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Removal NO with non-thermal plasma Assisted Catalyst Modified Activated Carbon from Coal

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Removal NO with Non-thermal Plasma Assisted Catalyst Modifie...

Kinetics Analysis of Decomposing Tributylphosphate with non-thermal plasma

The 3rd International Conference on Environmental Technology and Knowledge Transfer

作者： YAN Lingyan CHEN Minggong ZHANG Xinmin LIU Tao QI Yongtao CHEN Mingqiang LIAO Xia CUI Can CHEN Jing.(School of Chemical Engineering Anhui University of Science and Technology Huainan 232001 China)

non-thermal plasma assisted with catalysts is one effective way of removing NOx.The catalyst,which modified activated carbon from coal,combined with non-thermal plasma was used in this study.The relationships among the input voltage,the NO initial concentration,the gas space velocity,the quantity of packed catalyst and NO removal ratio were investigated.The results showed that the NO removal ratio increased with the increasing of input voltage;with the NO initial concentration and the gas space velocity increasing the NO removal ratio increased and then decreased,there was a peak value of the removal ratio.The plasma associated with catalyst,glass beads and without catalyst had different effect on the NO removal ratio,the order of the ratio was as follows:plasma combined with catalyst＞plasma and glass beads＞only catalyst＞only plasma.The catalysts packed in the reactor not only had the function of catalysis,adsorption,storage,and also took on Barrier Dielectric for Discharge.In this experiment when the NO initial concentration was around 256ppm,the weight of catalyst 43.9g,the input voltage 25kV,the space velocity about 10.2s-1,the NO removal ratio reached 74%.

关键词： dielectric barrier discharge removal NOx catalyst non-thermal plasma automotive exhaust activated carbon from coal

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Kinetics Analysis of Decomposing Tributylphosphate with Non-...

Abatement of Dilute Toluene from Air Stream through a Two-Stage non-thermal plasma Catalysis System

The 2012 International Conference on Advanced Material and Manufacturing Science (ICAMMS 2012)

作者： Xinliang Wang Zhe Meng Fan Gu Wuhan 2nd Ship Design and Research Institute Hubei Academy of Scientific and Technical Information School of Energy Engineering and Environmental Engineering Southeast University

non-thermal plasma technique can be used to degrade radioactive liquid waste involving Tributylphosphate（TBP） producing in nuclear fuel reprocessing.The dissociation reaction caused by the collision of electrons with neutral molecules can generate active radicals which play a central role in removing TBP.And the electron reacting with vapor to generate OH radicals is the key reaction in removing TBP.A model is derived from the Boltzmann equation and molecule collision theory to predicate the dissociation reaction rate coefficients.Upon comparing with available literature,the model is confirmed to be acceptably accurate in general.Reaction rate coefficients of vapor dissociation in non-thermal plasma are derived according to the Arrhenius formula.

关键词： non-thermal plasma chemical reaction kinetics rate coefficient

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Abatement of Dilute Toluene from Air Stream through a Two-St...

Influence of electrical parameters on H2O2 generation in DBD non-thermal reactor with water mist

第十四届全国等离子体科学技术会议暨第五届中国电推进技术...

作者： X.Tang,W.Chen,X.Zhang,K.Yan~* Ins(?)itute of Environment Pollution Control Technology,College of Environmental and Resource Sciences, Zhejiang University,Hangzhou,310028,P.R.China

The removal of low concentration toluene from air stream by dielectric barrier discharge (DBD) serially combined with manganese oxide octahedral molecular sieve(OMS-2-type) catalytic post-treatment has been investigated in atmospheric pressure and room temperature plasma catalysis is found to be more effective at destroying toluene than both conventional thermal-catalysis and plasma alone.The toluene conversion was greatly enhanced by combining DBD with the OMS-2 in a two-stage configuration.The high concentrations of ozone produced in the discharge zone can be used to further oxidize toluene and residual pollutants on OMS-2 catalyst in the post-plasma.The efficient decomposition of O

关键词： non-thermal plasma VOCs OMS-2 Ozone

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plasma Science and Technology 2017年第6期19卷 26-32页

作者：徐迪肖泽铧郝春静邱剑刘克富 Institute of Light Sources and Illuminating Engineering Fudan University Shanghai 200433 People's Republic of China

A dielectric barrier discharge（DBD） reactor is introduced to generate H2O2 by non-thermal plasma with a mixture of oxygen and water mist produced by an ultrasonic atomizer.The results of our experiment show that the energy yield and concentration of the generated H2O2 in the pulsed discharge are much higher than that in AC discharge,due to its high energy efficiency and low heating effect.Micron-sized liquid droplets produced by an ultrasonic atomizer in water mist have large specific surface area,which greatly reduces mass transfer resistance between hydroxyl radicals and water liquids,leading to higher energy yield and H2O2 concentration than in our previous research.The influence of applied voltage,discharge frequency,and environmental temperature on the generated H2O2 is discussed in detail from the viewpoint of the DBD mechanism.The H2O2 concentration of 30 mg l^-1,with the energy yield of 2 gkW^-1h^-1 is obtained by pulsed discharge in our research.

关键词： hydrogen peroxide dielectric barrier discharge pulsed discharge non-thermal plasma electrical parameters

Hematite reduction by hydrogen plasma:Where are we now?

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1932-1945页

作者： Kali Charan Sabat Department of Materials and Metallurgical Engineering Maulana Azad National Institute of TechnologyBhopal462003Madhya PradeshIndia

Currently,iron is extracted from ores such as hematite by carbothermic reduction.The extraction process includes several unit steps/processes that require large-scale equipment and significant financial investments.Additionally,the extraction process produces a substantial amount of harmful carbon dioxide(CO_(2)).Alternative to carbothermic reduction is the reduction by hydrogen plasma(HP).HP is mainly composed of exciting species that facilitate hematite reduction by providing thermodynamic and kinetic advantages,even at low temperatures.In addition to these advantages,hematite reduction by HP produces water,which is environmentally beneficial.This report reviews the theory and practice of hematite reduction by HP.Also,the present state of the art in solid-state and liquid-state hematite reduction by HP has been examined.The in-flight hematite reduction by HP has been identified as a potentially promising alternative to carbothermic reduction.However,the in-flight reduction is still plagued with problems such as excessively high temperatures in thermal HP and considerable vacuum costs in non-thermal HP.These problems can be overcome by using non-thermal atmospheric HP that deviates significantly from local thermodynamic equilibrium.

关键词： hematite iron ore hematite reduction iron production hydrogen plasma non-thermal plasma thermodynamics kinetics

Adsorption-oxidation of hydrogen sulfide on Fe/walnut-shell activated carbon surface modified by NH_3-plasma

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Journal of Environmental Sciences 2018年第2期30卷 216-226页

作者： Ping Ning Sijian Liu Chi Wang Kai Li Xin Sun Lihong Tang Gui Liu Faculty of Environmental Science and Engineering Kunming University of Science and Technology Faculty of Chemical Engineering Kunming University of Science and Technology

Walnut-shell activated carbon（WSAC） supported ferric oxide was modified by non-thermal plasma（NTP）, and the removal efficiency for hydrogen sulfide over Fe/WSAC modified by dielectric barrier discharge（DBD） was significantly promoted. The sample modified for10 min and 6.8 k V output（30 V input voltage） maintained 100% H2 S conversion over a long reaction time of 390 min. The surface properties of adsorbents modified by NTP under different conditions were evaluated by the methods of X-ray photoelectron spectroscopy（XPS）, Brunauer–Emmett–Teller（BET） analysis and in-situ Fourier transform infrared spectroscopy（FTIR）, to help understand the effect of the NTP treatment. NTP treatment enhanced the adsorption capacity of Fe/WSAC, which could due to the formation of micro-pores with sizes of0.4, 0.5 and 0.75 nm. XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment, and lattice oxygen is beneficial for H2 S oxidation. From the in-situ FTIR result,transformation of the reaction path on Fe/WSAC was observed after NTP modification. The research results indicate that NTP is an effective method to improve the surface properties of the Fe/WSAC catalyst for H2 S adsorption-oxidation.

关键词： Dielectric barrier discharge non-thermal plasma Surface modification Hydrogen sulfide Fe/walnut-shell activated carbon（Fe/WSAC）

Catalytic decomposition performance for O_3 and NO_2 in humid indoor air on a MnO_x/Al_2O_3 catalyst modified by a cost-effective chemical grafting method

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Journal of Environmental Sciences 2018年第12期30卷 58-70页

作者： Longwen Chen Michel Ondarts Jonathan Outin Yves Gonthier Evelyne Gonze Université Grenoble Alpes Université Savoie Mont Blanc CNRS Laboratoire d'Optimisation de la Conception et Ingénierie de l'Environnement(LOCIE)

Processes based on non-thermal plasma（NTP） for indoor air treatment inevitably lead to the formation of toxic by-products such as ozone（O3） and nitrogen oxides（NOx）. Adding a step of heterogeneous catalysis in series with NTP could allow for the decomposition of the by-products. Therefore, different catalysts were developed based on transition metal oxides, such as NiOx, CoOxand MnOxwith different weight percentage 1, 5 and 10 wt.%,deposited on a γ-Al2O3 support. The O3 removal efficiency（ORE） and the NOxremoval efficiency（NRE） were very encouraging in dry air： about 65% and 80%, respectively, by using2 g 5 wt.% MnOx/Al2O3 catalyst under the experimental conditions. However, strongly negative effects of relative humidity（RH） on the catalytic decomposition performance were observed. To overcome this limitation, the catalyst surface was modified to make it hydrophobic using a cost-effective chemical grafting method. This treatment consisted in impregnating the 5 wt.% MnOx/Al2O3 catalyst with different trichloro（alkyl）silanes（TCAS）.The effects of different linker lengths and amounts of TCAS for the hydrophobicity and the decomposition performance of surface-modified catalysts under humid conditions were investigated. Our results show that the surface-modified catalyst with the shortest linker and 0.25 mmol/gcatof modifying agent represents the best catalytic decomposition performance for O3. Its ORE is 41% at 60% RH, which is twice that of the non-modified catalyst.

关键词： Indoor air treatment non-thermal plasma MnOx/Al2O3catalyst Surface modification Ozone

Characteristics of emissive spectrum and the removal of nitric oxide in N_2/O_2/NO plasma with argon additive

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Journal of Environmental Sciences 2009年第6期21卷 790-794页

作者： LIN Wenfeng,ZHANG Bin,HOU Wenhui,LI Dawei,YANG Hongmin School of Power Engineering,Nanjing Normal University,Nanjing 210042,China School of Power Engineering Nanjing Normal University Nanjing 210042 China. E-mail: booboo.ai@***

Although the approach using non-thermal plasma（NTP） for deNOx has been studied for over 15 years,how to achieve higher removal effciency with lower cost is still a barrier for its industrial application.In order to investigate the impact of the argon additive on electron density,energy and nitric oxide reduction process in plasma,the spectrum of the dielectric barrier discharge at atmospheric pressure in a coaxial reactor was measured using the monochromater with high resolution.The comparative experiments for NO reduction were carried out simultaneously in N2/O2/NO plasma stream with and without argon,respectively.The nitrogen molecular spectrum which is attributed to the energy level transition（C^3πu→ B^3πg） was compared in the wavelength range 300-480 nm and the electron density and temperature were determined based on the relative intensities and Stark broadening width of spectral lines.The spectrum results indicated that the argon additive could enhance the intensity of emissive spectrum of plasma,thus the electron concentration as well as the energy was increased,and finally prompted the ionization rate to produce active N,O and O3.The results of NO reduction showed that NO conversion effciency increased in the range of 10%-30% with 5% addition of argon in stream comparing with the condition without argon additive.This study will play a positive role in the industrial application of dielectric barrier discharge deNOx reactor.

关键词： argon emissive spectrum nitric oxide non-thermal plasma

Degradation of antibiotic contaminants from water by gas–liquid underwater discharge plasma

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plasma Science and Technology 2023年第3期25卷 161-170页

作者：卢伏周建吴征威 School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China Institute of Advanced Technology University of Science and Technology of ChinaHefei 230022People’s Republic of China

Antibiotic contamination adversely affects human health and ecological balance.In this study,gasliquid underwater discharge plasma was employed to simultaneously degrade three antibiotics,sulfadiazine(SDZ),tetracycline(TC),and norfloxacin(NOR),to address the growing problem of antibiotic contaminants in water.The effects of various parameters on the antibiotic degradation efficiency were evaluated,including the discharge gas type and flow rate,the initial concentration and pH of the solution,and the discharge voltage.Under the optimum parameter configuration,the average removal rate of the three antibiotics was 54.0% and the energy yield was 8.9 g(kW·h)-1after 5 min treatment;the removal efficiency was 96.5% and the corresponding energy yield was4.0 g(kW·h)-1 after 20 min treatment.Reactive substance capture and determination experiments indicated that ·OH and O3 played a vital role in the decomposition of SDZ and NOR,but the role of reactive substances in TC degradation was relatively less significant.

关键词： antibiotic contamination non-thermal plasma gas–liquid underwater discharge degradation efficiency plasma reactive substances