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A kind of spherical SCR denitration catalyst and preparation method thereof

A denitrification catalyst, spherical technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of sulfur poisoning, low activity, easy clogging, etc., to avoid poisoning and restore catalysis Reactive, easy-to-repair effect

Active Publication Date: 2019-03-01
南京德普瑞克环保科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above situation, the present invention aims to provide a novel spherical SCR denitrification catalyst and its preparation method to overcome the problems of low activity, easy clogging and sulfur poisoning in existing honeycomb denitrification catalysts.

Method used

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  • A kind of spherical SCR denitration catalyst and preparation method thereof
  • A kind of spherical SCR denitration catalyst and preparation method thereof
  • A kind of spherical SCR denitration catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] Example 1: Preparation of spherical SCR denitration catalyst.

[0039] Turn on the piping machine, add γ-alumina (66g), nitric acid (6.6g) and sodium carboxymethyl cellulose (13.2g) to it in sequence, make the above materials roll quickly in the piping machine, and gradually form a core with a diameter of 16mm (82.5g).

[0040] After the core is formed, the mixed powder containing γ-alumina (34g), titanium dioxide (23.8g), tungsten trioxide (3.4g) and dysprosium trioxide (6.8g), nitric acid (6.8g) is added to the binding machine in sequence. g) and sodium carboxymethyl cellulose (13.6g), make the above materials quickly roll in the edging machine and wrap the core, gradually forming an outer film with a thickness of 2mm, turn off the edging machine, and take out the spherical material (162.7g, diameter of 20mm).

[0041] First put the spherical material in an oven and dry it at 120°C for 8 hours, then put the dried spherical material in a roasting furnace, and roast accordin...

Embodiment 2

[0045] Example 2: Preparation of spherical SCR denitration catalyst.

[0046] Turn on the piping machine, add γ-alumina (60g), nitric acid (6g) and sodium silicate (12g) to it in sequence, make the above-mentioned materials roll quickly in the piping machine, and gradually form a core with a diameter of 14mm.

[0047] After the core is formed, a mixed powder containing γ-alumina (40g), titanium dioxide (28g), tungsten trioxide (4g) and dysprosium trioxide (8g) is added to the binding machine (which also contains a small amount of five Vanadium oxide, molybdenum trioxide and manganese dioxide, and the weight percentages of vanadium, molybdenum, and manganese are respectively 1%, 5%, and 8%), nitric acid (8g) and sodium silicate (16g) to make the above materials Quickly roll and wrap the inner core in the hemming machine to gradually form an outer film with a thickness of 3mm. Turn off the hemming machine and take out the spherical material (20mm in diameter) from it.

[0048] First p...

Embodiment 3

[0052] Example 3: Preparation of spherical SCR denitration catalyst.

[0053] Turn on the piping machine, add γ-alumina (66g), nitric acid (6.6g) and sodium carboxymethyl cellulose (13.2g) to it in sequence, make the above materials roll quickly in the piping machine, and gradually form a core with a diameter of 16mm .

[0054] After the core is formed, a mixed powder containing γ-alumina (34g), titanium dioxide (23.8g), tungsten trioxide (3.4g) and dysprosium trioxide (6.8g) is added to the binding machine (which also contains a small amount of Of vanadium pentoxide, molybdenum trioxide and manganese dioxide, and the weight percentages of vanadium, molybdenum and manganese are respectively 1%, 5%, 8%), nitric acid (6.8g) and sodium silicate (13.6g) , Make the above-mentioned materials quickly roll in the hemming machine and wrap the inner core to gradually form an outer film with a thickness of 2mm, turn off the hemming machine, and take out the spherical material (diameter 20mm)...

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Abstract

The invention belongs to the technical field of industrial catalysts and relates to a spherical SCR denitration catalyst and a preparation method thereof. Specifically, the preparation method of the present invention includes the following steps: 1) using γ-alumina, nitric acid and a binder to prepare an inner core; 2) using a mixed powder of metal oxides, nitric acid and a binder to prepare an outer membrane; 3 ) First drying and roasting; 4) Soaking in vanadium oxalate aqueous solution and second drying and roasting. The spherical SCR denitration catalyst prepared by this method can not only overcome the clogging problem of the honeycomb catalyst and extend the service life of the catalyst, but also can carry out catalytic reactions in a fluidized state. Through the mutual collision between the spheres, the active sites on the surface of the spheres are covered. Toxic substances will fall off to avoid catalyst poisoning. In addition, when the active coating (outer film) on the outer surface of the spherical SCR denitration catalyst falls off too much, it can be recoated to restore its catalytic activity at the lowest cost.

Description

Technical field [0001] The invention belongs to the technical field of industrial catalysts, and relates to a spherical SCR denitration catalyst and a preparation method thereof. Background technique [0002] At present, the denitration catalyst commonly used in industry is mainly cordierite-based honeycomb catalyst, and its preparation process is powder mixing and forming at one time. Since the process is to completely mix the active components with the powder before molding, the active components are evenly distributed on the surface of the pores and inside the carrier, so that a large number of active components in the interior cannot really play a catalytic role, resulting in the function of the active components Waste, making the overall denitration efficiency of the catalyst decrease. In addition, because the surface of the catalyst is honeycomb-shaped, the dust contained in the industrial waste gas will block the pores after a period of time, causing the resistance of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J35/08B01D53/86B01D53/54
CPCB01D53/8621B01J23/002B01J23/34B01D2255/2092B01D2255/90B01J2523/00B01J35/51B01J2523/31B01J2523/41B01J2523/47B01J2523/3762B01J2523/55B01J2523/69B01J2523/68B01J2523/72B01J2523/12
Inventor 李纪委黄盼
Owner 南京德普瑞克环保科技股份公司