NO reduction using low-temperature SCR assisted by a DBD method

This paper discusses the removal of nitric oxide(NO) with low-temperature selective catalytic reduction driven by a dielectric barrier discharge with ammonia(NH_3) as a reductant. We explored the effects of NH_3, O_2, temperature and water under different applied voltage on NO removal at atmospheric pressure. The results showed that when the gas concentration ration of NH_3/NO was 0.23–0.67, the NO removal efficiency and the energy consumption was acceptable. The NO removal efficiency reached 84% under an applied voltage of 7 kV, 400 ppm NO and 90 ppm NH_3 at a temperature of 150 ℃. Water vapor had a negative effect because NO formation reactions were strengthened and NH_3 was oxidized directly rather than reduced NO molecules. The outlet gas components were observed via Fourier transform infrared spectroscopy for revealing the decomposition process and mechanism.     

Destruction of H2S Gas with a Combined Plasma Photolysis（CPP） Reactor

A combined plasma photolysis(CPP) reactor that utilized the dielectric barrier discharge(DBD) plasma together with DBD-driven KrI excimer ultraviolet emission was applied to the decomposition of H 2 S gas.The effects of applied voltage,input current,gas flow velocity,original concentration as well as the ratio of Kr/I 2 mixture on H 2 S removal efficiency were investigated.Gas streams containing H 2 S were separately treated with single DBD and CPP reactor under the same conditions.In comparison to DBD,CPP could greatly enhance the H 2 S removal efficiency at the same applied voltage,inlet gas concentration and gas flow velocity.In addition,the reaction mechanism was also discussed in this paper.     

等离子体技术在环境保护中的应用（上）

介绍了等离子体的有关概念及其降解污染的基本原理,并分别阐述了高温等离子体和低温等离子体技术在环境污染治理中的应用研究,提出了今后的发展方向。     

电解法降解动物制药废水的研究

研究了电解法以及电解 -化学氧化相结合的方法对动物制药废水的降解情况。结果表明COD去除率随电解电压的上升、电解时间的增加而上升 ,随 p H值的增加而下降。加入氯酸钠后电解 ,COD去除率明显增加     

水解酸化—USFB—气浮—A~2/O处理木糖醇废水

某木糖醇生产企业其生产废水整体呈酸性,色度较高,大部分污染物是可溶性的,针对其水质特性,采用水解酸化-USFB-气浮-A2/O处理工艺.工程实践表明:该工艺具有有机物去除率高、耐冲击性强、运行简单等特点,出水达到<污水综合排放标准>(GB 8978-1996)二级标准.     

DBD coupled with MnOx/γ-Al2O3 catalysts for the degradation of chlorobenzene

This paper investigates the degradation of chlorobenzene by dielectric barrier discharge(DBD)coupled with MnOx/γ-Al2O3 catalysts.MnOx/γ-Al2O3 catalysts were prepared using the impregnation method and were characterized in detail by N2 adsorption/desorption,x-ray diffraction and x-ray photoelectron spectroscopy.Compared with the single DBD reactor,the coupled reactor has a better performance on the removal rate of chlorobenzene,the selectivity of COx,and the inhibition of ozone production,especially at low discharge voltages.The degradation rate of chlorobenzene and selectivity of COx can reach 96.3%and 53.0%,respectively,at the specific energy density of 1350 J l-1.Moreover,the ozone concentration produced by the discharge is significantly reduced because the MnOx/Al2O3 catalysts contribute to the decomposition of ozone to form oxygen atoms for the oxidation of chlorobenzene.In addition,based on analysis of the byproducts,the decomposition mechanism of chlorobenzene in the coupled reactor is also discussed.     

等离子体技术在环境保护中的应用(下)

介绍了等离子体的有关概念及其降解污染物的基本原理,并分别阐述了高温等离子体和低温等离子体技术在环境污染治理中的应用研究,提出了今后的发展方向。     

四腔统调滤波器设计报告

本文给出了一个S波段可调带通滤波器的全部设计过程。给出了每个实际尺寸的具体设计方法和步骤。对所做的滤波器进行了测试,实测结果和设计计算基本符合。     

CS自由基与O_2的反应产物COS的研究

以 CS2 和 O2 体系为研究对象 ,探讨 1 85 nm光照射下 CS自由基与 O2 反应产物 COS的生成机理 ,并讨论了光照时间、O2 的初始分压及外加 N2 对 COS的生成的影 .实验表明 ,O2 捕集 CS自由基后产生 COS和 O原子 ,抑制了 CS+ S→ 2 CS2 的反应 ,O原子又进一步消耗反应体系中的CS2 促进了 COS的产生 .     

非平衡态等离子体作用下一氧化碳的转化

利用介质阻挡放电产生的低温等离子体对流动态条件下一氧化碳进行了研究。研究结果表明 CO转化为 CO2 的转化率和电压呈单调递增的关系 ,和浓度呈单调递减的关系。同时研究表明纯Ar体系中水分子的存在有利于一氧化碳向二氧化碳的转化 ,在湿度为 1 0 0 %时转化率可以高达75 .79% ,并对此进行理论探讨。