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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst prepared by this method is resistant to high temperature, its performance needs to be further improved

Method used

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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

Experimental program
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Effect test

Embodiment 1

[0051] A vanadium tungsten titanium oxide catalyst, comprising the following components by 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 1-15 nm.

[0052] The preparation method of described vanadium tungsten titanium oxide catalyst comprises the steps:

[0053] Ammonium metavanadate is used as vanadium source, ammonium tungstate is used as tungsten source, titanium sulfate is used as titanium source, oxalic acid is used as co-solvent, and urea is used as slow-release precipitant.

[0054] Add ammonium metavanadate, ammonium tungstate and sulfuric acid to the solvent containing co-solvent (the mass of oxalic acid is the sum of the mass of ammonium metavanadate and ammonium tungstate) according to V:W:Ti molar ratio of 0.05:0.05:1 Titanium, made ...

Embodiment 2

[0056] A vanadium tungsten titanium oxide catalyst, comprising the following components by 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 1-15 nm.

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

[0058] Other conditions are the same as in Example 1, but the molar ratio of V:W:Ti is changed to 0.05:0.1:1, and the catalyst is marked as B.

Embodiment 3

[0060] A vanadium tungsten titanium oxide catalyst, comprising the following components by mass percentage: 17% of vanadium pentoxide, 11% of tungsten trioxide and 73% of 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 1-15 nm.

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

[0062] Other conditions were the same as in Example 1, and the molar ratio of V:W:Ti was changed to 0.1:0.05:1 to obtain the catalyst, marked as 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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