利用衝擊波管研究O(3P)+C2H5OH高溫的反應速率常數及其反應機制

Abstract

我們利用活塞型衝擊波管-原子共振吸收光譜系統測量 C2H5OH+O(3P)反應之反應速率常數，並利用模型適解法(modeling fit method)求得此反應在782-1410 K的速率常數。結果為k (T) = (1.10 0.26)×10-15T1.44exp[-(1537 1112)/T] cm3molecule-1s-1所列之誤差為最佳適解的標準差。本次實驗的結果與林明璋研究組所提供的理論計算結果較為一致。而經由數據上的分析，可以發現在我們的反應機制模型中，最主要的二次反應為CH3CHOH+O→CH2O+OH，但是在高溫中，最主要的二次反應則為O + CH3 → CH2O + H。

Rate coefficients of the reaction O(3P) + C2H5OH in the high temperature are determined using a diaphragmless shock tube. O(3P) atoms are generated by photolysis of SO2 with an ArF (193 nm) excimer laser; its concentration is monitored with atomic resonance absorption spectroscopy (ARAS). We model observed temporal profiles of [O] with reactions using a commercial kinetic modeling program FACSIMILE. Rate coefficient of the reactions is varied to yield the best fit for temporal profiles of [O]. We report rate measurements of the title reaction in the temperature range 782-1410K.