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Exhaust gas purification catalyst and process for manufacturing same

A technology of exhaust gas purification and catalyst, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as resource depletion, achieve inhibition of fusion, high NOx reduction activity, and improvement of NOx reduction activity Effect

Inactive Publication Date: 2016-07-20
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the use of these platinum group elements is increasing due to the strengthening of automobile exhaust gas regulations, so there is concern about resource depletion

Method used

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  • Exhaust gas purification catalyst and process for manufacturing same
  • Exhaust gas purification catalyst and process for manufacturing same
  • Exhaust gas purification catalyst and process for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] [NiO-CeO 2 Preparation of composite material (Ni1Ce9: load Ni content 10mol%)]

[0135] First, 750 mg (3 mmol) of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) with 11.7g (27mmol) of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) Add to a 1000mL beaker and dissolve with 225mL of distilled water (solution 1). Next, 4.4 g (12 mmol) of cetyltrimethylammonium bromide (CTAB) was added to a 500 mL beaker, and it was completely dissolved in 150 mL of distilled water (solution 2). Next, solution 2 was added to solution 1 and stirred at room temperature for 2 hours. While vigorously stirring the solution, about 60 mL of 1M aqueous NaOH was rapidly added to the solution to adjust the pH to 9.5.

[0136] Next, after stirring the obtained gel-like solution at room temperature for 4 hours, it was placed in a reaction tank made of Teflon, and hydrothermal treatment was performed at 120° C. for 24 hours. Next, after cooling to room temperature, the obtained solution w...

Embodiment 2

[0138] [NiO-CeO 2 Preparation of composite material (Ni2Ce8: load Ni content 20mol%)]

[0139] Except that 1.49g (6mmol) of nickel acetate tetrahydrate and 10.4g (24mmol) of cerium nitrate hexahydrate were added to a 1000mL beaker and dissolved with 225mL of distilled water, the same operation was performed as in Example 1 to obtain 2 A catalyst for exhaust gas purification of a composite material (Ni2Ce8: loaded with a Ni content of 20 mol%).

Embodiment 3

[0141] [NiO-CeO 2 Preparation of composite material (Ni4Ce6: load Ni content 40mol%)]

[0142] Except that 2.99g (12mmol) of nickel acetate tetrahydrate and 7.82g (18mmol) of cerium nitrate hexahydrate were added to a 1000mL beaker and dissolved with 225mL of distilled water, the same operation was performed as in Example 1 to obtain 2 A catalyst for exhaust gas purification of a composite material (Ni4Ce6: loaded with a Ni content of 40 mol%).

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Abstract

Provided are: an exhaust gas purification catalyst which contains a nanocomposite obtained by mixing CeO2 with NiO homogeneously; and a process for manufacturing the same. The homogeneous mixing satisfies: (a) when the nanocomposite is analyzed using an STEM-EDX at five or more measuring points which are selected at random and at which both Ce and Ni are detected, at the majority of the measuring points, the number of Ni atoms accounts for 3 to 20 atm% of the total number of Ni atoms and Ce atoms; and / or (b) in the Fourier transform of Ni K-edge EXAFS spectrum of the nanocomposite, the intensity ratio of the peak that is assignable to Ni-O and that appears near an interatomic distance of 1.8 <angstrom> to the peak that is assignable to Ni-Ni and that appears near an interatomic distance of 2.6 <angstrom> is 1:0.50 to 1:less than 2.18.

Description

technical field [0001] The present invention relates to an exhaust gas-purifying catalyst and a method for producing the same, and more specifically, to an exhaust gas-purifying catalyst containing nickel as a catalyst component and a method for producing the same. Background technique [0002] Carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ) and other harmful ingredients. Therefore, an exhaust gas purification device for decomposing and removing these harmful components is generally installed in the vehicle, and these harmful components are rendered harmless by an exhaust gas purification catalyst disposed in the exhaust gas purification device. Conventionally, as such an exhaust gas purification catalyst, a catalyst that simultaneously oxidizes CO and HC in the exhaust gas and NO x The reduction of the three-way catalyst, specifically, is widely known to make noble metals, especially platinum (Pt), rhodium (Rh), palladium (Pd) and other platinum group ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/94B01J37/03B01J37/04B01J37/10F01N3/10B01J35/00
CPCB01J37/10B01J23/83B01D53/945B01D2255/2065B01D2255/20753B01D2255/65B01D2258/012F01N2370/02B01J37/036B01J37/0018B01J37/0036Y02T10/12B01J35/393B01J35/613B01J2235/15B01J2235/30B01J35/70B01J35/45B01J35/77B01J2235/00B01J35/19B01J35/23B01J35/30B01J35/40B01J23/10B01J23/755B01J37/04
Inventor 永田直人小野公靖
Owner TOYOTA JIDOSHA KK