Comparison of thermal and catalytic cracking of 1-heptene from ReaxFF reactive molecular dynamics simulations

Fidel Castro-Marcano, Adri C.T. van Duin

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Endothermic catalytic cracking of hydrocarbon fuels is one of the most effective methods for thermal management in high-speed jet engines. Despite extensive research, improved understanding of fundamental reaction mechanisms and chemical events associated with hydrocarbon cracking reactions remains desirable. In this investigation, we used the ReaxFF force field to investigate the initial reaction pathways involved in hydrocarbon cracking over amorphous silica, hydrated amorphous silica, and amorphous aluminosilicate nanoparticles. We performed ReaxFF simulations at 1750, 1850, and 1950. K on large interface systems (∼2250 atoms) composed of an amorphous silica particle surrounded by 100 hydrocarbon molecules. Hydrocarbon cracking proceeded via complex network of reaction pathways and produced hydrogen and a wide range of saturated and unsaturated hydrocarbon products, consistent with experimental results. Analysis of trajectories from ReaxFF simulations showed complex initiation chemistry for thermal and catalytic cracking of 1-heptene. In general, thermal cracking of 1-heptene was mainly initialed by C. C bond scission followed by free radical reaction mechanism, whereas catalytic cracking was predominantly activated by C. C bond scission, protonation and dehydrogenation. This work demonstrates that ReaxFF reactive force field can be a useful approach for examining the complex chemistry associated with hydrocarbon cracking.

Original languageEnglish (US)
Pages (from-to)766-775
Number of pages10
JournalCombustion and Flame
Volume160
Issue number4
DOIs
StatePublished - Apr 1 2013

Fingerprint

Catalytic cracking
Hydrocarbons
Molecular dynamics
hydrocarbons
molecular dynamics
Computer simulation
Silicon Dioxide
simulation
silicon dioxide
Silica
field theory (physics)
cleavage
chemistry
jet engines
hydrocarbon fuels
Free radical reactions
Jet engines
dehydrogenation
Aluminosilicates
Protonation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

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Comparison of thermal and catalytic cracking of 1-heptene from ReaxFF reactive molecular dynamics simulations. / Castro-Marcano, Fidel; van Duin, Adri C.T.

In: Combustion and Flame, Vol. 160, No. 4, 01.04.2013, p. 766-775.

Research output: Contribution to journalArticle

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