Simultaneous production of hydrogen and carbon nanotubes from biogas: On the design of combined process
Issued Date
2022-04-15
Resource Type
ISSN
03603199
Scopus ID
2-s2.0-85127361918
Journal Title
International Journal of Hydrogen Energy
Volume
47
Issue
32
Start Page
14432
End Page
14452
Rights Holder(s)
SCOPUS
Bibliographic Citation
International Journal of Hydrogen Energy Vol.47 No.32 (2022) , 14432-14452
Suggested Citation
Rattanaamonkulchai R., Kludpantanapan T., Nantapong P., Srifa A., Koo-Amornpattana W., Chaiwat W., Sakdaronnarong C., Kiatphuengporn S., Charinpanitkul T., Assabumrungrat S., Wongsakulphasatch S., Eiad-ua A., Sudoh M., Watanabe R., Fukuhara C., Ratchahat S. Simultaneous production of hydrogen and carbon nanotubes from biogas: On the design of combined process. International Journal of Hydrogen Energy Vol.47 No.32 (2022) , 14432-14452. 14452. doi:10.1016/j.ijhydene.2022.02.179 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/86921
Title
Simultaneous production of hydrogen and carbon nanotubes from biogas: On the design of combined process
Other Contributor(s)
Abstract
We introduced a novel combined process of CO2 methanation (METH) and catalytic decomposition of methane (CDM) for simultaneous production of hydrogen (H2) and carbon nanotubes (CNTs) from biogas. In this process, biogas is catalytically upgraded into CH4-rich gas in METH reactor using Ni/CeO2 catalyst, and the obtained CH4-rich gas is subsequently decomposed into H2 and CNTs in CDM reactor over CoMo/MgO catalyst. Among the three different process scenarios proposed, the combined process with a steam condenser equipped between METH and CDM reactors could greatly improve a CNTs productivity. The CNTs production yield increased by more than 2.5-fold, maximizing at 9.08 gCNTs/gCat with a CNTs purity of 90%. The deposited carbon product was characterized as multi-walled carbon nanotubes (MWCNTs) with a surface area of 136.0 m2/g, comparable with commercial CNTs of 199.8 m2/g. The remarkable IG/ID ratio of 2.18 confirms a superior portion of graphitic carbon in the synthesized CNTs upon the commercial CNTs with IG/ID = 0.74. Notably, the CH4 conversion reached 94.5%, while the CO2 conversion achieved 100%, resulting in the H2 yield and H2 purity higher than 90%. This combined process demonstrates a promising route for production of high quality CNTs and high purity H2 with complete CO2 conversion using biogas as abundant renewable energy resources. In addition, the test of raw biogas showed no deactivation of catalyst, justifying the implementation of the developed process for real biogas without purification.