Preparation and application of catalyst suitable for treating organic waste gas through low-temperature plasmas

A low-temperature plasma, organic waste gas technology, used in molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems such as low selectivity, to achieve the effect of improving energy utilization efficiency, improving treatment effect, and reducing secondary pollution

Inactive Publication Date: 2019-03-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the industries that emit VOCs are scattered, the concentration varies greatly, and they contain a large amount of particulate matter and complex components, it is difficult to achieve the treatment effect only by relying on a single technology, and plasma degradation technology is getting more and more attention
However, plasma alone degrades VOCs due to its low selectivity and the generation of some toxic by-products, which limits its practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The catalyst used in the following examples is prepared by the following method:

[0026] Prepare 1 mol / L manganese nitrate solution and 1 mol / L cerium nitrate solution. Take 150ml of manganese nitrate (0.15mol) solution and 250ml of cerium nitrate (0.25mol) solution and mix evenly, then add 1mol of SBA-15 molecular sieve, ultrasonically vibrate for 12h and then let stand for 8h. Then, it was dried at 120° C. for 8 hours, and the dried molecular sieve particles were calcined at 400° C. for 4 hours, and then calcined at 100° C. / h for 4 hours to obtain a catalyst.

[0027] Exhaust gas is toluene, air accounts for 80% (V / V) of the total amount of mixed exhaust gas (toluene + air), and the flow rate of mixed exhaust gas is 1L / min.

[0028] The outer tube of the DBD reactor has an inner diameter of 20mm and an outer diameter of 25mm; the inner tube has an outer diameter of 7mm and an inner diameter of 5mm. The length is 200mm, the catalyst is evenly filled between the inne...

Embodiment 2

[0033] Prepare 1.5 mol / L of silver nitrate solution and 1 mol / L of cerium nitrate solution. Take 500ml of silver nitrate (0.75mol) solution and 500ml of cerium nitrate (0.5mol) solution and mix well, then add 2mol of SBA-15 grade molecular sieve, ultrasonically vibrate for 8h and then let stand for 12h. Then, it was dried at 110° C. for 6 hours, and the dried molecular sieve particles were calcined at 600° C. for 4 hours, and then heated at 50° C. / h for 4 hours to obtain a catalyst.

[0034] Exhaust gas is trimethylamine, air accounts for 85% (V / V) of the total amount of mixed exhaust gas (trimethylamine+air), and the flow rate of mixed exhaust gas is 1L / min.

[0035] The inner diameter of the outer tube of the DBD reactor is 20mm, the outer diameter is 25mm, the outer diameter of the inner tube is 7mm, and the inner diameter is 5mm. The length is 150mm, and the catalyst is evenly filled between the inner tube and the outer tube. The output voltage of the high-voltage power s...

Embodiment 3

[0040] Prepare 2mol / L of silver nitrate solution and 1mol / L of manganese nitrate solution. Take 250ml of silver nitrate (0.5mol) solution, 250ml of manganese nitrate (0.25mol), and 500ml of cerium nitrate (0.5mol) solution, mix well, add 2mol of SBA-15 molecular sieve, ultrasonically vibrate for 6 hours and then let stand for 10 hours. Then, it was dried at 140° C. for 6 hours, and the dried molecular sieve particles were calcined at 400° C. for 4 hours, and then calcined at 80° C. / h for 5 hours to obtain a catalyst.

[0041] Exhaust gas is toluene, air accounts for 80% (V / V) of the total amount of mixed exhaust gas (toluene + air), and the flow rate of mixed exhaust gas is 1L / min.

[0042]The outer tube of the DBD reactor has an inner diameter of 20mm and an outer diameter of 25mm; the inner tube has an outer diameter of 7mm and an inner diameter of 5mm. The length is 200mm, the catalyst is evenly filled between the inner tube and the outer tube, the output voltage of the hi...

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PUM

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Abstract

The invention belongs to the field of catalysts, and relates to preparation and application of a catalyst suitable for treating organic waste gas through low-temperature plasmas. The catalyst is prepared through an impregnation method; and transition metal silver and manganese are mixed, stirred, ultrasonically vibrated, subjected to still standing, dried, roasted and cooled together with an SBA-15 molecular sieve according to a certain proportion, and then the catalyst is prepared. According to the prepared catalyst, the VOC degrading efficiency can be improved greatly, generation of harmfulby-products is restrained, the disadvantages that as for treating of the organic waste gas through the low-temperature plasmas, the energy utilization rate is low, and the treating effect is poor canfurther be overcome, meanwhile, energy consumption is lowered, and secondary pollution is reduced.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to the preparation and application of a catalyst suitable for low-temperature plasma treatment of organic waste gas. technical background [0002] In recent years, a wide range of air quality substandard conditions have emerged across the country, among which volatile organic pollutants (VOCs) are one of the important prerequisites for the combined pollution of atmospheric regions. Due to its wide range of sources, large emissions, and relative dispersion of the emission industry, it mainly exists in the air in a gaseous state or attached to particulate matter after emission, and directly or indirectly endangers human health, and can further expand the scope of pollution with the spread of airflow. Therefore, the control of VOCs has become an important task to control the combined pollution of the current atmospheric region. [0003] Volatile organic compounds (VOCs) refer to various organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01D53/32B01D53/86B01D53/72B01D53/54B01D53/44
CPCB01D53/323B01D53/8621B01D53/864B01D53/8687B01D2257/7027B01D2257/708B01D2259/818B01J23/002B01J29/043B01J29/045B01J2229/186
Inventor 徐炎华张潇李溪刘志英
Owner NANJING UNIV OF TECH
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