Effects of molecular hydrogen, hydrogen donors and catalysts on the decomposition of 1,3-diphenylpropane
- China Univ. of Mining and Technology, Xuzhou, Jiangsu (China). Dept. of Energy Utilization and Chemical Engineering
- Univ. of Tokyo (Japan). Dept. of Chemistry and Biotechnology
The effects of molecular hydrogen, hydrogen donors and catalysts on the decomposition of 1,3-diphenylpropane (DPP), as a probe for revealing the mechanism of coal liquefaction, were investigated in decalin solvent at 400 C. DPP decomposition proceeds via the cleavage of the C{sub alk}-C{sub alk} bond in DPP, which is markedly promoted by active radicals such as the resulting benzyl radicals (PhCH{sub 2{center_dot}}) from DPP decomposition. The reaction of molecular hydrogen with PhCH{sub 2{center_dot}} produces free hydrogen atoms, which can abstract hydrogen from the {alpha}-methylene group in DPP or add on the ipso position of benzene ring in DPP. In addition, molecular hydrogen prevents styrene, a decomposition product of DPP, from reacting with PhCH{sub 2{center_dot}} by reducing styrene. Due to these roles, molecular hydrogen promotes DPP decomposition. The addition of hydrogen donor significantly inhibits DPP decomposition, and the inhibiting effect increases with hydrogen-donatability of a donor used, i. e., 9,10-dihydroanthracene > 9,10-dihydrophenanthrene > tetralin. Under pressurized hydrogen, adding FeS{sub 2} further accelerates DPP decomposition, whereas adding ultra fine iron powder inhibits DPP decomposition.
- OSTI ID:
- 324704
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
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