Preparation method and application of low temperature denitration Ni-based composite oxide cellular monolithic catalyst

A composite oxide and integral catalyst technology, applied in the field of environmental catalytic purification, can solve problems such as erosion, catalyst blockage, and reduced catalyst service life, and achieves a simple preparation process, wide low-temperature denitration performance, and good water and sulfur resistance. Effect

Active Publication Date: 2016-03-16
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flue gas usually contains high concentrations of dust, SO 2 And a certain concentration of alkali metals, arsenic, mercury and other substances will have a strong blockage, erosion and poisoning effect on the catalyst, thereby reducing the service life of the catalyst
In addition, existing boilers usually do not reserve denitrification space, which also limits the industrial application of SCR technology

Method used

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  • Preparation method and application of low temperature denitration Ni-based composite oxide cellular monolithic catalyst
  • Preparation method and application of low temperature denitration Ni-based composite oxide cellular monolithic catalyst
  • Preparation method and application of low temperature denitration Ni-based composite oxide cellular monolithic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Synthesis of Ni-based composite oxide powder catalyst precursor by uniform co-precipitation method

[0022] (1) Weigh 686.0gMn(CH 3 COO) 2 2H 2 O, 348.9gNi(NO 3 ) 2 2H 2 O, 99.8gCu(CH 3 COO) 2 2H 2 O, 104.9gFe(NO 3 ) 3 9H 2 O, 124.5gCo(CH 3 COO) 2 2H 2 O, 164.5gCe(NH 4 ) 2 (NO 3 ) 6 , dissolved in 10L of deionized water, and stirred until the solution was completely clear to prepare a mixed salt solution. Weigh 961.0gCO(NH 2 ) 2 Dissolve in 10L deionized water and stir until the solution is completely clear.

[0023] (2) Mix the salt solution and CO(NH 2 ) 2 The solution was transferred to a powder catalyst preparation reactor, mixed evenly, and reacted at 60° C. under continuous stirring for 5 hours to obtain a yellow-green product.

[0024] (3) The yellow-green product was washed several times with deionized water, centrifuged, and dried at 70° C. for 12 hours to obtain a Ni-based composite oxide catalyst powder precursor.

Embodiment 2

[0025] Embodiment 2: Preparation of Ni-based composite oxide honeycomb monolithic catalyst

[0026] (1) Take 240.0g of the Ni-based composite oxide catalyst powder precursor synthesized in Example 1 and mix evenly with 30.0g of pseudo-boehmite, 15g of silicon oxide, and 15g of turnip powder, and mix 120ml of dilute Nitric acid solution (6.8vol.%) was added to the above mixture and kneaded for 4h. Transfer the kneaded plastic material to a vacuum mud mixer to remove excess moisture and gas from the material. The material obtained after mud refining is put into the extruder, and the monolithic catalyst green body is extruded by a honeycomb stainless steel die.

[0027] (2) Air-dry the extruded integral catalyst body in a cool place, and then dry it at 70°C for 24h. After the integral catalyst body is fully dried, it is calcined at 550°C for 4h, and the heating rate is 10°C / min to prepare a Ni-based composite oxide honeycomb monolithic catalyst.

Embodiment 3

[0028] Embodiment 3: the test of overall catalyst reactivity changing with reaction temperature

[0029] A honeycomb monolithic catalyst with a length of 50 mm and an outer diameter of 12 mm was placed in a flue gas simulation reaction device to test the NO removal effect of the monolithic catalyst under different temperature conditions. The composition of the simulated flue gas was 480ppmNO, 480ppmNH 3 , 15vol.%O 2 , He is the balance gas, and the air velocity of the simulated flue gas is 6,500h -1 . Ni-Based Composite Oxide Honeycomb Monolithic Catalysts for NO x The change curve of conversion rate with temperature is as follows: figure 1 shown.

[0030] The reaction results show that with the increase of the reaction temperature, the NO of the monolithic catalyst x The conversion rate gradually increased. The Ni-based composite metal oxide honeycomb monolithic catalyst has a specific wide temperature operating window, and its NO in the temperature range of 80-320 ° C ...

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Abstract

The invention provides a preparation method and application of a low temperature denitration Ni-based composite oxide cellular monolithic catalyst, and belongs to the technical field of environment catalysis and purification. The cellular monolithic catalyst mainly comprises an active component, a binding agent and an extrusion aid. The active component is a Ni-based composite metal oxide, the binding agent is prepared from pseudo-boehmite, a silicon oxide and dilute nitric acid, and the extrusion aid is sesbania powder. The monolithic catalyst has the good low temperature denitration performance and wide temperature operation window, the NOx conversion rate can reach 80% or above in the temperature range of 80-320 DEG C, and the catalyst has the high operation stability, good sulfur and water resistance and high application value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental catalytic purification, and relates to a preparation method of a Ni-based composite oxide honeycomb monolithic catalyst and its application in low-temperature flue gas denitration reaction. Background technique [0002] Nitrogen oxides (NO x ) as an important air pollutant is one of the main causes of environmental problems such as acid rain, photochemical smog, ozone layer depletion, and haze weather. NO that can cause air pollution x Mainly NO and NO 2 . In terms of harm to the human body, NO has a strong affinity with hemoglobin. 2 The affinity with hemoglobin is 300,000 times, so excessive NO inhalation will damage the central nervous system of the human body, causing convulsions and paralysis; in addition, NO has carcinogenic effects and can cause adverse effects on cell division and the transmission of genetic information. NO 2 The main impact on human health is to strongly stimu...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 李新勇刘洁戴云峰王路敏孙文博李宏智王晓梅肇启东
Owner DALIAN UNIV OF TECH
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