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Preparation method of high-load Ru-MnOX/graphene denitration catalyst

A denitration catalyst and graphene technology, applied in the field of denitration catalysts, can solve the problems of low Ru loading, low low temperature catalytic activity, agglomeration, etc., and achieve high NOx conversion rate and selectivity, good denitration effect, and water and sulfur resistance. strong effect

Active Publication Date: 2020-08-25
湖南立泰环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The above-mentioned patents all mention the use of precious metal Ru and MnO2 as active components, but there is a serious problem, that is, the low-temperature catalytic activity is low, and the main reason is that the loading of Ru is too low. As we all know, Ru, as a noble metal catalyst, Like Rh, it usually endows the catalyst with extremely high low-temperature catalytic activity, but as a noble metal catalyst, Ru generally has a loading amount of 0.1wt.%-5wt.% during the loading process. When the loading amount is greater than 5wt.%, it will occur Severe agglomeration phenomenon, particle size greater than 150nm if attached Figure 7 As shown, there are few technical solutions to increase the loading of Ru to more than 10wt.% and maintain a highly dispersed state of Ru

Method used

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  • Preparation method of high-load Ru-MnOX/graphene denitration catalyst
  • Preparation method of high-load Ru-MnOX/graphene denitration catalyst
  • Preparation method of high-load Ru-MnOX/graphene denitration catalyst

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Effect test

Embodiment 1

[0040] A kind of preparation method of highly loaded Ru-MnOX / graphene denitration catalyst comprises the steps:

[0041] (1) Pretreatment of graphene: put 2g of graphene in a 100 mL flask, add 98wt.% H2SO4 and 65-67wt.% HNO3, the volume ratio of H2SO4 and HNO3 is 2:1, filter and wash until the filtrate When pH=6.0, stop washing

[0042] , ultrasonically oscillating for 20 min, then reflux at 130 oC for 3 h under stirring and heating in an oil bath, filter and wash with deionized water, and air-dry the filtrate at 60 oC for 12 h to obtain a graphene substrate treated with mixed acid oxidation .

[0043] (2) Hydrothermal preparation of MnOX / graphene material: place the graphene substrate prepared in step (1) in 0.2M Mn(NO3)2.6H2O aqueous solution, add 0.5g urotropine dropwise, and stir for 3min After that, put it in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 95oC for 9h, cool naturally, wash with deionized water, filter, air dry, and roast. To 300oC, c...

Embodiment 2

[0046] A kind of preparation method of highly loaded Ru-MnOX / graphene denitration catalyst comprises the steps:

[0047] (1) Pretreatment of graphene: put 2.5g graphene in a 100 mL flask, add 98wt.% H2SO4 and 65-67wt.% HNO3, the volume ratio of H2SO4 and HNO3 is 2.5:1, filter and wash to filter When the solution pH=6.25, stop washing

[0048] , ultrasonically oscillating for 25 min, then reflux at 135 oC for 3.5 h under stirring and heating in an oil bath, filtered and washed with deionized water, and air-dried at 75 oC for 18 h to obtain graphene treated with mixed acid oxidation Substrate.

[0049] (2) Hydrothermal preparation of MnOX / graphene material: place the graphene substrate prepared in step (1) in 0.25M Mn(NO3)2.6H2O aqueous solution, add 0.75g urotropine dropwise, and stir for 4min Afterwards, put it in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 97.5oC for 9.5h, cool naturally, wash with deionized water, filter, air dry, and roast. / min ra...

Embodiment 3

[0052] A kind of preparation method of highly loaded Ru-MnOX / graphene denitration catalyst comprises the steps:

[0053] (1) Pretreatment graphene: put 3g graphene in a 100 mL flask, add 98wt.% H2SO4 and 65-67wt.% HNO3, the volume ratio of H2SO4 and HNO3 is 3:1, filter and wash until the filtrate When pH=6.5, stop washing, ultrasonically oscillate for 30 min, then reflux at 140 oC for 4 h under the condition of stirring and heating in an oil bath, filter and wash with deionized water, and air-dry the filtrate at 80 oC for 24 h to obtain Mixed acid oxidation treated graphene substrate.

[0054] (2) Hydrothermal preparation of MnOX / graphene material: place the graphene substrate prepared in step (1) in 0.5M Mn(NO3)2.6H2O aqueous solution, add 1 g of urotropine dropwise, and stir for 5 minutes Place in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 100oC for 10h, cool naturally, wash with deionized water, filter, air dry, and roast. 330oC, constant temperatu...

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Abstract

The invention provides a preparation method of a high-load Ru-MnOX / graphene denitration catalyst. The catalyst is in a sheet flower shape, Ru metal is highly dispersed in MnOX / graphene, the loading capacity of Ru is 10-15 wt.%, the Ru metal is highly dispersed on the surface of the catalyst, the agglomeration phenomenon is avoided, the particle size is 1-2 nm, and the catalyst has extremely high conversion rate and selectivity and good SO2 / water resistance stability.

Description

technical field [0001] The invention relates to a preparation method of a highly loaded Ru-MnOX / graphene denitration catalyst, belonging to the field of denitration catalysts. [0002] technical background [0003] Nitrogen oxide NOX refers to a compound composed of only two elements, nitrogen and oxygen. There are many types of nitrogen oxides, including nitrous oxide N2O, nitrogen monoxide NO, nitrogen dioxide NO2, dinitrogen trioxide N2O3, dinitrogen tetroxide Nitrogen N2O4 and dinitrogen pentoxide N2O5 and other compounds. Except for nitrogen dioxide, other NOx are extremely unstable. When exposed to light, humidity or heat, they will become nitrogen dioxide and nitric oxide, and nitric oxide will change into into nitrogen dioxide. The main causes of air pollution are nitric oxide (NO) and nitrogen dioxide (NO2). The sources of NO2 pollutants in the atmosphere are mainly divided into two aspects: one is natural sources, and the other is anthropogenic sources. The man-m...

Claims

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Application Information

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IPC IPC(8): B01J37/10B01J37/12B01J23/656B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/6562B01J37/10B01J37/12B01J35/23B01J35/647B01J35/657Y02C20/10
Inventor 赵玉平
Owner 湖南立泰环境工程有限公司