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Synthesis of Ni-based catalysts by hexamethylenetetramine-nitrates solution combustion method for co-production of hydrogen and nanofibrous carbon from methane

Kuvshinov, D. G.; Kurmashov, P. B.; Bannov, A. G.; Popov, M. V.; Kuvshinov, G. G.

Authors

D. G. Kuvshinov

P. B. Kurmashov

A. G. Bannov

M. V. Popov

G. G. Kuvshinov



Contributors

Dmitriy Kuvshinov
Project Leader

Abstract

It was shown that hexamethylenetetramine (HMT)is a new effective fuel for single-step solutions combustion synthesis (SCS)of supported Ni catalysts for methane decomposition into hydrogen and nanofibrous carbon. Several generalized chemical equations reflecting different ideas about combustion of the HMT−Ni(NO 3 ) 2 −Cu(NO 3 ) 2 −Al(NO 3 ) 3 −H 2 O system have been derived. On the basis of those equations the adiabatic combustion temperature (T ad )and the amount of gaseous products (n g )have been calculated depending on the ignition temperature (T 1 ), water content (m), excess fuel coefficient (φ), and the composition of the obtained solid product. The calculations have shown that T ad , depending on m and φ, changes from hundreds to thousands of degrees Kelvin. Increase of Al 2 O 3 content in the catalyst up to 0.6 increases T ad by hundreds of degrees, and that increase of the Ni:NiO ratio up to 0.5 lowers T ad by tens of degrees. Three samples of the supported unreduced 0.97NiO/0.03Al 2 O 3 catalyst were successfully prepared with the help of the SCS method using HMT as the fuel at φ=0.7. Those samples, obtained at reaction mixture preliminary heating rates V = 1, 10, 15 K/min were characterised using XRD, TEM, and SEM, and further tested in a pure methane decomposition reaction (100 L CH4 /h/g cat , 823К, 1 bar). Nanoparticles of metal Ni were found in the SCS products, in contrast to cases when other types of fuel were used with φ

Citation

Kuvshinov, D. G., Kurmashov, P. B., Bannov, A. G., Popov, M. V., & Kuvshinov, G. G. (2019). Synthesis of Ni-based catalysts by hexamethylenetetramine-nitrates solution combustion method for co-production of hydrogen and nanofibrous carbon from methane. International Journal of Hydrogen Energy, 44(31), 16271-16286. https://doi.org/10.1016/j.ijhydene.2019.04.179

Journal Article Type Article
Acceptance Date Apr 17, 2019
Online Publication Date May 18, 2019
Publication Date Jun 21, 2019
Deposit Date Jun 11, 2019
Publicly Available Date May 19, 2020
Journal International Journal of Hydrogen Energy
Print ISSN 0360-3199
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 44
Issue 31
Pages 16271-16286
DOI https://doi.org/10.1016/j.ijhydene.2019.04.179
Keywords Nickel-based catalyst; Solution combustion synthesis; Hexamethylenetetramine; Adiabatic combustion; Methane decomposition; Hydrogen and carbon nanofibers production
Public URL https://hull-repository.worktribe.com/output/1974410
Publisher URL https://www.sciencedirect.com/science/article/pii/S036031991931612X?via%3Dihub
Additional Information ©2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

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