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Preparation of Ni-pillared manganese-based montmorillonite (Ni/Mn-MMT) low-temperature denitration catalyst

A low-temperature denitrification and montmorillonite technology, applied in the field of flue gas denitrification, can solve the problems of widening interlayer spacing, poor stability, small specific surface area, etc., and achieve the effects of low-temperature denitrification rate improvement, good low-temperature activity, and strong adsorption

Inactive Publication Date: 2019-07-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at many disadvantages of the existing denitrification catalyst carrier layer spacing, small specific surface area, poor stability, etc., and adopts inorganic cations Ni and Mn as cross-linking agents to support such materials to support the layers of layered clay, so that the layer spacing widens, eventually forming a porous network of two-dimensional channels

Method used

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  • Preparation of Ni-pillared manganese-based montmorillonite (Ni/Mn-MMT) low-temperature denitration catalyst
  • Preparation of Ni-pillared manganese-based montmorillonite (Ni/Mn-MMT) low-temperature denitration catalyst

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Effect test

Embodiment 1

[0020] (1) Take 20 g of purified montmorillonite, swell it with 1000 mL of deionized water for 6 h, and then take Ni(CH 3 COO) 2 4H 2 O solid, dissolved with appropriate amount of distilled water and added to montmorillonite with sufficient swelling, heated and stirred at 180 °C for 6 h, after the stirring was completed, move the suspension into a high-pressure reactor, and react at 180 °C for 5 h Then take it out and wash it by centrifugation for 3-4 times. After drying in an oven at 100 °C, it was baked in a muffle furnace at 500 °C for 4 hours to obtain nickel-based pillared montmorillonite (5%Ni-MMT). Ni / Mn-MMT catalysts were prepared by isometric impregnation method. Weigh 15 g of montmorillonite carrier, manganese load 15% (mass fraction), the required mass of MnSO 4 · H 2 O and the same molar ratio of (NH 4 ) 2 S 2 o 8 Dissolve in appropriate amount of distilled water. The prepared solution was added to the nickel-based pillared montmorillonite, heated and sti...

Embodiment 2

[0022] Ni(CH 3 COO) 2 4H 2 O solid, all the other steps are with embodiment 1, promptly obtain 10%Ni / Mn-MMT catalyst.

Embodiment 3

[0024] Ni(CH 3 COO) 2 4H 2 O solid, all the other steps are with embodiment 1, promptly obtain 15%Ni / Mn-MMT catalyst.

[0025] figure 1 It is the XRD figure of the Ni / Mn-MMT catalyst prepared in embodiment 1. It can be seen from the figure that in 2 θ The peak at 19.9º belongs to the (100) crystal plane, which is a characteristic peak of montmorillonite. None of the peaks changed after impregnation with the impregnation solution, indicating that the loaded active ingredient did not affect the structure of the carrier. at 2 θ =37.2°, 43.2°, 62.8° NiO diffraction peaks were detected, corresponding to (111), (200), (220) crystal planes of NiO, and at the same time at 2 θ =19.86°, 22.82°, 35.04°, 42.42°, 5.84°, 62.36° observed MnO 2 The peaks correspond to (100), (110), (040), (140), (240), (151) crystal planes, indicating that Ni and Mn are well pillared between the montmorillonite.

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Abstract

The invention belongs to the field of flue gas denitration, and particularly relates to preparation and application of a Ni-pillared manganese-based montmorillonite (Ni / Mn-MMT) low-temperature denitration catalyst. According to the preparation, the montmorillonite (MMT) is taken as a raw materials, the Ni / MN-MMT low temperature denitration catalyst is prepared by a dipping method, and the denitration performance of the Ni / MN-MMT low temperature denitration catalyst at a low temperature is studied and evaluated. In the experiment, the characteristics of the montmorillonite are utilized, and Niand Mn pillared montmorillonite is used to enlarge the interlayer spacing of the montmorillonite, so that the montmorillonite has a better carrier effect; and meanwhile, the composite catalyst has good performance on denitration, and has good denitration reduction effect at a lower temperature. The preparation process is simple, economical and practical, and does not need any template, moreover, the specific surface area of the catalyst is effectively increased, the denitration activity is improved and the stability is better.

Description

technical field [0001] The invention belongs to the field of flue gas denitration, in particular to a Ni-pillared manganese-based montmorillonite (Ni / Mn-MMT) low-temperature denitration catalyst. Background technique [0002] Today's environmental problems in our country are inversely proportional to the rapid economic development. The burning of a large amount of energy in industrial production has caused the concentration of nitrogen oxides in the atmosphere to exceed the standard, resulting in acid rain and photochemical pollution, affecting human health and destroying the environment. If things go on like this, it will seriously restrict the sustainable development of our country's economy and society. In my country, according to incomplete statistics, NO x The amount of emissions has reached 67% of the total amount of harmful gas emissions. Ammonia Selective Catalytic Reduction (SCR) technology is currently a relatively effective method for controlling nitrogen oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01J37/02B01D53/86B01D53/56
CPCB01J23/8892B01J37/0201B01D53/8628B01D2258/0283B01J35/60
Inventor 谢爱娟朱仕超陶宇炜罗士平熊志宸余祥浪袁波刘忠翔王飞
Owner CHANGZHOU UNIV
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