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Rare-earth perovskite type catalyst for purifying automobile tail gas and preparation method

A perovskite-type, automobile exhaust technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of unsuitable purification of automobile exhaust and low activity, and achieve low cost, simple operation, and high activity. Effect

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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  • Rare-earth perovskite type catalyst for purifying automobile tail gas and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 6.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 3.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.6g manganese nitrate (Mn(NO 3 ) 2 4H 2 O), 2.5g citric acid (C 6 h 8 o 7 ·H 2 (0), it was dissolved in 70ml deionized water, stirred and dissolved at a temperature of 45° C. for 1 hour; the mixed solution was heated at a temperature of 120° C., and evaporated to dryness to obtain a catalyst precursor; The pre-calcined catalyst precursor was pre-calcined in a muffle furnace at a temperature program rate of ℃ / min, and the temperature was raised to 400 °C, kept at a constant temperature for 3.5 hours, and weighed to obtain 6.9 g of the precursor after cooling; the pre-calcined catalyst precursor was mixed with Add 0.2g of ground activated carbon powder, and press it into tablets with a pressure of 11 MPa; under the protection of nitrogen, calcinate the pressed catalyst at a programmed temperature increase rate of 11 °C / min, and the temperature rises to 1050 °C , constant...

Embodiment 2

[0024] Weigh 6.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 3.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.6g manganese nitrate (Mn(NO 3 ) 2 4H 2 O), 2.3g 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 1.5 hours; the mixed solution was heated at a temperature of 110°C, and evaporated to dryness to obtain a catalyst precursor; The catalyst precursor was pre-calcined at a temperature programming rate of / min, and the temperature was raised to 400°C, kept at a constant temperature for 3 hours, and weighed to obtain 6.2g of the catalyst precursor after cooling; The final activated carbon carbon powder is compressed into tablets with a pressure of 10MPa; under the protection of nitrogen, the catalyst after the compression is calcined at a programmed temperature increase rate of 10°C / min, and the temperature rises to 1050°C, and the temperature is kept at a constant temperature for 4 hours. The cata...

Embodiment 3

[0027] Catalyst LaSrMnO 4 Preparation of:

[0028] Weigh 6.1g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 3.1g strontium nitrate (Sr(NO 3 ) 2 ), 3.6g manganese nitrate (Mn(NO 3 ) 2 4H 2 O), 2.5g citric acid (C 6 h 8 o 7 ·H 2 O), it was dissolved in 85ml deionized water, stirred and dissolved at a temperature of 55° C. for 1 hour; the mixed solution was heated at a temperature of 160° C., and evaporated to dryness to obtain a catalyst precursor; Pre-calcining the catalyst precursor at a temperature programming rate of / min, the temperature rose to 420°C, and weighed to obtain 7.1g of the precursor after cooling; 0.3g Printex-U carbon black was added to the pre-calcined catalyst precursor, It was pressed into tablets at a pressure of 10 MPa; under the protection of nitrogen, the compressed catalyst was calcined at a temperature program rate of 10 °C / min, the temperature was raised to 1000 °C, kept at a constant temperature for 4 hours, and the catalyst was obtained afte...

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Abstract

The invention discloses a rare-earth perovskite type catalyst for purifying an automobile tail gas and a preparation method. A structural formula of the rare-earth perovskite type catalyst for purifying the automobile tail gas is LaSrMnO4. The preparation process of the rare-earth perovskite type catalyst comprises the following steps of: preparing a solution with the concentration of 0.15-1.5 mol / L by taking lanthanum nitrate, strontium nitrate, manganese nitrate and citric acid as raw materials; evaporating the moisture of the solution to dryness; previously calcining a precursor at the temperature of 380-420 DEG C, doping carbon powder, and finally calcining at the temperature of 900-1200 DEG C to prepare the LaSrMnO4 for purifying the automobile tail gas. The invention has the advantages that the preparation method of the rare-earth perovskite type catalyst is a sol-gel method and has the advantages of easiness for operation and low cost; and the prepared rare-earth perovskite type catalyst has high activity and achieves the transformation rate of more than 77 percent for purifying the automobile tail gas NO.

Description

technical field [0001] The invention relates to a rare-earth perovskite catalyst for purifying automobile tail gas and a preparation method thereof, belonging to the catalyst technology. Background technique [0002] In recent years, with the continuous improvement of people's living standards, the number of private cars has soared, and the problem of automobile exhaust pollutants has become increasingly serious. According to statistics, the number of cars in my country has exceeded 70 million, and the number of cars in the world may reach one billion. During the "Twelfth Five-Year Plan" period, my country's motor vehicle nitrogen oxide emissions accounted for 30% of the total emissions. Studies have shown that nitrogen oxides in the atmosphere will undergo a series of reactions in the sun to generate photochemical smog, which endangers people's health. At the same time It will cause acid rain, deteriorate water quality, endanger agricultural production, cause corrosion to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/94B01D53/56
Inventor 马智朱云峰丁彤李志军齐晓周
Owner TIANJIN UNIV
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