A kind of cerium-based denitrification catalyst and its preparation process

A denitration catalyst and oxide technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of narrow reaction temperature window and poor low temperature activity, etc. Achieve the effect of good low temperature reactivity and stability, enhanced water and sulfur resistance, and strong water and sulfur resistance

Active Publication Date: 2019-01-29
SHANGHAI ZOSUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The core of the technology is the catalyst, the current commercial V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Although the catalyst is very mature, it still has a narrow reaction temperature window, poor activity at low temperature, and easy formation of N at high temperature. 2 O by-products and main active components V 2 o 5 Biological toxicity and other defects

Method used

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  • A kind of cerium-based denitrification catalyst and its preparation process
  • A kind of cerium-based denitrification catalyst and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Dissolve cerium nitrate in deionized water, stir at room temperature for 10 minutes to dissolve completely, then add antimony trichloride and polyvinylpyrrolidone and continue stirring for 0.5h to fully mix to obtain a mixed solution, in which polyvinylpyrrolidone Accounting for 0.5wt% of the total weight of the metal precursor, the molar concentrations of cerium and antimony elements in the mixed solution are 0.1 mol / L and 0.1 mol / L, respectively;

[0027] 2) Add hexamethylenetetramine, which accounts for 2 times the total weight of the metal precursor, to the mixed solution obtained in step 1), stir it for 30 minutes to make it fully mixed, and then transfer it to a hydrothermal reaction kettle for 24 hours at 140°C. The cerium and antimony ions are fully and uniformly settled, and then naturally cooled to room temperature to obtain a mixture containing the precipitate, and the mixture containing the precipitate is filtered to obtain the primary precipitate;

[002...

Embodiment 2

[0032] 1) Dissolve cerium nitrate in deionized water, stir at room temperature for 20 minutes to completely dissolve, then add antimony acetate and morpholine and continue stirring for 3.0 hours to fully mix to obtain a mixed solution, in which morpholine accounts for the metal precursor 3.0wt% of the total weight, the molar concentrations of cerium and antimony elements in the mixed solution are 1mol / L and 2mol / L respectively;

[0033] 2) Add hexamethylenetetramine accounting for 5 times the total weight of the metal precursor to the mixed solution obtained in step 1), stir it for 60 minutes to make it fully mixed, and then transfer it to a hydrothermal reaction kettle for 12 hours at 200°C. The cerium and antimony ions are fully and uniformly settled, and then naturally cooled to room temperature to obtain a mixture containing the precipitate, and the mixture containing the precipitate is filtered to obtain the primary precipitate;

[0034] 3) Add 30% hydrogen peroxide to th...

Embodiment 3

[0038] 1) Dissolve ammonium cerium nitrate in deionized water, stir at room temperature for 12 minutes to completely dissolve, then add antimony trichloride and sodium dodecylbenzenesulfonate and continue to stir for 2.0 hours to fully mix to obtain a mixed solution , wherein sodium dodecylbenzenesulfonate accounts for 1.0wt% of the total weight of the metal precursor, and the molar concentrations of cerium and antimony elements in the mixed solution are 2 mol / L and 3 mol / L, respectively;

[0039]2) Add hexamethylenetetramine accounting for 3 times the total weight of the metal precursor to the mixed solution obtained in step 1), stir it for 40 minutes to make it fully mixed, and then transfer it to a hydrothermal reaction kettle for 22 hours at 160°C. The cerium and antimony ions are fully and uniformly settled, and then naturally cooled to room temperature to obtain a mixture containing the precipitate, and the mixture containing the precipitate is filtered to obtain the prim...

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Abstract

The invention discloses a novel cerium-base denitrification catalyst and a preparation technique thereof. The denitrification catalyst is metal composite oxides composed of cerium oxide and antimony oxide. The Ce and Sb oxides in the catalyst form a solid solution CeOx-SbOy, wherein the cerium / antimony mole ratio is 0.50-2.0; the cerium oxide is a Ce<3+>-Ce<4+> oxide mixture; and the antimony oxide is a Sb<3+>-Sb<5+> oxide mixture. The denitrification catalyst is prepared by a homogeneous coprecipitation process-hydrothermal process integrated treatment technique. The denitrification catalyst has excellent catalytic activity, N2 selectivity and SO2 poisoning resistance at 200-400 DEG C; and the adopted raw materials are nontoxic and harmless to the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis, and relates to a denitration catalyst, in particular to a cerium-antimony composite oxide denitration catalyst and a preparation process thereof. Background technique [0002] China is the world's largest coal producer and consumer. For a long time, my country's coal-based energy supply and consumption pattern will not change. During the combustion of coal, a large number of pollutants will be produced, mainly dust, SO 2 , nitrogen oxides and toxic trace elements. With the development and maturity of my country's desulfurization technology, dust emissions have also been effectively controlled, nitrogen oxides (NO x ) governance issues have gradually become the subject of current research. NO x It can cause acid rain, photochemical smog, decrease in stratospheric ozone and increase in near-surface ozone concentration, which in turn can cause great harm to the ecological environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01D53/86B01D53/56
CPCB01D53/56B01D53/565B01D53/8628B01D2258/0283B01J23/002B01J23/18
Inventor 王欧庭
Owner SHANGHAI ZOSUM ENG
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