Graduate Institute of Environmental Engineering, National Central University, No.300, Zhongda Road, Zhongli District, Taoyuan City, 32001, Taiwan.
Green Energy and Environmental Institute, Industrial Technology Research Institute, Hsinchu, Taiwan.
Environ Sci Pollut Res Int. 2021 Nov;28(41):57619-57628. doi: 10.1007/s11356-021-14649-0. Epub 2021 Jun 5.
Octafluorocyclobutane (CF) with a GWP (global warming potential) of 10,000 times of CO is listed as potent greenhouse gas. Therefore, development of effective control technologies for reducing CF emissions has become an emerging issue to be addressed. In this study, decomposition of CF was investigated via three systems including catalytic hydrolysis, non-thermal plasma, and plasma catalysis, respectively. Decomposition of CF achieved with catalytic hydrolysis reaches the highest efficiency of 20.1%, being obtained with γ-AlO as catalyst in the presence of 10% HO and operating temperature of 800 °C. For plasma-based system, the highest CF conversion obtained with non-thermal plasma is 62% at a voltage of 23 kV. As for the plasma catalysis system, 100% CF conversion efficiency can be achieved at an applied voltage of 22-23 kV. The effects of various parameters such as gas flow rate and CF concentration on plasma-based system show that the plasma catalysis also has better resistivity for the high gas flow rate. The highest energy efficiency of 0.75 g/kWh is obtained for the gas flow rate of 500 mL/min, with the CF conversion of 41%. The highest conversion 89% was achieved with the O content of 0.5%. Addition of Ar improves the performance of plasma-based system. When Ar is controlled at 20%, CF conversions obtained with plasma catalysis reach 100% at applied voltage of 22-23 kV even in the presence of 5% O. The main products of the CF conversion include CO, NO, and COF when O is added into the system. As water vapor is added, HF is also formed. This study has confirmed that combined non-thermal plasma with catalyst system to convert CF is indeed feasible and has good potential for further development.
八氟环丁烷（CF）的全球变暖潜能值（GWP）为 10000 倍的 CO，被列为强效温室气体。因此，开发有效的控制技术来减少 CF 排放已成为一个新兴的待解决问题。在这项研究中，分别通过催化水解、非热等离子体和等离子体催化三种系统来研究 CF 的分解。在有 10%HO 和 800°C 操作温度的情况下，以γ-AlO 为催化剂，CF 通过催化水解的分解达到了最高的 20.1%的效率。对于基于等离子体的系统，在 23kV 的电压下，CF 的最高转化率为 62%。对于等离子体催化系统，在 22-23kV 的应用电压下可以实现 100%的 CF 转化率效率。各种参数（如气体流速和 CF 浓度）对基于等离子体的系统的影响表明，等离子体催化对高气速也具有更好的电阻。在气体流速为 500mL/min 时，CF 转化率为 41%，获得了最高的能量效率 0.75g/kWh。当 O 含量为 0.5%时，获得了最高的转化率 89%。添加 Ar 可提高基于等离子体的系统的性能。当 Ar 控制在 20%时，即使在存在 5%O 的情况下，CF 转化率也可以在 22-23kV 的应用电压下通过等离子体催化达到 100%。CF 转化的主要产物包括当系统中添加 O 时的 CO、NO 和 COF。当添加水蒸气时，也会形成 HF。本研究证实了将非热等离子体与催化剂系统相结合来转化 CF 确实是可行的，并且具有进一步发展的良好潜力。
