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Iron-niobium oxide as well as preparation method and application thereof

A technology of oxide and iron niobium, which is applied in the field of iron niobium oxide and its preparation, can solve the problems of poor catalytic effect and low space velocity of catalysts, and achieve the effect of improving catalytic performance and good catalytic performance

Active Publication Date: 2020-11-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its space velocity is low and the catalytic effect of the catalyst is poor.

Method used

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  • Iron-niobium oxide as well as preparation method and application thereof
  • Iron-niobium oxide as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0061] This embodiment provides a method for preparing iron niobium oxide, which specifically includes:

[0062] (I) take ferric nitrate nonahydrate and niobium oxalate by mass ratio 2:1; Configuration concentration is the CTAB aqueous solution of 30mmol / L, wherein, the mass ratio of CTAB in ferric nitrate nonahydrate and CTAB aqueous solution is 3.7:1, will weigh Add ferric nitrate nonahydrate and niobium oxalate into CTAB aqueous solution and mix and stir at 20°C for 1 hour to obtain a mixture. Add 25 wt% ammonia solution to the mixture to make the pH of the reaction system 11, stir and mix at 20°C for 3 hours to obtain a mixed solution ;

[0063] (II) The mixed solution is heated in a water bath at 90°C for 10 hours. After heating, suction filtration and washing are carried out to obtain a solid product. The solid product is dried at 100°C. After drying, it is calcined at 400°C for 5 hours. The rate is 2°C / min, and iron niobium oxide is obtained.

[0064] Adopt above-ment...

Embodiment 2

[0067] This embodiment provides a method for preparing iron niobium oxide, which specifically includes:

[0068] (I) take ferric nitrate nonahydrate and niobium oxalate by mass ratio 2:1; Configuration concentration is the CTAB aqueous solution of 5mmol / L, wherein, the mass ratio of CTAB in ferric nitrate nonahydrate and CTAB aqueous solution is 3.7:1, will weigh Add ferric nitrate nonahydrate and niobium oxalate into CTAB aqueous solution and mix and stir at 22°C for 0.5h to obtain a mixture, add 26wt% ammonia solution to the mixture to make the pH of the reaction system 11, stir and mix at 22°C for 1h to obtain a mixed solution ;

[0069] (II) The mixed solution is heated in a water bath at 60°C for 15 hours, and then filtered and washed with suction to obtain a solid product. The solid product is dried at 100°C, and after drying, it is calcined at 500°C for 5 hours. The rate is 1°C / min, and iron niobium oxide is obtained.

[0070] Adopt above-mentioned preparation method ...

Embodiment 3

[0073] This embodiment provides a method for preparing iron niobium oxide, which specifically includes:

[0074] (I) take ferric nitrate nonahydrate and niobium oxalate by mass ratio 2:1; Configuration concentration is the CTAB aqueous solution of 50mmol / L, wherein, the CTAB mass ratio in ferric nitrate nonahydrate and CTAB aqueous solution is 3.7:1, will weigh Add ferric nitrate nonahydrate and niobium oxalate into CTAB aqueous solution and mix and stir at 30°C for 3 hours to obtain a mixture, add 22wt% ammonia solution to the mixture to make the pH of the reaction system 11, stir and mix at 30°C for 5 hours to obtain a mixed solution;

[0075] (II) The mixed solution is heated in a water bath at 95°C for 5 hours, and then filtered and washed with suction to obtain a solid product. The solid product is dried at 120°C, and after drying, it is calcined at 400°C for 3 hours. The rate is 10°C / min to obtain iron niobium oxide.

[0076] Adopt above-mentioned preparation method to ...

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Abstract

The invention provides an iron-niobium oxide as well as a preparation method and application thereof. The Fe2O3 crystal forms in the iron-niobium oxide are all gamma-Fe2O3. The preparation method comprises the following steps: (1) mixing an iron precursor, a niobium precursor, a CTAB solution and an alkaline solution to obtain a mixed solution; and (II) heating the mixed solution to obtain a solidproduct, and roasting the obtained solid product to obtain the iron-niobium oxide. The iron-niobium oxide can be used as a catalyst for ammonia selective catalytic reduction of nitrogen oxide. By adding CTAB, gamma-Fe2O3 can be inhibited from being converted into alpha-Fe2O3 at high temperature, the catalytic performance of the catalyst can be effectively improved, the conversion rate of nitric oxide can reach 93% or above, the preparation process of the iron-niobium oxide catalyst is simple, and industrial production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to an iron niobium oxide, its preparation method and application. Background technique [0002] Nitrogen oxides mainly come from coal-burning smoke and vehicle exhaust, which can cause major environmental problems such as acid rain, photochemical smog, ozone layer destruction, and greenhouse effect, and have a serious impact on human health and the ecological environment. Therefore, the emission reduction of nitrogen oxides is included in the total pollutant control index. Currently, NO x There are many removal methods, including low NO x Combustion technology, reburning and advanced reburning technology, selective non-catalytic reduction technology (SNCR) and selective catalytic reduction technology (SCR), among which selective catalytic reduction (SCR) ammonia selective catalytic reduction technology is the most widely studied and applied . [0003] CN104069861A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01D53/86B01D53/56
CPCB01J23/002B01J23/8474B01D53/8628B01D2251/2062Y02E60/10
Inventor 贺泓张文硕余运波石晓燕
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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