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Tungsten titanium composite oxide supported cerium oxide catalyst, preparation method as well as application of catalyst

A technology of composite oxides and mixed oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve poor high temperature stability, narrow operating temperature window, Biological toxicity and other problems, to achieve good water and sulfur resistance and thermal stability, wide operating temperature window, excellent catalytic performance

Inactive Publication Date: 2014-06-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the V2O5-WO3 / TiO2 catalyst was obtained as the first generation SCR catalyst for diesel vehicles However, there are still many problems in the application of vanadium-based oxide catalysts in the catalytic purification of diesel vehicle exhaust, such as biological toxicity, poor high temperature stability, and narrow operating temperature window.

Method used

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  • Tungsten titanium composite oxide supported cerium oxide catalyst, preparation method as well as application of catalyst
  • Tungsten titanium composite oxide supported cerium oxide catalyst, preparation method as well as application of catalyst
  • Tungsten titanium composite oxide supported cerium oxide catalyst, preparation method as well as application of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the molar ratio of cerium, tungsten, titanium and urea is 0.2 : 0.1 : 1.0 : 13, titanium sulfate is dissolved in deionized water to make the pH value of the solution as low as about 0, and then ammonium tungstate, cerium nitrate and urea are added to control After all dissolved, the pH of the mixed solution is 0.05, and then heated to 80~90 o C and continuously stirred for 1 h, the pH increased to 0.5, then filtered and washed, and the resulting solids were put into an oven at 100~110 o C drying for 12 h, and finally through the muffle furnace at 500 o C was calcined in air for 5 h to obtain a powdered catalyst, called catalyst A.

Embodiment 2

[0040] Other conditions were the same as in Example 1, but the continuous stirring time was changed to 2 h, and the pH was increased to 1.4 to obtain catalyst B.

Embodiment 3

[0042] Other conditions were the same as in Example 1, but the continuous stirring time was changed to 3 h, and the pH was increased to 2.8 to obtain catalyst C.

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Abstract

The invention discloses a cerium based oxide catalyst for ammonia selective catalytic reduction nitric oxide, a preparation method as well as application of the catalyst. The catalyst is prepared by the following steps: carrying out controllable regulation on the pH value in the preparation process; forming a metal oxide catalyst CeO(i)x( / i) / WO(i)y( / i)-TiO2 and cerium oxide CeO(i)x( / i) by fractional precipitation, and uniformly dispersing on the surface of a tungsten titanium composite oxide WO(i)y( / i)-TiO2. The cerium based oxide catalyst which has the characteristics of excellent low-temperature catalytic activity, high N2 generation selectivity, wide operation temperature window, capability of being adaptive to high-airspeed reaction conditions and the like is prepared from nontoxic and harmless raw materials by a simple and feasible method, and is suitable for nitric oxide catalytic purification devices with mobile sources represented by tail gas of a diesel vehicle and fixed sources represented by flue of coal burned power plants.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and application thereof, in particular to a cerium oxide catalyst supported by a tungsten-titanium composite oxide for catalytic purification of nitrogen oxides, a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) is an important pollutant in the atmosphere. Our country currently consists of NO x Major environmental problems such as smog, photochemical smog and acid rain caused by the x The emission of pollutants is an important issue that needs to be solved urgently in the field of environmental protection. [0003] NH 3 Selective Catalytic Reduction of NO x (i.e. NH 3 -SCR) technology has been widely used in coal-fired power plants and other stationary sources of NO x Catalytic elimination and mobile source NO such as diesel vehicle exhaust x Catalytic purification. Will NH 3 -SCR technology applied to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/94B01D53/56
Inventor 单文坡黄海丽杨士建张晋华肖鑫黄宇廖勇熊尚超
Owner NANJING UNIV OF SCI & TECH
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