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Layered structure cerium based oxide catalyst, preparation method and application thereof

A technology of cerium-based oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, separation methods, etc., can solve poor activity, poor water and sulfur resistance, and operating temperature window Narrow and other issues, to achieve the effect of excellent N2 generation selectivity, good water resistance and thermal stability, and wide operating temperature window

Inactive Publication Date: 2016-06-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Non-vanadium-based transition metal (such as Fe, Cu, Mn, and Ce) oxide catalysts are considered as potential substitutes for vanadium-based catalysts, but such catalysts are used in NO x There are still many problems in the actual application process with the goal of removal: although Mn-based oxide catalysts have excellent low-temperature SCR activity, they have poor water and sulfur resistance; Cu-based catalysts have a narrow operating temperature window and N 2 Poor selectivity and other issues; Fe-based oxide catalysts have poor activity at low temperature and high space velocity
Due to pure CeO 2 The reduction temperature is high and it is easy to sinter at high temperature, so it is not suitable to be used alone as NH 3 -SCR catalyst

Method used

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  • Layered structure cerium based oxide catalyst, preparation method and application thereof
  • Layered structure cerium based oxide catalyst, preparation method and application thereof
  • Layered structure cerium based oxide catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the Ce:Mo molar ratio of 2:1, prepare a mixed solution of cerium nitrate and ammonium molybdate, then add urea, control the pH value of the mixed solution after all the dissolution is 3.1, then heat to 80-90°C and continuously stir for 12h, the pH Raise to 7.2, then filter and wash, put the obtained solid in an oven and dry at 100-110°C for 12 hours, and finally roast in the air at 500°C for 5 hours in a muffle furnace to obtain a powder catalyst, which is called catalyst A .

Embodiment 2

[0037] According to the molar ratio of cerium, molybdenum and titanium is 2:1:10, dissolve titanium sulfate in deionized water, then add cerium nitrate and ammonium molybdate, and add urea as a precipitant to control the pH value of the mixed solution after all dissolution It is 1.2, then heated to 80-90°C and continuously stirred for 12 hours, the pH rises to 7.3, then filtered and washed, the resulting solids are put into an oven and dried at 100-110°C for 12 hours, and finally passed through a muffle furnace in Calcined in air at 500°C for 5h to obtain a powder catalyst, called catalyst B.

Embodiment 3

[0039] Other conditions were unchanged as in Example 2, and the molar ratio of cerium, molybdenum, and titanium was changed to 2:1:2 to obtain catalyst C.

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Abstract

The invention discloses a cerium based oxide catalyst for catalytic purification of nitrogen oxides and a preparation method thereof. The catalyst is a layered structure CeOx / MoO3-TiO2 catalyst formed by step-by-step uniform precipitation based on controllable adjustment of a pH value in the preparation process. According to the invention, non-toxic and harmless raw materials are employed to prepare the cerium based oxide catalyst with the characteristics of excellent catalytic activity, high N2 generation selectivity, wide operation temperature window and the like through a simple and practicable method. The catalyst is suitable for nitrogen oxide catalytic purification devices adopting a diesel vehicle exhaust represented mobile source and a coal-fired power plant flue gas represented stationary source.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and application thereof, in particular to a cerium-based oxide catalyst 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 one of the main air pollutants, which can cause major environmental problems such as haze, photochemical smog and acid rain, and also cause direct harm to human health. Therefore, effective control of NO x Emissions are a major challenge in the field of environmental protection. [0003] With the increasingly stringent environmental regulations and standards, NH 3 Selective Catalytic Reduction of NO x (i.e. NH 3 -SCR) technology is considered to be the most promising NO x Purification technology. The catalyst is the core of the SCR reaction system, and the performance of the catalyst (including activity, selectivity, and stability) dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/90B01D53/56
CPCB01J23/002B01D53/8628B01D53/90B01D2255/2065B01D2255/20707B01D2255/20769B01D2257/404B01J23/28B01J2523/00B01J2523/3712B01J2523/47B01J2523/68
Inventor 耿阳单文坡陈晓玲丁鸿羽王大鹏明路沙李骋杨士建
Owner NANJING UNIV OF SCI & TECH
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