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Rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst and preparation method thereof

A composite oxide and cerium oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as wide temperature window denitrification performance, and achieve broadened The effect of active temperature window, increased content, increased specific surface area and surface oxygen content

Inactive Publication Date: 2018-12-14
YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the problem that the existing catalysts cannot have a wide temperature window and good denitrification performance, the present invention provides a method for preparing a rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst. In a wide temperature range of 200°C, the purification efficiency of nitrogen oxides is over 90%.

Method used

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  • Rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst and preparation method thereof
  • Rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst and preparation method thereof
  • Rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst and preparation method thereof

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Embodiment 1

[0030] (1) Synthesis of rod-shaped cerium oxide support: prepare a cerium nitrate solution with a concentration of 0.0444 mol / L, which is designated as solution 1; prepare a sodium hydroxide solution with a concentration of 8 mol / L, and let it cool naturally to room temperature, which is designated as solution 2. Add 70 mL of solution 2 dropwise to solution 1 so that the molar ratio of the two is 1:180, stir vigorously for 1 h, transfer to a polytetrafluoroethylene reactor with a volume of 100 mL, and age at 110°C for 12 h . After taking out the hydrothermal kettle and waiting for cooling, the obtained rod-shaped cerium oxide precursor was placed in an oven and dried at 60°C for 12 hours, then placed in a muffle furnace for roasting, and the temperature was raised to 450°C at a heating rate of 3°C / min, and Calcined at this temperature for 4h to obtain a rod-shaped cerium oxide carrier. The obtained rod-shaped cerium oxide support is denoted as CeO 2 -rod.

[0031] (2) Prepa...

Embodiment 2

[0033] (1) Synthesis of rod-shaped cerium oxide support: Prepare a cerium nitrate solution with a concentration of 0.05 mol / L, which is designated as solution 1; prepare a sodium hydroxide solution with a concentration of 9 mol / L, and let it cool naturally to room temperature, which is designated as solution 2. 70 mL of solution 2 was added dropwise to solution 1 so that the molar ratio of the two was 1:180. After stirring vigorously for 1 h, it was transferred to a 100 mL polytetrafluoroethylene reactor and aged at 100 °C for 24 h. After taking out the hydrothermal kettle and waiting for cooling, the obtained rod-shaped cerium oxide precursor was placed in an oven and dried at 60°C for 12 hours, then placed in a muffle furnace for roasting, and the temperature was raised to 500°C at a heating rate of 1°C / min, and Calcined at this temperature for 3h to obtain a rod-shaped cerium oxide carrier. The specific surface area of ​​the carrier is 90.13m 2 / g.

[0034] (2) Preparatio...

Embodiment 3

[0037] (1) Synthesis of rod-shaped cerium oxide support: Prepare a cerium nitrate solution with a concentration of 0.05 mol / L, which is designated as solution 1; prepare a sodium hydroxide solution with a concentration of 9 mol / L, and let it cool naturally to room temperature, which is designated as solution 2. 70 mL of solution 2 was added dropwise to solution 1 so that the molar ratio of the two was 1:180. After stirring vigorously for 1 h, it was transferred to a polytetrafluoroethylene reactor with a volume of 100 mL, and aged at 100 °C for 24 h. After taking out the hydrothermal kettle and waiting for cooling, the obtained rod-shaped cerium oxide precursor was placed in an oven and dried at 80°C for 24 hours, then placed in a muffle furnace for roasting, and the temperature was raised to 550°C at a heating rate of 1°C / min, and Calcined at this temperature for 2h to obtain a rod-shaped cerium oxide carrier.

[0038] (2) Preparation of catalyst: Weigh 0.1773g of samarium(II...

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Abstract

The invention relates to a preparation method of a rod-shaped cerium oxide-supported samarium-manganese composite oxide catalyst. The method comprises: S01, carrier preparation: a, mixing a cerium nitrate hexahydrate solution and a sodium hydroxide solution through stirring to obtain a first mixed solution, b, transferring the first mixed solution into a reactor and carrying out high temperature treatment and c, carrying out high temperature roasting on a sample subjected to high temperature treatment to obtain a rod-shaped cerium oxide carrier, and S02, catalyst preparation: d, preparing a second mixed solution of samarium nitrate and manganese nitrate, e, dipping the rod-shaped cerium oxide carrier in the second mixed solution and f, carrying out high temperature roasting on the soaked sample to obtain an oxidation state catalyst. The catalyst is in a wide temperature range of 100-200 DEG C and the purification efficiency of nitrogen oxide is 90% or more.

Description

technical field [0001] The invention relates to a chemical product and a preparation method of the chemical product, in particular to a samarium-manganese composite oxide catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the main sources of air pollution, which can not only cause photochemical smog, acid rain, ozone depletion, greenhouse effect and other ecological problems, but also endanger human health. Therefore, the reduction and control of nitrogen oxides has become a research hotspot and focus in the field of global air pollution prevention and control. [0003] Ammonia Selective Catalytic Reduction (NH3-SCR) denitrification method is currently the most researched, widely used, and most effective NOx removal technology. The core of SCR denitrification technology is denitrification catalyst, and the most widely used catalyst in industry is V2O5-WO3(MoO3) / TiO2 catalyst. However, the V2O5-WO3(MoO3) / TiO2 catalyst h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01J23/34B01J2523/00B01J2523/3712B01J2523/3737B01J2523/72
Inventor 陈建军张亚青李俊华于双江
Owner YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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