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High Voltage 2018年第1期3卷 60-66页

作者： Apeksha Madhukar bangalore s.rajanikanth Electrical Department Indian Institute of Science BangaloreIndia

With the advent of non-thermal plasma technique for diesel exhaust treatment attention is being focused on reducing oxides of nitrogen(NO_(x))both from stationary as well as automobile *** this work,an attempt has been made to enhance NO_(x) reduction only by utilising a plasma/ozone injection approach without resorting to additional treatments based on catalysts/*** was observed that cascading ozone injection with discharge plasma enhances the reduction of NO_(x) as high as 95%for the specific energy of 123 J/*** the long run,this plasma-only based approach may be beneficial or a possible alternative for catalyst/adsorbent based NO_(x) *** results have been discussed and a comparative analysis has been made with respect to individual plasma and ozone injection treatment.

关键词： adsorbent stationary catalyst

Plasma cascaded solid wastes for possible adsorption of NO_(2)in diesel exhaust

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Waste Disposal and sustainable Energy 2023年第3期5卷 383-393页

作者： Apoorva sahu shivani Mishra Preeti Jain bangalore s.rajanikanth Department of Electrical Engineering Indian Institute of ScienceBangaloreIndia Department of Electrical Engineering Jabalpur Engineering CollegeJabalpurIndia

Extensive use of fossil fuel has led to an increase in solid and gaseous particulates in the environment,which in turn necessitated newer,effective,and economical control strategies to abate pollutants,particularly gaseous *** the current research work,focus has been placed on utilizing industry wastes to adsorb nitrogen oxides present in diesel engine exhaust,which is pre-treated by *** exhaust from a 5 kW diesel generator is exposed to discharge plasma where the oxidation of nitric oxide to nitrogen dioxide occurs,which is then made to flow through another reactor filled with industry wastes drawn from agriculture,foundry,utility,marine industry,etc.,comprising mulberry waste,rice husk,wheat husk,areca nut husk,sugarcane bagasse,coffee husk,foundry sand,lignite ash,red mud,and oyster *** the adsorption of nitrogen dioxide was observed in all the wastes,reduction of nitric oxide was observed in metallic compound-based industry *** about 184 J/L,specific energy plasma cascaded industrial waste red mud yielded 98%NO_(x)removal efficiency,and that with agriculture rice husk waste yielded 53%NOx ***_(2)/Fe_(2)O_(3)present in industry wastes might have exhibited photo-catalysis in visible light resulting in the possible reduction of NO.A new pathway for recycling the waste can be expected through nitrogen dioxide adsorption,and the results are further discussed with respect to plasma-alone and cascaded plasma adsorbent systems.

关键词： Industry waste Electrical discharge Diesel exhaust Nitrogen oxide reduction Agriculture waste Plasma adsorption

study of Pulsed Plasma in a Crossed Flow Dielectric Barrier Discharge Reactor for Improvement of NO_x Removal in Raw Diesel Engine Exhaust

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Plasma science and Technology 2011年第1期13卷 82-87页

作者： sankarsan MOHAPATRO B.s.rajanikanth High Voltage Lab Indian Institute of Science

Improved performance of plasma in raw engine exhaust treatment is reported. A new type of reactor referred to as of cross-flow dielectric barrier discharge （DBD） was used, in which the gas flow is perpendicular to the corona electrode. In raw exhaust environment, the cross-flow （radial-flow） reactor exhibits a superior performance with regard to NOx removal when compared to that with axial flow of gas. Experiments were conducted at different flow rates ranging from 2 L/min to 25 L/min. The plasma assisted barrier discharge reactor has shown encouraging results in NOx removal at high flow rates.

关键词： electric discharges NOx removal, non-thermal plasma, raw diesel engine exhaust

Removal of Nitrogen Oxides in Diesel Engine Exhaust by Plasma Assisted Molecular sieves

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Plasma science and Technology 2002年第4期4卷 1399-1406页

作者： B s.rajanikanth, V RaviDept. of High Voltage Engineering, Indian Institute of science, bangalore 560012,INDIA Dept. of High Voltage Engineering Indian Institute of Science Bangalore 560012 INDIA

This paper reports the studies conducted on removal of oxides ofnitrogen (NOx) from diesel engine exhaust using electrical dischargeplasma combined with adsorbing materials such as molecular *** study is being reported for the first time. The exhaust is takenfrom a diesel engine of 6 kW under no load conditions. Thecharacteristic behavior of a pulse energized dielectric barrierdischarge reactor in the diesel exhaust treatment is reported. TheNOx removal was not significant (36/100) when the reactor without anypacking was used.

关键词： diesel engine exhaust nitrogen oxides removal electrical discharge plasma

Achieving Better NO_x Removal in Discharge Plasma Reactor by Field Enhancement

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Plasma science and Technology 2008年第2期10卷 198-202页

作者： B.s.rajanikanth Dipanwita sINHA High Voltage Laboratory Deptartment of Electrical Engineering Indian Institute of Science Bangalore 560012 India

Application of plasma chemistry for gas cleaning is gaining prominence in recent years, mainly from an energy efficiency point of view. In this paper we conducted a comparative study of NO/NOx removal using two different types of dielectric barrier discharge electrodes, wire- cylinder reactor, pipe-cylinder reactor. Investigations were first carried out with synthetic gases to obtain the baseline information on the NO/NOx removal with respect to the two geometries studied. Further, experiments were carried out with raw diesel exhaust under loaded condition. A high NOx removal efficiency of 90% was observed for the pipe-cylinder reactor as compared to that of 53.4% for the wire-cylinder reactor. Furthermore, for the same energy consumed per NO molecule （about 73 eV/NO molecule）, the removal efficiency increased from 67% for the wire- cylinder to about 98% for the pipe-cylinder which was quite appreciable.

关键词： NOx removal engine exhaust plasma treatment barrier discharge electrodes

DeNOx study in Diesel Engine Exhaust Using Barrier Discharge Corona Assisted by V_2O_5/TiO_2 Catalyst

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Plasma science and Technology 2004年第4期6卷 2411-2415页

作者： B.s.rajanikanth V.Ravi Indian Institute of science Bangalore 560012IndiaIndian Institute of ScienceBangalore 560012India

A plasma-assisted catalytic reactor was used to remove nitrogen oxides (NOx)from diesel engine exhaust operated under different load conditions. Initial studies were focused onplasma reactor (a dielectric barrier discharge reactor) treatment of diesel exhaust at varioustemperatures. The nitric oxide (NO) removal efficiency was lowered when high temperature exhaust wastreated using plasma reactor. Also, NO removal efficiency decreased when 45% load exhaust wastreated. studies were then made with plasma reactor combined with a catalytic reactor consisting ofa selective catalytic reduction (sCR) catalyst, V_2O_5/TiO_2. Ammonia was used as a reducing agentfor sCR process in a ratio of 1:1 to NOx. The studies were focused on temperatures of the sCRcatalytic reactor below 200℃. The plasma-assisted catalytic reactor was operated well to remove NOxunder no-load and load conditions. For an energy input of 96 J/l, the NOx removal efficienciesobtained under no-load and load conditions were 90% and 72% respectively at an exhaust temperatureof 100 ℃.

关键词： non-thermal plasma DeNOx barrier discharge diesel exhaust

Discharge Plasma Assisted Adsorbents for Exhaust Treatment: A Comparative Analysis on Enhancing NO_x Removal

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Plasma science and Technology 2008年第3期10卷 307-312页

作者： B.s.rajanikanth Dipanwita sINHA P.EMMANUEL Department of High Voltage Engineering Indian Institute of Science Bangalore 560012 India

An analysis has been made on the discharge plasma coupled with an adsorbent system for NOx removal. The cascaded plasma-adsorbent system may be perceived as a better alternative for the existing adsorbent-based abatement system in the industry. In this study the exhaust is sourced from a diesel generator set. It was observed that better NO removal in a plasma reactor can be made possible by achieving higher average fields and subsequent NO2 removal can be improved using an adsorbent system connected in cascade with the plasma system. The paper describes various findings pertaining to these comparative analyses.

关键词： NOx removal engine exhaust discharge plasma plasma-adsorbent non- thermal plasma

Enhanced Performance of Discharge Plasma in Raw Engine Exhaust Treatment-Operation under Different Temperatures and Loads

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Plasma science and Technology 2005年第4期7卷 2943-2946页

作者： B s.rajanikanth A D srinivasan subhankar das Dept.of High Voltage Engineering Indian Institute of science Bangalore 560012IndiaDept.of High Voltage Engineering Indian Institute of ScienceBangalore 560012IndiaDept.of High Voltage Engineering Indian Institute of ScienceBangalore 560012India

This paper reports improved performance of discharge plasma in raw engine exhaust treatment. For the purpose of investigation, both filtered and raw diesel engine exhaust were separately treated by the discharge plasma. In raw exhaust environment, the discharge plasma exhibits a superior performance with regard to NOx removal, energy consmnption and formation of by-products. In this study, experiments were conducted at conditions of different temperatures and loads.

关键词： raw diesel engine exhaust discharge plasma NOx removal

Injection of N-Radicals into Diesel Engine Exhaust Treated by Plasma for Improved NO_x Removal: A Feasibility study

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Plasma science and Technology 2006年第2期8卷 202-206页

作者： B. s. rajanikanth B. R. sUsHMA Dept. of High Voltage Engineering Indian Institute of Science Bangalore 560012 India

Reported in this paper is a feasibility study on the injection of plasma induced N radicals for the abatement of NO and NOx present in the actual diesel exhaust. The radical laden diesel exhaust was further treated by discharge plasma in a dielectric barrier discharge reactor. N radicals were produced in a separate plasma reactor filled with BaTiO3 pellets and were then injected into the treatment zone, There was a significant improvement in the efficiency when the radicals were injected compared to that when there was no radical injection. The efficiency of NOx removal at 0 load with plasma alone was 14% whereas with the injection of N radicals it went up to 38%, The results of the experiments conducted at different loads are discussed,

关键词： N-radical diesel engine exhaust NOx removal plasma treatment

A Cascaded Discharge plasma—Adsorbent Technique for Engine Exhaust Treatment

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Plasma science and Technology 2003年第3期5卷 1825-1833页

作者： B.s.rajanikanth A.D.srinivasan B.AryaNandiny DeptofHighVoltageEngineering IndianInstituteofScienceBangalore560012India

A cascaded system of electrical discharges (non-thermal plasma) andadsorption process was investigated for the removal of oxides of Nitrogen (NO_x) and totalhydrocarbons (THC) from an actual diesel engine exhaust. The non-thermal plasma and adsorptionprocesses were separately studied first and then the cascaded process was studied. In this study,different types of adsorbents were used. The NO_x removal efficiency was higher withplasma-associated adsorption (cascaded) process compared to the individual processes and the removalefficiency was found almost invariant in time. When associated by plasma, among the adsorbentsstudied, activated charcoal and Ms-13X were more effective for NO_x and THC removal *** experiments were conducted at no load and at 50 % load conditions. The plasma reactor was keptat room temperature throughout the experiment, while the temperature of the adsorbent reactor wasvaried. A relative comparison of adsorbents was discussed at the end.

关键词： discharge plasma engine exhaust adsorbent non-thermal plasma