Pyrolysis of chlorophyll a after preliminary heating at a moderate temperature: Implications for the origin of prist-1-ene on kerogen pyrolysis
Pyrolysis of chlorophyll a after preliminary heating at a moderate temperature: Implications for the origin of prist-1-ene on kerogen pyrolysis
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中等温度预加热后叶绿素 a 的热解：prist-1-ene 来源对干酪根热解的影响
DOI：
10.1016/0165-2370(91)87002-4
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发表时间：
1991
影响因子：
6
通讯作者：
H. Tominaga
中科院分区：
文献类型：
--
作者：
M. Ishiwatari;R. Ishiwatari;Haru Sakashita;T. Tatsumi;H. Tominaga
利用叶绿素a的热解探针研究了干酪根热解产物中经常观察到的Prist-1-烯的可能前体和形成机理。通过在250℃下预热不同时间的叶绿素a来模拟热成熟，未加热或短暂预热的样品中的热解产物以植二烯为主。1 S在400℃下未加热的氯化吡喃a裂解生成少量的Prist-1-烯，而预热后得到相当大的产率。S在470℃下热解未加热和预热的叶绿素a生成Prist-1-烯。Prist-1-ene的产率相对于植二烯的产率随着预热时间的延长而增加。叶绿素a的裂解生成了额外的类异戊二烯碳氢化合物(C9、、C20)。对这些结果提出了可能的热解机理。
Pyroprobe pyrolyses of chlorophyll a were performed to investigate the possible precursors and formation mechanisms of prist-1-ene often observed in the products of kerogen pyrolysis. Thermal maturation was simulated by preheating chlorophyll a for different times at 250°C. Phytadienes dominated the pyrolyzates from unheated or briefly preheated samples. Little prist-1-ene was produced from unheated chloropyll a during pyrolysis at 400°C for 1 s, whereas a considerable yield was obtained after preheating. Pyrolysis at 470°C for 15 s produced prist-1-ene from both unheated and preheated chlorophyll a. The yield of prist-1-ene increased with the time of preheating, relative to the yield of phytadienes. Additional isoprenoid hydrocarbons (C9C20) were formed from the fragmentation of chlorophyll a. Possible pyrolysis mechanisms to explain these results are presented.