Kinetic Analysis of Co-Pyrolysis of Cellulose and Polypropylene

Supplementary Material

Kinetic Analysis of Co-pyrolysis of Cellulose and Polypropylene

Dadi V. Suriapparao,1 Deepak Kumar Ojha,1Tanumoy Ray1 and R. Vinu1,2,*

1Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai – 600036, India

2National Center for Combustion Research and Development, Indian Institute of Technology Madras, Chennai – 600036, India

* Corresponding Author

Dr. R. Vinu

Department of Chemical Engineering

Indian Institute of Technology Madras

Chennai - 600036

E-mail:

Phone: +91-44-22574187

Table SI 1. Maximum degradation temperature, Tmax (in K), for different heating rates and compositions from differential thermogravimetric data of co-pyrolysis of cellulose and polypropylene.

Heating rate /
Kmin-1 / Tmax (in K) for various compositions (in mass%) of cellulose and polypropylene
C:PP = 80:20 / C:PP = 60:40 / C:PP = 40:60 / C:PP = 20:80
Cellulose / PP / Cellulose / PP / Cellulose / PP / Cellulose / PP
5 / 605.07 / 675.95 / 603.72 / 695.20 / 602.05 / 677.80 / 601.36 / 688.10
10 / 616.64 / 695.82 / 615.11 / 710.09 / 612.33 / 695.05 / 617.15 / 710.52
20 / 629.16 / 718.85 / 628.29 / 735.92 / 624.59 / 720.43 / 628.17 / 728.66
50 / 645.91 / 755.37 / 645.64 / 757.25 / 641.61 / 752.27 / 646.01 / 756.42
100 / 666.68 / 777.08 / 662.77 / 771.99 / 659.62 / 770.85 / 663.64 / 774.73
180 / 683.63 / 791.88 / 678.23 / 787.08 / 680.60 / 788.63 / 673.96 / 788.39

Figure SI 1.Differential mass loss profiles of cellulose-polypropylene mixtures of 60:40 composition at various heating rates, viz., 5, 10, 20, 50, 100, 180 K min-1.

Figure SI 2.First Kissinger plots for (a) cellulose and (b) polypropylene decomposition for different composition of the mixtures. Ea of decomposition can be evaluated from the slope of the linear fits. The regression coefficients for all the linear fits correspond to R2 > 0.99.

Figure SI 3(a)

Figure SI 3(b)

Figure SI 3(c)

Figure SI 3(d)

Figure SI 3(e)

Figure SI 3(f). Kissinger-Akahira-Sunose (KAS) plots showing the variation of Ln(β/T2) versus 1/T for various conversions of cellulose + PP mixtures of different compositions (a) C:PP = 100:0, (b) 80:20, (c) 60:40, (d) 40:60, (e) 20:80, (f) 0:100. The regression coefficients for the linear fits correspond to R2 ≈ 0.98-0.999.

Figure SI 4.Zoomed DSC profiles of polypropylene and C:PP mixtures at 20 K min-1 to show the melting and recrystallization transition occurring in polypropylene.