Figure 5.

Chemical transformations of propane at 14 GPa and T = 930–1580 K (±100 K). The reference peaks for C-H valence of saturated hydrocarbon compounds were obtained from^2–4,12, for unsaturated compounds the reference peaks were obtained from^31,32, and for graphite (soot) modes, the reference peaks were obtained from^27,28. The reference peaks for C-C stretching and C-C bending of hydrocarbons were obtained for ethane from¹², the peaks for propane were obtained from^12,37, the peaks for n-butane from^12,37, the peaks for n-pentane from³⁹, and the peaks for n-hexane were obtained from³⁸. The propane remained stable at 930 K. The spectra of untouched propane are in good correspondence with the previous experiments we carried out³⁷. The hydrogen vibrational modes were investigated in those experiments³³.