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A kind of heteropolyacid-doped cerium oxide SCR denitrification catalyst and its preparation method and application

A denitrification catalyst and heteropolyacid technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as poor adaptability of high-temperature SCR technology, low exhaust gas temperature, and difficulty in engineering transformation , to achieve the effect of facilitating market promotion, promoting SCR reaction and improving service life

Inactive Publication Date: 2019-10-29
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial SCR catalysts (such as V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 ), its active temperature window is relatively high (usually 350-420 ℃), it must be arranged between the air preheater and the economizer, and the engineering transformation is difficult
At the same time, the exhaust gas temperature of a large number of industrial boilers and kilns is low, and the adaptability of high-temperature SCR technology is not good.
In addition, vanadium compounds are biologically toxic and prone to SO 2 Oxidation to SO 3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of heteropolyacid-doped cerium oxide SCR denitration catalyst comprises the following steps:

[0027] 1) According to the mass percentage of cerium oxide 15 wt%, the mass percentage of heteropoly acid 10 wt%, anatase TiO 2 The total mass percentage of glass fiber and glass fiber is 75 wt%. Weigh cerium nitrate and phosphotungstic acid and dissolve them in deionized water respectively, and ultrasonically dissolve to obtain its aqueous solution;

[0028] 2) Take the aqueous solution obtained in step 1), anatase TiO 2 Carrier, glass fiber, methyl cellulose, polyoxyethylene, stearic acid, pulp cotton, lactic acid are mixed according to the mass ratio of 350: 20: 2.5: 2.8: 1: 2.3: 3.5 and put in the mixer, and add ammonia water to stir Uniform and stale for 24 hours to obtain catalyst sludge with a pH value of 8 to 9 and a water content of 20% to 30%;

[0029] 3) The catalyst sludge obtained in step 2) is filtered and extruded to obtain a honeycomb S...

Embodiment 2

[0033]The preparation method of heteropolyacid-doped cerium oxide SCR denitration catalyst comprises the following steps:

[0034] 1) According to the mass percentage of cerium oxide 10 wt%, the mass percentage of heteropoly acid 10 wt%, anatase TiO 2 The total mass percentage of glass fiber and glass fiber is 80 wt%. Weigh cerium acetate and phosphotungstic acid and dissolve them in deionized water respectively, and ultrasonically dissolve to obtain its aqueous solution;

[0035] 2) Take the aqueous solution obtained in step 1), anatase TiO 2 Carrier, glass fiber, sodium carboxymethyl cellulose, ethanolamine, stearic acid, pulp cotton, lactic acid are mixed according to the mass ratio of 340: 27.5: 2: 2.5: 1: 2: 3 and placed in a mixer, and ammonia water is added to stir Uniform and stale for 24 hours to obtain catalyst sludge with a pH value of 8 to 9 and a water content of 20% to 30%;

[0036] 3) The catalyst sludge obtained in step 2) is filtered and extruded to obtain a...

Embodiment 3

[0040] The preparation method of heteropolyacid-doped cerium oxide SCR denitration catalyst comprises the following steps:

[0041] 1) According to the mass percentage of cerium oxide 5 wt%, the mass percentage of heteropoly acid 15 wt%, anatase TiO 2 and the total mass percentage of glass fiber is 80 wt%, weigh cerium nitrate and phosphotungstic acid and dissolve them in deionized water respectively, and ultrasonically dissolve to obtain its aqueous solution;

[0042] 2) Take the aqueous solution obtained in step 1), anatase TiO 2 Carrier, glass fiber, sodium carboxymethyl cellulose, polyoxyethylene, salad oil, pulp cotton, and lactic acid are mixed and placed in a mixer at a mass ratio of 360:24:3:3.3:1:2.5:4.5, and ammonia water is added Stir evenly and stale for 24 hours to obtain catalyst sludge with a pH value of 8 to 9 and a water content of 20% to 30%;

[0043] 3) The catalyst sludge obtained in step 2) is filtered and extruded to obtain a honeycomb SCR catalyst wet ...

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Abstract

The invention discloses a heteropoly-acid-doped cerium oxide SCR denitration catalyst. The heteropoly-acid-doped cerium oxide SCR denitration catalyst is characterized in that heteropoly acid is Keggin-type phosphotungstic acid HPW, and the doped amount of the heteropoly acid is 5wt% to 15wt%. According to the catalyst, anatase TiO2 serves as a carrier, a mixture of cerium oxide CeO2 and the Keggin-type phosphotungstic acid HPW loaded to the carrier serves as an active component, and the catalyst is represented as CeO2-HPW / TiO2. The catalyst contains the following ingredients by content: 65wt% to 85wt% of TiO2 and glass fibers, 5wt% to 20wt% of CeO2 and 5wt% to 15wt% of HPW. The invention further discloses a preparation method for the catalyst and an application of the catalyst. The catalyst has relatively high catalytic oxidation-reduction power and acidic sites and achieves relatively high catalyst reaction activity at relatively low reaction temperatures, so that the low-temperature denitration efficiency and sulfur resistance are effectively improved.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and relates to a medium-low temperature SCR denitrification reaction catalyst, in particular to a heteropolyacid-doped cerium oxide SCR denitrification catalyst and its preparation method and application. Background technique [0002] Nitrogen oxide (NOx) is a major air pollutant, which not only causes a series of ecological environmental problems, such as photochemical smog, acid rain, ozone depletion, greenhouse effect, etc., but also causes great harm to human health. The reduction and control of nitrogen oxides has become a research hotspot and focus in the field of global air pollution prevention and control. [0003] Selective catalytic reduction (SCR) technology is considered to be an effective method for removing nitrogen oxides emitted from stationary sources, and has achieved large-scale industrial applications. Commercial SCR catalysts (such as V 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2255/2065B01J27/188
Inventor 温明英胡建锋吴晓东吴新谦
Owner LONGYAN ZIJIN INNOVATION RES INST
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