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Catalyst for concurrently and efficiently removing soot and NOx under oxygen-enriched, sulfur-containing and water-containing conditions, and preparation method thereof

The technology of a catalyst and a precious metal catalyst is applied in the field of simultaneous efficient removal of soot and NOx from diesel vehicle exhaust gas and the field of catalyst preparation thereof, and achieves the effects of high sulfur resistance and water resistance and high application value.

Inactive Publication Date: 2015-02-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Existing technical solutions are still difficult to efficiently remove soot and NO from diesel vehicle exhaust at the same time under the condition of oxygen-rich, sulfur-containing and water-containing conditions x

Method used

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  • Catalyst for concurrently and efficiently removing soot and NOx under oxygen-enriched, sulfur-containing and water-containing conditions, and preparation method thereof
  • Catalyst for concurrently and efficiently removing soot and NOx under oxygen-enriched, sulfur-containing and water-containing conditions, and preparation method thereof
  • Catalyst for concurrently and efficiently removing soot and NOx under oxygen-enriched, sulfur-containing and water-containing conditions, and preparation method thereof

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Embodiment 1

[0041] Embodiment 1 Catalyst of the present invention and preparation method thereof

[0042] A soot and NO x Simultaneously, the catalyst is efficiently removed, comprising: preparing two kinds of precious metals loaded on the catalyst support by an equal-volume impregnation method, and the total mass fraction of the precious metals is 1%.

[0043] Among them, a precursor of the double noble metal catalyst is H 2 IrCl 6 ·6H 2 O, another precursor is H 2 PtCl 6 ·6H 2 O, RhCl 3 ·nH 2 O, AgNO 3 , Pd(NH 4 )NO 3 、RuCl 3 ·3H 2 O or HAuC 4 4H 2 O, the two noble metals were supported on the catalyst support ZrO by the equal volume impregnation method 2 Above, the total mass fraction of precious metals is 1%, the weight ratio range R of double precious metals is 5:5, and the loading sequence is simultaneous loading.

[0044] The catalyst was prepared by the equal volume impregnation method. The double precious metal was impregnated on the catalyst carrier, and after st...

Embodiment 2

[0046] Embodiment 2 Catalyst of the present invention and preparation method thereof

[0047] According to the catalyst composition and preparation method thereof of the embodiment, the carrier is replaced by TiO 2 、Al 2 o 3 , ZSM-5 or SiO 2 .

[0048] Using the catalyst evaluation method of the present invention, Ru-Ir loads different supports to simultaneously remove carbon particles and NO X Time CO X and NO X The TPR curves of figure 2 and 3 As shown, it can be seen that the dual-catalyst supports have good removal effects, and TiO 2 The carrier is optimal and has the best removal effect.

Embodiment 3

[0049] Embodiment 3 Catalyst of the present invention and preparation method thereof

[0050] According to the catalyst composition and preparation method thereof in the embodiment, the weight ratio R of Ru to Ir is replaced by 1:1, 3:7, 5:5, 7:3 respectively.

[0051] Using the catalyst evaluation method of the present invention, different Ru-Ir loading weight ratios R simultaneously remove carbon particles and NO X Time CO X and NO X The TPR curves of Figure 4 and 5 As shown, it can be seen that the weight ratio of Ru to Ir mentioned above has a good removal effect in the range of 1:1-9:1, and the weight ratio of Ru to Ir is 9:1, which has the best removal effect.

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Abstract

The present invention provides a catalyst for concurrently and efficiently removing soot and NOx under oxygen-enriched, sulfur-containing and water-containing conditions, and a preparation method thereof. According to the catalyst, two noble metals are loaded on a certain carrier according to a certain ratio and a certain loading sequence. According to the present invention, with the catalyst, soot and NOx can be concurrently removed under the oxygen-enriched condition, the soot oxidation temperature can be substantially reduced and the high NOx removing rate can be maintained under the oxygen-enriched, sulfur-containing and water-containing condition; and the catalyst has characteristics of high sulfur resistance and high water resistance, and is diesel vehicle tail gas pollutant purification material having the high application value.

Description

technical field [0001] The invention relates to the technical field of motor vehicle tail gas purification, in particular to a method for soot and NO in diesel vehicle tail gas x Simultaneously, the catalyst is efficiently removed and the preparation method thereof. Background technique [0002] Since the diesel engine is combusted under oxygen-rich conditions, the exhaust gas is rich in oxygen, so the traditional three-way catalyst is not suitable, which makes soot and nitrogen oxides (NO x ) emission has always been the focus and difficulty of diesel vehicle exhaust control. Since Yoshida et al. proposed "soot-O 2 -NO” reaction between the three components, the reduction of nitrogen oxides (NO x ) has aroused widespread concern. [0003] Many researchers have studied perovskite (ABO 3 ) and spinel type (AB 2 o 4 ) composite oxides remove soot and NO simultaneously under oxygen-enriched conditions x possibility, it was found that the system is effective for catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J29/44B01D53/94B01D53/56
Inventor 朱荣淑王俊佳闫庆允姚泽
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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