V-W-Ti oxide catalyst, preparation method and application thereof

An oxide and catalyst technology, applied in the field of vanadium-tungsten-titanium oxide catalyst and its preparation, achieves the effects of wide operating temperature window, excellent low-temperature activity, and large variation in exhaust gas temperature

Inactive Publication Date: 2016-12-07
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although the catalyst prepared by this method is resistant to

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  • V-W-Ti oxide catalyst, preparation method and application thereof
  • V-W-Ti oxide catalyst, preparation method and application thereof
  • V-W-Ti oxide catalyst, preparation method and application thereof

Examples

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[0050] Example 1

[0051] A vanadium-tungsten-titanium oxide catalyst comprising the following components according to mass percentage: 9% vanadium pentoxide, 12% tungsten trioxide, and 79% titanium dioxide; the vanadium pentoxide, tungsten trioxide and titanium dioxide are uniformly mixed And the crystal grain sizes of vanadium pentoxide, tungsten trioxide and titanium dioxide are independently 1-15nm.

[0052] The preparation method of the vanadium tungsten titanium oxide catalyst includes the following steps:

[0053] Ammonium metavanadate was used as vanadium source, ammonium tungstate was used as tungsten source, titanium sulfate was used as titanium source, oxalic acid was used as cosolvent, and urea was used as slow-release precipitation agent.

[0054] Add ammonium metavanadate, ammonium tungstate and sulfuric acid to the solvent containing the co-solvent (the mass of oxalic acid is the sum of the mass of ammonium metavanadate and ammonium tungstate) according to the molar rat...

Example Embodiment

[0055] Example 2

[0056] A vanadium-tungsten-titanium oxide catalyst comprising the following components according to mass percentage: 8% vanadium pentoxide, 21% tungsten trioxide and 71% titanium dioxide; the vanadium pentoxide, tungsten trioxide and titanium dioxide are uniformly mixed And the crystal grain sizes of vanadium pentoxide, tungsten trioxide and titanium dioxide are independently 1-15nm.

[0057] The preparation method of the vanadium tungsten titanium oxide catalyst is:

[0058] Other conditions remain unchanged as in Example 1, and the molar ratio of V:W:Ti is changed to 0.05:0.1:1 to obtain the catalyst labeled B.

Example Embodiment

[0059] Example 3

[0060] A vanadium-tungsten-titanium oxide catalyst comprising the following components according to mass percentage: 17% vanadium pentoxide, 11% tungsten trioxide and 73% titanium dioxide; the vanadium pentoxide, tungsten trioxide and titanium dioxide are uniformly mixed And the crystal grain sizes of vanadium pentoxide, tungsten trioxide and titanium dioxide are independently 1-15nm.

[0061] The preparation method of the vanadium tungsten titanium oxide catalyst is:

[0062] Other conditions remain unchanged as in Example 1, and the molar ratio of V:W:Ti is changed to 0.1:0.05:1 to obtain the catalyst, labeled C.

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Abstract

The invention provides a V-W-Ti oxide catalyst, a preparation method and an application thereof. The V-W-Ti oxide catalyst comprises, by mass, 5-25% of V2O5, 5-30% of WO3 and 50-80% of TiO2. The V2O5, the WO3 and the TiO2 are uniformly mixed, grain size of each oxide crystal being 1-30 nm independently. The V-W-Ti oxide catalyst is used for selectively catalytic reducing NOx with good catalytic performance and has excellent catalytic performance even under a high space velocity. The catalyst has a wide operation temperature window and has excellent low-temperature activity, nitrogen generation selectivity, water resistance, sulfur resistance and thermal stability within the temperature range of 150-500 DEG C. The preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a vanadium-tungsten-titanium oxide catalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) can cause major environmental problems such as haze, acid rain and photochemical smog, and control NO x Emissions are a major challenge in the field of environmental protection. Since the 1970s, NH 3 Selective Catalytic Reduction of NO x (i.e. NH 3 -SCR) technology is widely used in coal-fired power plants, industrial boilers and other fixed source flue gas denitrification. Traditional V 2 o 5 -WO 3 / TiO 2 As a commercial SCR catalyst, the catalyst has been used in the field of stationary source denitrification for many years, and because of its unique anti-SO 2 The ability to poison is still irreplaceable. In addition, V 2 o 5 -WO 3 / TiO 2 The catalyst is also accompanied by NH 3 -SCR technology is introduced to diese...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/56B01D53/86
CPCB01J23/30B01D53/8628B01D2258/0283B01J23/002B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 贺泓单文坡连志华邓华
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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