Catalyst for purifying nitric oxide, and preparation method thereof

A technology of nitrogen oxides and catalysts, which is applied in the field of nano-catalysis, can solve the problem that the overall effect of nitrogen oxides purification is not very ideal, and achieve the effects of improving anti-SO2 poisoning performance, inhibiting SO2 poisoning, and improving oxygen storage capacity

Active Publication Date: 2012-07-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used carrier for nitrogen oxide purification is Al 2 o 3 , CeO 2 -ZrO 2 oxides or composite oxides, but their overall effect on the purification

Method used

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  • Catalyst for purifying nitric oxide, and preparation method thereof
  • Catalyst for purifying nitric oxide, and preparation method thereof
  • Catalyst for purifying nitric oxide, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] (1) In the present invention, a solution containing 1wt% Cu is prepared and loaded on the modified bauxite carrier in an equal volume at room temperature. After drying at 120°C, soaking in 3 ) 2 In the solution, the loading amount of Ba is 16wt%. After calcining at 400-550°C, catalyst 1 is obtained.

[0029] (2) Comparative sample Pt / Ba / Al 2 O 3 Preparation steps: (i) Al 2 O 3 Synthesis of: Al(NO 3 ) 3 ·9H 2 O is the raw material, dissolved in a certain amount of distilled water, with NH 3 ·H 2 O is a precipitant, centrifuged, dried, and roasted at 400-550°C. (ii) Load H separately 2 PtCl 6 ·6H 2 O and Ba(NO 3 ) 2 , The loading amounts are respectively: 1wt% and 16wt%, dried to take 20-30 mesh for use.

Example Embodiment

[0030] Example 2

[0031] (1) In the present invention, a solution containing 5wt% Cu is prepared and loaded on the modified bauxite carrier in an equal volume at room temperature. After drying at 120°C, soaking in 3 ) 2 In the solution, the loading amount of Ba is 16wt%. After calcining at 400-550°C, catalyst 2 is obtained.

[0032] (2) Comparative sample Pt / Ba / Al 2 O 3 Preparation steps: (i) Al 2 O 3 Synthesis of: Al(NO 3 ) 3 ·9H 2 O is the raw material, dissolved in a certain amount of distilled water, with NH 3 ·H 2 O is a precipitant, centrifuged, dried, and roasted at 400-550°C. (ii) Load H separately 2 PtCl 6 ·6H 2 O and Ba(NO 3 ) 2 , The loading amounts are respectively: 1wt% and 16wt%, dried to take 20-30 meshes for use.

Example Embodiment

[0033] Example 3

[0034] (1) The modified bauxite is heat treated at 130-170℃ for 48h, 30% H 2 O 2 Treat for 10-24h, wash with distilled water to PH=7, dry, and soak 5wt% Cu solution and 16wt% Ba(NO 3 ) 2 , Drying and roasting to obtain catalyst 3.

[0035] (2) Comparative sample Pt / Ba / Al 2 O 3 Preparation steps: (i) Al 2 O 3 Synthesis: Al(NO 3 ) 3 ·9H 2 O is the raw material, dissolved in a certain amount of distilled water, with NH 3 ·H 2 O is a precipitant, centrifuged, dried, and roasted at 400-550°C. (ii) Load H separately 2 PtCl 6 ·6H 2 O and Ba(NO 3 ) 2 , The loading amounts are respectively: 1wt% and 16wt%, dry, take 20-30 meshes for use.

[0036] The following will evaluate the performance of the example catalysts

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Abstract

The invention discloses a catalyst for purifying nitric oxide, and a preparation method of the catalyst. The catalyst comprises a bauxite carrier and one or more active ingredient(s) in transition metal ions such as Cu, Co and Mn or little precious metals such as Pt, Rh and Pd which is/are loaded on the bauxite carrier, wherein the weight of the active ingredient(s) is 1-10% of the total weight of the catalyst. The catalyst adopts one or more in alkali metals such as Li, Na, K and Rb or alkaline-earth metals such as Mg, Ca, Ba and Sr as accessory ingredient, and the weight of the alkali metal(s) and the alkaline-earth metal(s) is 10-30% of the total weight of the catalyst. The purification effect and the service life of the catalyst are superior to those of the traditional Pt/Ba/Al2O3 catalyst; and the catalyst is convenient to operate, low in cost and good in purification effect, and has obvious industrial application value.

Description

technical field [0001] The invention belongs to the field of nano-catalysis application, and in particular relates to the application of bauxite to the purification of nitrogen oxides in automobile tail gas and industrial waste gas. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmospheric environment, which can easily cause acid rain and photochemical smog, cause damage to humans and plants, and participate in the destruction of the ozone layer. Its sources mainly include two parts: active sources (exhaust gas emitted by motor vehicles) and stationary sources (exhaust gas from power plants and coal combustion). [0003] At present, nitrogen oxide purification catalysts mainly consist of three parts, namely catalyst carrier, active coating and catalytic active components. In order to improve the performance of the catalyst, a small amount of rare earth oxides and alkaline earth metal oxides are often added to the active coating and cata...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01D53/86B01D53/56
Inventor 王瑞虎王秀云洪茂椿
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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