论文部分内容阅读
Hydrogen peroxide(H2O2)has many uses in advanced oxidation water and wastewater treatment as well as in the disinfection of liquids and solid surfaces.The current industrial process to make H2O2 is based upon the anthraquinone process which utilizes hydrogen(H2)from natural gas(CH4)to hydrogenate anthraquinone followed by oxidation with oxygen from air.While this process is very successful for large scale production(>1000metric tons per year),it is not suitable for smaller scale applications,and the utilization of natural gas leads to significant CO2 formation.Plasma and electrochemical methods have been demonstrated to produce H2O2 from liquid water.Based upon extensive review of the literature,it has been found that the best plasma process for producing H2O2 directly from water utilizes a pulsed plasma gliding arc reactor with liquid spray.This method has a major advantage over other chemical methods because only pure water and carrier gas are required in the feed.The high solubility of H2O2 in the liquid droplets leads to rapid transfer of the plasma-formed products into the liquid phase,whereby they are protected from plasma degradation reactions and where they accumulate in significant amounts.The water droplets also provide a significant source of the needed water reactant into the plasma.The relatively low plasma and thermal reactor temperatures dramatically enhance the efficiency for generation of H2O2.In all cases,the small liquid droplets lead to high efficiency due to rapid rates of mass transfer and large surface area contact with the surrounding plasma and gas phase.In this talk,we will discuss the current status and challenges of this technology.