Sulphur group analysis in solid matrices by atmospheric pressure-temperature programmed reduction

Sulfur release and transformation behaviors of sulfur-containing model compounds during pyrolysis under oxidative atmosphere

“…2, the third peak of dibutylsulfide and the second peaks of tetradecyl mercaptan, 2-methylthiophene, and benzothiophene may all be found at the same temperature region around 500°C. This finding indicates that those compounds can transfer to same structural sulfur-containing compounds during pyrolysis under oxidative atmosphere, which are more stable than model compounds themselves, such as some sulfones or sulfoxides [6]. The second peak region of phenylsulfide around 550°C is nearly identical to that of dibenzothiophene, which can explain transformation of phenylsulfide into the more stable dibenzothiophene structures under oxidative atmosphere.…”

“…According to the literature [6], thiophene structures have typical reduction temperatures of 600°C. This reduction temperature is higher than the decomposition peak temperature of dibenzothiophene under an oxidative atmosphere (550°C).…”

“…Determination of how to load sulfur-containing model compounds is very important to further study their release and transformation behaviors. In reductive atmospheres, different sulfur functional groups have been observed to decompose to some extent over a specific temperature range as follows: alkylthiols < arylthiols < disulfides < dialkyl sulfides < alkylaryl sulfides alkylaryl sulfoxides alkylaryl sulfones < pyrite < diaryl sulfides diaryl sulfoxides < diaryl sulfones < simple thiophenic structures < troilite < inorganic sulfates and complex thiophenic structures [5][6][7]. Sulfur transformation in raw coal, model compounds, or solvent extracts from coal during pyrolysis under He and H 2 atmospheres has also been studied in detail by pyrolysis with mass spectrometer (Py-MS) [4,[8][9][10].…”

Composition of extraction products from alkylated high-sulphur coals

“…1-4). The AP-TPR analysis was performed according to the procedure described earlier [21]. Portions of 40 mg of the samples studied were mixed with 60 mg of fumed silica and placed in a quartz reactor heated from room temperature to 1000 ± C at a linear temperature increase of 5 ± C/min.…”

Organic and inorganic sulphur compounds releases from high-pyrite coal pyrolysis in H 2 , N 2 and CO 2 : Test case Chinese LZ coal

“…AP-TPR/MS is a reliable method for sulphur group characterization in coal, which has already been successfully applied for sulphur functionality determination during coal pyrolysis in a reducing or inert flow [22][23][24][25][26][27][28][29][30][31][32]. The AP-TPR method is based on experimental findings that a specific sulphur functional group is maximal hydrogenated/reduced at a specific temperature range.…”