分子氢和二硫化铁对1，3─二苯丙烷分解的促进作用

PROMOTIONAL EFFECTS OF MOLECULAR HYDROGEN AND PYRITE ON 1,3─DIPHENYLPROPANE DECOMPOSITION

以１，３─二苯丙烷（ＤＰＰ）作为煤相关模型化合物，考察了在４００℃下分子氢和催化剂对ＤＰＰ分解反应的作用。ＤＰＰ的分解反应主要经Ｃ＿烷─Ｃ＿烷键的断裂进行，由ＤＰＰ的分解产生的苄基自由基（ＰｈＣＨ＿２）等活性自由基显著促进ＤＰＰ中Ｃ＿烷─Ｃ＿烷键的断裂。分子氢与ＰｈＣＨ＿反应，产生可夺取ＤＰＰ中ａ－亚甲基上的氢或附加在ＤＰＰ中苯环的ｉｐｓｏ位上游离氢原子；分子氢还可以还原作为ＤＰＰ分解产物的苯乙烯，从而防止其与ＰｈＣＨ＿２反应。由于这些作用，分子氢促进ＤＰＰ的分解反应。在加压氢气存在下添加二硫化铁进一步加速ＤＰＰ分解反应的进行，而添加超细铁粉抑制ＤＰＰ的分解反应。

effects of molecular hydrogen and catalysts on the decomposition of 1,3-diphenylpropane(DPP),used as a coal-related model compound,was investigated at 400℃.DPP decomposition proceeds via the cleavage of the C_(slk)─C_(alk) bond in DPP,which ismarkedly promoted by active radicals such as the resulting benzyl radicals(PHCH_2)fromDPP decomposition. The reaction of molecular hydrogen with PhCH_2 produces free hydro-gen atoms,which can abstract hydrogen from a-methylene group in DPP or add on the ipsoposition of benzene ring in DPP. In addition,molecular hydrogen prevents styrene,a decom-position product of DPP,from reacting with PhCH_2 by reducing styrene. Due to these roles,molecular hydrogen promotes DPP decomposition. Under pressurized hydrogen,the additionof FeS_2 further accelerates DPP decomposition, whereas the addition of ultra fine iron pow-der inhibits DPP decomposition.