High-efficiency plasma catalytic removal of dilute benzene from air
High-efficiency plasma catalytic removal of dilute benzene from air
复制标题
高效等离子体催化去除空气中的稀苯
DOI：
10.1088/0022-3727/42/22/225105
复制
发表时间：
2009-11-21
影响因子：
3.4
通讯作者：
Zhu, Ai-Min
中科院分区：
文献类型：
--
作者：
Fan, Hong-Yu;Shi, Chuan;Zhu, Ai-Min
实现完全氧化、良好的耐湿性和低能耗是等离子体催化去除空气中挥发性有机物需要解决的关键问题。为此，Ag/HZSM-5催化剂填充的介质阻挡放电使用的循环系统组成的存储阶段和放电阶段进行了研究。Ag/HZSM-5催化剂对模拟空气中的苯具有较好的吸附性能，在储存阶段，吸附的苯被优先吸附，在排放阶段，吸附的苯几乎被完全氧化。五个“存储-放电”循环进行了检查，这表明Ag/HZSM-5催化剂是非常稳定的循环“存储-放电”（CSD）等离子体催化过程中。在适当的放电功率下，可实现较高的苯氧化率和较低的能耗。在一个CSD等离子体催化修复的例子中，在50%RH和600 ml min−1流速下，含有4.7 ppm苯的模拟空气的能量成本低至3.7 × 10−3 kWh m−3空气。这种从空气中去除低浓度污染物的极低能量成本无疑使等离子体催化技术的环境应用变得实用。
Achieving complete oxidation, good humidity tolerance and low energy cost is the key issue that needs to be addressed in plasma catalytic volatile organic compounds removal from air. For this purpose, Ag/HZSM-5 catalyst-packed dielectric barrier discharge using a cycled system composed of a storage stage and a discharge stage was studied. For dilute benzene removal from simulated air, Ag/HZSM-5 catalysts exhibit not only preferential adsorption of benzene in humid air at the storage stage but also almost complete oxidation of adsorbed benzene at the discharge stage. Five ‘storage–discharge’ cycles were examined, which suggests that Ag/HZSM-5 catalysts are very stable during the cycled ‘storage–discharge’ (CSD) plasma catalytic process. High oxidation rate of absorbed benzene as well as low energy cost can be achieved at a moderate discharge power. In an example of the CSD plasma catalytic remedy of simulated air containing 4.7 ppm benzene with 50% RH and 600 ml min−1 flow rate, the energy cost was as low as 3.7 × 10−3 kWh m−3 air. This extremely low energy cost to remove low-concentration pollutants from air undoubtedly makes the environmental applications of the plasma catalytic technique practical.