Determination of gas-phase ozonolysis rate coefficients of a number of sesquiterpenes at elevated temperatures using the relative rate method.

Determination of gas-phase ozonolysis rate coefficients of a number of sesquiterpenes at elevated temperatures using the relative rate method.
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使用相对速率法测定高温下多种倍半萜烯的气相臭氧分解速率系数。

DOI:
10.1039/c2cp23988d
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发表时间:
2012
期刊:
PCCP
影响因子:
--
通讯作者:
Ghalaieny M
Ghalaieny M
中科院分区:
--
文献类型:
--
作者:
Ghalaieny M

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四种倍半萜,β-石竹烯,α-葎草烯,异长叶烯和α-雪松烯,在366±3k的高温和~ 780 Torr的压力下,气相中使用EXTRA测定臭氧分解速率。实验得到的异长叶烯和α-雪松烯的速率系数与外推的室温速率系数一致,但β-石竹烯和α-葎草烯的速率系数不一致,它们的速率比文献中慢3个数量级。这些新的测量支持了在环境条件下操作的假设,可冷凝物质的动力学测量可能受到异质过程的不利影响,因此应谨慎对待。
The rates of ozonolysis of four sesquiterpenes, β-caryophyllene, α-humulene, isolongifolene and α-cedrene, are determined in the gas phase at an elevated temperature of 366 ± 3 K and a pressure of ∼780 Torr using the EXTreme RAnge chamber (EXTRA). The experimentally obtained rate coefficients agree with extrapolated room temperature rate coefficients for isolongifolene and α-cedrene but not for β-caryophyllene and α-humulene, which were found to be three orders of magnitude slower than this in the literature. These new measurements support the hypothesis that operating under ambient conditions, kinetic measurements of condensable species can be influenced adversely by heterogeneous processes and should therefore be treated with caution.
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