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在工业烟气中  高氯代苯  当NH3-SCR反应与氯苯催化氧化共存时  （2）V2O5/TiO2催化剂催化氯苯的作用机理为：a氯苯发生亲核取代  b表面酚盐物种进一步氧化成邻苯二酚盐和对苯二酚盐物种  c苯二酚盐物种进一步氧化形成苯醌  d苯醌发生分解  （3）O2浓度提高有利于催化氧化反应的进行  向氯苯催化体系中引入NH3-SCR反应后  NH3与氯苯之间发生竞争吸附  氯苯  催化  SCR  机理  常见的氯代芳烃污染物有氯苯  多氯联苯和二恶英可归于持久性有机污染物（POPs）  探索了其影响氯苯催化反应的过程和机制。 本论文得出以下结论： （1）V2O5/TiO2催化剂对苯  在催化剂表面形成表面酚盐物种  即环状结构得到破坏形成马来酸  H2O的引入对催化反应有抑制作用  NO的存在对氯苯催化有促进作用  导致氯苯催化转化率下降。 本论文的研究工作为V2O5/TiO2催化剂在工业烟气催化降解氯代芳烃领域的应用提供了实验和理论依据。 关键词：V2O5/TiO2  氯酚  虽然含量低  苯酚  醋酸以及醛类物质  促进作用来源于NO与催化剂作用形成的表面NO2物种和硝酸盐物种  多氯联苯以及二恶英。其中  但毒性巨大  氯苯  并进一步氧化生成CO  但由于高温时催化剂表面硝酸盐物种减少使这种促进作用变得微弱  氯苯  严重危害人体健康  1  CO2  1  污染生态环境。 催化氧化法是去除工业烟气中氯代芳烃污染最为有效的方法之一。本文使用V2O5/TiO2催化剂  3-二氯苯和1  H2O和HCl最终完成氯苯的催化氧化过程  2二氯苯和1  针对苯  3  3-二氯苯符合挥发性有机化合物（VOCs）的定义  苯酚  5-三氯苯催化氧化机制是类似的  具有很强的挥发性  氯苯  Cl官能团数量增加  1  催化反应活性降低  3-二氯苯  1  3  5-三氯苯进行了活性评价和原位红外研究  提出了氯代芳烃催化降解过程中的具体步骤  并对苯环上不同官能团以及Cl官能团数量对于催化过程的具体影响进行了探索。另外  研究了烟气中复杂组分对氯苯催化氧化过程的影响  

It is always the hot subject to realize the output of high-power laser in the range of 3-5m wavelength. This rang of wave band has greatly important applications in military because it located in the atmosphere window. Generally there are two ways to obtain this range of laser wavelength. One way is through optical parameter oscillation (OPO) from shorter laser wavelength and the other is through second harmonic generation (SHG) from longer laser wavelength. Firstly  the comparison between tow nonlinear crystals ZnGeP2 and AgGaSe2 is conducted for their nonlinear coefficient and damaging threshold in theory. The theoretical results show that the crystal AgGaSe 2 is more suitable for the SHG of pulsed TEA CO2 laser. When using pulsed TEA CO2 laser with wavelength of 9.3m to pumping AgGaSe2 SHG crystal  the wavelength of 4.65m is obtained. In the condition of repetition rate 100Hz  the upmost output power of single pulse is up to level of 1W  which corresponding efficiency of SHG is about 6%. The experimental results show that the polarization of laser beam has greatly influence on the SHG output of the crystal. Under the radiation of 3MW/cm 2 from fundamental wave and the right position for maximal SHG output in the crystal  when polarization of laser beam rotates 4.5  the SHG output of energy decrease about 30%. The research of this paper will make a foundation for further development of mid-infrared laser. 2010 Copyright SPIE - The International Society for Optical Engineering.  

Elevated O-3  Photosynthetic CO2 exchange  Chlorophyll a fluorescence  Leaf growth