Honeycomb-like cerium-zirconium-titanium-based denitration catalyst and preparation method thereof

A denitrification catalyst, cerium-zirconium-titanium technology, applied in the field of denitrification catalysts, can solve the problems of high catalyst toxicity, environmental secondary pollution, short service life of catalysts, etc., to increase stability and oxygen storage capacity, widen the temperature window, and improve activity Effect

Inactive Publication Date: 2016-03-30
SHANGHAI LANGT AUTOCATALYST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problem is that the catalyst prepared by impregnation method has a short service life and cannot adapt to various working conditions.
However, the problem is that the high-temperature activity is low, and it cannot be applied to high-temperature conditions.
[0008] The denitrification catalysts prepared by the above existing technologies all have good denitrification activities, but the use of V 2 o 5 Catalysts prepared as active components have high toxicity and potential secondary pollution to the environment; catalysts prepared by impregnation with rare earth metal oxides as active components have problems such as short service life and inapplicability to various working conditions

Method used

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  • Honeycomb-like cerium-zirconium-titanium-based denitration catalyst and preparation method thereof
  • Honeycomb-like cerium-zirconium-titanium-based denitration catalyst and preparation method thereof
  • Honeycomb-like cerium-zirconium-titanium-based denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 50Kg of cerium nitrate and 30Kg of zirconium nitrate, add 100Kg of deionized water, and dissolve at 80°C to form an active component solution. Put 600Kg titanium dioxide, 2Kg wood pulp, 35.5Kg glass fiber, 6.5Kg turmeric powder, 4.2Kg stearic acid, 9.125Kg fumed silica, 350Kg deionized water into the mixer with the above-mentioned active component solution, Add ammonia water to the mud during the mixing process to adjust the pH of the mud to 9.2. Then, put the obtained mud into a filter for 12 hours of aging, and filter, and put the filtered mud into a pre-extrusion machine for pre-extrusion. The pre-extruded mud material was stale for 24 hours and then added to a vacuum extruder for extrusion molding. The vacuum degree of the vacuum extruder was 0.5 MPa, and the extrusion pressure was 3.5 MPa to obtain a honeycomb green body. After that, put the green body into the 2 In an air-permeable carton of ×24hr, drying was performed at a temperature of 50°C for 10 days,...

Embodiment example 2

[0039]Weigh 50Kg of cerium nitrate and 41.7Kg of zirconium nitrate, add 115Kg of deionized water, dissolve at 80°C and use as active component solution for later use. Put 600Kg titanium dioxide, 2Kg wood pulp, 35.5Kg glass fiber, 6.5Kg turmeric powder, 4.2Kg stearic acid, 9.125Kg fumed silica, 350Kg deionized water into the mixer with the above-mentioned active component solution, Add ammonia water to the mud during the mixing process to adjust the pH of the mud to 9.2. Then, put the obtained mud into a filter for 12 hours of aging, and filter, and put the filtered mud into a pre-extrusion machine for pre-extrusion. The pre-extruded mud material was stale for 24 hours and then added to a vacuum extruder for extrusion molding. The vacuum degree of the vacuum extruder was 0.5 MPa, and the extrusion pressure was 3.5 MPa to obtain a honeycomb green body. After that, put the green body into the 2 In an air-permeable carton of ×24hr, drying was performed at a temperature of 50°C f...

Embodiment example 3

[0042] Weigh 50Kg of cerium nitrate and 41.7Kg of zirconium nitrate, add 115Kg of deionized water, and dissolve at 80°C as the active component solution for later use. Put 600Kg titanium dioxide, 2Kg wood pulp, 35.5Kg glass fiber, 6.5Kg turmeric powder, 4.2Kg stearic acid, 9.125Kg fumed silica, 350Kg deionized water into the mixer with the above-mentioned active component solution, Add ammonia water to the mud during the mixing process to adjust the pH of the mud to 11. Then, put the obtained mud into a filter for 12 hours of aging, and filter, and put the filtered mud into a pre-extrusion machine for pre-extrusion. The pre-extruded mud material was stale for 24 hours and then added to a vacuum extruder for extrusion molding. The vacuum degree of the vacuum extruder was 0.5 MPa, and the extrusion pressure was 3.5 MPa to obtain a honeycomb green body. After that, put the green body into the 2 In an air-permeable carton of ×24hr, drying was performed at a temperature of 50°C f...

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Abstract

The present invention provides a honeycomb-like cerium-zirconium-titanium-based denitration catalyst and a preparation method thereof, and the honeycomb-like cerium-zirconium-titanium-based denitration catalyst is prepared by the steps of preparation of a mud material, filtration and pre-squeezing, preparation of a denitration mud blank, and calcination. The honeycomb-like cerium-zirconium-titanium-based denitration catalyst is non-toxic and environmentally friendly, the boiler flue gas NOx removal rate can reach 90% in a 150-420 DEG C temperature window.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a honeycomb cerium-zirconium-titanium-based denitration catalyst and a preparation method thereof. Background technique [0002] my country's coal-fired power plants emit a large amount of nitrogen oxides, and the existence of nitrogen oxides will cause acid rain, photochemical smog, ozone layer holes and other hazards. Therefore, in the face of increasingly stringent nitrogen oxide emission standards, we have developed a Flue gas denitrification technology is of great significance to my country's environmental pollution control. At present, the widely used and mature nitrogen oxide control technology is selective catalytic reduction (SCR) denitrification technology, in which the cost of catalyst accounts for 40% to 60% of the total investment of SCR denitrification projects. It can be seen that catalyst is the core of SCR denitrification technology and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/56
Inventor 周坚刚
Owner SHANGHAI LANGT AUTOCATALYST
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