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Denitration catalyst material, and preparation method and application thereof

A denitrification catalyst and substrate technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easy loss of heavy metal vanadium, secondary pollution of the environment, high operating costs, etc., to achieve low cost and avoid Secondary pollution, the effect of improving catalytic activity

Active Publication Date: 2017-01-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing cost of this type of catalyst is relatively high, and core technologies such as integral catalyst molding and preparation processes rely on foreign imports, resulting in high operating costs in the domestic denitrification market; at the same time, the main active component, heavy metal vanadium, is easily Loss, produce hazardous heavy metal waste, causing serious secondary pollution to the environment

Method used

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  • Denitration catalyst material, and preparation method and application thereof
  • Denitration catalyst material, and preparation method and application thereof
  • Denitration catalyst material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]Take about 25g of red mud sample 1 (Shandong branch of Aluminum Corporation of China, Bayer process red mud), crush, grind, and sieve according to 50-120 mesh, and deionized water at a liquid-solid ratio of 10ml g -1 Mix and stir evenly under the condition of heating in a constant temperature water bath at 80°C to obtain a red mud suspension. At this time, the pH of the suspension is alkaline; the preparation concentration is 0.1mol L -1 dilute hydrochloric acid and slowly drop into the suspension and continue to stir until the pH of the suspension is about 7.0 to acid-activate the red mud; the resulting mixed solution is suction-filtered and further washed to remove impurity ions to obtain a neutral The quality of the filter cake is recorded as M; the obtained neutral filter cake is mixed with a certain quality granulating agent (kaolin, Al 2 o 3 ·SiO2 2 ·H 2 O, chemically pure; soluble starch; graphite powder) were mixed according to a fixed ratio (kaolin doping qua...

Embodiment 2

[0053] The steps are as in Example 1, changing the concentration of hydrochloric acid solution for pickling to 0.2mol L -1 , to obtain catalyst B.

[0054] The XRD patterns of the acidified red mud sample and the original red mud sample are as follows: figure 1 As shown, α-Fe 2 o 3 The diffraction peaks are enhanced after the acidification treatment, indicating that the acidification process involved in the present invention is conducive to the formation of uniform and stable α-Fe in the red mud sample 2 o 3 Phase structure, as the main phase that provides SCR denitrification activity, the formation of its stable phase is beneficial to the denitrification reaction.

[0055] The effect of pickling on red mud samples is shown in Table 1.

[0056] Table 1 Effect of washing / pickling / calcination after pickling on activated red mud

[0057]

Embodiment 3

[0059] The steps are as in Example 1, changing the concentration of hydrochloric acid solution for pickling to 0.25mol L -1 , to obtain catalyst C.

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Abstract

The invention discloses a denitration catalyst material, and a preparation method and application thereof. The catalyst uses industrial waste gas red mud as precursors; a series of pretreatment is performed to obtain a composite oxide denitration catalyst taking iron and aluminum as main active ingredients. The method comprises the following steps of preparing a red mud suspension; regulating the pH value of the red mud suspension to 6.5 to 7.5 by dilute hydrochloric acid; performing acid activation on the red mud. The prepared catalyst material uses iron base industrial waste red mud, so that the manufacturing cost of the catalyst is greatly reduced. A simple process measure is used; the preparation of the denitration catalyst is realized; meanwhile, a novel method of red mud resource utilization is provided. The prepared catalyst cannot be easily lost; the service life is long; pollution cannot be caused on the environment; the serious environment problem of secondary pollution and the like due to heavy metal vanadium loss in the application of a conventional vanadium series catalyst is solved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and catalysis, and specifically relates to a denitrification catalyst material and its preparation method and application, in particular to a nitrogen oxidation method using iron-based industrial waste as an active component and applied to fixed sources such as coal-fired thermal power plants. Fe-based composite oxide catalysts removed by selective catalytic reduction. [0002] technical background [0003] Nitrogen oxide is an extremely harmful air pollutant that can cause damage to the ecological environment and endanger life. In 2015, the last year of the country's "Twelfth Five-Year Plan", strict annual emission reduction tasks were determined: compared with 2014, the national NO x The total emission is reduced by 5%; at the same time, the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011) clearly requires that coal-fired units NO x Emission limit 1...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/10B01J31/28B01J35/04B01J35/02B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/745B01J31/28B01D2258/0283B01J35/00B01J35/30B01J35/56B01J35/613B01J35/651B01J35/633Y02A50/20
Inventor 王栋牛胜利韩奎华吴惊坤路春美徐丽婷张亢李英杰赵建立李婧
Owner SHANDONG UNIV
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