Thermal decomposition of tetramethylsilane using SPST
587
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sition of TMS and their gas phase contributions to the
total reaction (figure 10).
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The pyrolysis of TMS in the temperature range of
1058–1194 K was investigated, using a SPST. The
main reaction products in the experiments are found
to be methane and ethylene; and the minor reac-
tion products are ethane and propylene respectively.
The obtained rate coefficient for the total decomposi-
tion of TMS in the lower temperature range is ktotal
(1058–1130 K) = (4.61 0.70) × 1018exp (−(79.9 kcal
mol−1 3.5)/RT) s−1, and at high temperature range
is, ktotal (1130–1194 K) = (1.33
0.19) × 106exp
(−(15.3 kcal mol−1 3.5)/RT) s−1. The rate coefficient
obtained for the formation of methane in the studied
temperature range is kmethane (1058–1194 K) = (4.36
1.23) × 1014 exp (−(61.9 kcal mol−1
4.9)/RT) s−1
where R is expressed in the units of kcal K−1 mol−1. The
decomposition mechanism is proposed using 21 species
and 38 elementary reactions. The concentration profiles
of all the products obtained using the proposed scheme
is observed to be in good agreement with the experi-
mental findings. The C-Si bond scission is the govern-
ing reaction pathway in the complete decomposition of
TMS in the temperature range of 1058–1194 K.
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Acknowledgments
B.R. thanks Council of Scientific and Industrial
Research (CSIR), Government of India for funding.
A.P. is very grateful to CSIR for providing a research
fellowship. A.P. also thank Mr. G. Sudhakar and Mr. M.
Balaganesh for fruitful discussions and their help.
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