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Table 4 Activation energies, pre-exponential factors, and correlation coefficients (R2) for the entire combustion reaction using Friedman method

From: Investigation into the combustion kinetics and spontaneous ignition of sweet sorghum as energy resource

Conversion (mg/mg)

Friedman method

Conversion (mg/mg)

Friedman method

E (kJ/mol)

A (1/s)

R2

Eavg (kJ/mol)

SD

Relative SD

0.1

129.57

5.25 × 109

0.9998

0.1–0.5

132.91

8.60

6.47

0.2

143.38

7.30 × 1010

0.9999

0.6–0.7

79.40

7.21

9.07

0.3

140.19

2.14 × 1010

0.9992

0.8–0.9

169.44

2.45

1.45

0.4

132.49

2.21 × 109

0.9994

    

0.5

118.92

6.00 × 107

0.9961

    

0.6

72.20

1.26 × 103

0.9918

    

0.7

86.61

6.30 × 103

0.9994

    

0.8

166.99

7.97 × 109

0.9893

    

0.9

171.89

1.41 × 1010

0.9993