检索结果-南通市图书馆

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2018年第1期20卷 8-15页

作者：刘杨海超张仁熙侯惠奇陈善平张瑞娜 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP~3) Institute of Environmental Science Fudan University Shanghai Institute for Design & Research on Environmental Engineering

This paper discusses the removal of nitric oxide （no） with low-temperature selective catalytic reduction driven by a dielectric barrier discharge with ammonia （NH3） as a reductant. We explored the effects of NH3, O2, temperature and water under different applied voltage on no removal at atmospheric pressure. The results showed that when the gas concentration ration of NH3/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 NH3 at a temperature of 150 ℃. Water vapor had a negative effect because no formation reactions were strengthened and NH3 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.

关键词： dielectric barrier discharge no NH3 SCR

novel promoting effects of cerium on the activities of no_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2014年第10期32卷 952-959页

作者：房志涛林涛徐海迪吴干学孙萌萌陈耀强 Key Laboratory of Green Chemistry & Technology of the Ministry of Education College of ChemistrySichuan University Center of Engineering of Vehicular Exhaust Gases Abatement Center of Engineering of Environmental Catalytic Material

A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of nox by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest no conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for nox abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2.

关键词： NH3-SCR no cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths

Performance and mechanism study for low-temperature SCR of no with propylene in excess oxygen over Pt/TiO_2 catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第9期22卷 1441-1446页

作者： Zhixiang Zhang,Mingxia Chen,Zhi Jiang,Wenfeng Shangguan Research Center for Combustion and Environmental Technology,Shanghai Jiao Tong University,Shanghai 200240,China. [a] Research Center for Combustion Environmental Technology Shanghai Jiao Tong University Shanghai 200240 China

A 0.5 wt.% Pt/TiO2 catalyst was prepared and used for the low-temperature selective catalytic reduction （SCR） of no with C3H6 in the presence of excess oxygen. The effects of Pt loading and 02 concentration on Pt/TiO2 catalytic performance for low-temperature SCR were investigated. It was found that optimal Pt loading was 0.5 wt.% and excess 02 favored low-temperature SCR of nox. The mechanism of low-temperature SCR of no with C3H6 was investigated with respect to the behavior of adsorbed species over Pt/TiO2 at 150~C using in situ DRIFTS. The results indicated that surface nitrosyl species （Pt~＋-no and Ti3＋-no） and pt2＋-CO are main reaction intermediates during the interactions of no, C3H6 and 02. A simplified no decomposition mechanism for the low-temperature SCR of no with C3H6 was proposed.

关键词： no low-temperature SCR Pt/TiO2 in situ DRIFTS

Ce-Mn mixed oxides supported on glass-fiber for low-temperature selective catalytic reduction of no with NH_3

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2014年第5期32卷 409-415页

作者：李乐刁永发刘鑫 School of Environment Science and Engineering Donghua University

Samples of cerium-manganese oxides supported on modified glass-fiber with different Ce/Mn molar ratios （Ce-Mn/GF） were prepared by an impregnation method and tested for low-temperature （80 180 ℃） selective catalytic reduction （SCR） of no with ammonia. This brand-new technology could remove no and particles matter from coal-fired flue gas. The surface properties of the catalysts were examined by means of Bmnauer-Emmett-Teller （BET）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, and scanning electron microscopy （SEM）. The experimental results showed that the catalyst with a Ce/Mn molar ratio of 0.2 obtained high activity of 87.4% no conversion at 150 ℃ under a high space velocity of 50000 h1. Deactivation poisoned by SO2 still occurred, but the Ce-Mn/GF（0.2） catalyst performed desirable tolerance to SO2 with decreasing 50% in 40 min and then maintaining at about 30% no conversion. Characterization results indicated that the excellent low-temperature catalytic activity was related to the high specific surface area, pore structure, and amorphous phase.

关键词： Mn-Ce mixed oxides glass-fiber no low-temperature SCR by NH3 SO2 poisoning rare earths

Anion intercalated layered-double-hydroxide structure for efficient photocatalytic no remove

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2019年第3期4卷 270-277页

作者： Wangchen Huo Tong Cao Xiaoying Liu Weina Xu Biqin Dong Yuxin Zhang Fan Dong State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China College of Physics Chongqing UniversityChongqing 401331China e Guangdong Provincial Key Laboratory of Durability for Marine Civil EngineeringShenzhen UniversityShenzhen 518060China

Due to the easily controllable interlayer anions, metal cation composition proportion and thickness, which is beneficial to modify surface chemical state and tune bandgap, layered double hydroxides(LDHs) have great promising potential for photocatalytic applications. In this study,we have successfully synthesized the ZnAl–LDH intercalated the single anion between ZnAl cationic interlayer without anionic impurities by using a facile calcining and reconstructing routes. The electron structure and surface chemical state of the prepared products have been investigated by combining the DFT calculation and experimental characterization methods. UV–vis DRS was used to certify the light absorption of the prepared products, and we performed the DFT calculation to demonstrate the density of state and activation of reactant. These results suggested that the ZnAl–LDH–CO3 possessed the more proper band structure and superior ability to activate no and O2 for accelerating the photocatalytic no oxidation activity. Moreover, the in situ DRIFTS with dynamically monitoring intermediates and products over the ZnAl–LDH–CO3 was adopted to declare the photocatalytic no oxidized process during the photocatalytic reaction process. This work illustrated the influence of different interlayer anions to the electron structure and surface chemical state of ZnAl–LDH structure through the experimental verification combined DFT calculation and the photocatalytic no oxidized process via in situ DRIFTS analyzing, which would provide a novel way to design and fabricate the efficient photocatalysis, and understand the reaction process.

关键词： Photocatalytic no oxidation ZnAl–LDH Reaction process and mechanism In situ DRIFTS DFT calculation

Influences of pH value in deposition-precipitation synthesis process on Pt-doped TiO_2 catalysts for photocatalytic oxidation of no

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第8期24卷 1519-1524页

作者： Shuzhen Song Zhongyi Sheng Yue Liu Haiqiang Wang Zhongbiao Wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China Guodian Science and Technology Research Institute Nanjing 210031China

This work has been undertaken to study the influences of pH value on the characteristics and activity of photocatalyst by deposition- precipitation method during its preparation process. A series of Pt-modified TiO2 were prepared by deposition-precipitation method at different pH values as well as wet impregnation method, and characterized by XRD, XPS, TEM, UV-Vis and photoluminescence （PL）. It was found that the catalysts had the highest photocatalytic activity for no conversion when pH value was kept at around 7. And the sample prepared by deposition-precipitation method showed higher activity than that by impregnation method. This was mainly due to their high value in highly-dispersed platinum oxides （PtOx） content on the surface of the catalysts. The results from UV-Vis absorption showed that highest absorbance was obtained for Pt/TiO2 prepared at pH values of around 7. And PL spectra results indicated that the recombination rate of photogenerated electrons and holes of the samples prepared by deposition-precipitation method was lower than that prepared by impregnation method. And in the zeta potential study, the pH values for the isoelectric point of the preparing slurry of 0.05 wt.%Pt/TiO2 and 0.5 wt.%Pt/TiO2 were determined to be 6.5-8.5, which further confirmed the enrichment of PtOx dopants for the catalysts repapered when pH value was around 7.

关键词： pH value ZiO2 PtOx no photocatalysis zeta potential

Conversion of no with a catalytic packedbed dielectric barrier discharge reactor

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2017年第11期19卷 67-74页

作者： Xu CAO Weixuan ZHAO Renxi ZHANG Huiqi HOU Shanping CHEN Ruina ZHANG Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention （LAP^3） Institute of Environmental Science Fudan University Shanghai 200433 People＇s Republic of China Shanghai Institute for Design ＆ Research on Environmental Engineering Shanghai 200232 People＇s Republic of China

This paper discusses the conversion of nitric oxide（no） with a low-temperature plasma induced by a catalytic packed-bed dielectric barrier discharge（DBD） reactor. Alumina oxide（Al2O3）,glass（SiO2） and zirconium oxide（ZrO2）, three different spherical packed materials of the same size, were each present in the DBD reactor. The no conversion under varying input voltage and specific energy density, and the effects of catalysts（titanium dioxide（TiO2） and manganese oxide（Mn Ox） coated on Al2O3） on no conversion were investigated. The experimental results showed that no conversion was greatly enhanced in the presence of packed materials in the reactor, and the catalytic packed bed of Mn Ox/Al2O3 showed better performance than that of TiO2/Al2O3. The surface and crystal structures of the materials and catalysts were characterized through scanning electron microscopy analysis. The final products were clearly observed by a Fourier transform infrared spectrometer and provided a better understanding of no conversion.

关键词： dielectric barrier discharge materials catalysts no electrical field

Synergetic effect of BiOCl/Bi12O17Cl2 and MoS2: in situ DRIFTS investigation on photocatalytic no oxidation pathway

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第5期38卷 437-445页

作者： Wen-Dong Zhang Xing-An Dong Yi Liang Rui Liu Yan-Juan Sun Fan Dong Chongqing Key Laboratory of Inorganic Functional Materials Department of Scientific Research ManagementChongqing Normal UniversityChongqing 401331China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China Chongqing Key Laboratory of Earth Surface Processes and Environmental Remote Sensing in Three Gorges Reservoir Area Chongqing Normal UniversityChongqing 401331.China Research Center for Environmental Science and Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

The BiOCl/Bi12O17Cl2@MoS2(BOC-MS)composites were successfully synthesized by a facile method at room *** physicochemical properties of the as-obtained samples were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),ultraviolet–visible diffuse reflection spectra(UV–Vis DRS),photoluminescence(PL),Brunauer–Emmett–Teller–Barrett–Joyner–Halenda(BET–BJH),and electron spin resonance(ESR)in ***,the in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)was applied to elucidate the adsorption and photocatalytic reaction *** optimized BOC-MS-1.0 composites exhibited excellent visible light photocatalytic capability(51.1%)and photochemical stability for removal of *** on the DMPOESR spin trapping,the·O2-radicals andáOH radicals were identified as the main active species generated from BOCMS-1.0 under visible light *** enhanced photocatalytic performance can be ascribed to the positive synergetic effect of the MoS2 and the effective carrier separation ability.

关键词： Synergetic effect BiOCl/Bi12O17Cl2 MoS2 In situ DRIFTS investigation no Oxidation pathway

Research on Plasma Chemistry Reactions in C_3H_6/no/O_2/N_2 Mixture Gases

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2010年第4期12卷 482-487页

作者：蔡忆昔张乐夫王军赵卫东王静 School of Automotive and Traffic Engineering Jiangsu University

A DBD-type （dielectric barrier discharge） NTP （non-thermal plasma） reactor was designed and an experimental system was established, in order to study the mechanism of plasma chemistry reactions in a gas mixture of C3H6/no/O2/N2. This paper is focused on a. the effects of the initial concentrations of both no and 02 upon no conversion rate and the variations of nox and 03 concentrations versus SED （specific energy density） when mixed gases of no/O2/N2 passed the NTP reactor; b. the effects of the initial concentration of C3H6 upon no oxidation and reduction reactions in mixed gases of no/N2/CaH6 and no/N2/O2/C3H6. The conclusions drawn are as follows, a. When the mixed gases of no/O2/N2 passed the NTP reactor, no was simultaneously involved in oxidation and reduction reactions with the former dominant and no2 concentration increased at the NTP reactor outlet. The no conversion rate decreased with the increase of the initial concentration of no and 02, the O3 concentration firstly increased and then decreased with the increase in SED value, b. no reduction reaction was very weak and energy consumption was very high in a mixed gases of no/N2. However, when C3H6 was added, the no conversion rate was significantly increased. When 63H6 was added to the mixed gases of no/O2/N2, the no conversion rate was significantly increased and the energy consumption was considerably reduced.

关键词： dielectric barrier discharge non-thermal plasma no conversion rate