Natural gas automobile tail gas purification catalyst and preparation method thereof

A technology for purifying catalysts and automobile exhaust gas, which is applied in the directions of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of increasing production costs, ammonia emissions, etc., and achieves a reduction in content, a concise preparation method, and economical The effect of preparation cost

Active Publication Date: 2021-01-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the latest pollutant emission limits and measurement methods for heavy-duty diesel vehicles (China's sixth phase) have stipulated the NH of heavy-duty vehicles 3 The emission limit (below 10ppm), in order to meet the existing National VI standard, the existing technology is basically to add an additional ammonia oxidation catalytic device (ASC) in the engine exhaust system, which will also increase the production cost appropriately , besides this, there is currently no other effective method in China to solve the problem of ammonia emissions in motor vehicle exhaust

Method used

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  • Natural gas automobile tail gas purification catalyst and preparation method thereof
  • Natural gas automobile tail gas purification catalyst and preparation method thereof
  • Natural gas automobile tail gas purification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] La 0.67 Fe 0.83 Cu 0.17 o 3 Preparation of perovskite:

[0026] (1) Weigh 29.012g (La(NO 3 ) 3 ·6H 2 O, 33.532g Fe(NO 3 )3 9H 2 O, 4.107Cu(NO 3 ) 2 2H 2 O was fully dissolved with 60ml deionized water.

[0027] (2) The solution obtained in step (1) was added into equimolar mass of citric acid, heated and stirred to dissolve, then stirred in a water bath at 98° C. for 12 h until the water was evaporated to dryness.

[0028] (3) The sample obtained in step (2) was calcined in a muffle furnace at 200°C for 1 h, and then calcined at 600°C for 8 h to obtain the perovskite compound La 0.67 Fe 0.83 Cu 0.17 o 3 .

[0029] Pd / Al 2 o 3 Preparation of materials:

[0030] (4) Properly dilute palladium nitrate solution (1.5wt% Pd), impregnate Al 2 o 3 powder, dried, and calcined at 550°C for 3h in a muffle furnace to obtain Pd / Al 2 o 3 powder catalyst.

[0031] Preparation of Monolithic Catalyst:

[0032] La 0.67 Fe 0.83 Cu 0.17 o 3 Powder and Pd / Al 2 o...

Embodiment 2

[0034] La prepared in the same steps as in Example 1 0.67 Fe 0.83 Cu 0.17 o 3 Perovskite and Pd / Al 2 o 3 Material.

[0035] Preparation of Monolithic Catalyst:

[0036] La 0.67 Fe 0.83 Cu 0.17 o 3 Powder and Pd / Al 2 o 3 The catalyst is mixed at a mass ratio of 5:1, and mixed with deionized water and binder to make a slurry, and the solid content of the slurry is controlled at 40%-45%, and evenly coated on Φ11mm*25mm / 400cpsi cordierite ceramic honeycomb On the substrate, control the loading amount of Pd to 1.7g / L, dry at 120°C for 8h, and bake in a muffle furnace at 550°C for 3h to obtain 5Pd / Al 2 o 3 -La 0.67 Fe 0.83 Cu 0.17 o 3 monolithic catalyst.

Embodiment 3

[0038] La prepared in the same steps as in Example 1 0.67 Fe 0.83 Cu 0.17 o 3 Perovskite and Pd / Al 2 o 3 Material.

[0039] Preparation of Monolithic Catalyst:

[0040] La 0.67 Fe 0.83 Cu 0.17 o 3 Powder and Pd / Al 2 o 3 The catalyst is mixed at a mass ratio of 3:1, and mixed with deionized water and binder to make a slurry, and the solid content of the slurry is controlled at 40%-45%, and evenly coated on Φ11mm*25mm / 400cpsi cordierite ceramic honeycomb On the substrate, control the loading amount of Pd to 1.7g / L, dry at 120°C for 8h, and bake in a muffle furnace at 550°C for 3h to obtain 3Pd / Al 2 o 3 -La 0.67 Fe 0.83 Cu 0.17 o 3 monolithic catalyst.

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Abstract

The invention discloses a natural gas automobile tail gas purification catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing the La0.67Fe0.83Cu0.17O3 perovskite, preparing the Pd/Al2O3 material, and preparing the monolithic catalyst. The catalyst component comprises a Pd/Al2O3 catalyst and perovskite, the Pd/Al2O3 catalyst and the perovskite aresubjected to ball milling mixing according to a ratio of 10-3:1, the perovskite is prepared through a sol-gel method, and the main component is La0.67Fe0.83Cu0.17O3. Under the theoretical air-fuel ratio condition, 1000ppm of CH4, 5000ppm of CO, 930ppm of NO, 4035ppm of O2, 10vol.% of CO2, 5vol.% of H2O and N2 are used as balance gas, an activity test is carried out at the air speed of 54000 h<-1>, and the content of ammonia in tail gas is always maintained below 10ppm in the temperature programming process of 300-500 DEG C. The catalyst prepared by the method disclosed by the invention can reduce the content of ammonia in the natural gas automobile tail gas, and obviously reduce the content of other harmful components such as methane, carbon monoxide and oxynitride in the tail gas.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and preparation, in particular to the technical field of research and preparation of automobile tail gas purification catalysts, in particular to a natural gas automobile tail gas purification catalyst and a preparation method thereof. Background technique [0002] Typical natural gas vehicle exhaust is gaseous emissions containing carbon monoxide (CO), unburned methane (CH 4 ) and nitrogen oxides (NO x ) and other ingredients inhomogeneous mixture. Typically, catalysts installed in the exhaust system of an engine already convert most of the exhaust gas components into harmless components. For example, the most widely used three-way catalyst (TWC) can significantly reduce carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ) emissions, but the use of the three-way catalyst will make the NO in the engine x partially converted to ammonia (NH 3 ) and discharged as seconda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/08B01J37/02B01D53/94B01D53/56B01D53/58B01D53/62B01D53/72F01N3/28
CPCB01J23/894B01J23/002B01J37/0036B01J37/088B01J37/0201B01J37/0215B01D53/945B01D53/9436F01N3/2803F01N3/2828B01J2523/00B01D2258/018F01N2570/14F01N2570/12F01N2570/10B01J2523/17B01J2523/31B01J2523/3706B01J2523/842Y02A50/20
Inventor 沈谱清钟琳陈耀强
Owner SICHUAN UNIV
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