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Figure 1. 

Contents of Na or K elements in reconstituted tobacco sheets after adding alkali metal salts (measured by ICP‒OES).

Figure 2. 

TG and DTG curves of reconstituted tobacco sheets with varying additions of (a) Na salt and (b) K salt.

Figure 3. 

(a) Weight loss transition temperatures of reconstituted tobacco sheets during pyrolysis at 35–500 °C. (b) Weight loss of reconstituted tobacco sheets in weight loss Stages I–III. Weight loss (left) at 100–300 °C and maximum weight loss rate at temperatures below 500 °C (right) of reconstituted tobacco sheets with added (c) Na salt or (d) K salt.

Figure 4. 

Contents of (a) acetic acid and monoacetin, (b) glycerin and nicotine, (c) 1-hydroxy-2-propanone and 2-furan methanol, and (d) phenol and megastigmatrienone in the pyrolysis gas of reconstituted tobacco sheets with different amounts of added Na salt at 300 °C (semiquantitative results represented by the peak area measured via Py-GC/MS).

Figure 5. 

Contents of (a) acetic acid and monoacetin, (b) glycerin and nicotine, (c) 1-hydroxy-2-propanone and 2-furan methanol, and (d) phenol and megastigmatrienone in the pyrolysis gas of reconstituted tobacco sheets with different amounts of added K salt at 300 °C (semiquantitative restults represented by the peak area measured via Py-GC/MS).

Figure 6. 

TG and DTG curves of (a) the KB sample, (b) the N5 sample, and (c) the K5 sample under different heating rates (5, 10, 15, and 20 °C/min, respectively).

Figure 7. 

Linear relationships between lgβ and 1/T × 10³ at different conversion ratios (α) for (a) the KB sample, (b) the N5 sample, and (c) the K5 sample. (d) Linear relationships between ln(β/T_P²) and 1/T_P × 10³ for the KB sample, the N5 sample, and the K5 sample.

Figure 8. 

E_α for the pyrolysis of reconstituted tobacco sheets (KB, K5, N5) at different conversion ratios (α).