0.02g of diaspore and add 0.35g of 50% nitric acid solution. Prepare acidic aluminum sol, dry-mix the remaining diaspore, clay and titanium dioxide evenly;...

Embodiment 2

[0040] (1) Configuration of cerium tin tungsten composite solution

[0041] With the molar ratio of Ce / Sn / W as 1:0.1:0.01, weigh 2.29g cerium nitrate, 0.113g stannous sulfate, 0.015g ammonium metatungstate, and dissolve them in a sulfuric acid solution with a mass concentration of 1% , The stable cerium tin tungsten conforming solution is prepared by uniform stirring;

[0042] (2) Preparation of the precursor ion solution of the promoter

[0043] Screen and weigh 0.315g silver nitrate, 0.315 silver acetate, 0.68g yttrium nitrate and 0.6g dissolved in a 1% nitric acid solution with a mass concentration of 1%, and stir to evenly configure a stable saturated solution;

[0044] (3) Pretreatment of aluminum-silicon-titanium composite oxide precursor

[0045] With the molar ratio of Al / Si / Ti as 1:0.05:50, weigh 0.242g of diaspore, 0.01g of clay, and 19.73g of titanium dioxide respectively, weigh out 0.008g of diaspore and add 0.7g of 10% nitric acid solution Prepare acidic aluminum sol, dry...

Embodiment 3

[0052] (1) Preparation of cerium tin tungsten composite ion solution

[0053] With the Ce / Sn / W molar ratio of 1:0.1:3, weigh 1.85g of cerium oxalate, 0.15g of stannous chloride, and 5.17g of ammonium tungstate, and dissolve them in a citric acid solution with a mass concentration of 15% In the medium, a stable saturated solution of cerium, tin and tungsten is uniformly prepared by stirring;

[0054] (2) Preparation of the precursor ion solution of the promoter

[0055] Screen and weigh 10.1g of ferric nitrate, dissolve it in a hydrochloric acid solution with a mass concentration of 15%, and mix it evenly to form a stable saturated solution;

[0056] (3) Pretreatment of aluminum-silicon-titanium composite oxide precursor

[0057] Using the molar ratio of Al / Si / Ti as 1:0.05:100, weigh 0.12g diaspore, 0.01g clay, and 19.87g titanium dioxide respectively, weigh out 0.06g diaspore and add 0.57g 50% hydrochloric acid solution Prepare acidic aluminum sol, dry-mix the remaining diaspore, clay...

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Abstract

The invention relates to a three-effect catalyst for removing NOx, CO, and HC for marine engines and a preparation method thereof. The catalyst uses cerium-tin-tungsten composite oxide as the active component of the catalyst, and contains cobalt, iron, nickel, copper, and lanthanum. One or more oxides among , molybdenum, manganese, zirconium, silver and yttrium are used as cocatalysts, and aluminum, silicon and titanium composite oxides are used as carriers. Stir the saturated active component solution, saturated cobalt promoter ion solution, strongly acidic aluminum glue, diaspore, clay, titanium dioxide, and organic molding agent together, mix, age, extrusion, dry, and roast A monolithic catalyst was prepared. The catalyst of the invention has high NOx removal efficiency, a wide active temperature window, and high low-temperature collaborative catalytic removal of CO and HC. The catalyst components are non-toxic, environmentally friendly, have high mechanical strength, excellent earthquake resistance, good thermal stability, simple preparation process and low cost. It is suitable for the treatment of NOx, CO and HC in ship diesel engine exhaust, and is also suitable for the treatment of diesel engine exhaust from other mobile sources such as automobiles.

Description

Technical field [0001] The invention relates to a three-effect NO removal for ship machinery x , CO and HC catalysts and preparation methods thereof belong to the field of environmental protection 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 Because a series of environmental problems such as acid rain endanger human life safety and living environment, the CO and HC produced by it can directly endanger human life and health, and people are paying more and more attention. "MARPOL 73 / 78 Convention" Annex VI stipulates that Tier 3 is implemented in 2016 against NO x Emission requirements will be more stringent. The "Commercial Inland Ship Engine Emission Control Standards" formulated by the European Union are more stringent than the control standards established by IMO, and it also imposes emission restrictions on CO, ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J23/30B01J23/888B01J23/50B01J23/889B01D53/94B01D53/56B01D53/62B01D53/72
CPCY02A50/20
Inventor沈岳松纵宇浩祝社民
Owner南京环福新材料科技有限公司