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Metal oxide-vanadate/TiO2 catalyst and preparation method and application thereof

A technology of oxides and vanadates, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems restricting the application of catalysts, and achieve excellent resistance to H2O and anti-SO2 poisoning performance, high-efficiency removal, and simple preparation process

Active Publication Date: 2018-12-14
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, various transition metals such as CuO / CeO 2 -TiO 2 , Fe 2 o 3 / γ-Al 2 o 3 etc. are also applied to Hg 0 Oxidation of catalysts, but due to various economic and technical problems, the application of the above catalysts in actual industry is restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. In the presence of oxalic acid, mix cerium nitrate and 0.0425g ammonium metavanadate so that the molar ratio of Ce to V is 0.5;

[0059] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 75°C for 5h, while evaporating to remove water;

[0060] 3. Dry the slurry obtained in step 2 at 110°C for 3 hours;

[0061] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 120°C for 1h, then at 300°C for 1h, and then at 500°C for 3h to obtain V 2 o 5 -CeVO 4 / TiO 2 catalyst.

[0062] The results show that the catalyst of this example makes NO x The conversion rate reaches 89.87~97.52%, Hg 0 The oxidation efficiency reaches 73.65~98.61%.

[0063] Moreover, the conversion rate and oxidation efficiency of the catalyst in this embodiment were both maintained above 96-98% of the original level after 12 hours of continuous experimentation.

Embodiment 2

[0073] 1. In the presence of oxalic acid, mix lanthanum nitrate and 0.0425g ammonium metavanadate so that the molar ratio of La to V is 2;

[0074] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 180°C for 1 hour, and evaporated to remove water at the same time;

[0075] 3. Dry the slurry obtained in step 2 at 80°C for 24 hours;

[0076] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 140°C for 0.5h, then at 280°C for 1.5h, and then at 550°C for 2.5h to obtain La 2 o 3 -LaVO 4 / TiO 2 catalyst.

[0077] The results show that the catalyst of this example makes NO x The conversion rate reaches 85.3~97.6%, Hg 0 The oxidation efficiency reaches 72.64~90.35%.

[0078] In addition, the conversion rate and oxidation efficiency of the catalyst in this example were both maintained above 93-95% of the original level after 12 hours of continuous experimentation.

Embodiment 3

[0085] 1. In the presence of oxalic acid, mix cobalt nitrate and 0.0425g ammonium metavanadate so that the molar ratio of Co to V is 2.4;

[0086] 2. Add 5g of TiO to the mixed solution obtained in step 1 2 -WO 3 Carrier, stirred and impregnated at 150°C for 3h, while evaporating to remove water;

[0087] 3. Dry the slurry obtained in step 2 at 110°C for 3 hours;

[0088] 4. In an air atmosphere, the intermediate obtained in step 3 was first calcined at 100°C for 2h, then at 340°C for 1h, and then at 520°C for 2.5h to obtain Co 2 o 3 -CoVO 4 / TiO 2 catalyst.

[0089] The results show that the catalyst of this example makes NO x The conversion rate reaches 84.02~98.73%, Hg 0 The oxidation efficiency reaches 74.03~95.48%.

[0090] Moreover, the conversion rate and oxidation efficiency of the catalyst in this embodiment were both maintained above 95-97% of the original level after 12 hours of continuous experimentation.

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Abstract

The invention relates to the field of flue gas denitrification and mercury removal, and discloses a metal oxide-vanadate / TiO2 catalyst and a preparation method and application thereof. The catalyst comprises: TiO2, as well as a metal oxide and a vanadate which are supported on the TiO2, wherein the vanadate and the metal oxide supported on the TiO2 are formed by a vanadium source and a metal salt,and the cation of the vanadate is provided by a metal element in the metal salt. The metal oxide-vanadate / TiO2 catalyst can be used for high-efficiency removal of NOx and mercury in coal-fired flue gas, and particularly has very high removal efficiency for NOx and HgO.

Description

technical field [0001] The invention relates to the field of flue gas denitrification and mercury removal, in particular to a metal oxide-vanadate / TiO 2 Catalyst, a kind of preparation metal oxide-vanadate / TiO 2 Catalyst method and metal oxide-vanadate / TiO prepared by the method 2 Catalysts and metal oxides - vanadate / TiO 2 Application of catalyst in flue gas denitrification and mercury removal. Background technique [0002] NO x It is an important precursor that causes regional haze, acid rain, photochemical smog, etc., and is one of the main urban air pollutants. Mercury has attracted more and more attention from the international community because of its strong volatility, persistence, toxicity and bioaccumulation effect. Enhance coal NO x and mercury control is imminent. [0003] countries around the world to NO x On July 29, 2011, my country's Ministry of Environmental Protection issued the "Emission Standards of Air Pollutants for Thermal Power Plants" (GBl3223...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J23/847B01D53/86B01D53/56B01D53/64
CPCB01D53/8628B01D53/8665B01J23/22B01J23/8472B01D2258/0283B01D2257/602
Inventor 王红妍王宝冬孙琦徐文强林德海
Owner CHNA ENERGY INVESTMENT CORP LTD
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