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Preparation method of vanadium-based oxide catalyst

A technology for oxides and catalysts is applied in the field of preparation of vanadium-based oxide catalysts, which can solve the problems of poor fuel quality and high sulfur content, and achieve the effects of simple preparation method, low cost and excellent low-temperature activity.

Inactive Publication Date: 2018-07-03
NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because the fuel quality of diesel vehicles in my country is generally poor, the sulfur content is relatively high

Method used

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  • Preparation method of vanadium-based oxide catalyst
  • Preparation method of vanadium-based oxide catalyst
  • Preparation method of vanadium-based oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Cerium nitrate was used as Ce source, ammonium tungstate was used as W source, titanium sulfate was used as Ti source, ammonium metavanadate was used as V source, oxalic acid was used as co-solvent, and urea was used as slow-release precipitant.

[0043] According to Ce:W:Ti molar ratio is 0.2:0.1:1, cerium nitrate and ammonium tungstate are dissolved in titanium sulfate solution, stir continuously until all dissolve completely, then add excessive precipitating agent urea in this solution, and in 90 Continue to stir for 12 hours under the condition of ℃, then carry out suction filtration and washing, then put the obtained solid in an oven and dry at 110℃ for 12 hours, and then roast in the air at 500℃ for 5 hours in a muffle furnace to obtain powdered cerium tungsten titanium oxide material carrier.

[0044] Dissolve ammonium metavanadate in oxalic acid solution, then follow V 2 o 5 The loading amount is 1wt%, adding cerium tungsten titanium oxide carrier, rotary evap...

Embodiment 2

[0046] Other conditions are as embodiment 1 constant, change Ce:W:Ti mol ratio, make 2% V 2 o 5 / C 0.5 W 0.1 TiO x catalyst.

Embodiment 3

[0048] Other conditions are as embodiment 1 constant, change Ce:W:Ti mol ratio, make 1.5% V 2 o 5 / C 1 W 0.1 TiO x catalyst.

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Abstract

The invention relates to a catalyst, and in particular relates to a preparation method of a vanadium-based oxide catalyst, belonging to the technical field of catalysts. The method comprises the following steps: firstly, preparing a carrier CeaWbTiOx by a method of precipitation; and then loading V2O5 to the surface of the carrier by an impregnation method. The method specifically comprises the following steps: preparing a mixed solution of a cerium source, a tungsten source and a titanium source; adding a slow release settling agent into the solution; then separating the precipitate; drying and roasting the precipitate to obtain a cerium tungsten and titanium oxide carrier; then adding the cerium tungsten and titanium oxide carrier into a vanadium source solution to be stirred; and vaporizing, drying and roasting the solution to obtain the vanadium-based oxide catalyst taking the cerium tungsten and titanium oxide as the carrier. The vanadium-based oxide catalyst prepared by the invention has very excellent low-temperature activity, a very wide temperature window, excellent N2 generation selectivity and an excellent anti-SO2 poisoning ability.

Description

technical field [0001] The invention relates to a catalyst, in particular to a preparation method of a vanadium-based oxide catalyst, and belongs to the technical field of catalysts. Background technique [0002] Nitrogen oxides (NO x ) can cause important air pollution 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 and diesel vehicle exhaust nitrogen oxide purification. The technology is under the action of catalyst, using reducing agent NH 3 NO in flue gas x Selective reduction to N 2 and H 2 O. [0003] Traditional V 2 o 5 -WO 3 -TiO 2 As a commercial SCR catalyst, the catalyst has been used for many years in the field of stationary source denitrification such as c...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J37/02B01D53/86B01D53/94B01D53/56
CPCB01D53/8628B01D53/9413B01D2251/2062B01D2258/01B01D2258/0283B01J23/002B01J23/30B01J37/0201B01J2523/00B01J2523/3712B01J2523/47B01J2523/55B01J2523/69
Inventor 贺泓单文坡连志华邓华张燕李要彬
Owner NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI