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Modifying method of vanadium catalyst for preparing sulfuric acid through sulfur dioxide

A sulfur dioxide and catalyst technology, which is applied in the field of catalyst modification, can solve problems such as low conversion rate, damage to human health, and large grain size of crystal phase components, so as to increase the percentage content, reduce production burden, and reduce grain size. small size effect

Active Publication Date: 2019-07-26
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with imported vanadium catalysts, domestic vanadium catalysts have problems such as low conversion rate, high light-off temperature, poor thermal stability and short life. The reasons are: the content of pentavalent vanadium and surface chemically adsorbed oxygen in domestic catalysts is low , the grain size of the crystal phase component is larger, the melting temperature of the active molten salt is higher, the pore volume is smaller, and the pore size distribution range is narrower
[0003] The predecessors solved the problem of high melting temperature of the active molten salt by adding cesium salt to the catalyst. Although good results were achieved, the cesium salt was expensive and increased the production cost of the enterprise; some domestic researchers used the water quenching method to obtain five The sol of vanadium oxide is loaded on diatomite by impregnation method to prepare nano-vanadium catalyst
Although the grain size of the active component becomes smaller, this method needs to melt vanadium pentoxide under high temperature conditions during the preparation of the sol, which causes a large amount of toxic gaseous vanadium pentoxide to volatilize into the air, which is harmful to human health and is not Good for large scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: a kind of modified method of the vanadium catalyst that sulfur dioxide is used for sulfuric acid production, the steps are as follows:

[0033] a, 1 mass part of Pr(NO 3 ) 3 Dissolved in deionized water, then mixed evenly with 20 parts by mass of diatomite, impregnated, filtered, dried at 80°C for 2h, and then heated to 600°C at 5°C / min for 5h to obtain a Pr-doped diatomite carrier ;

[0034] b. Weigh 2 parts by mass of V 2 o 5 Added to H with a mass fraction of 10% 2 o 2 In the solution, stir to dissolve it completely, then transfer it to a water-heated tank, seal it, and keep it warm at 180°C for 24 hours. After the reaction is completed, cool it down to room temperature naturally, then centrifuge, wash, filter, and dry at 80°C for 2 hours to obtain Nano V 2 o 5 ;

[0035] c, the K of 6 mass parts 2 SO 4 and 1.3 parts by mass of anhydrous Na 2 SO 4 Dissolve in deionized water, then add the nano V prepared in step b 2 o 5 and dispersing it ...

Embodiment 2

[0037] Embodiment 2: a kind of modification method of the vanadium catalyst that sulfur dioxide is used for sulfuric acid production, the steps are as follows:

[0038] a, 0.5 parts by mass of Pr(NO 3 ) 3 Dissolved in deionized water, then mixed evenly with 20 parts by mass of diatomaceous earth, impregnated, filtered, dried at 70°C for 1 hour, and then heated to 550°C at 4°C / min for 4 hours to obtain a Pr-doped diatomite carrier ;

[0039] b. Weigh 1 mass part of V2 o 5 Added to H with a mass fraction of 10% 2 o 2 In the solution, stir to dissolve it completely, then transfer it to a water-heated tank, seal it, and keep it warm at 150°C for 20 hours, cool it down to room temperature naturally after the reaction, then centrifuge, wash, filter, and dry at 70°C for 1 hour to obtain Nano V 2 o 5 ;

[0040] c, the K of 6 mass parts 2 SO 4 and 1 mass part of anhydrous Na 2 SO 4 Dissolve in deionized water, then add the nano V prepared in step b 2 o 5 and dispersing it...

Embodiment 3

[0042] Embodiment 3: a kind of modification method of the vanadium catalyst that sulfur dioxide is used for sulfuric acid production, the steps are as follows:

[0043] a, 1.5 parts by mass of Pr(NO 3 ) 3 Dissolved in deionized water, then mixed evenly with 20 parts by mass of diatomaceous earth, impregnated, filtered, dried at 90°C for 1-3h, and then heated at 6°C / min to 650°C for 6h to obtain Pr-doped diatoms soil carrier;

[0044] b. Weigh 3 parts by mass of V 2 o 5 Added to H with a mass fraction of 10% 2 o 2 In the solution, stir to dissolve it completely, then transfer it to a water-heated tank, seal it, and keep it warm at 210°C for 30 hours, cool it down to room temperature naturally after the reaction, then centrifuge, wash, filter, and dry at 90°C for 3 hours to obtain Nano V 2 o 5 ;

[0045] c, the K of 6 mass parts 2 SO 4 and 1.5 parts by mass of anhydrous Na 2 SO 4 Dissolve in deionized water, then add the nano V prepared in step b 2 o 5 and dispers...

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Abstract

The invention discloses a modifying method of a vanadium catalyst for preparing sulfuric acid through sulfur dioxide. The method includes: combining Pr doping with a hydrothermal process to modify thevanadium catalyst. The method has the advantages that the method is low in modifying cost, nontoxic and harmless in modifying process and conducive to large-scale production, and the vanadium catalyst after being modified is high in catalytic activity.

Description

technical field [0001] The invention relates to a method for modifying a catalyst used for preparing sulfuric acid from sulfur dioxide, in particular to a method for modifying a vanadium catalyst used for preparing sulfuric acid from sulfur dioxide. Background technique [0002] With the enhancement of national awareness of environmental protection, the reduction of tail gas SO in the production of sulfuric acid 2 The emission of the vanadium has become the focus of attention and the focus of research, and the main means to solve this problem is to improve the performance of the vanadium catalyst. However, compared with imported vanadium catalysts, domestic vanadium catalysts have problems such as low conversion rate, high light-off temperature, poor thermal stability and short life. The reasons are: the content of pentavalent vanadium and surface chemically adsorbed oxygen in domestic catalysts is low , the grain size of the crystalline phase component is larger, the melti...

Claims

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Application Information

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IPC IPC(8): B01J23/22C01B17/79
CPCB01J23/22C01B17/79
Inventor 林倩潘红艳曹建新范鑫胡菲菲
Owner GUIZHOU UNIV
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