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Activating and regenerating method for preparing sulfur catalyst from SO2

A catalyst, SO2 technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of inconvenient transportation and storage of sources, large consumption of natural gas and oxygen, and difficulty in industrialization, etc. problem, to achieve the effect of solving the effect of large heat release, serious loss of active components, high regenerative activity, and cost control

Inactive Publication Date: 2017-09-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other methods are also difficult to realize industrialization due to various reasons
There are hydrogen reduction method and high-temperature methane reduction method that have been industrialized, but H 2 The transportation and storage of the source are not very convenient, and the operability is poor, and the consumption of natural gas and oxygen in the high-temperature methane reduction process is huge

Method used

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  • Activating and regenerating method for preparing sulfur catalyst from SO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For inactivated 14% Fe / γ-Al 2 o 3 SO 2 To prepare the catalyst for sulfur, after the device is shut down, at 200°C, air is introduced into the catalyst bed for 5 hours, and then the ratio of air and oxygen is changed, and at 300°C, a mixture of air / oxygen is 5 for 1 hour, 350 Air / oxygen mixture of 4 for 1 hour at ℃, air / oxygen mixture of 3 for 1 hour at 400℃, air / oxygen mixture of 2 for 1 hour at 450℃, 500℃ The mixed gas of air / oxygen is 1 for 0.5 hours, and the pure oxygen is passed for 0.5 hours under the condition of 600 °C; the catalyst after cooling down to room temperature and removing sulfur is removed by cyclone separator to remove debris impurities; the loss of Fe measured by elemental analysis is 1%, impregnated with ferric nitrate aqueous solution with 1% iron content for 6 hours, took it out and dried it, put it into the reactor, and calcined it at 550°C for 12h in a nitrogen atmosphere, then lowered the temperature to 400°C in a nitrogen atmosphere, and i...

Embodiment 2

[0023] For deactivated 6%Fe-10%Ni / γ-Al 2 o 3 SO 2 To prepare the catalyst for sulfur, after the device is shut down, air is introduced into the catalyst bed for 6 hours at a temperature of 250°C, and then the ratio of air and oxygen is changed, and a mixed gas of air / oxygen is 5 at 300°C for 1.5 hours, 400 1.5 hours of air / oxygen mixed gas of 3 at ℃, 0.5 hours of air / oxygen mixture of 1 at 500 ℃, 0.5 hours of pure oxygen at 600 ℃; the catalyst after cooling down to room temperature to remove sulfur Debris impurities were removed by a cyclone separator; the loss of Fe and Ni was measured to be 0.5% and 0.8% by elemental analysis, and it was impregnated with an aqueous solution containing 0.5% iron nitrate and nickel nitrate with a nickel content of 0.8% for 8 hours , put it into the reactor after being taken out and dried, and calcined at 500°C for 16h under a nitrogen atmosphere, then raised the temperature to 550°C under a nitrogen atmosphere, and in 10% H 2 S / H 2 Atmosph...

Embodiment 3

[0025] For inactivated 15% CO / γ-Al2 o 3 SO 2 For the preparation of sulfur catalyst, after the device is shut down, air is introduced into the catalyst bed for 8 hours at a temperature of 300°C, and then the ratio of air and oxygen is changed, and a mixed gas of air / oxygen is 5 for 1 hour at 350°C, 400 Air / oxygen mixture of 4 for 1 hour at ℃, air / oxygen mixture of 3 for 1 hour at 500℃, air / oxygen mixture of 1 for 0.5 hours at 550℃, 600℃ Pass pure oxygen for 1 hour; the catalyst after cooling down to room temperature to remove sulfur is removed by a cyclone separator to remove powder impurities; the loss of Co is almost 0% as measured by elemental analysis, and it is directly calcined in a reaction tube at 600°C for 12 hours under a nitrogen atmosphere. Cool down to 500°C under nitrogen atmosphere in 15% H 2 S / H 2 Vulcanize under the atmosphere for 3h, then drop to the reaction temperature for SO 2 Evaluation reactions for the preparation of sulfur.

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Abstract

The invention discloses an activating and regenerating method for preparing a sulfur catalyst from SO2. The method mainly comprises the following steps: firstly, removing sulfur solids accumulated on the surface of a catalyst; secondly, removing solid impurities which cannot be burnt off in the catalyst by a cyclone separator; thirdly, using a solution containing active metal components in the catalyst to impregnate or not impregnate the catalyst; fourthly, calcining the catalyst in the inert gas atmosphere; finally, vulcanizing the catalyst by using a sulfur-containing substance, thereby recovering the activity of a deactivated catalyst. The method has the characteristic that the regeneration activity of the catalyst is high; the problems of high heat release amount and serious loss of active components in the regeneration process of the catalyst are effectively solved; the loss of a carrier is effectively reduced, repeated use times of the catalyst are remarkably increased, and the cost is reduced; in addition, the operation process is simple, multiple steps can realize in-situ activation, and the cost of industrial large-batch catalysts is controlled.

Description

technical field [0001] The invention relates to a catalyst activation and regeneration method, in particular to a method for SO 2 Activation and regeneration methods for preparing sulfur catalysts. [0002] technical background [0003] China is the world's largest source of sulfur pollution. Sulfur dioxide emissions have continued to increase for many years. The sulfur dioxide emitted by thermal power plants accounts for half of the total. Half of the country's urban population breathes heavily polluted air, and the land in many places is eroded by acid rain. In recent years, the smog has been serious in most parts of northern my country, and the smog contains excessive sulfur compounds, which has caused great harm to human health. [0004] 90% of the country's sulfur dioxide is emitted by coal combustion, and the sulfur contained in boiler flue gas is the largest source of sulfur pollution. Although these enterprises have special equipment to remove most of the sulfur dio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/02B01J38/14B01J38/20B01J38/48B01J23/94B01J27/28
CPCB01J38/14B01J23/94B01J27/28B01J38/02B01J38/20B01J38/485
Inventor 李春山陈洪楠左村村葛亭亭张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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