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Preparation method of low-temperature cerium zirconium oxide loaded NOx catalyst

A cerium-zirconium oxide and catalyst technology, which is applied in the field of preparation of oxide-supported NOx storage and reduction catalysts, can solve problems such as insufficient low-temperature activity, and achieve good NOx storage and low-temperature catalytic performance, excellent low-temperature activity, and good catalytic performance. Effect

Inactive Publication Date: 2018-06-29
NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst still has the disadvantage of insufficient low-temperature activity, and is not suitable for the working conditions of low exhaust gas temperature during cold start of diesel vehicles.

Method used

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  • Preparation method of low-temperature cerium zirconium oxide loaded NOx catalyst
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  • Preparation method of low-temperature cerium zirconium oxide loaded NOx catalyst

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Embodiment

[0023] In this example, the low-temperature cerium-zirconium oxide-supported NO x The preparation method of catalyst, its chemical formula of catalyst is Pt / BaO / Ce x Zr (1-x) o 2 , its preparation method comprises the following steps: Ce x Zr (1-x) o 2 Preparation of nanomaterial carrier; based on nanomaterial carrier, BaO / Ce x Zr (1-x) o 2 Preparation of composite oxides; based on composite oxides, Pt / BaO / Ce x Zr (1-x) o 2 The preparation of the catalyst, wherein Ce x Zr (1-x) o 2 During the preparation of nanomaterial carriers, the Ce source and the Zr source molar ratio as raw materials are adjusted to adjust the Ce x Zr (1-x) o 2 Composition of nanomaterial carriers.

[0024] Different from the above examples, Ce x Zr (1-x) o 2 During the preparation of the nanomaterial support, the molar ratio range (0:1)-(1:0) of Ce and Zr of the Ce source and the Zr source is adjusted, so that the catalyst Pt / BaO / Ce x Zr (1-x) o 2 The value range of x in is 0-1.

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Abstract

The invention discloses a preparation method of a low-temperature cerium zirconium oxide loaded NOx catalyst. The chemical formula of the catalyst is Pt / BaO / CexZr(1-x)O2. The preparation method comprises the following steps: preparing a CexZr(1-x)O2 nanometer material carrier; preparing BaO / CexZr(1-x)O2 composite oxide based on the nanometer material carrier; and preparing a Pt / BaO / CexZr(1-x)O2 catalyst based on the composite oxide. The catalyst with different cerium and zirconium element composition is obtained by regulating and controlling the molar ratio of the Ce source to the Zr source inthe preparation process, and the low-temperature activity is obviously improved, so that the catalyst with high low-temperature activity is obtained in NOx treatment of tail gas of a lean burning engine (a light gasoline engine and a diesel engine), the activity temperature window of the catalyst is widened and the low-temperature activity of the catalyst is improved.

Description

technical field [0001] The invention relates to an oxide-loaded NO x Preparation method of storage reduction catalyst, especially a low-temperature cerium-zirconium oxide-supported NO x A method for preparing a catalyst, specifically a cerium-zirconium oxide-supported NO with improved low-temperature activity x A method for the preparation of a storage reduction catalyst. Background technique [0002] Lean-burn engines (light-duty gasoline and diesel engines) because of their high fuel economy and low CO 2 emissions have received much attention. However, a large amount of NO in the exhaust x Not only can it cause environmental problems such as photochemical smog and acid rain, but it also seriously threatens human health. So how to remove lean burn engine NO x Exhaust gas is a hot spot in the field of environmental catalysis. NO x Storage-reduction (NSR) technology has become the most practical and promising NO solution because it does not require additional reducing...

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Application Information

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IPC IPC(8): B01J23/63B01D53/94
CPCB01D53/9422B01D2258/012B01J23/002B01J23/63B01J2523/00B01J2523/25B01J2523/3712B01J2523/48
Inventor 贺泓张燕余运波单文坡李要彬连志华邓华
Owner NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI