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Catalyst for simultaneously removing nitrogen oxide and CO in automobile exhaust

A technology of automobile exhaust and nitrogen oxides, which is applied in the field of pollution control and can solve the problem of high catalyst cost and achieve the effect of reducing production cost

Inactive Publication Date: 2008-08-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the currently used noble metal three-way catalyst has the disadvantage of high catalyst cost.

Method used

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  • Catalyst for simultaneously removing nitrogen oxide and CO in automobile exhaust
  • Catalyst for simultaneously removing nitrogen oxide and CO in automobile exhaust
  • Catalyst for simultaneously removing nitrogen oxide and CO in automobile exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using cerium nitrate as raw material, carrier CeO 2 Three methods were used to prepare:

[0025] (1)Ce(NO 3 ) 3 · 6H 2 O was calcined in a muffle furnace at 600 °C for 4 hours, and the obtained sample was named CeO 2 (1). (2) Preparation of cerium oxide by ammonia precipitation: take a certain amount of Ce(NO 3 ) 3 · 6H 2 O is made into a 0.05M solution and added to a 500ml round-bottomed flask, and at room temperature, in the constantly stirring solution, dropwise adding ammoniacal liquor with a concentration of 26 to 28wt.% to PH=10, reacted at room temperature for 10 hours, filtered, Wash until pH2 (2).

[0026] (3) Preparation of cerium oxide by uniform precipitation method: we use different molar concentration ratios of Ce(NO 3 ) 3 · 6H 2 O and urea aqueous solution as raw materials to prepare CeO 2 (where Ce(NO 3 ) 3 · 6H 2 O solution is selected as 0.05M), and finally optimizes its molar concentration ratio to be the best when it is 1:6. The p...

Embodiment 2

[0032] In Example 1 4wt%Ag / CeO 2 On the basis of introducing 0.4wt% Co in the same way, the resulting 4%Ag-0.4%Co / CeO 2 Catalyst activity vs. 4%Ag / CeO 2 and 0.4% Co / CeO 2 Catalyst activity comparison results are shown in the attached figure 1 And attached figure 2 (reaction conditions such as example 1).

Embodiment 3

[0034] Get the 4%Ag-0.4%Co / CeO prepared in example 2 2 Catalyst 100mg is loaded into a miniature fixed-bed reactor under normal pressure. Pretreatment in He flow at 500°C for 1 hour, and then lower the temperature to below 100°C. Respectively feed reaction gas 2500ppm NO+2500ppm CO+He and oxygen-containing reaction gas 2500ppm NO+5000ppm O 2 +12500ppm CO+He, flow rate 75ml / min, activity comparison results are shown in the attachment image 3 And attached Figure 4 .

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Abstract

The present invention relates to pollutant controlling technology, and is one high efficiency and low cost non-noble metal catalyst for replacing available noble metal catalyst used in automobile to remove NOx and CO simultaneously from tail gas. The catalyst includes Ag as main catalyst component and Co as co-catalyst component loaded on CeO2 carrier, and is prepared through homogeneous precipitating process with urea as precipitant. It has optimal Ag and Co loading amount of 4 wt% and 0.4 wt% separately. The catalyst has low cost and can remove NOx and CO simultaneously at relatively low window temperature of 200-500deg.c.

Description

technical field [0001] The invention belongs to the field of pollution control and technology. It involves replacing the three-way noble metal catalyst currently used in automobile exhaust purification with an efficient and cheap non-precious metal catalyst, especially a catalyst for simultaneously removing nitrogen oxides and carbon monoxide in automobile exhaust. Background technique [0002] Car exhaust contains carbon monoxide (CO), nitrogen oxides (NO x ), hydrocarbons (HC) and other harmful substances not only cause extremely serious pollution to the atmosphere, but also directly affect people's health. According to statistics, the amount of CO emitted per thousand vehicles per day is about 3000Kg, HC is about 200~400Kg, NO x 50~150Kg. With the improvement of people's living standards, people's requirements for the quality of the living environment are also increasing day by day, so the problem of controlling environmental pollution has become the focus of governmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/94B01D53/60
CPCY02A50/20
Inventor 石川朱爱民杨学锋徐勇张洪艳
Owner DALIAN UNIV OF TECH
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