Compound metal oxide and nitride catalyst for low-temperature selective catalytic reduction of ammonia

A composite metal and oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problem of short catalyst life, low catalyst activity at low temperature, blocking downstream pipelines, etc. Problems, to achieve the effect of easy industrialization of SCR technology, increase conversion rate, and increase reactivity

Inactive Publication Date: 2009-10-07
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

[0010] 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
Therefore, it is necessary to put the catalyst after the desulfurization and dust removal equipment, so that the life of the catalyst will be greatly improved; however

Method used

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  • Compound metal oxide and nitride catalyst for low-temperature selective catalytic reduction of ammonia
  • Compound metal oxide and nitride catalyst for low-temperature selective catalytic reduction of ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] 1. Preparation of A-B-C Composite Metal Oxide

[0031] Under stirring conditions, different proportions of metal nitrates (dissolved in deionized water, the solution uses NaOH as a precipitant, aged for 4-6 hours, washed with deionized water, filtered, and finally in the air at 400-1000 ° C Roast for 1-24 hours to get A-B-C composite metal oxide

[0032] Amount added / final

product structure

La(NO 3 ) 3

(mol)

Ce(NO 3 ) 3

(mol)

Mn(NO 3 ) 2

(mol)

Sr(NO 3 ) 2

(mol)

A-B-C Composite Metal Oxide

Example 1

0.01

0

0.01

0

La2O3-Mn2O3

Example 2

0.009

0.001

0.01

0

La2O3-Mn2O3-Ce2O3

Example 3

0.009

0

0.01

0.001

La2O3-Mn2O3-SrO

Example 4

0.005

0.003

0.01

0.002

La2O3-Mn2O3-Ce2O3-SrO

[0033] 2. Preparation method of copper and iron molecular sieve catalyst

[003...

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Abstract

The present invention relates to 'compound metal oxide and nitride catalyst for low-temperature selective catalytic reduction of ammonia' and pertains to the field of catalysts. In A-B-C compound metal oxide, A is a or multiple kinds of lanthanide series metals, B is a or multiple kinds of transition metals, C is a or multiple kinds of alkaline or alkaline earth metals, A must contain La, and when C content is zero, B is not Co element alone. As proved by experiments, the compound metal oxide of the present invention can obviously raise the conversion rate from NO to NO2. When the oxide contains A, B and C elements, its activity will be higher than that only containing A and B elements. Meanwhile when this compound metal oxide of the present invention is used as a catalyst together with copper and iron molecular sieve, it may realize the function of low-temperature selective catalytic reduction of ammonia, particularly below 200 DEG C, it makes the industrialization of SCR technique simpler and more energy conserving.

Description

technical field [0001] The invention relates to an ammonia selective catalytic reduction nitride catalyst, in particular to a compound metal oxide and a catalyst suitable for nitrogen selective catalytic reduction of nitrogen compounds at low temperature. technical background [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 in 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 selection, so it...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J29/48B01J29/076B01J29/84B01D53/56B01D53/86B01D53/94
Inventor 齐共新
Owner 无锡科立泰科技有限公司
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