Key words: propylene, supercritical water, pyrite, oligomerization, sulfidation, synergetic effect
The effect of supercritical water and pyrite on the transformations of propylene at programmed heating (1.5 K/min) of the reagents to 718 K is studied. The products are analyzed by IR and 1H NMR spectroscopy, mass-spectrometry and gas chromatography/mass-spectrometry. Based on the temperature dependences of pressure of the reagents it is stated that in the absence of water, the addition of pyrite reduces the initial temperature of propylene oligomerization. In the absence of pyrite, the addition of water suppresses the propylene oligomerization. A synergetic effect of supercritical water and pyrite on the degree of propylene conversion is revealed. It is shown that in the presence of pyrite, hydrogen sulfide, thiols and methyl-derivatives of thiophene are formed and the yield of aromatic and polyaromatic hydrocarbons is increased. The mechanisms of the observed processes are discussed.