Combined non-thermal plasma and catalytic oxidation of low concentration methane
Javed, Irzam (2023)
Diplomityö
2023
School of Engineering Science, Kemiantekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe202401223811
https://urn.fi/URN:NBN:fi-fe202401223811
Tiivistelmä
This master´s thesis studies the effect of non-thermal plasma and the hybridized plasma-catalysis system on the methane abatement by using Dielectric Barrier Discharge (DBD) reactor. The catalysts in the hybridized plasma-catalysis system are found to enhance the selectivity towards carbon dioxide.
The literature part of the thesis presents methane sources, various methods for methane abatement and successful examples related. The effect of different catalysts on methane conversion is also reviewed. Plasma technology specifically the non-thermal plasma chemistry and the plasma effect has been provided in detail.
In the experimental part, the effect of plasma power alone and in the presence of catalysts was studied. Total of seven catalysts were used. The experiments were conducted in DBD reactor at atmospheric pressure having the feed flowrate of 200 ml/min while changing the plasma power and catalysts.
According to the experimental results, the system with only plasma achieved the highest methane conversion 95 %, encompassing both partial and complete oxidation reactions. In contrast, the hybridized system, specifically with 1 % Pd/Al2O3, exhibited a slightly lower methane conversion 88 % than the plasma alone system. However, the only reaction that took place in this case was complete oxidation because there was no any carbon monoxide formation. Additionally, there was no noticeable difference observed in the formation of NOx throughout the study.
The literature part of the thesis presents methane sources, various methods for methane abatement and successful examples related. The effect of different catalysts on methane conversion is also reviewed. Plasma technology specifically the non-thermal plasma chemistry and the plasma effect has been provided in detail.
In the experimental part, the effect of plasma power alone and in the presence of catalysts was studied. Total of seven catalysts were used. The experiments were conducted in DBD reactor at atmospheric pressure having the feed flowrate of 200 ml/min while changing the plasma power and catalysts.
According to the experimental results, the system with only plasma achieved the highest methane conversion 95 %, encompassing both partial and complete oxidation reactions. In contrast, the hybridized system, specifically with 1 % Pd/Al2O3, exhibited a slightly lower methane conversion 88 % than the plasma alone system. However, the only reaction that took place in this case was complete oxidation because there was no any carbon monoxide formation. Additionally, there was no noticeable difference observed in the formation of NOx throughout the study.