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Hydrogen moderated methane pyrolysis in microwave plasma - data collection

Version 1.0

Wnukowski, Mateusz, 2026, "Hydrogen moderated methane pyrolysis in microwave plasma - data collection", https://doi.org/10.18150/1XN3F7, RepOD, V1

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Description

This dataset presents results obtained during experiments investigating methane pyrolysis in an atmospheric microwave plasma with hydrogen addition. Additionally, it includes temperature profiles used for chemical kinetics simulations of the process. These profiles were developed based on data available at https://rdpcidat.rub.de/node/989 and provided as additional data for:

Kreuznacht, S., Böke, M., & von Keudell, A. (2024). Simulation of a Microwave Plasma Torch Used for Hydrogen Production via Methane Pyrolysis. Plasma Processes and Polymers, 21, 2400169. https://doi.org/10.1002/ppap.202400169

The dataset consists of five files:

1. OES_below_waveguide

This file contains optical emission spectroscopy (OES) measurements of plasma collected 6.5 cm below the microwave waveguide. The process parameters were a total gas flow rate of 60 SLM (standard liters per minute) and a microwave input power of 900 W. The experiments were conducted using a gas mixture containing 2% CH4, with the balance consisting of Ar and varying additions of H2. The H2:CH4 ratio was varied from 0:1 to 4:1.

The dataset includes Wavelength (nm) and Intensity (a.u.) values for H2:CH4 ratios of 0:1, 1:1, 2:1, 3:1, and 4:1. The measurement for the 0:1 ratio was performed over the wavelength range of 400-800 nm and therefore includes its own wavelength column. Measurements for all other ratios were conducted over the range of 300-900 nm and share a common wavelength axis.


2. OES_waveguide

This file contains optical emission spectroscopy (OES) measurements of plasma collected at the waveguide position. The process parameters were a total gas flow rate of 60 SLM and a microwave input power of 900 W. The experiments were conducted using a gas mixture containing 2% CH₄, with the balance consisting of Ar and varying additions of H2. The H2:CH4 ratio was varied from 0:1 to 4:1. The dataset includes Wavelength (nm) and Intensity (a.u.) values for H2:CH4 ratios of 0:1, 1:1, 2:1, 3:1, and 4:1. Measurements corresponding to an H2:CH4 ratio of 3:1 were repeated five times.


3. Raman

This file contains Raman spectroscopy measurements of carbonaceous material samples obtained under process conditions of 60 SLM total gas flow rate and 900 W microwave input power. The experiments were conducted using a gas mixture containing 2% CH₄, with the balance consisting of Ar and either no hydrogen or additional H2. The dataset includes Raman shift (cm⁻¹) and Intensity (a.u.) values for H2:CH4 ratios of 0:1, 1:1, and 2:1. Measurements for each ratio were repeated five times.


4. Shares

This file contains volumetric concentrations of Iilet methane (CH4 IN) and outlet concentrations of methane (CH4 OUT), ethylene (C2H4), and acetylene (C2H2).

The data are reported for the following process parameters:

  • H2:CH4 ratio: 0:1, 1:1, 2:1, 3:1, 4:1, and 5:1
  • Flow rate: 30, 45, or 60 SLM (standard liters per minute)
  • Power (microwave input power): 600, 900, or 1200 W


In addition, each measurement is assigned a test identifier in the column labeled "test", reflecting repeated experimental runs performed under identical operating conditions.


5. temperatures

This file contains temperature profiles used as inputs for chemical kinetics simulations. The data consist of multiple pairs of variables: Distance (cm) and Temperature (K). Each pair represents a temperature profile at a different radial distance from the reactor axis, ranging from 0.5 mm to 7.5 mm, with increments of 0.5 mm.

These profiles were developed based on data available at https://rdpcidat.rub.de/node/989 and provided as supplementary material for:

Kreuznacht, S., Böke, M., & von Keudell, A. (2024). Simulation of a Microwave Plasma Torch Used for Hydrogen Production via Methane Pyrolysis. Plasma Processes and Polymers, 21, 2400169. https://doi.org/10.1002/ppap.202400169

Subject
Chemistry
Keyword

plasmalysis, methane coupling, acetylene, ethylene, turquoise hydrogen, few-layer graphene

CC BY - Creative Commons Attribution 4.0 CC BY - Creative Commons Attribution 4.0

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1 to 5 of 5 Files
OES_below_waveguide.tab
Tabular Data - Original format: MS Excel (XLSX) - 1.4 MB - Aug 6, 2026 - 0 Downloads
License: CC BY - Creative Commons Attribution 4.0
8 Variables, 24985 Observations - UNF:6:xDXGzBuIen6opDPCWQSIIw==
This file contains optical emission spectroscopy (OES) measurements of plasma collected 6.5 cm below the microwave waveguide.
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OES_waveguide.tab
Tabular Data - Original format: MS Excel (XLSX) - 1.9 MB - Aug 6, 2026 - 0 Downloads
License: CC BY - Creative Commons Attribution 4.0
12 Variables, 16384 Observations - UNF:6:7W0Zv4vWiwza/8RU/0PvNA==
This file contains optical emission spectroscopy (OES) measurements of plasma collected at the waveguide position.
Preview
Raman.tab
Tabular Data - Original format: MS Excel (XLSX) - 239.4 KB - Aug 6, 2026 - 0 Downloads
License: CC BY - Creative Commons Attribution 4.0
16 Variables, 1934 Observations - UNF:6:wIuC5IkiP4/RVibL+801Cg==
This file contains Raman spectroscopy measurements of carbonaceous material samples obtained under process conditions of 60 SLM total gas flow rate and 900 W microwave input power.
Preview
shares.tab
Tabular Data - Original format: MS Excel (XLSX) - 9.5 KB - Aug 6, 2026 - 0 Downloads
License: CC BY - Creative Commons Attribution 4.0
8 Variables, 108 Observations - UNF:6:PHdNelnfzD10DCJirU7rKQ==
This file contains volumetric concentrations of inlet methane (CH₄ IN) and outlet concentrations of methane (CH₄ OUT), ethylene (C₂H₄), and acetylene (C₂H₂).
Preview
temperatures.tab
Tabular Data - Original format: MS Excel (XLSX) - 13.1 KB - Aug 6, 2026 - 0 Downloads
License: CC BY - Creative Commons Attribution 4.0
16 Variables, 143 Observations - UNF:6:nmLYQoBfO2aOoBjRYYhTTA==
This file contains temperature profiles used as inputs for chemical kinetics simulations.
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