A kind of vehicle diesel engine exhaust no x , CO, HC purification catalyst and preparation method thereof

A technology for purifying catalysts and diesel engines, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve breathing difficulties, reduce lung resistance to infectious diseases, cause cancer and other problems, to achieve the effect of simple preparation process, excellent seismic performance and good thermal stability.

Active Publication Date: 2018-01-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Incomplete combustion of HC can cause anemia, neurasthenia, cause breathing difficulties and reduce the resistance of the lungs to infectious diseases, and the polycyclic aromatic hydrocarbons contained in hydrocarbons have a huge carcinogenic effect, and long-term exposure can induce lung cancer, gastric cancer and skin cancer. cancer

Method used

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  • A kind of vehicle diesel engine exhaust no <sub>x</sub> , CO, HC purification catalyst and preparation method thereof
  • A kind of vehicle diesel engine exhaust no <sub>x</sub> , CO, HC purification catalyst and preparation method thereof
  • A kind of vehicle diesel engine exhaust no <sub>x</sub> , CO, HC purification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of manganese, molybdenum, tungsten compound ion solution

[0039] With the molar ratio of Mn / Mo / W being 1 : 0.06 : 0.1, weigh 9.04g manganese nitrate, 0.27g ammonium molybdate hexahydrate, and 0.67g ammonium metatungstate respectively, and dissolve them in lemon with a mass concentration of 1%. In the acid solution, a stable saturated solution of manganese, molybdenum and tungsten is prepared by stirring evenly;

[0040] (2) Preparation of cocatalyst precursor ion solution

[0041] Screen and weigh 0.025g ferric nitrate, dissolve it in 1% nitric acid, and prepare a uniform and stable saturated solution through stirring;

[0042] (3) Pretreatment of titanium and silicon composite oxide precursors

[0043] Be 9: 1 with Ti / Si element mass ratio, take by weighing 22.50g titanium dioxide, 2.50g clay respectively, dry mix evenly;

[0044] (4) Preparation and pretreatment of catalyst sludge

[0045] According to the catalyst carrier / cocatalyst / catalytically a...

Embodiment 2

[0052] (1) Preparation of manganese, molybdenum and tungsten composite solution

[0053] With the molar ratio of Mn / Mo / W as 1 : 0.01 : 0.05, weigh 10.74g manganese chloride, 0.05g ammonium molybdate hexahydrate, and 0.40g ammonium metatungstate respectively, and dissolve them in 1% mass concentration In the acetic acid solution, a stable saturated solution of manganese, molybdenum and tungsten was prepared by uniform stirring;

[0054] (2) Preparation of cocatalyst precursor ion solution

[0055] Screen and take by weighing 0.125g ferric chloride and 0.125g nickel chloride, be dissolved in the hydrochloric acid solution that mass concentration is 1%, configure stable saturated solution evenly through stirring;

[0056] (3) Pretreatment of titanium and silicon composite oxide precursors

[0057] With Ti / Si element mass ratio as 10: 1, take by weighing 22.72g titanium dioxide, 2.27g clay respectively, dry mix evenly;

[0058] (4) Preparation and pretreatment of catalyst sludg...

Embodiment 3

[0066] (1) Preparation of manganese, molybdenum and tungsten composite solution

[0067] With the molar ratio of Mn / Mo / W as 1 : 0.01 : 0.1, weigh 9.62g of manganese acetate, 0.05g of ammonium molybdate hexahydrate, and 0.71g of ammonium metatungstate, and dissolve them in 0.5% lemon acid and 0.5% acetic acid mixed solution (the volume ratio of the two is 1:2), and the stable saturated solution of manganese, molybdenum and tungsten is prepared by uniform stirring;

[0068] (2) Preparation of cocatalyst precursor ion solution

[0069] Screen and weigh 0.25g of yttrium nitrate, 0.125g of zirconium oxychloride and 0.375g of neodymium nitrate, dissolve in a nitric acid solution with a mass concentration of 1%, and evenly configure a stable saturated solution after stirring;

[0070] (3) Pretreatment of titanium and silicon oxide precursors

[0071] With Ti / Si element mass ratio being 7: 1, take by weighing 21.88g titanium dioxide, 3.12g clay respectively, dry mix evenly;

[0072...

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Abstract

The invention relates to a catalyst for purifying diesel engine tail gas NOX, CO and HC for a vehicle and a preparation method thereof. The catalyst is characterized in that a Mn-Mo-W-Ox composite oxide serves as a catalyst active component, one or more of Co, Fe, Ni, Cu, La, Nd, Zr or Y oxides serve as promoters, and a Ti-Si-Oy composite oxide serves as a carrier; carrier mass serves as a standard, the mass percentage content of the catalyst active component is 5-18%, and the mass percentage content of the promoters is 0.1-8%. The preparation method includes the steps that saturated manganese molybdenum tungsten composite ionic liquid, a catalysis-assisting ionic solution, titanium dioxide, clay and an organic forming agent are evenly stirred, mixed, aged, extruded, formed, dried and roasted to prepare the monolith catalyst. The catalyst is environmentally friendly, low-temperature SCR NOx removal efficiency is high, the activation temperature window range is wide, CO and HC catalytic oxidation efficiency is high, cost is low, mechanical strength is high, anti-shock performance is good, and the preparation technology is simple. The catalyst is preferentially suitable for purification of diesel engine tail gas NOx, CO and HC for the vehicle and is also suitable for diesel engine tail gas purification of ships and other moving sources.

Description

technical field [0001] The invention relates to a vehicle diesel engine NO x , CO, HC purifying catalyst and a preparation method thereof, belonging to the fields of environmental protection catalytic materials and air pollution control. Background technique [0002] Due to the high power of the diesel engine, low energy consumption, good economic performance, and CO 2 The emissions of gasoline engines are 20%~30% less than that of gasoline engines, so they play an increasingly important role in the automotive field. According to the statistics of China Industrial Automobile Association, in 2009, the national sales of diesel engines was 3.06 million units, and in 2010, the sales volume was 3.99 million units, a year-on-year increase of 30.36%. [0003] The main pollutants in diesel engine exhaust are: nitrogen oxides (NO x ), hydrocarbons (HC), carbon monoxide (CO) and suspended particles (particulate matter; PM). Among them, NO x It will promote the formation of photoc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J23/889B01J23/34B01D53/86B01D53/56B01D53/62B01D53/72
CPCB01D53/865B01D2255/40B01D2255/65B01D2258/012B01J23/002B01J23/34B01J23/8898B01J2523/00B01J2523/41B01J2523/47B01J2523/68B01J2523/69B01J2523/72B01J2523/842B01J2523/847B01J2523/36B01J2523/3725B01J2523/48B01J2523/17B01J2523/3706B01J2523/845Y02A50/20
Inventor眭国荣韩冰沈岳松许仲梓沈晓冬祝社民沈树宝
OwnerNANJING TECH UNIV