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Iron cerium tungsten ternary composite oxide with high heat stability as well as synthesis and application thereof

A high thermal stability, ternary composite technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, chemical instruments and methods, etc., can solve problems such as narrow temperature window and poor thermal stability, Achieve the effects of wide operating temperature window, excellent thermal stability, simple preparation process and equipment

Inactive Publication Date: 2018-07-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the existing NH 3 -Shortcomings such as poor thermal stability and narrow temperature window in the iron-based catalyst system in SCR, the present invention provides an iron-cerium-tungsten composite oxide catalyst with high thermal stability and its synthesis for the first time, which can be used as diesel engine vehicle exhaust NO x Catalytic purification treatment

Method used

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  • Iron cerium tungsten ternary composite oxide with high heat stability as well as synthesis and application thereof
  • Iron cerium tungsten ternary composite oxide with high heat stability as well as synthesis and application thereof
  • Iron cerium tungsten ternary composite oxide with high heat stability as well as synthesis and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of ternary composite oxide: Weigh 9.0g of urea, add it into deionized water, and stir continuously for 1h under the condition of 20°C water bath; then add 1.21g of ferric nitrate nonahydrate and 3.908g of nitric acid hexahydrate to the urea solution in sequence Cerium and 0.74g of ammonium metatungstate were stirred continuously for 3 hours to form a uniform suspension; continued to stir for 24 hours in a water bath at 90°C, then the temperature of the water bath dropped to room temperature, and aged for 12 hours; °C for 12 hours, and finally the dried sample precursor was calcined in a muffle furnace at 700 °C for 5 h to obtain a powder catalyst A-700 °C.

Embodiment 2

[0024] According to the preparation method of the ternary composite oxide of the present invention in Example 1, other conditions remained unchanged, only the calcination temperature was changed to 500° C., and the calcination time was 5 hours to obtain the catalyst.

Embodiment 3

[0026] To better demonstrate the advantages of the ternary composite catalyst, it was compared with the binary composite oxide catalyst. According to the preparation method of the composite oxide of the present invention in Example 1, other conditions remained unchanged, only cerium nitrate hexahydrate was removed, and a catalyst C-700° C. was prepared. According to the preparation method of the composite oxide of the present invention in Example 2, other conditions remained unchanged, only cerium nitrate hexahydrate was removed, and the catalyst D-500°C was prepared.

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Abstract

The invention discloses iron cerium tungsten ternary composite oxide with high heat stability as well as synthesis and application thereof. The preparation method of a catalyst is a urea homogenous precipitation method, and comprises the following steps: salt corresponding an iron source, a cerium source and a tungsten source into a urea solution, continuously stirring for 6 to 36 hours under thecondition that the water bath temperature is 80 to 110 DEG C, centrifuging, drying and roasting to prepare the catalyst. When the catalyst prepared by the method is applied to ammonia selective catalytic reduction of nitric oxide, the catalyst has the characteristics of wide operating temperature window, high heat stability and the like, is suitable for a diesel engine automobile nitric oxide catalytic purification device, and has wide actual application prospect.

Description

technical field [0001] The invention is applied to the field of environmental catalysis and purification of gaseous pollutants, and relates to the synthesis of a ternary composite oxide of iron, cerium and tungsten with high thermal stability and its application in diesel engine vehicle exhaust nitrogen oxides (NO x ) to eliminate the application. Background technique [0002] In recent years, with the continuous advancement of my country's industrialization and urbanization process, the use of fossil energy and resource consumption have continued to increase, and the situation of air pollution has further deteriorated. In 2014, my country's industrial waste gas emissions were as high as 69.419 billion Nm 3 , compared to the year-on-year increase of 3.7% in 2013. of which NO x It is an important part of air pollutants in our country. The existence of this pollutant has seriously affected human health and the ecological environment. For example, fine particulate matter PM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/94B01D53/86B01D53/56
CPCB01D53/9413B01D2255/2065B01D2255/20738B01D2255/20776B01J23/002B01J23/888B01J2523/00B01J2523/3712B01J2523/69B01J2523/842Y02A50/20Y02T10/12
Inventor 曲振平王辉董世城
Owner DALIAN UNIV OF TECH
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