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A catalyst for co catalytic reduction of so 2 The preparation of the composite catalyst and the method for recovering sulfur

A composite catalyst and SO2 technology, which is applied in the field of air pollution purification, can solve the problems of uneven distribution of catalyst active components, adverse effects of catalysts, complex preparation process, etc., and achieve excellent low-temperature activity, improved ability, and simple preparation process.

Active Publication Date: 2019-12-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are two major problems in the direct catalytic reduction method: first, the reaction temperature is 50-250°C higher than that of the sintering flue gas, and an excessively high reaction temperature requires more energy consumption, which will have certain difficulties for industrial applications
Second, most of the sintering flue gas contains a certain amount of oxygen (about 3%~5%), the presence of oxygen may have adverse effects on the catalyst, and even deactivate the catalyst
Although the supported catalyst can obtain higher SO at lower temperature 2 conversion rate, but its preparation process is complex, and the prepared catalyst active components are unevenly distributed on the carrier, easy to sinter and peel off, and there are certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Catalytic reduction of SO for CO2 The preparation of the composite catalyst and the method for reclaiming sulfur, concrete operations are as follows:

[0024] Take by weighing lanthanum nitrate, cerium nitrate and cobalt nitrate solid, add deionized water respectively, respectively mix and be made into the solution of 0.5mol / L, then take respectively the lanthanum nitrate solution of 20mL and the cobalt nitrate solution of 20mL in molar ratio as La: Ce:Co=1:0:1 prepare a mixed solution, put the mixed solution in a constant temperature water bath at 80°C and stir evenly, and add 80mL of 0.5mol / L citric acid solution dropwise to the mixed solution for complexation, and the above complex The complex solution was ultrasonically treated for 2 hours, the power was controlled at 100W, and the frequency was 40kHz, and then the complex solution was dried in a 60°C oven. After drying, the dried product was placed in a microwave tube furnace protected by a nitrogen atmos...

Embodiment 2

[0025] Example 2: Catalytic reduction of SO for CO 2 The preparation of the composite catalyst and the method for reclaiming sulfur, concrete operations are as follows:

[0026] Weigh the solids of lanthanum nitrate, cerium nitrate and cobalt nitrate, add deionized water respectively, mix well and form 0.5mol / L solutions, then take 18mL lanthanum nitrate solution, 2mL cerium nitrate and 20mL cobalt nitrate solution respectively, Prepare mixed solution for La:Ce:Co=9:1:10, and add ferric nitrate solid in mixed solution, the quality of ferric nitrate solid is 3% of the obtained composite catalyst quality, wherein according to the lanthanum oxide obtained after roasting , the relative molecular mass of cerium oxide and cobalt oxide, multiplied by the molar number of lanthanum nitrate, cerium nitrate and cobalt nitrate used, the quality obtained is the quality of the composite catalyst prepared, the mixed solution is placed in a 75 ℃ constant temperature water bath Stir evenly un...

Embodiment 3

[0027] Example 3: Catalytic reduction of SO for CO 2 The preparation of the composite catalyst and the method for reclaiming sulfur, concrete operations are as follows:

[0028] Weigh lanthanum nitrate, cerium nitrate and cobalt nitrate solids, add deionized water respectively, mix well and form 0.5mol / L solutions, then take 14mL lanthanum nitrate solution, 6mL cerium nitrate solution and 20mL cobalt nitrate solution in molar ratio For La:Ce:Co=7:3:10 preparation mixed solution, and in mixed solution, add praseodymium nitrate solid, the weight of praseodymium nitrate solid is 4% of the composite catalyst weight that makes, wherein according to the lanthanum oxide obtained after roasting , the relative molecular mass of cerium oxide and cobalt oxide, multiplied by the molar number of lanthanum nitrate, cerium nitrate and cobalt nitrate used, the quality obtained is the quality of the composite catalyst prepared, the mixed solution is placed in 80 ℃ constant temperature water ba...

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PUM

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Abstract

The invention discloses a method for preparing a composite catalyst for catalytic reduction of SO2 by CO and recovering sulfur, and belongs to the technical field of air pollution purification. The mesoporous La-Co-Ce-O composite catalyst is prepared with a microwave-assisted in-situ carbon template stabilization method, and catalytic reduction of SO2 by CO in flue gas and sulfur recovery are realized by using the composite catalyst. The prepared composite catalyst has the advantages of low activation temperature and higher activity stability; the preparation process is simple and implementable, the cost is saved, the purposes of purification of CO and SO2 and sulfur recovery are achieved at the same time, waste is changed into valuables, secondary pollution, waste water and waste liquid are avoided, and the method has broader application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution purification, in particular to a method for CO catalytic reduction of SO 2 The preparation of the composite catalyst and the method for recovering sulfur. Background technique [0002] SO 2 It is one of the main air pollutants, which is likely to cause large-scale regional acid rain pollution. SO produced during the sintering process 2 About SO 2 45%~60% of the total emissions. Therefore, to control the sintering production process SO 2 The emission is the focus of pollution control in iron and steel enterprises. For such a huge SO 2 Pollution sources, we must seek appropriate solutions from economic and technical perspectives to reduce SO 2 total emissions. [0003] Currently, for sintering flue gas SO 2 Emission control methods include low-sulfur raw materials or flue gas desulfurization. Flue gas desulfurization is the ultimate and most effective SO 2 Emission reduction techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043B01J37/34B01J37/08B01J37/20B01D53/90B01D53/50C01B17/04
CPCB01D53/8609B01D53/90B01J23/002B01J27/043B01J37/0018B01J37/086B01J37/20B01J37/346B01J2523/00C01B17/0434B01J2523/3706B01J2523/3712B01J2523/842B01J2523/845B01J2523/3718B01J2523/36Y02P20/584
Inventor 张秋林胡嘉宁平刘启宪樊洁王兰英刘昕
Owner KUNMING UNIV OF SCI & TECH