Effects of Fe3+ on sulfur release during pyrolysis of sulfur-containing model compounds under different atmospheres

• Published in: Journal of thermal analysis and calorimetry 2022, Vol.147 (2), p.1597-1605
• Main Authors: Wang, Junshan, Guo, Huiqing, Xue, Yaming, Wang, Meijun, Hu, Ruisheng, Liu, Fenrong
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Atmospheres; Chemistry; Chemistry and Materials Science; Decomposition; Gas chromatography; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Pyrolysis; Sulfur; Sulfur compounds
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-020-10437-z

In this study, dibutyl sulfide (DS), phenyl sulfide (PS) and 2-methyl thiophene (2-MT) were selected as model compounds to investigate the effect of Fe 3+ on sulfur release by pyrolysis connected with gas chromatography (Py-GC) and pyrolysis coupled with mass spectrometer (Py-MS) under Ar and 3% O 2 –Ar atmospheres. It is found that main forms of sulfur-containing gases are different during their pyrolysis under different atmospheres. Sulfur gases are mainly SO 2 under 3% O 2 –Ar atmosphere. Under Ar atmosphere, PS is more difficult to decompose than 2-MT, while easier under 3% O 2 –Ar atmosphere. 0.5% Fe 3+ only significantly promotes the sulfur release amount of PS under Ar atmosphere. However, 2% Fe 3+ is more effective for DS and 2-MT to decompose under Ar atmosphere and it promotes all these sulfur gases release at lower temperatures under Ar atmosphere. And 2% Fe 3+ is more beneficial for all these three compounds to decompose under 3%O 2 –Ar atmosphere than 0.5% Fe 3+ , especially for PS. Therefore, 2% Fe 3+ can more efficiently promote sulfurs release of these sulfur compounds.