Titanium oxide supported ferric vanadate catalyst, as well as preparation method and use thereof

Abstract

The invention relates to a titanium oxide supported ferric vanadate catalyst. The catalyst is composed of a TiO2 carrier, and a FeVO4 active constituent supported on the TiO2 carrier. In term of the mass of the catalyst as 100wt%, FeVO4 is 1.5-15 wt%, preferably 2.5-13.5 wt%, further preferably 8-10 wt%, and most preferably 9 wt%. According to the invention, the TiO2 supported FeVO4 catalyst is used for purifying fixed-source and movable-source nitric oxides in NH3-SCR (selective catalytic reduction) reaction for the first time; and moreover, the preparation method for the catalyst is simple and practicable, and easily realizes industrialized production. The FeVO4 / TiO2 catalyst disclosed by the invention is extremely excellent in anti-H2O-poisoning and anti-SO2-poisoning performances in the NH3-SCR reaction, and very suitable for practical application.

Description

technical field

[0001] The invention relates to a titanium oxide-supported iron vanadate catalyst, a preparation method and an application thereof, and the catalyst is used for NH of a fixed source and a mobile source 3 -SCR flue gas denitrification. Background technique

[0002] Nitrogen oxides (NO x ) mainly comes from the combustion of fossil fuels, such as flue gas from coal-fired power plants and motor vehicle exhaust. It is not only the main cause of acid rain, but also can react with hydrocarbons to form secondary pollution such as photochemical smog. It has become second only to inhalable The important air pollutants of particulate matter and sulfur dioxide have caused serious adverse effects on the ecological environment and human health.

[0003] with V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 As a catalyst, ammonia is used as a reducing agent to selectively catalytically reduce nitrogen oxides (Selective Catalytic Reduction of NO x with NH 3 ), namely NH 3 -SCR techn...

Examples

Embodiment 1

[0036] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage of is 9wt%.

[0037] The preparation method of described catalyst is:

[0038] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0039] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 120° C. for 12 hours, and calcined at 400° C. for 6 hours to obtain a titanium oxide-supported iron vanadate catalyst.

Embodiment 2

[0041] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage is 1.5wt%.

[0042] The preparation method of described catalyst is:

[0043] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0044] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 100° C. for 16 hours, and calcined at 350° C. for 10 hours to obtain a titanium oxide-supported iron vanadate catalyst.

Embodiment 3

[0046] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage is 15wt%.

[0047] The preparation method of described catalyst is:

[0048] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0049] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 140°C for 8 hours, and calcined at 450°C for 4 hours to obtain a titanium oxide-supported iron vanadate catalyst.

technical field

[0001] The invention relates to a titanium oxide-supported iron vanadate catalyst, a preparation method and an application thereof, and the catalyst is used for NH of a fixed source and a mobile source 3 -SCR flue gas denitrification. Background technique

[0002] Nitrogen oxides (NO x ) mainly comes from the combustion of fossil fuels, such as flue gas from coal-fired power plants and motor vehicle exhaust. It is not only the main cause of acid rain, but also can react with hydrocarbons to form secondary pollution such as photochemical smog. It has become second only to inhalable The important air pollutants of particulate matter and sulfur dioxide have caused serious adverse effects on the ecological environment and human health.

[0003] with V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 As a catalyst, ammonia is used as a reducing agent to selectively catalytically reduce nitrogen oxides (Selective Catalytic Reduction of NO x with NH 3 ), namely NH 3 -SCR techn...

Examples

Embodiment 1

[0036] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage of is 9wt%.

[0037] The preparation method of described catalyst is:

[0038] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0039] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 120° C. for 12 hours, and calcined at 400° C. for 6 hours to obtain a titanium oxide-supported iron vanadate catalyst.

Embodiment 2

[0041] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage is 1.5wt%.

[0042] The preparation method of described catalyst is:

[0043] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0044] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 100° C. for 16 hours, and calcined at 350° C. for 10 hours to obtain a titanium oxide-supported iron vanadate catalyst.

Embodiment 3

[0046] A kind of titanium oxide supported iron vanadate catalyst, described catalyst is made of anatase type TiO 2 Carriers and loads on TiO 2 FeVO on support 4 Active component composition, based on the mass of the catalyst as 100wt%, FeVO 4 The mass percentage is 15wt%.

[0047] The preparation method of described catalyst is:

[0048] (1) In the presence of oxalic acid, prepare a mixed solution of ferric nitrate and ammonium metavanadate, the molar ratio of the iron element in the ferric nitrate to the vanadium element in the ammonium metavanadate is 1:1;

[0049] (2) Add anatase TiO to the mixed solution obtained in step (1) 2 The carrier is impregnated, dried at 140°C for 8 hours, and calcined at 450°C for 4 hours to obtain a titanium oxide-supported iron vanadate catalyst.

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