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High-Sensitivity In-Situ Diagnosis of NO_2 Production and removal in DBD Using Cavity Ring-Down Spectroscopy

Plasma Science and Technology 2014年第2期16卷 142-148页

作者：吴兴伟李聪张辰飞丁洪斌 Key Laboratory of Materials Modification by Laser Ion and Electron BeamsChinese Ministry of EducationSchool of Physics and Optical Electronic TechnologyDalian University of Technology

A highly-sensitive in-situ diagnosis approach for nitrogen dioxide （no2） has been developed in dielectric barrier discharge （DBD） based on pulsed cavity ring-down spectroscopy （CRDS）. Absorption bands of no2 in a spectral region from 508 nm to 509 nm were used, and a detection limit of 17.5 ppb was achieved. At this level of sensitivity, the quantitative and real-time monitoring of the production and removal of no2 are accomplished for the first time in the discharge region. By measuring the removal amount and rate at different no2 initial number densities from 1.54 ×10^13 cm^-3 to 2.79 × 10^14 cm^-3, we determined the relationship between them and no2 initial number densities. The removal amount linearly increases with the initial number density, while the removal rate increases logarithmically. At a lower initial number density, the removal rate is limited. By considering the chemical kinetic mechanism in plasma, a qualitative explanation for the above phenomena is proposed： the additional no2 produced by discharge limits the removal rate, since the no2 concentration is dominated by the competition between the forward reactions （production） and the reverse reactions （removal）.

关键词： DBD CRDS no2 production no2 removal

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Superior Storage Performance for NO in Modified Natural Mordenite

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Chinese Journal of Chemistry 2012年第7期30卷 1511-1516页

作者：王卉于琴琴肖丽萍刘彤于万金蒋晓原张旭鸣郑小明 Key Lab of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhouZhejing 310028China Hangzhou Kaiming Catalysis Co. HangzhouZhej iang 310023China

Natural mordenite （NMOR）, modified by acid treatment and ion-exchange, was employed for NO adsorption in the present study. The NO storage capacity of modified NMOR was greatly improved compared with its original correspondents, mainly due to the preservation of crystalline structure and the improvement of surface area of NMOR. Among all the modified NMOR, Ni-NMOR exhibited the highest adsorption capacity for NO （1.20 mmol-g^ 1） in the presence of 10% 02 at 308 K. The influence of the main ingredients in flue gas on the storage capacity of NMOR for NO had also been investigated. In general, H2O, CO2 and SO2 all displayed negative impact on NO adsorption due to their competitive adsorption on the surface of NMOR with NO, while the presence of 02 greatly improved the adsorption of NO because of the formation of no2 and N203. Moreover, Ni-NMOR exhibited high efficiency for NOx removal through the NOx adsorption-plasma discharge process.

关键词： natural mordenite NOx adsorption flue gas no2 removal

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