The influence of reaction temperature on the oscillatory behaviour in the palladium-catalysed phenylacetylene oxidative carbonylation reaction
The influence of reaction temperature on the oscillatory behaviour in the palladium-catalysed phenylacetylene oxidative carbonylation reaction
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DOI：
10.1039/b905444h
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发表时间：
2009-01-01
影响因子：
3.3
通讯作者：
Scott, Steve
中科院分区：
文献类型：
--
作者：
Novakovic, Katarina;Mukherjee, Ankur;Scott, Steve
本文报道了在PdI2，KI，Air，NaOAc催化体系中，钯催化的苯乙炔在甲醇中的氧化羰基化反应中，反应温度对pH振荡的发生和特征的影响。在10-50℃的温度范围内进行了等温实验。实验表明，振荡发生在10-40℃的范围内，反应温度的降低导致pH振荡的周期和幅度增加。此外，观察到在任何特定温度下的振荡过程中，pH从最小值增加到最大值所需的时间随反应时间的不同而不同。然而，pH从最大值下降到新的最小值所需的时间相对于反应时间近似恒定，并且是反应温度的函数。
This paper reports the influence of reaction temperature on the occurrence and characteristics of pH oscillations that are observed during the palladium-catalysed phenylacetylene oxidative carbonylation reaction in a catalytic system (PdI2, KI, air, NaOAc) in methanol. Isothermal experiments were performed over the temperature range 10-50 degrees C. The experiments demonstrate that oscillations occur in the range 10-40 degrees C and that a decrease in reaction temperature results in an increase in the period and amplitude of the pH oscillations. Furthermore, it is observed that during oscillations at any specific temperature, the time taken for pH to increase from a minimum to a maximum value varies with respect to reaction time. However, the time required for the pH to fall from maximum to new minimum is approximately constant with respect to the reaction time and is a function of the reaction temperature.