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Copper and iron modified titanium dioxide pillared bentonite catalyst and preparation method thereof

A titanium dioxide and catalyst technology, applied in the field of catalysts, can solve the problems of catalyst deactivation, blocking downstream pipelines, and short catalyst life.

Inactive Publication Date: 2009-10-14
无锡科立泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although SCR technology has been industrialized and has some advantages, it still has some disadvantages, such as short catalyst life, low activity of traditional vanadium-based catalysts, high sulfur dioxide oxidation activity, and a lot of sulfate formation. Causes catalyst deactivation and clogs downstream piping

Method used

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  • Copper and iron modified titanium dioxide pillared bentonite catalyst and preparation method thereof
  • Copper and iron modified titanium dioxide pillared bentonite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Cu-TiO 2 -PILC

[0035] 1.1 TiO 2 - Preparation of PILC

[0036] Method (1): Anhydrous TiCl 4 Form Ti cross-linking agent solution with alcohol (propanol, isopropanol, methanol, ethanol, butanol, isobutanol or their mixture) solvent, and with 0.1-10wt% bentonite alcohol suspension with titano-soil ratio 2-20mmol / g mixed, hydrothermal reaction at 50-220°C for 1-72 hours. Then filter, wash and dry at 120°C, and finally bake at 350-500°C for 1-24 hours.

[0037] Method (2): First prepare TiCl 4 Disperse in hydrochloric acid aqueous solution to form Ti crosslinking agent solution, the concentration of hydrochloric acid is between 0.1-1.0M. Mix the Ti crosslinking agent solution with 0.1-10wt% bentonite aqueous suspension at a titanium-to-soil ratio (2mmol-50mmol) / g, age for 1-72 hours, then filter, wash and dry at 120°C, and finally dry at 350- Baking at 500°C for 1-24 hours.

[0038] 1.2 Cu-TiO 2 - Preparation of PILC

[0039] Using the traditional aqu...

Embodiment 2

[0040] Example 2 Fe-TiO 2 -PILC

[0041] 2.1 TiO 2 The preparation of -PILC is the same as 1.1.

[0042] 2.2 Fe-TiO 2 - Preparation of PILC

[0043] Applying the traditional aqueous ion exchange method, TiO 2 - PILC was added to an aqueous iron salt solution (solid / liquid = 1 g: 10-2000 ml), and kept stirring for 1-72 hours. Sources of iron salt precursors include ferric sulfate, ferrous sulfate, ferric nitrate, ferric chloride, ferrous chloride, and ferric acetate. The concentration of the iron salt solution is between 0.01-5.0M. Then filter, wash, dry at 120°C, and finally bake at 350-500°C for 1-24 hours.

Embodiment 3

[0044] Example 3 Cu-Fe-TiO 2 -PILC

[0045] 3.1 TiO 2 The preparation of -PILC is the same as 1.1.

[0046] 3.2 Cu-Fe-TiO 2 - Preparation of PILC

[0047] Using the traditional aqueous solution ion exchange method, the TiO 2 - PILC was added to copper and iron salt aqueous solution (Cu / Fe molar ratio = 0.01-100:1, solid / liquid = 1 g / 10-2000 ml), and kept stirring for 1-72 hours. The concentration of the total copper and iron salt solution is between 0.01-5.0M. Then filter, wash, dry at 120°C, and finally bake at 350-500°C for 1-24 hours.

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Abstract

The invention relates to a 'copper and iron modified titanium dioxide pillared bentonite catalyst and a preparation method thereof', and belongs to the catalyst field of ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas. The catalyst consists of X / Cu-Fe-TiO2-PILC, wherein, percentage content of X is 0-10% by weight, the percentage content of Cu is 0.05-30% by weight, the percentage content of Fe is 0.05-30% by weight, the content of Ti is 5-50% by weight, and precursors of Cu and Fe are Cu salts and Fe salts; wherein, X represents a rare earth metal oxides. Compared with conventional vanadium-based catalysts, the catalyst has higher reduction activity on nitrogen oxides. Cu-TiO2-PILC has higher low-temperature catalytic activity, Cu-Fe-TiO2-PILC has a wider activation temperature range, and the rare earth metal oxide is added, which can further improve the catalytic activity.

Description

technical field [0001] The invention relates to a catalyst for selectively catalytically reducing nitrogen oxides into nitrogen by ammonia, in particular to a copper and iron modified titanium dioxide pillared bentonite catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) mainly include N 2 O, NO, N 2 o 3 , NO 2 , N 2 o 4 , N 2 o 5 Compounds such as NOx are the main air pollutants. The total amount of NOx emitted into the atmosphere around the world reaches 50 million tons every year, and it is still growing. Therefore, research on NOx control is one of the main contents in the field of global environmental protection. [0003] There are two ways to produce NOx: one is natural production, and the other is artificial production. Natural sources include lightning, ammonia oxidation in the atmosphere, and nitrification of microorganisms in the soil. The NOx formed in nature has reached an ecological balance due to natural selec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/745B01J23/72B01D53/94B01D53/56
Inventor 齐共新
Owner 无锡科立泰科技有限公司
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