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Sorption mechanism of naphthalene by diesel soot: Insight from displacement with phenanthrene/p-nitrophenol

Journal of Environmental Sciences 2021年第8期33卷 136-146页

作者： Wenhao Wu Yun Huang Daohui Lin Kun Yang Department of Environmental Science Zhejiang UniversityHangzhou 310058China Key Laboratory of Environmental Pollution and Ecological Health of Ministry of Education Hangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China

The nonlinear sorption of hydrophobic organic contaminants(HOCs)could be changed to linear sorption by the suppression of coexisting solutes in natural system,resulting in the enhancement of mobility,bioavailability and risks of HOCs in the *** previous study,inspired from the competitive adsorption on activated carbon(AC),the displaceable fraction of HOCs sorption to soot by competitor was attributed to the adsorption on elemental carbon fraction of soot(EC-soot),while the linear and nondisplaceable fraction was attributed to the partition in authigenic organic matter of soot(OM-soot).In this study,however,we observed that the linear and nondisplaceable fraction of HOC(naphthalene)to a diesel soot(D-soot)by competitor(phenanthrene or p-nitrophenol)should be attributed to not only the linear partition in OM-soot,but also the residual linear adsorption on *** also observed that the competition on the surface of soot dominated by external surface was different from that of AC dominated by micropore surface,i.e.,complete displacement of HOCs by p-nitrophenol could occur for the micropore surface of AC,but not for the external surface of *** observations were obtained through the separation of EC-soot and OM-soot from D-soot with organic-solvent extraction and the sorption comparisons of D-soot with an AC(ACF300)and a multiwalled carbon nanotube(MWCNT30).The obtained results would give new insights to the sorption mechanisms of HOCs by soot and help to assess their environmental risks.

关键词： Competitive sorption diesel soot Organic compounds Linearity External surface

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Simultaneous catalytic removal of NOx and diesel soot particulate over perovskite-type oxides and supported Ag catalysts

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Journal of Environmental Sciences 2002年第3期14卷 289-295页

作者： LiuZM HaoZP ResearchCenterforEco－EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China.e－mail：zpinghao@*** BeijinResearchInstituteofNon－FerrousMetals Beijing100088China

A series of perovskite type oxides and supported Ag catalysts were prepared, and characterized by X ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS). The catalytic activities of the catalysts as well as influencing factors on catalytic activity have been investigated for the simultaneous removal of NOx and diesel soot particulate. An increase in catalytic activity for the selective reduction of NOx was observed with Ag addition in these perovskite oxides, especially with 5% Ag loading. This catalyst could be a promising candidate of catalytic material for the simultaneous elimination of NOx and diesel soot.

关键词： perovskite type catalysts supported Ag catalyst NOx diesel soot

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Morphological and semi-quantitative characteristics of diesel soot agglomerates emitted from commercial vehicles and a dynamometer

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Journal of Environmental Sciences 2009年第4期21卷 452-457页

作者： LUO Chin-Hsiang LEE Whei-May LIAW Jiun-Jian Department of Safety Health and Environmental Engineering Hungkuang University Graduate Institute of Environmental Engineering "National" Taiwan University Graduate Institute of Information and Communication Engineering Chaoyang University of Technology

diesel soot aggregates emitted from a model dynamometer and 11 on-road vehicles were segregated by a micro-orifice uniform deposit impactor （MOUDI）. The elemental contents and morphological parameters of the aggregates were then examined by scanning electron microscopy coupled with an energy dispersive spectrometer （SEM-EDS）, and combined with a fractional Brownian motion （fBm） processor. Two mode-size distributions of aggregates collected from diesel vehicles were confirmed. Mean mass concentration of 339 mg/m3 （dC/dlogdp） existed in the dominant mode （180-320 nm）. A relatively high proportion of these aggregates appeared in PM 1, accentuating the relevance regarding adverse health effects. Furthermore, the fBm processor directly parameterized the SEM images of fractal like aggregates and successfully quantified surface texture to extract Hurst coefficients （H） of the aggregates. For aggregates from vehicles equipped with a universal cylinder number, the H value was independent of engine operational conditions. A small H value existed in emitted aggregates from vehicles with a large number of cylinders. This study found that aggregate fractal dimension related to H was in the range of 1.641-1.775, which is in agreement with values reported by previous TEM-based experiments. According to EDS analysis, carbon content ranged in a high level of 30%-50% by weight for diesel soot aggregates. The presence of Na and Mg elements in these sampled aggregates indicated the likelihood that some engine enhancers composed of biofuel or surfactants were commonly used in on-road vehicles in Taiwan. In particular, the morphological H combined with carbon content detection can be useful for characterizing chain-like or cluster diesel soot aggregates in the atmosphere.

关键词： diesel soot fractal morphology carbon fractional Brownian motion

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Preparation and Characterization of V-K Catalysts Supported on Porous α-alumina Ceramic Substrate for diesel soot Oxidation

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Journal of Wuhan University of Technology(Materials Science) 2009年第5期24卷 810-814页

作者：隋丽娜 College of Materials Science and Engineering Qingdao University of Science and Technology

The V-K catalysts were produced on porous α-alumina substrate by a solution impregnation route and the compositions and catalytic activities for soot oxidation were studied by XRD, TG/DTG, DSC and TPR. According to the catalytic activity studies, the catalytic activity of the crystalline phases is in the order： KNO3＋KVO3〉K3V5O14＋KVO3. The appearance of excessive KHCO3 phase will lead to the deterioration of catalytic activity when the catalysts contain higher KNO3 content. It is also found that when the K∶V molar ratio is higher than 1∶1, the prepared catalysts show a strong CO2 absorption characteristic and this behavior will become gradually significant with the increasing of K∶V molar ratio. Considerable amount of absorbed CO2 are strongly bonded to the crystal lattice with onset desorption temperature of 200 ℃.

关键词： V-K catalyst oxidation diesel soot catalytic activity

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Oxidation of diesel soot by several rear earth catalysts with different atmospheres

Oxidation of diesel soot by several rear earth catalysts wit...

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2004年国际稀土研究应用研讨会

作者： Dou lixin Shen Jian Liu Jiandong Gong Tianping Lu Zhenjian Wei Yunfeng Zhu HaiyangCenter of Research on Surface and Interface Chemical Engineering and Technology Nanjing University Nanjing 210093 Engineering College PLA University of Science and Technology Nanjing 210007 College of Chemistry and Environment Science Nanjing Normal University Nanjing 210097

＜正＞iesel soot is related to incomplete fuel oxidation, and posses the well-known mutagenic effects to human health. In this paper, diesel soot is collected from diesel engines and is oxidized in laboratorial micro reactor by several prepared rare earth-based catalysts with or without different harmful monoxide gases such as NO and CO, activities of several rare earth catalysts are also studied. The results indicate that soot can be more easily oxidized with monoxide gases.

关键词： diesel soot rare earth catalyst oxidation monoxide gas

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Sulfur poisoning and regeneration of MnO_x-CeO_2-Al_2O_3 catalyst for soot oxidation

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Journal of Rare Earths 2012年第7期30卷 659-664页

作者：吴晓东李亨烈刘爽翁端 Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

MnOx-CeO2-Al2O3 mixed oxides were prepared by impregnating manganese and cerium precursors on alumina powders via a sol- gel deposition method. The oxide catalyst exhibited a poor resistance to sulfur dioxide after the treatment in 100 ppm SO2/air at 350 °C for 50 h. The formation of manganese sulfate and especially cerium sulfate reduced the availability of surface active metal oxides, blocked the pore structure and decreased the surface area of the catalyst. These changes in chemical and structural and textural properties resulted in a severe loss in the activities of the sulfated catalyst for NO and soot oxidation. The decomposition of sulfates was almost complete during the calcina-tion in air at 800 °C for 30 min, which partially recovered the surface active sites and the catalyst surface area despite the significant sintering of metal oxides. Consequently, the NOx-assisted soot oxidation activity of the catalyst was regenerated to some extent by the oxidation treatment.

关键词： MnOx-CeO2-Al2O3 mixed oxides diesel soot sulfur dioxide thermal regeneration rare earths

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Application of silica-alumina as hydrothermally stable supports for Pt catalysts for acid-assisted soot oxidation

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Rare Metals 2023年第5期42卷 1614-1623页

作者： Shu-Ran Liu Shu-Ting Luo Xiao-Dong Wu Tao-Jin Wang Rui Ran Duan Weng Zhi-Chun Si Shuang Liu Key Laboratory of Advanced Materials of Ministry of Education of China School of Materials Science and EngineeringTsinghua UniversityBeijing100084China International Graduate School at Shenzhen Tsinghua UniversityShenzhen518055China School of Materials Science and Engineering Ocean University of ChinaQingdao266100China

In this work,silica-alumina mixed oxides with different SiO_(2)contents(5%and 30%)were adopted as acidic supports for platinum catalysts for soot *** obtained catalysts were hydrothermally aged in 10%H_(2)0/air at 750℃for 20 *** catalysts were characterized by X-ray diffraction(XRD),N_(2)adsorption,inductively coupled plasma(ICP),CO chemisorption,NH3temperature-programmed desorption(TPD),infrared(IR)spectroscopy of CO adsorption,temperature-programmed oxidation(TPO)of NO,and TPD of NO_(x).The surface acidity of catalyst was positive correlated with the content of SiO_(2),which kept platinum in metallic and partially oxidized states in an oxidizing *** with sulfation treatment on the alumina support,the application of SiO_(2)-Al_(2)O_(3)mixed oxides does not result in the coverage of Pt active sites and the prepared catalysts exhibit excellent activity for NO *** promote NOxpreferential adsorption on soot and decomposition of surface oxygenated compounds(SOCs)as the sulfated Pt/Al_(2)O_(3)catalyst does.

关键词： Platinum Acidic support diesel soot Hydrothermal aging

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Surface reactive species on MnO_x(0.4)-CeO_2 catalysts towards soot oxidation assisted with pulse dielectric barrier discharge

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Journal of Rare Earths 2014年第2期32卷 153-158页

作者：付名利林俊敏朱文波吴军良陈礼敏黄碧纯叶代启 College of Environment and Energy South China University of Technology Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Guangdong High Education Engineering Technology Research Center for Air Pollution Control Key Lab of Ministry of Education for Pollution Control and Ecosystem Restoration in Industry Clusters

MnOx（0.4）-CeO2 was investigated for soot oxidation assisted with a pulse dielectric barrier discharge （DBD）. The catalysts were evaluated and characterized with TPO （temperature programmed oxidation）, X-ray diffraction （XRD）, Raman and X-ray photo- electron spectroscopy （XPS）. The ignition temperature Ti for soot oxidation decreased from 240.8 to 216.4 ℃ with the increase of the pulse DBD frequencies from 50 to 400 Hz, lower than that of the case without pulse DBD present （253.4 ℃）. The results of XRD, Raman and XPS agreed well with the TPO activities of MnOx（0.4）-CeO2 towards soot oxidation. More solid solution of ceria and manganese, and surface reactive species including 02 , O and Mn4＋ were responsible for the enhancement of soot oxidation due to pulse DBD injection in the present study. For solid solution favors to the activation and transformation of those species, which are be- lieved to be involved in the soot oxidation in a hybrid catalysis-plasma.

关键词： diesel soot MnOx(0.4)-Ce02 pulse dielectric barrier discharge reactive species rare earths

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