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Low-temperature SCR (selective catalytic reduction) denitration catalyst and preparation and application method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of industrial application of deactivated low-temperature catalysts, etc., to reduce the scale of denitrification reactors, Stable denitrification effect, high water and sulfur resistance effect

Active Publication Date: 2017-06-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on low-temperature denitration catalysts mostly focuses on transition metal oxides with high redox performance, but in H 2 O and SO 2 Severe deactivation under the condition of coexistence is still a key problem that limits the real industrial application of this kind of low-temperature catalysts

Method used

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  • Low-temperature SCR (selective catalytic reduction) denitration catalyst and preparation and application method thereof
  • Low-temperature SCR (selective catalytic reduction) denitration catalyst and preparation and application method thereof
  • Low-temperature SCR (selective catalytic reduction) denitration catalyst and preparation and application method thereof

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Embodiment 1

[0035] This embodiment provides a method for preparing a novel SCR low-temperature denitrification granular catalyst with a proportion included in this patent, which includes the following steps:

[0036] (1) Weigh 0.772g of ammonium metavanadate, 1.66g of oxalic acid, 0.984g of ammonium molybdate tetrahydrate, 1.62g of niobium oxalate and 0.82g of antimony acetate, dissolve them in 50mL of deionized water, and transfer them to a 500mL eggplant-shaped flask , the volume of the solution after washing the beaker is about 80mL;

[0037] (2) Weigh 17.8g of commercial titanium dioxide, add it into an eggplant-shaped flask with a precursor solution, shake and mix evenly, and ensure that the powder is evenly dispersed in the solution without agglomeration;

[0038] (3) Put the eggplant-shaped flask on a rotary evaporator, immerse the flask in a 50°C water bath and rotate, and complete the impregnation and drying under vacuum conditions;

[0039] (4) After the water in the flask is c...

Embodiment 2

[0043] Take a sufficient amount of the precursor powder prepared in Example 1, add an appropriate amount of water, ammonia, ethanolamine and stearic acid in a small kneader for preliminary mixing, add glass fiber, kapok and other additives after 20 minutes and continue kneading for 30 minutes Then add the binder (carboxymethyl cellulose CMC and polyethylene oxide PEO) for the final reverse kneading, break up the binder and repeatedly combine with the mud, and finally obtain the ideal mud after 60 minutes of continuous kneading. Put the mud that meets the performance requirements on the pre-extrusion machine, and remove the air in the mud through continuous extrusion, so that the mud is more dense and meets the extrusion requirements. After 24 hours of staleness, the mud is passed through a specific extrusion die, extruded on a continuous screw extruder to obtain a honeycomb catalyst body with a wall thickness of 0.6mm and a pitch of 3.6mm, and finally dried (humidity-reducing d...

Embodiment 3

[0047] This embodiment utilizes the molded catalyst sample piece prepared in embodiment 2 to carry out lower SO 2 Content (30ppm) under the long-term performance test.

[0048] The test results show that the catalyst activity has not decreased significantly under the condition of long-term operation of up to 20 hours. Figure 7 .

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Abstract

The invention discloses a low-temperature SCR (selective catalyst reduction) denitration catalyst and a preparation application method thereof. The catalyst is characterized in that vanadium oxide is taken as a main active component, the content of the vanadium oxide accounts for 3-8wt.% of the total quality of the catalyst, one or more of Mo, Sb and Nb is taken as an assistant, the content of assistant elements accounts for 1-10wt.% of the total quality of the catalyst, and anatase titanium dioxide (TiO2) is taken as a carrier. Precursor powder of the catalyst is prepared with a multiple equivalent-volume impregnation or rotary-evaporation assisted impregnation method and is kneaded by added assistants of a binder, an extrusion aid, a thickening agent and the like, an entire honeycomb billet is obtained via mud refining, staling, aging and extruding, and the narrow-spacing thin-wall-thickness low-temperature SCR honeycomb monolithic catalyst is obtained finally via drying and calcinating. The experiment result shows that the prepared catalyst has good denitration activity at the low temperature range of 150-275DEG C; long-term stable use of the catalyst under different industrial environments can be guaranteed through the technological process of reasonable selection combination of proper space gas velocity and ammonia nitrogen ratio.

Description

technical field [0001] The invention relates to a formula, a preparation method and an application mode of a low-temperature denitration catalyst, belonging to the technical field of industrial denitration. Background technique [0002] Coal still occupies a large proportion in my country's energy structure, and combustion is its main form of utilization. Whether it is a typical coal-fired power plant or a small industrial coal-fired boiler, there are inevitably different concentrations of nitrogen oxides (NO x ). Nitrogen oxides are one of the main sources of air pollution, which can lead to many environmental problems such as acid rain, photochemical smog, and smog. At the same time, they may directly endanger human health and cause diseases of the respiratory system and nervous system. For the removal of nitrogen oxides from stationary sources, the selective catalytic reduction technology using ammonia as the reducing agent is currently the most widely used and mature m...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01J23/002B01J23/28B01J2523/00B01J2523/53B01J2523/55B01J2523/68B01J2523/47Y02A50/20
Inventor 仲兆平朱林王丽霞
Owner SOUTHEAST UNIV
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