NOx concentration: first dataset of measurements on NOx formation in atmospheric-pressure microwave plasma

This data presents the experimental results obtained during the execution of selected tasks from the project titled: "Wytwarzanie NOx w atmosferycznej plazmie mikrofalowej – badanie wpływu 'quenchingu' oraz wzbudzenia oscylacyjnego cząsteczek" (English: "NOx formation in an atmospheric pressure microwave plasma – investigating the impact of quenching and vibrational excitation of molecules"), funded by the Polish National Science Centre (NCN), Project No. 2022/47/D/ST8/01512.

The project focuses on the formation of nitrogen oxides (NOx) in atmospheric-pressure microwave plasma.

The presented data includes measurements of nitrogen oxides (NOx), performed using an FTIR analyzer (GASMET), obtained from a microwave plasma reactor under various experimental conditions.

The dataset consist of four files:

1. Initial

Contains results obtained at the beginning of the project, while methods and procedures were still under development. It includes different flow rates and power inputs tested using compressed air. This set demonstrates the basic correlation between gas flow rate, input power, and the amount of NOx produced.

2. Nozzle

A compilation of results from two measurement sets with a well-developed methodology: one using a nozzle-type reactor and the other using a reactor without a nozzle. Both sets include various flow rates and power inputs tested with compressed air. This dataset illustrates the improvement in process efficiency due to the application of the nozzle.

3. Oxygen_no_nozzle

A compilation of results for different O2 concentrations using a reactor without a nozzle. This set shows the influence of O2 content on NOx production.

4. Oxygen_nozzle

A compilation of results for different O2 concentrations using a reactor with a nozzle. This set also shows the influence of O2 content on NOx production.

Variables included in the dataset:

Flow rate, SLM (standard liters per minute): Volumetric flow rate of airor O₂/N₂ mixture, ranging from 20 to 100 SLM depending on the case.

Power, W: Microwave input power, ranging from 600 to 1800 W depending on the case.

NO, ppm: Nitric oxide concentration (in volumetric ppm).

NO error, ppm: Uncertainty of NO measurement.

NO₂, ppm: Nitrogen dioxide concentration (in volumetric ppm).

NO₂ error, ppm: Uncertainty of NO₂ measurement.

NOx, ppm: Sum of NO and NO₂ concentrations (in volumetric ppm).

NOx error, ppm: Uncertainty of NOx measurement.

EC, MJ/mol: Energy cost of NOx formation.

EC error, MJ/mol: Uncertainty of energy cost determination.

O₂, %: Oxygen content in the O₂-N₂ mixture.

Nozzle: Indicates whether the test was carried out in a nozzle reactor (YES) or a non-nozzle reactor (NO).

Improvement: The increase in NOx production calculated based on the ratio of NOx concentration for the case with nozzle and without nozzle