The decomposition of toluene (a model tar compound) in CO₂ was investigated at ambient and elevated temperatures in a dielectric barrier discharge (DBD). The effects of reaction parameters, such as the residence time (0.47–4.23 s), plasma power (5–40 W), toluene concentration (20–82 g/Nm³), and temperature (20–400 °C), were investigated. The DBD was shown to be an effective technique for tar removal. The percentage removal of tar increased with increasing the plasma power and residence time (to as high as 99% at the residence time of 4.23 s). The maximum selectivity to the two major gaseous products, CO and H₂, was 73.5 and 21.9%, respectively. Solid residue formation was also observed inside the reactor. The synergetic effect of the temperature and plasma power was studied. As temperature increased, the decomposition of toluene decreased slightly from 99 to 88% (from ambient to 400 °C at 40 W) and the selectivity of CO and H₂ decreased as a result of the increased rate of recombination of CO and O. The selectivity to lower hydrocarbons increased with the temperature.

中文翻译：

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CO ₂在非热等离子体介电阻挡放电反应器中作为焦油替代品的甲苯转化中的作用

在环境温度和高温下，通过介电势垒放电（DBD）研究了甲苯（一种典型的焦油化合物）在CO ₂中的分解。反应参数的影响为：停留时间（0.47–4.23 s），等离子体功率（5–40 W），甲苯浓度（20–82 g / Nm ³）和温度（20–400°C）。调查。DBD被证明是一种有效的去除焦油的技术。焦油的去除百分比随着等离子体功率和停留时间的增加而增加（在停留时间为4.23 s时高达99％）。对两种主要气态产物CO和H ₂的最大选择性分别为73.5和21.9％。在反应器内部也观察到了固体残留物的形成。研究了温度和等离子体功率的协同效应。随着温度的升高，甲苯的分解率从99％降至88％（在40 W下从环境温度降至400°C），并且CO和H ₂的选择性由于CO和O的重组率增加而降低。随着温度的升高，对低级烃的选择性增加。