Abstract

The effect of negative corona discharge plasma on the rate of the photocatalytic oxidation (PCO) of acetone and benzene vapors is explored via an in situ IR spectroscopic study of the dynamics of the change in the composition of a gas–vapor system in a 404-L static reactor. The photocatalyst is Hombifine N titanium dioxide, exposed to the light of UV lamps at a wavelength of λ = 365 nm. The rate of the PCO of substrate vapor is compared to those of oxidation in corona discharge plasma, of dark oxidation by ozone (a byproduct of a discharge), of PCO in the presence of ozone, and of PCO upon simultaneous treatment of the medium by corona discharge plasma. It is shown that the rates of oxidation of different substrates, both in plasma alone and in an ozone-containing atmosphere, are much lower than that of PCO. In a corona discharge, however, the rate of PCO increases along with that of the oxidation in an ozone-containing atmosphere. Considerable accumulation of ozone in a gas mixture upon exposure to a discharge is detected only after 80–90% of the oxidized substrate is consumed. The order of the PCO of acetone with respect to ozone is determined. It is shown that plasma treatment substantially accelerates the PCO of benzene by greatly reducing the deactivation of the photocatalyst observed in the PCO of benzene without plasma.

中文翻译：

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电晕放电等离子体和臭氧对丙酮和苯蒸气光催化氧化速率的影响

摘要

通过原位红外光谱研究了404气相中气体-蒸气系统组成变化的动力学，探索了负电晕放电等离子体对丙酮和苯蒸气的光催化氧化（PCO）速率的影响。 l静态电抗器。光催化剂是Hombifine N二氧化钛，在λ= 365 nm的波长下暴露于紫外线灯下。将基质蒸气的PCO速率与电晕放电等离子体中的氧化速率，臭氧（放电的副产物）的暗氧化速率，在臭氧存在下的PCO速率以及通过同时处理介质的PCO速率进行比较。电晕放电等离子体。结果表明，仅在等离子体中和在含臭氧的气氛中，不同基质的氧化速率均远低于PCO。但是在电晕放电中 在含臭氧的气氛中，PCO的速率随氧化速率的增加而增加。仅在消耗了80-90％的氧化底物后，才检测到混合气体中臭氧在气体混合物中的大量积累。确定丙酮的PCO相对于臭氧的顺序。结果表明，等离子体处理通过大大减少在无等离子体的苯的PCO中观察到的光催化剂的失活，从而大大促进了苯的PCO。