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Novel method for preparing iron-sulfur-titanium-based NH<3>-SCR denitrification catalyst

A technology of NH3-SCR, denitration catalyst, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low experimental space velocity and low activity, and achieve wide temperature range, high activity, improved active effect

Active Publication Date: 2018-12-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the catalyst containing titanium, iron and other oxides invented by this patent has a NO conversion rate of over 80% between 250 and 450 °C and exhibits certain activity in a wide temperature range, the experimental space velocity is low, only 10770 h- 1. The activity is much lower than that of the industrially used VOx-WOx / TiO2 catalytic system

Method used

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  • Novel method for preparing iron-sulfur-titanium-based NH&lt;3&gt;-SCR denitrification catalyst
  • Novel method for preparing iron-sulfur-titanium-based NH&lt;3&gt;-SCR denitrification catalyst
  • Novel method for preparing iron-sulfur-titanium-based NH&lt;3&gt;-SCR denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2.48g TiOSO4 and 0.125 g FeSO4 into 40 ml deionized water, dissolve until the solution is clear and transparent, adjust the pH to 0.8 with sulfuric acid, then put it in an oil bath at 90°C, hydrolyze and precipitate for 4h, stop heating, and cool to room temperature. The product was subjected to vacuum filtration, and the filter cake was dried at 100 °C for 12 h, and finally calcined at 500 °C for 2 h at a heating rate of 2 °C / min. After roasting and cooling, the iron-titanium-based high-temperature NH3-SCR denitration catalyst was obtained. The mass fraction of iron in the prepared catalyst was 2.5%, and the content of sulfur was 3.2%.

[0024] Take 0.2 g of the catalyst prepared in this example and place it in a fixed-bed reactor with an inner diameter of 0.6 mm. The volume space velocity is 60000 h-1, and the concentrations of NO and NH3 are both 800 ppm. The catalytic effect is as follows: Figure 1 , in the range of 325~525℃, the denitrification efficiency is 9...

Embodiment 2

[0026] This embodiment is to change the pH of hydrolysis precipitation on the basis of embodiment 1.

[0027] Add 2.48g TiOSO4 and 0.125 g FeSO4 into 40 ml deionized water, dissolve until the solution is clear and transparent, adjust the pH to 1.3 with sulfuric acid, then put it in an oil bath at 90°C, hydrolyze and precipitate for 4h, stop heating, and cool to room temperature. The product was subjected to vacuum filtration, and the filter cake was dried at 100 °C for 12 h, and finally calcined at 500 °C for 2 h at a heating rate of 2 °C / min. After roasting and cooling, the iron-titanium-based high-temperature NH3-SCR denitration catalyst was obtained. The mass fraction of iron element in the prepared catalyst was 3.0%, and the content of sulfur element was 3.5%.

[0028] Take 0.2 g of the catalyst prepared in this example and place it in a fixed-bed reactor with an inner diameter of 0.6 mm. The volume space velocity is 60000 h-1, and the concentrations of NO and NH3 are both...

Embodiment 3

[0030] The present embodiment changes the consumption of ferric sulfate on the basis of embodiment 1.

[0031] Add 2.48g TiOSO4 and 0.250 g FeSO4 into 40 ml deionized water, dissolve until the solution is clear and transparent, adjust the pH to 0.8 with sulfuric acid, then put it in an oil bath at 90°C, hydrolyze and precipitate for 4h, stop heating, and cool to room temperature. The product was subjected to vacuum filtration, and the filter cake was dried at 100 °C for 12 h, and finally calcined at 500 °C for 2 h at a heating rate of 2 °C / min. After roasting and cooling, the iron-titanium-based high-temperature NH3-SCR denitration catalyst was obtained. The mass fraction of iron element in the prepared catalyst was 4%, and the content of sulfur element was 3.9%.

[0032] Take 0.2 g of the catalyst prepared in this example and place it in a fixed-bed reactor with an inner diameter of 0.6 mm. The volume space velocity is 60000 h-1, and the concentrations of NO and NH3 are both ...

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Abstract

The invention discloses a novel method for preparing an iron-sulfur-titanium-based NH<3>-SCR flue gas denitrification catalyst by utilizing the high-temperature pyrohydrolysis of acidic iron titaniumsulfate solution. The preparation method for the iron-sulfur-titanium-based catalyst is as follows: firstly, titanyl sulfate and ferric sulfate are utilized to for preparinge different concentrationsof titanium iron solutions; secondly, under certain temperature and pH, the titanium iron solutions undergoare subjected hydrolytic precipitation for a certain time; and finally, hydrolysates are filtered by suction, dried and roasted. According to the invention, by regulating preparation conditions, a novel high-activity iron-sulfur-titanium-based catalyst can be obtained. The catalyst appears asan anatase type TiO<2> crystal structure, iron exists in a Fe-O-Ti chemical bond structure form, and the sulfur element appears as plus 6 valence. In an activity test, under high space velocity (60000h<-1>), within a range from 325 DEG C to 500 DEG C, the NO conversion rate can reach 90 percent or moreabove, N2 selectivity can reach 98 percent or moreabove, and therefore the iron-sulfur-titanium-based NH<3>-SCR denitrification catalyst has a great potential to replace the V-W(Mo)-Ti catalytic system which is widely used at present, and can be applied to the denitrification of stationary sources with coal-fired industrial power plants as a representative.

Description

technical field [0001] The invention relates to a new method for preparing iron-sulfur-titanium-based high-temperature NH3-SCR denitration catalyst. The catalyst is prepared by high-temperature thermal hydrolysis co-precipitation of acidic titanium-iron sulfate solution, and is mainly used in NH3-SCR represented by coal-fired thermal power Denitrification. Background technique [0002] Nitrogen oxides are likely to cause photochemical smog, acid rain, the hole in the ozone layer, PM2.5 and other environmental problems. With the increasing demand for energy in our country, the consumption of coal remains high, and the problem of nitrogen oxide pollution is becoming more and more obvious. Ammonia-selective catalytic reduction (SCR) nitrogen oxides (NOx) is the most widely used NOx emission control technology for stationary sources such as power plants and industrial boilers. Commercially, supported VOx-WOx / TiO2 catalysts have been used for a long time. However, the N2 select...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2258/0283B01J27/053
Inventor 梁斌宋磊岳海荣刘长军唐思扬李春
Owner SICHUAN UNIV
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