Details

Autor(en) / Beteiligte

• Sun, Eddie
• Zhai, Shang
• Kim, Dohyung
• Gigantino, Marco
• Haribal, Vasudev
• Dewey, Oliver S.
• Williams, Steven M.
• Wan, Gang
• Nelson, Alexander
• Marin-Quiros, Sebastian
• Martis, Joel
• Zhou, Chengshuang
• Oh, Jinwon
• Randall, Richard
• Kessler, Max
• Kong, Dongjae
• Rojas, Jimmy
• Tong, Andrew
• Xu, Xintong
• Huff, Cassandra
• Pasquali, Matteo
• Gupta, Raghubir
• Cargnello, Matteo
• Majumdar, Arun

Titel

A semi-continuous process for co-production of CO2-free hydrogen and carbon nanotubes via methane pyrolysis

Ist Teil von

• Cell reports physical science, 2023-04, Vol.4 (4), p.101338, Article 101338

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Heterogeneous catalytic pyrolysis of hydrocarbons to produce CO2-free hydrogen and high-quality solid carbon have historically been stymied by issues related to catalyst deactivation by carbon formed during pyrolysis on the catalyst surface. In addition, a system that demonstrates sustained performance in terms of high conversion, high H2 yield, and high quality of produced carbon has remained elusive. Here, we propose and demonstrate a semi-continuous methane pyrolysis process to H2 and carbon nanotubes (CNTs) consisting of repeated pyrolysis and in situ (i.e., within the reactor) CNT dislodging by vigorous steam/argon fluidization. With this process, we demonstrate 10 process cycles with high H2 yield from CH4 and CNT dislodging in a fluidized-bed reactor with an Fe/θ-Al2O3 catalyst synthesized by an easily scalable incipient wetness impregnation process. We also identify and present opportunities for future catalyst and process development. [Display omitted] •Proposition and demonstration of a semi-continuous pyrolysis process•Production of CO2-free H2 and carbon nanotubes from CH4 on a supported catalyst•Demonstration of in situ CNT dislodging for repeated catalyst use Sun, Zhai, and Kim et al. present a methane pyrolysis catalyst to produce carbon nanotubes (CNTs) and propose and demonstrate a semi-continuous process that features in situ CNT dislodging so that the catalyst can be continuously cycled. The produced CNTs could offset the cost of H2 production in a commercialized process.