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In-situ catalyst for preparing sulfur by reducing high-concentration sulfur dioxide and preparation method of in-situ catalyst

An in-situ catalyst and sulfur dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of easy oxidation and deactivation of sulfur dioxide raw materials and poor process control and other problems, to achieve good hydrothermal stability, improve hydrothermal stability, and increase the effect of content

Active Publication Date: 2020-02-11
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide an in-situ catalyst for sulfur dioxide reduction with high concentration and its preparation method, which solves the problem that existing sulfur dioxide reduction catalysts are not only difficult to control in technology, but also easy to oxidize and lose high-concentration sulfur dioxide raw materials. live question

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  • In-situ catalyst for preparing sulfur by reducing high-concentration sulfur dioxide and preparation method of in-situ catalyst
  • In-situ catalyst for preparing sulfur by reducing high-concentration sulfur dioxide and preparation method of in-situ catalyst

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preparation example Construction

[0026] The preparation method of an in-situ catalyst for producing sulfur by reducing sulfur dioxide with high concentration provided by the invention comprises the following steps:

[0027] Step 1, configure the mixed solution

[0028] (1.0-3.0)mol / L Co(NO 3 ) 2 ·6H 2 O, (1-3) mol / L Al(NO 3 ) 3 9H 2 O, (1.0-8.0) mol / L CO(NH 2 ) 2 , (0.02-0.2) mol / L of Fe(NO 3 ) 3 9H 2 O, (0.1-0.7) mol / L of Mg(NO3 ) 2 ·6H 2 O and (0.01-0.0)6mol / L La(NO 3 ) 3 ·nH 2 O is mixed to obtain a mixed solution;

[0029] Step 2. Transfer the mixed solution configured above to a rotary evaporator, slowly increase the temperature of the oil bath to 80-110°C under constant rotation, add 0.10mol / L ammonia water drop by drop and maintain the pH value of the mother liquor at 7.5 Between -9.0, a precipitation reaction is carried out; after the precipitation reaction, the evaporator is raised to evacuate the oil bath, and the mother liquor is continuously rotated and cooled at room temperature f...

Embodiment 1

[0032] Weigh 135g of Co(NO 3 ) 2 ·6H 2 O, 300g of Al(NO 3 ) 3 9H 2 O, 15g of Fe(NO 3 ) 3 9H 2 O, 32g of Mg(NO 3 ) 2 ·6H 2 O, 1.5g of La(NO 3 ) 3 ·nH 2 O and 180g of CO(NH 2 ) 2 , the mixed solution; transfer the mixed solution to a rotary evaporator, slowly increase the temperature of the oil bath to 90°C under constant rotation, add 0.10mol / L ammonia water drop by drop and maintain the mother liquor pH value between 8.0, Carry out the precipitation reaction for 3 hours; after the precipitation reaction, raise the evaporator to evacuate the oil bath, continue to rotate and cool the mother liquor at room temperature for 2 hours, then filter and wash the precipitate to obtain the precipitate; microwave the precipitate at 90°C for 2 hours, then cool to At room temperature, the cobalt-aluminum hydrotalcite catalyst precursor is obtained for subsequent use;

[0033] Weigh 140g of the cobalt-aluminum hydrotalcite catalyst precursor prepared above and add it to a 500m...

Embodiment 2

[0035] Weigh 150g of Co(NO 3 ) 2 ·6H 2 O, 320g of Al(NO 3 ) 3 9H 2 O, 18g of Fe(NO 3 ) 3 9H 2 O, 35g of Mg(NO 3 ) 2 ·6H 2 O, 3.5g of La(NO 3 ) 3 ·nH 2 O and 190g of CO(NH 2 ) 2 , the mixed solution; transfer the mixed solution to a rotary evaporator, slowly increase the temperature of the oil bath to 100°C under constant rotation, add 0.10mol / L ammonia water drop by drop and maintain the pH value of the mother solution between 8.0, Carry out precipitation reaction; after the precipitation reaction, raise the evaporator to evacuate the oil bath, continue to rotate and cool the mother liquor at room temperature for 2 hours, then filter and wash the precipitate to obtain the precipitate; microwave the precipitate at 0°C for 0.5 hour, and cool to At room temperature, the cobalt-aluminum hydrotalcite catalyst precursor is obtained for subsequent use;

[0036] Weigh and add 160g of the cobalt-aluminum hydrotalcite catalyst precursor prepared above into a 500ml beaker...

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Abstract

The invention provides an in-situ catalyst for preparing sulfur by reducing high-concentration sulfur dioxide and a preparation method of the in-situ catalyst. The in-situ catalyst comprises the following components: 10% to 40% of CoO, 30% to 60% of Al2O3, 2% to 10% of MgO, 5% to 10% of Fe2O3, 0.5% to 5% of La2O3 and 2% to 10% of MoO3. The catalyst prepared by the method can increase the content of hydrogen in a mixed atmosphere and reduce water generated by a reduction reaction, and is improved in hydrothermal stability.

Description

technical field [0001] The invention belongs to the technical field of preparing sulfur by reducing sulfur dioxide, and in particular relates to an in-situ catalyst for preparing sulfur by reducing high-concentration sulfur dioxide and a preparation method thereof. Background technique [0002] The sources of sulfur dioxide emissions in my country are mainly produced by coal combustion, iron and steel smelting, non-ferrous and precious metal smelting, petrochemical and other production processes; among them, the high concentration (φSO 2 >3%) of SO 2 Mainly used to prepare sulfuric acid, low concentration (φSO 2 <1%)SO 2 Sulphate is mainly generated by neutralization of alkali metals or alkaline earth metals; due to restrictions on geographical location, transportation, production, storage and transportation, etc., the sulfuric acid production process from sulfur dioxide is not suitable for remote smelters, but it can improve the quality of enterprise products by mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C01B17/04
CPCB01J23/002B01J23/8872B01J2523/00C01B17/0486C01B17/0491B01J2523/22B01J2523/31B01J2523/3706B01J2523/68B01J2523/842B01J2523/845
Inventor 王晓龙何忠王琪刘蓉郜时旺
Owner CHINA HUANENG GRP CO LTD