Impact of carbon dioxide on the non-catalytic thermal decomposition of methane

verfasst von

Tobias Marquardt, Sebastian Wendt, Stephan Kabelac

Abstract

Economically and ecologically, the thermal decomposition of methane is a promising process for large scale hydrogen production. In this experimental study, the non-catalytic decomposition of methane in the presence of small amounts of carbon dioxide was analyzed. At large scales, natural gas or biomethane are possible feedstocks for the thermal decomposition and can obtain up to 5% carbon dioxide. Gas recycling can increase the amount of secondary components even further. Experiments were conducted in a packed flow reactor at temperatures from 1250 to 1350 K. The residence time and the amounts of carbon dioxide and hydrogen in the feed were varied. A methane conversion of up to 55.4% and a carbon dioxide conversion of up to 44.1% were observed. At 1300 K the hydrogen yield was 95% for a feed of methane diluted in nitrogen. If carbon dioxide was added to the feed at up to a tenth with regard to the amount of supplied methane, the hydrogen yield was reduced to 85%. Hydrogen in the feed decreases the reaction rate of the methane decomposition and increases the carbon dioxide conversion.

Organisationseinheit(en)

Institut für Thermodynamik

Typ

Artikel

Journal

ChemEngineering

Band

5

Seiten

1-14

Anzahl der Seiten

14

ISSN

2305-7084

Publikationsdatum

03.03.2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine chemische Verfahrenstechnik, Allgemeiner Maschinenbau, Allgemeine Energie

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.3390/chemengineering5010012 (Zugang: Offen)