Perovskite-like catalyst used for purifying automobile tail gas, and preparation method thereof

A technology for automobile exhaust gas and catalyst, which is applied in chemical instruments and methods, separation methods, dispersed particle separation and other directions, can solve the problems of unsuitable purification of automobile exhaust gas and low activity, and achieves the effects of low cost, simple operation and high activity

Inactive Publication Date: 2011-11-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst avoids the use of precious metals, but is relatively inactive and not suitable for purifying automobile exhaust

Method used

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  • Perovskite-like catalyst used for purifying automobile tail gas, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 9.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 1.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.8g nickel nitrate (Ni(NO 3 ) 3 ·6H 2 O), 2.5g citric acid (C 6 h 8 o 7 ·H 2 (0), it was dissolved in 100ml deionized water, stirred and dissolved at a temperature of 50° C. for half an hour; the mixed solution was heated at a temperature of 110° C., and the water was evaporated to obtain a catalyst precursor; Pre-calcining the catalyst precursor in a muffle furnace at a heating rate of ℃ / min, the temperature was raised to 400°C, kept at a constant temperature for 3 hours, and weighed to obtain 6.5g of the catalyst precursor after cooling; the pre-calcined catalyst precursor was mixed with Add 0.2 g of ground activated carbon powder, and press it into tablets with a pressure of 9 MPa; under the protection of nitrogen, calcinate the catalyst precursor after the tablet molding at a heating rate of 10 °C / min, and the temperature rises to 1100 ℃, constant temperature for 3...

Embodiment 2

[0022] Weigh 9.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 1.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.8g nickel nitrate (Ni(NO 3 ) 3 ·6H 2 O), 2.9g citric acid (C 6 h 8 o 7 ·H 2 O), it was dissolved in 90ml deionized water, stirred and dissolved at a temperature of 50°C for half an hour; the mixed solution was heated at a temperature of 100°C, and the water was evaporated to obtain a catalyst precursor; The catalyst precursor was pre-calcined at a heating rate of / min, and the temperature was raised to 450°C, kept at a constant temperature for 2.5 hours, and weighed after cooling to obtain 6.2g of the catalyst precursor; 0.3g of Printex-U was added to the pre-calcined catalyst precursor Type carbon black, with a pressure of 10MPa, it is tableted; under the protection of nitrogen, the catalyst precursor after tableting is calcined at a heating rate of 10°C / min, and the temperature rises to 900°C, and the temperature is maintained for 4 hours. The catalyst was obtained ...

Embodiment 3

[0025] Weigh 9.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 1.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.8g nickel nitrate (Ni(NO 3 ) 3 ·6H 2 O), 2g citric acid (C 6 h 8 o 7 ·H 2 O), it was dissolved in 100ml deionized water, stirred and dissolved at a temperature of 50°C for half an hour; the mixed solution was heated at a temperature of 100°C, and the water was evaporated to dryness to obtain a catalyst precursor; The catalyst precursor was pre-calcined at a heating rate of ℃ / min. The temperature was raised to 410°C, kept at a constant temperature for 3.5 hours, and weighed to obtain 7.3g of the catalyst precursor after cooling; The final activated carbon powder was pressed into tablets with a pressure of 10MPa; under the protection of nitrogen, the catalyst precursor was calcined at a heating rate of 9°C / min, and the temperature was raised to 1200°C and kept at a constant temperature for 4 hours. , and the catalyst was obtained after cooling.

[0026] Activity evalua...

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Abstract

The invention discloses a perovskite-like catalyst used for purifying automobile tail gas, and a preparation method thereof. The perovskite-like catalyst used for purifying automobile tail gas is represented by a structural formula of La1-6Sr0-4NiO4. The preparation method comprises steps that: nitrates of lanthanum, strontium and nickel, and citric acid are adopted as raw materials; a solution with a concentration of 0.15 to 1.5mol / L is prepared; moisture in the solution is removed through steaming; a precursor is precalcined at a temperature of 380 to 420 DEG C; powdered carbon is added, and the materials are calcined at a temperature of 900 to 1200 DEG C, such that La1-6Sr0-4NiO4 used for purifying automobile tail gas is obtained. The invention is advantaged in that: the preparation method is a sol-gel method; the operation is simple; the cost is low; the obtained catalyst has a high activity; and an NO conversion rate is more than 60% under a temperature of 300 DEG C.

Description

technical field [0001] The invention relates to a perovskite-like catalyst for purifying automobile exhaust gas and a preparation method thereof, belonging to catalyst technology. Background technique [0002] Automobile exhaust is one of the main causes of air pollution, and a large amount of exhaust gas makes the living environment of human beings deteriorate sharply. In order to protect the environment, many countries are actively formulating and enforcing exhaust emission regulations to reduce harmful emissions in diesel engine exhaust, especially the emission level of nitrogen oxides (NOx), which has become an important technical research hotspot in the world. At the end of the 1980s, Japanese scientist Yoshida first proposed the simultaneous removal of NOx and PM by catalytic reduction. Because of the one-step process and the reducing agent comes from exhaust emissions, it has attracted widespread attention. At present, the catalysts in this direction are mainly Pt-Ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/94B01D53/56
Inventor 马智朱云峰丁彤齐晓周李志军
Owner TIANJIN UNIV
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