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Medium-low-temperature denitration catalyst with mesoporous cerium oxide as carrier and preparation method

A low-temperature denitrification and cerium oxide technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effects of easy operation, good application prospects, and simple preparation process

Active Publication Date: 2018-12-21
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

[0005] The present invention aims at the defects in the above-mentioned background technology, and the purpose of the present invention is to provide a medium-low temperature denitration catalyst and a preparation method using mesoporous cerium oxide as a carrier, so as to overcome the uneven distribution of active metal components in the denitration catalyst in the prior art, the temperature Narrow window, poor water resistance and sulfur resistance, etc., thus providing a method for preparing ordered mesoporous cerium oxide through a solvent-free method, and further supporting the active component manganese oxide and auxiliary tungsten trioxide

Method used

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  • Medium-low-temperature denitration catalyst with mesoporous cerium oxide as carrier and preparation method
  • Medium-low-temperature denitration catalyst with mesoporous cerium oxide as carrier and preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] (1) 1.833g of cerium acetylacetonate hydrate and 2g of CTAB surfactant were mixed, and ball milled for 30 minutes with a ball mill; the medicine after ball milling was transferred to a 50mL polytetrafluoroethylene reaction kettle, and 0.5mL was added with a concentration of 2mol / L After aging treatment at 180°C for 24 h, the NaOH solution was naturally cooled to room temperature; the mesoporous cerium oxide precursor in the reaction kettle was taken out and dried in an oven, and the dried precursor was placed in a muffle furnace for 1 The heating rate of °C / min was raised to 500 °C, and baked at this temperature for 5 hours to obtain a mesoporous cerium oxide support; the obtained mesoporous cerium oxide support was recorded as CeO 2 -CTAB-C1 (CeO 2 -CTAB-C1 stands for CeO made from hydrated cerium acetylacetonate and CTAB 2 ), the specific surface area of ​​the carrier is 161m 2 / g.

[0030] (2) Prepare the (NH 4 ) 6 h 2 W 12 o 40 ·yH 2 O solution, add equal m...

Embodiment 2

[0032] (1) 1.833g of cerium acetylacetonate hydrate and 1g of PVP surfactant were mixed, and ball milled for 30 minutes with a ball mill. Transfer the ball-milled medicine to a 50mL polytetrafluoroethylene reaction kettle, add 0.5mL NaOH solution with a concentration of 2mol / L, age at 100°C for 10h, and cool to room temperature naturally; take out the mesopores in the reaction kettle Place the cerium oxide precursor in an oven to dry, place the dried precursor in a muffle furnace, raise the temperature to 500°C at a heating rate of 2°C / min, and bake at this temperature for 2 hours to obtain mesoporous cerium oxide carrier. The obtained mesoporous cerium oxide support is denoted as CeO 2 -PVP-C1 (CeO 2 -PVP-C1 stands for CeO made from hydrated cerium acetylacetonate and PVP 2 ), the specific surface area of ​​the carrier is 183m 2 / g.

[0033] (2) Prepare (NH 4 ) 6 h 2 W 12 o 40 ·yH 2 O solution, add equal mass of oxalic acid to inhibit the hydrolysis of tungsten ion...

Embodiment 3

[0035] (1) 1.506g of cerium isopropoxide and 2g of CTAB surfactant were mixed, and ball milled for 30 minutes with a ball mill. Transfer the ball-milled medicine to a 50mL polytetrafluoroethylene reaction kettle, add 0.5mL NaOH solution with a concentration of 2mol / L, age at 120°C for 12h, and cool naturally to room temperature; take out the mesopores in the reaction kettle Place the cerium oxide precursor in an oven to dry, place the dried precursor in a muffle furnace, raise the temperature to 550°C at a rate of 1°C / min, and bake at this temperature for 3 hours to obtain mesoporous cerium oxide carrier. The obtained mesoporous cerium oxide support is denoted as CeO 2 -CTAB-C2 (CeO 2 -CTAB-C2 stands for CeO made of cerium isopropoxide and CTAB 2 ), the specific surface area of ​​the carrier is 134m 2 / g.

[0036] (2) Prepare (NH 4 ) 6 h 2 W 12 o 40 ·yH 2 O solution, add equal mass of oxalic acid to inhibit the hydrolysis of tungsten ions during the preparation proc...

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Abstract

The invention discloses a medium-low-temperature denitration catalyst with mesoporous cerium oxide as a carrier and a preparation method. According to the denitration catalyst, the mesoporous cerium oxide is utilized as the carrier, WO3 is utilized as an aid, MnOX is utilized an active ingredient, the mass fraction of the W is 5 to 8%, and the mass fraction of the Mn is 5 to 11%; the catalyst is marked as MnOX-WO3 / CeO2-S-C, wherein the S is equal to a surface active agent, and the C represents organic cerate of cerium acetylacetonate hydrate, cerium isopropoxide, 2-cerium ethylhexoic acid andthe like. According to the medium-low-temperature denitration catalyst disclosed by the invention, the ordered mesoporous aluminum oxide carrier prepared by a solvent-free method has the advantages ofgood ordered mesopores, larger specific surface area, controllable structure, easiness in operation, large-scale production and good application prospect; furthermore, the compound catalyst preparedfrom dipping has a good nitric oxide purifying rate and excellent sulfur resistance in a 100 to 350 DEG C temperature range.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control for environmental protection, in particular to a medium-low temperature denitrification catalyst with mesoporous cerium oxide as a carrier and a preparation method. Background technique [0002] Nitrogen oxides (NOx) are a major air pollutant. With the development of the national economy, the total emission of nitrogen oxides in our country is increasing year by year, and the pollution is becoming more and more serious, which poses a great threat to the ecological environment and human health. Among various NOx emission reduction control technologies, ammonia selective catalytic reduction of nitrogen oxides (Selective Catalytic Reduction of NOx byammonia, NH 3 -SCR) is considered to be one of the most effective technologies for removing NOx. V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 As a commercial catalyst has been widely used in NH 3 -In the SCR reaction, however, it still has a narrow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/34B01J2523/00B01J2523/3712B01J2523/69B01J2523/72
Inventor 陈建军张亚青李俊华高向平苗雪
Owner YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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