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Catalyst for purifying natural gas vehicle exhaust and preparation method thereof

A technology for purifying catalysts and automobile exhaust, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of increased production costs, ammonia emissions, etc., to achieve reduced content, simple and economical preparation methods The effect of preparation costs

Active Publication Date: 2022-02-22
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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  • Catalyst for purifying natural gas vehicle exhaust and preparation method thereof
  • Catalyst for purifying natural gas vehicle exhaust and preparation method thereof
  • Catalyst for purifying natural gas vehicle exhaust 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 catalyst for purifying tail gas of natural gas vehicles and a preparation method thereof. Preparation methods include: La 0.67 Fe 0.83 Cu 0.17 o 3 Preparation of perovskite, Pd / Al 2 o 3 Preparation of materials, preparation of monolithic catalysts; catalyst components include Pd / Al 2 o 3 Catalyst and perovskite are mixed by ball milling at a ratio of 10 to 3:1, and perovskite is prepared by sol-gel method, mainly becoming La 0.67 Fe 0.83 Cu 0.17 o 3 . Under the condition of theoretical air-fuel ratio 1000ppm CH 4 , 5000ppm CO, 930ppm NO, 4035ppmO 2 , 10vol.%CO 2 ,5vol.%H 2 O, N 2 As a balance gas, the air velocity is 54000h ‑1 The activity test was carried out, and the content of ammonia in the tail gas was found to be kept below 10ppm during the temperature programming process of 300-500°C. The catalyst prepared by the method of the invention can reduce the content of ammonia in the tail gas of natural gas vehicles, and at the same time significantly reduce the content of other harmful components in the tail gas such as methane, carbon monoxide and nitrogen oxides.

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