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Honeycomb scr catalyst supported by pyrophyllite

An SCR catalyst and carrier technology, applied in the field of nitrogen oxide post-treatment purification and environmental protection catalytic materials, to avoid longitudinal cracks, improve yield, and improve mechanical strength

Inactive Publication Date: 2015-08-26
FUJIAN ZIJIN ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no domestic literature and patent reports on the application of pyrophyllite in the field of SCR denitration catalysts

Method used

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  • Honeycomb scr catalyst supported by pyrophyllite
  • Honeycomb scr catalyst supported by pyrophyllite

Examples

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Embodiment Construction

[0024] Below in conjunction with embodiment the present invention is described in further detail:

[0025] (1) Select siliceous pyrophyllite from Shangyu, Zhejiang, and crush it to a size greater than 400 mesh.

[0026] (2) Carrier granulation. Under the stirring condition of 100 rpm, the pyrophyllite, stearic acid, lactic acid, water and ammonia water were mixed in a mass ratio of 500:1:5:170:35. Then adjust the mixing machine rotating speed to 500rpm, after material friction heats up to 60-70 DEG C, open exhaust valve drainage granulation, obtain the pyrophyllite particle of diameter 5-10mm water content 20%.

[0027] (3) Excessive layer load. Under the stirring condition of 100 rpm, the obtained pyrophyllite particles, tungsten-doped titanium dioxide, hydroxypropylmethylcellulose, polyethylene oxide and ammonia water were mixed in a mass ratio of 125:850:1:2.5:12. Then adjust the mixer to 300rpm, and load the tungsten-doped titanium dioxide on the surface of the pyrophyl...

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Abstract

The invention discloses a honeycombed SCR (selective catalytic reduction) catalyst with pyrophyllite as a carrier, belonging to the fields of nitric oxide after-treatment and purification and environment-friendly catalytic materials. The catalyst has three layers of microstructures, wherein pyrophyllite forms a carrier layer; tungsten-doped titanium dioxide (TiO2-WO3) forms a transition layer; and vanadium pentoxide (V2O5) forms an active layer. The catalyst has the beneficial effects that the negative effects of trace elements Na and K in pyrophyllite on the activity of the honeycombed SCR catalyst can be avoided by the design of the three layers of microstructures; pyrophyllite has the characteristics of low moisture expansion and high heat stability; as the carrier, pyrophyllite is favorable for improving the yield in the catalyst drying process and is favorable for improving the mechanical strength of the catalyst, and the cost of the catalyst can be also reduced by reasonably adding pyrophyllite; and the catalyst has high lateral and longitudinal mechanical strength, has denitration efficiency of more than 89% at a temperature of 270-500 DEG C, and has denitration efficiency of more than 94% at a temperature of 330-430 DEG C.

Description

technical field [0001] The invention belongs to the field of nitrogen oxide (NOx) post-treatment purification and environmental protection catalytic materials, including flue gas denitrification in thermal power, steel, cement, solid waste and petrochemical industries; in particular, it relates to a pyrophyllite-tungsten doped titanium dioxide (TiO 2 -WO 3 )-vanadium pentoxide (V 2 o 5 ) Honeycomb SCR catalyst with three-layer microstructure. Background technique [0002] Nitrogen oxides (NOx) are mainly composed of NO and NO 2 In addition to harming human health and causing acid rain, it will also aggravate urban PM2.5 pollution through atmospheric chemical reactions, which is the main pollutant that causes smog in my country. Ammonia (NH 3 ) as the reducing agent, the Selective Catalytic Reduction (SCR) technology has the highest denitrification efficiency and better economy. In the presence of the SCR denitrification catalyst, the ammonia injected into the flue gas c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/04
Inventor 石磊
Owner FUJIAN ZIJIN ENVIRONMENT ENG TECH
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