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BaFeO3-x/Cu-ZSM-5 coupled catalyst and application thereof

A bafeo3-x, cu-zsm-5 technology, applied in the BaFeO3-x and Cu-ZSM-5 coupling catalyst, the field of nitrogen oxide elimination, can solve the problems of high price, excess O2, poor sulfur resistance, etc. To achieve the effect of high elimination efficiency, abundant sources and low cost

Inactive Publication Date: 2013-04-03
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, when the lean-burn engine is running, due to the air-fuel ratio far away from the theoretical air-fuel ratio, resulting in O 2 A large excess, making nitrogen oxides (NO x , including NO and NO 2 ) has become the main problem restricting the application of lean burn engines
The lean-burn nitrogen oxide trap (LNT) technology first proposed by Japan's Toyota Motor Corporation has been practically applied in lean-burn engine vehicles with low-sulfur content fuels. This technology commonly uses Pt / BaO / Al containing noble metal Pt 2 o 3 Catalyst, although its activity is good, but the price is expensive, the active components are easy to lose, and the anti-sulfur performance is not good

Method used

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  • BaFeO3-x/Cu-ZSM-5 coupled catalyst and application thereof
  • BaFeO3-x/Cu-ZSM-5 coupled catalyst and application thereof
  • BaFeO3-x/Cu-ZSM-5 coupled catalyst and application thereof

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Embodiment 1

[0013] BaFeO 3-x Preparation: Using EDTA-CA as a complexing agent, according to EDTA (ethylenediaminetetraacetic acid): CA (citric acid): Metals=1:1.5:1, BaFeO was prepared by sol-gel method 3-x perovskite catalyst. Calculated according to the sample mass and the stoichiometric ratio of each metal element, it is necessary to weigh 5.410g Ba(NO 3 ) 2 , 8.363g Fe(NO 3 ) 3 9H 2 O, 13.050g of citric acid and 12.099g of ethylenediaminetetraacetic acid reagent were weighed and placed in 300mL of deionized water for 30min ultrasonic treatment. Then the pH of the solution was adjusted to 6 with ammonia water, heated and stirred in a water bath at 80oC until a sol was formed. The prepared gel was dried at 120oC, and the dried precursor was baked at 750oC for 6h. The calcined samples were tabletted and sieved to obtain catalyst particles with a size of 40-60 mesh. Denote this catalyst as BaFeO 3-x catalyst.

[0014] Preparation of Cu-ZSM-5: prepare 400mL of Cu(NO 3 ) 2 The s...

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Abstract

The invention discloses a BaFeO3-x / Cu-ZSM-5 coupled catalyst and application thereof. The coupled catalyst is formed by mixing BaFeO3-x and Cu-ZSM-5 in a mass ratio of 2:1 in a stratified mode in a reactor, wherein the BaFeO3-x is on the upper layer, and the Cu-ZSM-5 is on the lower layer. The process of eliminating oxynitrides in automobile exhaust by using the coupled catalyst comprises the following steps: at the temperature of 200-400 DEG C, introducing a gas mixture containing NO, O2 and N2 into a reactor at the air speed of 15000h<-1> to carry out NOx oxidation storage; introducing a gas mixture containing NO and C3H6 into the reactor at the same temperature and air speed to carry out NOx reduction; and repeating the NOx oxidation storage-reduction process. The coupled catalyst has the advantages of abundant sources and low cost; and by using the C3H6 as the reducer, the efficiency of eliminating oxynitrides in the automobile exhaust is high, and the N2 selectivity is approximate to 100%.

Description

technical field [0001] The present invention relates to a kind of BaFeO 3-x The catalyst coupled with Cu-ZSM-5 and its application belong to the nitrogen oxide elimination technology in the field of automobile exhaust purification. Background technique [0002] The environmental problems caused by nitrogen oxides in automobile exhaust pollutants are becoming more and more serious, and at the same time, it is extremely harmful to people's health. The effective elimination of nitrogen oxides is imminent. Lean-burn engines can improve combustion efficiency and output power, and can also effectively reduce greenhouse gas CO 2 emissions, has become the mainstream direction of automotive engine development. However, when the lean-burn engine is running, because the air-fuel ratio deviates far from the theoretical air-fuel ratio, O 2 A large excess, making nitrogen oxides (NO x , including NO and NO 2 ) has become a major problem restricting the application of lean burn engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01D53/94B01D53/56
Inventor 李新刚李锋丽吕姣龙贤晖
Owner TIANJIN UNIV
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