Journal
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
Volume 69, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jlp.2020.104344
Keywords
Methane explosion; Explosion suppression; Functional group modified powders; Molecular simulation; Dmol3
Categories
Funding
- National Natural Science Foundation of China [51874120, 51904094, 51674104, 51806056]
- Basic Research Plan of Key Scientific Research Project of Henan University [20A620003]
- Science and Technology Research Project of Henan Province [202102310292]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [19HASTIT042]
- Research Foundation for Youth Scholars of Higher Education of Henan Province [2017GGJS053]
- Program for Innovative Research Team of Henan Polytechnic University [T2018-2]
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Thiol and urea functionalized montmorillonite powders were successfully prepared in this study and characterized using various techniques. The results showed that N-Mt and O-Mt exhibited better explosion suppression effects at the same mass concentration compared to S-Mt and Mt. The mechanism of methane/air explosion suppression by these powders involves the generation of NH4 NCO. and .OH radicals, as well as the presence of negatively electrophilic potential regions on the surface of O-Mt and N-Mt.
Thiol and urea functionalized montmorillonite powders were successfully prepared by silane coupling agent treatments in this work. The pyrolysis characteristics, surface functional groups, and distribution of particle size of untreated montmorillonite powders (Mt), the hydroxyl functionalized montmorillonite (O-Mt), the urea functionalized montmorillonite (N-Mt), and the thiol functionalized montmorillonite (S-Mt), which was derived from the previous research, were respectively characterized by utilizing the thermogravimetric differential scanning calorimetry, Fourier transform infrared spectroscopy, as well as the laser particle analyzer. The suppression effect of the S-Mt, O-Mt, Mt, and N-Mt on a 9.5% CH4 explosion was tested in the duct system (5 L). The obtained results indicated that N-Mt and O-Mt exhibited a better explosion suppression effect than Mt and S-Mt at the same mass concentration. Additionally, the methane/air explosion suppression mechanism of these powders could be explained by molecular simulation results that indicated the negatively electrophilic potential regions exist on the surface of O-Mt and N-Mt. Moreover, NH4 NCO. and .OH radicals, which can interrupt explosive chain reactions, were easily generated by N-Mt and O-Mt.
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