Abstract
The interfacial microenvironments between catalysts and C4 hydrocarbons for the isobutane alkylation is of vital importance to producing high-quality alkylate. In the present work, the interfacial properties between Brønsted acidic ionic liquids (BILs)/H2SO4 and C4 mixtures, as well as between the cationic and anionic surfactants/H2SO4 and C4 mixtures were investigated using molecular dynamic (MD) simulations, in which BILs share different alkyl chain length on cations with or without a sulfonic acid group. It indicated both BILs and surfactants can enhance the H2SO4/C4 reactants interfacial properties and facilitate C4 reactants dissolution, contributing to a better catalytic performance. The enhancement of the interfacial properties can be ascribed into the stronger density enrichment and perpendicular behaviors of the longer alkyl chains at the interface. Compared to non-SFILs, sulfonic-acid-functionalized Brønsted acidic ionic liquids (SFILs) can facilitate a higher dissolution of isobutane in both bulk and interfacial regions, but result in a lower interfacial diffusion. In addition, the much stronger interfacial enrichment of surfactants without mixing with H2SO4 leads to a worse catalytic performance than BILs. However, the better mixing between BILs and H2SO4 leading to better catalytic performance suggests the important role of the BILs acting as phase transfer catalyst for the H2SO4-catalyzed alkylation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.