Table 3. TGA pyrolysis of RH, CO and SA activation energies (Ea) and correlation factors (R2) for conversion values using the Friedman, KAS and OFW models.
| Sample | Conversion(α) | Activation energy Friedman model (KJ/mol) | R2 | Activation energy KAS model (KJ/mol) | R2 | Activation energy OFW model (KJ/mol) | R2 |
|---|---|---|---|---|---|---|---|
| RH | 0.05 | 85.13 | 0.4316 | 64.28 | 0.1715 | 67.86 | 0.2706 |
| 0.1 | 298.65 | 0.6464 | 99.57 | 0.9032 | 101.98 | 0.9157 | |
| 0.15 | 670.91 | 0.7196 | 116.83 | 0.9996 | 118.70 | 0.9996 | |
| 0.2 | 486.51 | 0.2854 | 120.43 | 0.9316 | 122.40 | 0.9400 | |
| 0.25 | 281.96 | 0.1591 | 144.31 | 0.5895 | 145.56 | 0.6261 | |
| 0.3 | 606.28 | 0.8325 | 171.58 | 0.9713 | 171.90 | 0.9739 | |
| 0.35 | 753.25 | 0.7293 | 153.37 | 0.9832 | 154.67 | 0.9850 | |
| 0.4 | 773.26 | 0.7024 | 149.56 | 0.9966 | 151.21 | 0.9968 | |
| 0.45 | 556.40 | 0.6936 | 145.12 | 1.0000 | 147.31 | 1.0000 | |
| 0.5 | 277.62 | 0.6238 | 120.81 | 0.9927 | 124.42 | 0.9937 | |
| 0.55 | 161.57 | 0.6998 | 90.16 | 0.9826 | 95.63 | 0.9854 | |
| 0.6 | 173.14 | 0.9218 | 80.81 | 0.9967 | 87.21 | 0.9975 | |
| 0.65 | 164.44 | 0.9390 | 72.19 | 0.9874 | 79.40 | 0.9912 | |
| 0.7 | 62.39 | 0.9892 | 58.34 | 0.9634 | 66.60 | 0.9757 | |
| 0.75 | 147.12 | 0.7562 | 51.70 | 1.0000 | 60.68 | 0.9999 | |
| 0.8 | 236.81 | 0.9826 | 61.41 | 0.9971 | 70.30 | 0.9983 | |
| CO | 0.05 | -19.41 | -0.1791 | -35.69 | 0.6911 | -27.17 | 0.5580 |
| 0.1 | -37.11 | -0.4696 | -75.39 | 0.6176 | -64.06 | 0.5430 | |
| 0.15 | -32.44 | -0.9903 | -125.92 | -0.2810 | -111.53 | -0.3444 | |
| 0.2 | 939.56 | 0.6293 | 205.41 | -0.3813 | 203.75 | -0.3444 | |
| 0.25 | 1097.16 | 0.9973 | 177.35 | 0.6604 | 177.36 | 0.6870 | |
| 0.3 | 1525.36 | 0.9538 | 181.04 | 0.8798 | 181.06 | 0.8908 | |
| 0.35 | 2122.20 | 0.9603 | 170.62 | 0.8953 | 171.07 | 0.9054 | |
| 0.4 | 2624.97 | 0.9476 | 170.30 | 0.8951 | 171.07 | 0.9054 | |
| 0.45 | 2774.20 | 0.9550 | 192.38 | 0.8604 | 192.15 | 0.8731 | |
| 0.5 | 1816.22 | 0.9291 | 213.93 | 0.8808 | 212.71 | 0.8903 | |
| 0.55 | 906.20 | 0.7341 | 231.39 | 0.9982 | 229.38 | 0.9983 | |
| 0.6 | 432.58 | 0.8272 | 192.93 | 0.9998 | 193.29 | 0.9998 | |
| 0.65 | 261.41 | 0.9145 | 132.81 | 0.9859 | 136.48 | 0.9879 | |
| 0.7 | 257.53 | 0.9107 | 114.60 | 0.9849 | 119.66 | 0.9876 | |
| 0.75 | 236.73 | 0.9534 | 95.01 | 0.9696 | 101.45 | 0.9760 | |
| 0.8 | 229.94 | 0.9282 | 88.63 | 0.9551 | 95.69 | 0.9659 | |
| SA | 0.05 | -88.61 | 0.2234 | -71.99 | 0.8867 | -62.13 | 0.8644 |
| 0.1 | -138.40 | 0.7593 | -147.10 | 0.9831 | -132.28 | 0.9810 | |
| 0.15 | 1593.91 | 0.8619 | 563.97 | 0.3515 | 545.00 | 0.3652 | |
| 0.2 | 1676.91 | 0.9999 | 375.82 | 0.7451 | 366.14 | 0.7558 | |
| 0.25 | 1507.60 | 0.9734 | 334.70 | 0.8828 | 327.00 | 0.8883 | |
| 0.3 | 1221.76 | 0.9757 | 310.26 | 0.8882 | 304.27 | 0.8940 | |
| 0.35 | 1110.52 | 0.9964 | 219.73 | 0.8101 | 218.28 | 0.8244 | |
| 0.4 | 704.91 | 0.9880 | 225.04 | 0.8756 | 223.56 | 0.8861 | |
| 0.45 | 432.71 | 0.9930 | 175.42 | 0.8676 | 176.68 | 0.8814 | |
| 0.5 | 385.29 | 0.9836 | 126.35 | 0.9046 | 130.20 | 0.9191 | |
| 0.55 | 420.49 | 0.9983 | 120.59 | 0.8226 | 125.02 | 0.8487 | |
| 0.6 | 402.89 | 1.0000 | 111.11 | 0.8196 | 116.38 | 0.8497 | |
| 0.65 | 396.47 | 0.9941 | 107.80 | 0.8690 | 113.51 | 0.8920 | |
| 0.7 | 379.67 | 0.9980 | 94.83 | 0.8668 | 101.42 | 0.8940 | |
| 0.75 | 362.42 | 0.9985 | 90.30 | 0.8450 | 97.37 | 0.8783 | |
| 0.8 | 327.05 | 0.9322 | 83.14 | 0.7639 | 90.87 | 0.8169 |