Mixed rare-earth denitration catalyst and preparation method thereof

A denitrification catalyst and mixed rare earth technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy sintering, unsatisfactory thermal stability of rare earth oxides, and decreased catalytic activity, etc. low cost, wide reaction temperature window, and high catalytic efficiency

Inactive Publication Date: 2017-12-01
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although rare earth oxides show certain catalytic activity for certain chemical reactions, and their catalytic activity can be improved by reducing their particle size, increasing their specific surface area, or modifying their surface crystal plane composi

Method used

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preparation example Construction

[0014] The invention provides a method for preparing a mixed rare earth denitrification catalyst, which can be applied to the field of NH3-selective catalytic reduction denitrification of coal-fired flue gas, and has the advantages of high catalytic efficiency and good economic efficiency. Low consumption, good catalytic effect.

[0015] The invention provides a mixed rare earth denitration catalyst, the active component of the denitration catalyst is a double active component composed of a mixed rare earth oxide and a transition metal oxide. Due to the synergistic effect between mixed rare earth oxides and between rare earth oxides and transition metal oxides, the catalyst has the advantages of high catalytic efficiency and wide reaction temperature window.

[0016] Further, the carrier of the mixed rare earth denitration catalyst is γ-A1 2 o 3 Or activated charcoal. The carrier has the advantages of large specific surface area and developed pore structure, and is suitable...

Embodiment 1

[0025] Accurately weigh 0.6g of Ce(NO 3 ) 3 ·6H 2 O crystals, 0.16g of La(NO 3 ) 3 ·6H 2 O crystals, 0.06g of Fe(NO 3 ) 3 9H 2 O crystals, dissolved in 40ml of purified water, stirring continuously until completely dissolved. Accurately weigh 4g of γ-A1 2 o 3 Particles were added to the mixed rare earth aqueous solution prepared above, allowed to stand at room temperature for 1 day, dried at 150°C for 3 hours, and the dried samples were calcined at 500°C for 3 hours under an argon atmosphere to obtain a mixed rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 300-400°C and is mainly used in SCR flue gas denitrification in coal-fired power plants.

Embodiment 2

[0027] Accurately weigh 0.6g of Ce(NO 3 ) 3 ·6H 2 O crystals, 0.16g of La(NO 3 ) 3 ·6H 2 O crystals, 0.06g of Mn(NO3) 2 4H 2 O crystals, dissolved in 40ml of purified water, stirring continuously until completely dissolved. Accurately weigh 4g of γ-A1 2 o 3 Particles were added to the mixed rare earth aqueous solution prepared above, allowed to stand at room temperature for 1 day, dried at 150°C for 3 hours, and the dried samples were calcined at 500°C for 3 hours under an argon atmosphere to obtain a mixed rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 200-300°C, and is mainly used in low-temperature SCR flue gas denitrification of industrial sources.

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Abstract

The invention relates to a mixed rare-earth denitration catalyst and a preparation method thereof. An active component of the denitration catalyst is a double-active component composed of mixed rare-earth oxide and transition element oxide. The catalyst has the advantages of high catalytic efficiency, wide reaction temperature window and the like due to the synergistic effect between the mixed rare-earth oxide and between the rare-earth oxide and the transition element oxide. A preparation technology adopts an immersion method to manufacture and has the advantage of simple technology, wide raw material sources, low cost and the like. The mixed rare-earth oxide catalyst provided by the invention is mainly applied to the aspect of purifying industrial waste gas, and is especially used for the aspect of flue gas denitration. The mixed rare-earth denitration catalyst can be used for middle-temperature and low-temperature flue gas denitration of coal-fired power plants and can also be used for the field of low-temperature flue gas denitration of an industrial source.

Description

technical field [0001] The invention relates to the field of waste gas treatment and purification, in particular to a mixed rare earth denitrification catalyst and a preparation method thereof. Background technique [0002] Rare earth elements exhibit unique chemical properties due to their unfilled 4f orbitals and lanthanide contractions. As catalysts, they have been widely used in many important chemical processes, such as petrochemicals, catalytic combustion of fossil fuels, carbon 1. Chemical industry, environmental catalysis, purification of motor vehicle exhaust and purification of toxic and harmful gases, etc. Since the mid-1960s, extensive research has been conducted on the properties of rare earth compounds at home and abroad, including the study of rare earth alternatives to precious metals that are relatively scarce; the use of rare earths to improve or prepare new catalytic materials with better performance and more environmental protection; To study the mechani...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/34B01J37/08B01D53/86B01D53/56
Inventor 龚志军武文斐李保卫张凯金光
Owner INNER MONGOLIA UNIV OF SCI & TECH
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