滑动弧放电等离子体法用于二甲醚重整制氢简

Gliding arc gas discharge plasma was used for the generation of hydrogen from steam reforming of dimethyl ether （DME）. A systemic procedure was employed to determine the suitable experimental conditions. It was found that DME conversion first increased up to the maximum and then decreased slightly with the increase of added water and air. The increase of total feed gas flow rate resulted in the decrease of DME conversion and hydrogen yield, but hydrogen energy consumption dropped down to the lowest as total feed gas flow rate increased to 76 ml. min^-1. Larger electrode gap and higher discharge voltage were advantageous. Electrode shape had an important effect on the conversion of DME and production of H2- Among the five electrodes, electrode 2# with valid length of 55 mm and the radian of 34 degrees of the top electrode section was the best option, which enhanced obviously the conversion of DME.     

插层膨润土负载掺铁TiO_2光催化剂的制备及其对亚甲基蓝的光降解

采用溶胶-凝胶法制备了具有高活性的可见光响应插层膨润土负载掺铁TiO2光催化剂(以下简称光催化剂),利用IR、XRD对光催化剂的组织构造和微观结构进行表征,并以亚甲基蓝为目标降解物,讨论了光催化剂在可见光下的催化活性。结果表明:掺铁TiO2成功负载于插层膨润土片层表面,当有机土和掺铁TiO2的配比为2∶1,烘干温度为80℃,焙烧温度为300℃,所制得光催化剂在可见光下,对pH值为4的亚甲基蓝废水溶液50min的降解率可达99.6%。     

Conversion of Methane to C2 Hydrocarbons and Hydrogen Using a Gliding Arc Reactor

Methane conversion has been studied using gliding arc plasma in the presence of argon.The process was conducted at atmospheric pressure and ambient temperature.The focus of this research was to develop a process of converting methane to C2 hydrocarbons and hydrogen. The main parameters,including the CH4/Ar mole ratio,the CH4 flow rate,the input voltage,and the minimum electrode gap,were varied to investigate their effects on methane conversion rate, product distribution,energy consumption,carbon deposit,and reaction stability.The specific energy requirement(SER) was used to express the energy utilization efficiency of the process and provided a practical guidance for optimizing reaction conditions for improving energy efficiency. It was found that the carbon deposition was not conducive to methane conversion,and the gliding arc plasma discharge reached a stable state twelve minutes later.Optimum conditions for methane conversion were suggested.The maximum methane conversion rate of 43.39%was obtained under the optimum conditions.Also,C2 hydrocarbons selectivity,C2 hydrocarbons yield,H2 selectivity, H2 yield and SER were 87.20%,37.83%,81.28%,35.27%,and 2.09 MJ/mol,respectively.     

滑动弧等离子体分解二甲醚制氢

对常温常压下滑动弧等离子体放电分解二甲醚(DME)制氢进行了研究,探讨了进气流量、电极间距、放电电压、电极形状和水/DME摩尔比以及添加的空气量对滑动弧等离子体DME转化制氢的影响。结果表明,当进气流量由43 mL·min-1增加到76 mL·min-1时,DME转化率从58.9%下降至50.6%,H2收率从26.9%下降至19.7%。随着电极间距由2 mm增加到4 mm、放电电压由11.2 kV增加到17.1kV时,DME转化率和H2收率增加,制氢能耗降低。电极最宽处有5mm平滑的竖直部分、上端电极长度50 mm,弧度23o的2#电极对DME放电反应最有利;添加水蒸汽和适量的空气对DME分解制氢反应有利,当水/DME摩尔比为2.3,添加空气的体积分数为25.8%时,DME转化率最大为74.1%,氢气的收率最大为43.4%。