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Low-temperature water-resistant SCR denitration catalyst and preparation method thereof

A denitrification catalyst and low-temperature technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of manganese-based catalysts, such as poor sulfur resistance and water resistance, and cannot be truly applied in the field of denitrification treatment. The effect of operation, low activation temperature, and simple preparation method

Pending Publication Date: 2020-10-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defect of poor sulfur and water resistance of manganese-based catalysts prevents them from being really applied in the field of denitration treatment.

Method used

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  • Low-temperature water-resistant SCR denitration catalyst and preparation method thereof
  • Low-temperature water-resistant SCR denitration catalyst and preparation method thereof
  • Low-temperature water-resistant SCR denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing a low-temperature water-resistant SCR denitration catalyst, comprising the following steps:

[0028] (1) Take by weighing 4.5kg titanium dioxide, 0.147kg manganese nitrate, 0.011kg holmium acetate, 0.016kg cerium nitrate, 0.216kg iron nitrate by stoichiometric ratio;

[0029] (2) Add the weighed manganese nitrate, holmium acetate, cerium nitrate, and ferric nitrate into 200mL deionized water, stir at 20°C for 20min at a speed of 40r / min, and then ultrasonically mix at a frequency of 20kHz to obtain activity component mixture;

[0030] (3) Add 1800mL of deionized water to the titanium dioxide and continue to stir. After 1 hour of mixing, a uniform titanium dioxide mud mass is obtained;

[0031] (4) Slowly pour the active component mixture into the titanium dioxide mud mass, stir at a rate of 40r / min for 3h, add glass fiber, kapok, carboxymethyl cellulose, glycerin successively, continue to stir for 0.5h, and let it stand 12h, control the mass rat...

Embodiment 2

[0036] A method for preparing a low-temperature water-resistant SCR denitration catalyst, comprising the following steps:

[0037] (1) Take by weighing 4.5kg titanium dioxide, 5.02kg manganese acetate, 0.267kg holmium nitrate, 0.110kg cerium oxide, 0.419kg cobalt nitrate by stoichiometric ratio;

[0038] (2) Add the weighed manganese acetate, holmium nitrate, cerium oxide, and cobalt nitrate into 600mL deionized water, stir at 30°C for 30min at a speed of 120r / min, and then ultrasonically mix at a frequency of 60kHz to obtain the active group sub-mixture;

[0039] (3) Add 1200mL deionized water to the titanium dioxide and continue to stir. After 3 hours of mixing, a uniform titanium dioxide mud mass is obtained;

[0040] (4) Slowly pour the active component mixture into the titanium dioxide mud mass, stir at a rate of 120r / min for 5h, add glass fiber, kapok, carboxymethyl cellulose, glycerin successively, continue to stir for 2h, then let stand for 24h , control the mass rat...

Embodiment 3

[0045] A method for preparing a low-temperature water-resistant SCR denitration catalyst, comprising the following steps:

[0046] (1) Take by weighing 4.5kg titanium dioxide, 0.937kg manganese monoxide, 0.010kg holmium oxide, 0.028kg cerium nitrate, 0.085kg copper nitrate by stoichiometric ratio;

[0047] (2) Add the weighed manganese monoxide, holmium oxide, cerium nitrate, and copper nitrate into 400mL deionized water, stir at 25°C for 25min at a speed of 80r / min, and then ultrasonically mix at a frequency of 40kHz to obtain activity component mixture;

[0048] (3) Add 1500mL deionized water to the titanium dioxide and continue to stir. After 2 hours of mixing, a uniform titanium dioxide mud mass is obtained;

[0049] (4) Slowly pour the active component mixture into the titanium dioxide mud mass, stir for 4 hours at a rate of 80r / min, add glass fiber, kapok, carboxymethyl cellulose, glycerin successively, continue to stir for 1.2 hours, and let it stand 18h, control the ma...

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Abstract

The invention discloses a low-temperature water-resistant SCR denitration catalyst and a preparation method thereof. The catalyst takes titanium dioxide as a carrier, takes a manganese oxide as an active ingredient, and takes a holmium oxide, a cerium oxide and a transition metal oxide as cocatalysts; wherein the transition metal oxide is one or more of an iron oxide, a cobalt oxide, a copper oxide and a vanadium oxide, and the molar ratio of titanium to manganese to holmium to cerium to the transition metal is 1: (0.01-0.25): (0.001-0.01): (0.001-0.02): (0.01-0.03). The invention discloses apreparation method of the low-temperature water-resistant SCR denitration catalyst. According to the invention, oxides of various rare earth elements and transition metal elements are added; the low-temperature water-resistant SCR denitration catalyst is prepared by reasonably setting the mass ratio of the active component manganese to the auxiliary components in the catalyst and adopting an ultrasonic-enhanced auxiliary means, has the characteristics of low activation temperature, high catalytic activity and wider reaction temperature window, has higher water resistance, and is wider in application range.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a low-temperature water-resistant SCR denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, most of the existing coal-fired power plants have installed corresponding denitrification facilities, and the flue gas has reached the emission standard. The non-electricity industry has become an important field for nitrogen oxide control. NH 3 -SCR technology is currently one of the most widely used and most mature flue gas denitrification technologies, and the catalyst is the core of the technology. At present, most commercial catalysts are V 2 o 5 -WO 3 / TiO 2 Catalyst, its working temperature is generally in the range of 300 ~ 400 ℃. However, the flue gas temperature of this kind of flue gas is generally 120°C to 180°C, and the existing catalysts cannot be directly applied, so improving the low-temperature catalytic activity of the catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01J37/04B01J37/08B01J37/34B01D53/86B01D53/56
CPCB01J37/343B01J37/04B01J37/08B01J23/002B01J23/8892B01J23/34B01D53/8628B01J2523/00B01J2523/3712B01J2523/3768B01J2523/47B01J2523/72B01J2523/842B01J2523/845B01J2523/17B01J2523/55
Inventor 张亚平吴鹏沈凯肖睿李国波
Owner SOUTHEAST UNIV
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