Base de dados : MEDLINE
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  1 / 82934 MEDLINE  
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[PMID]:29367488
[Au] Autor:Autthanit C; Jongsomjit B
[Ad] Endereço:Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University.
[Ti] Título:Production of Ethylene through Ethanol Dehydration on SBA-15 Catalysts Synthesized by Sol-gel and One-step Hydrothermal Methods.
[So] Source:J Oleo Sci;67(2):235-243, 2018 Feb 01.
[Is] ISSN:1347-3352
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:The present work deals with the catalytic performance of SBA-15 supported catalysts in the gas phase catalytic dehydration of ethanol in the temperature range of 200 to 400°C. The SBA-15 support was incorporated on a zirconium (Zr) and bimetal of zirconium and lanthanum (Zr-La) prepared by sol-gel (SG) and hydrothermal (HT) methods. The catalysts were characterized by means of N physisorption, SEM/EDX, and NH -TPD. The experimental results demonstrated that the Zr-La/SBA-15-HT exhibited the highest catalytic activity. Ethanol conversion and ethylene selectivity were found to increase with increased reaction temperature. The best catalytic results were achieved for Zr-La/SBA-15-HT indicating values of ethanol conversion and ethylene yield of ca. 84% and 80%, respectively at 400°C. The most important parameter influencing their catalytic properties appears to be the interaction between metal and support depending on different methods. The metal dispersion inside the siliceous matrix of SBA-15 has a direct influence on their surface acidity. Meanwhile, the performance of these SBA-15 supported catalysts in ethanol dehydration is also related with the alteration of surface acidity caused by the introduction of Zr and Zr-La.
[Mh] Termos MeSH primário: Química Orgânica/métodos
Etanol/química
Etilenos/síntese química
Dióxido de Silício/química
[Mh] Termos MeSH secundário: Catálise
Dessecação
Lantânio/química
Temperatura Ambiente
Zircônio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethylenes); 0 (SBA-15); 3K9958V90M (Ethanol); 6I3K30563S (Lanthanum); 7631-86-9 (Silicon Dioxide); 91GW059KN7 (ethylene); C6V6S92N3C (Zirconium)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180126
[St] Status:MEDLINE
[do] DOI:10.5650/jos.ess17167


  2 / 82934 MEDLINE  
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[PMID]:29175401
[Au] Autor:Wan J; Du X; Wang R; Liu E; Jia J; Bai X; Hu X; Fan J
[Ad] Endereço:School of Chemical Engineering, Northwest University, Xi'an 710069, PR China.
[Ti] Título:Mesoporous nanoplate multi-directional assembled Bi WO for high efficient photocatalytic oxidation of NO.
[So] Source:Chemosphere;193:737-744, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Herein, a mesoporous nanoplate multi-directional assembled Bi WO architecture was successfully prepared and applied for the photocatalytic removal of NOx pollutants at low concentrations under visible light and simulated solar light irradiation. Bi WO -180-C synthesized at a hydrothermal temperature of 180 °C with calcination exhibited an excellent conversion efficiency in the photocatalytic oxidation of gaseous NO. The crystallinity, morphology, specific surface area, pore environment, light absorption, and separation of photogenerated electrons and holes were investigated by various techniques; the excellent photocatalytic performance of Bi WO -180-C was attributed to its special hierarchical mesoporous structure with an appropriate pore size and interconnected porous network, which imparted good gas permeability and fast mass transfer of reaction intermediates and final products of NO oxidation. Furthermore, hierarchical mesoporous Bi WO showed excellent photocatalytic durability and reusability.
[Mh] Termos MeSH primário: Bismuto/química
Catálise
Óxido Nítrico/química
Óxido Nítrico/efeitos da radiação
[Mh] Termos MeSH secundário: Gases
Luz
Oxidantes Fotoquímicos
Oxirredução
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Gases); 0 (Oxidants, Photochemical); 31C4KY9ESH (Nitric Oxide); U015TT5I8H (Bismuth)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


  3 / 82934 MEDLINE  
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[PMID]:28456645
[Au] Autor:Wang W; Bai Q; Liang T; Bai H; Liu X
[Ad] Endereço:Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China. Electronic address: ww12230098@sina.com.
[Ti] Título:Preparation of amino-functionalized regenerated cellulose membranes with high catalytic activity.
[So] Source:Int J Biol Macromol;102:944-951, 2017 Sep.
[Is] ISSN:1879-0003
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The modification of regenerated cellulose (RC) membranes was carried out by using silane coupling agents presenting primary and secondary amino-groups. The grafting of the amino groups onto the modified cellulose molecule was confirmed by X-ray photoelectron spectroscopies and C nuclear magnetic resonance spectroscopic analyses. The crystallinity of the cellulose membranes (CM) decreased after chemical modification as indicated by the X-ray diffraction results. Moreover, a denser structure was observed at the surface and cross section of the modified membranes by SEM images. The contact angle measurements showed that the silane coupling treatment enhanced the hydrophobicity of the obtained materials. Then the catalytic properties of two types of modified membranes were studied in a batch process by evaluating their catalytic performance in a Knoevenagel condensation. The results indicated that the cellulose membrane grafted with many secondary amines exhibited a better catalytic activity compared to the one grafted only by primary amines. In addition, the compact structure of the modified membranes permitted their application in a pervaporation catalytic membrane reactor. Therefore, functional CM that prepared in this paper represented a promising material in the field of industrial catalysis.
[Mh] Termos MeSH primário: Celulose/química
Membranas Artificiais
[Mh] Termos MeSH secundário: Catálise
Silanos/química
Propriedades de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Membranes, Artificial); 0 (Silanes); 9004-34-6 (Cellulose)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170501
[St] Status:MEDLINE


  4 / 82934 MEDLINE  
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[PMID]:28987402
[Au] Autor:Wang J; Chen S; Quan X; Yu H
[Ad] Endereço:Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
[Ti] Título:Fluorine-doped carbon nanotubes as an efficient metal-free catalyst for destruction of organic pollutants in catalytic ozonation.
[So] Source:Chemosphere;190:135-143, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Metal-free carbon materials have been presented to be potential alternatives to metal-based catalysts for heterogeneous catalytic ozonation, yet the catalytic performance still needs to be enhanced. Doping carbon with non-metallic heteroatoms (e.g., N, B, and F) could alter the electronic structure and electrochemical properties of original carbon materials, has been considered to be an effective method for improving the catalytic activity of carbon materials. Herein, fluorine-doped carbon nanotubes (F-CNTs) were synthesized via a facile method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The as-synthesized F-CNTs exhibited notably enhanced catalytic activity towards catalytic ozonation for the degradation of organic pollutants. The oxalic acid removal efficiency of optimized F-CNTs was approximately two times as much as that of pristine CNTs, and even exceeded those of four conventional metal-based catalysts (ZnO, Al O , Fe O , and MnO ). The XPS and Raman studies confirmed that the covalent CF bonds were formed at the sp C sites instead of sp C sites on CNTs, not only resulting in high positive charge density of C atoms adjacent to F atoms, but remaining the delocalized π-system with intact carbon structure of F-CNTs, which then favored the conversion of ozone molecules (O ) into reactive oxygen species (ROS) and contributed to the high oxalic acid removal efficiency. Furthermore, electron spin resonance (ESR) studies revealed that superoxide radicals (O ) and singlet oxygen ( O ) might be the dominant ROS that responsible for the degradation of oxalic acid in these catalytic systems.
[Mh] Termos MeSH primário: Poluentes Ambientais/química
Flúor/química
Nanotubos de Carbono/química
Ozônio/química
[Mh] Termos MeSH secundário: Catálise
Fluoretos
Compostos Orgânicos/química
Ácido Oxálico/química
Análise Espectral
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Nanotubes, Carbon); 0 (Organic Chemicals); 284SYP0193 (Fluorine); 66H7ZZK23N (Ozone); 9E7R5L6H31 (Oxalic Acid); Q80VPU408O (Fluorides)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171009
[St] Status:MEDLINE


  5 / 82934 MEDLINE  
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[PMID]:28985653
[Au] Autor:Amiri H; Nabizadeh R; Silva Martinez S; Jamaleddin Shahtaheri S; Yaghmaeian K; Badiei A; Nazmara S; Naddafi K
[Ad] Endereço:Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
[Ti] Título:Response surface methodology modeling to improve degradation of Chlorpyrifos in agriculture runoff using TiO solar photocatalytic in a raceway pond reactor.
[So] Source:Ecotoxicol Environ Saf;147:919-925, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:This paper deals with the use of a raceway pond reactor (RPR) as an alternative photoreactor for solar photocatalytic applications. Raceway pond reactors are common low-cost reactors which can treat large volumes of water. The experiments were carried out with TiO in the agriculture effluent spiked with Chlorpyrifos (CPF) at circumneutral pH. The Response Surface Methodology (RSM) was used to find the optimum process parameters to maximize CPF oxidation from the mathematical model equations developed in this study using R software. By ANOVA, p-value of lack of fit > 0.05 indicated that, the equation was well-fitted. The theoretical efficiency of CPF removal, under the optimum oxidation conditions with UV solar energy of around 697 ± 5.33 lux, was 84.01%, which is in close agreement with the mean experimental value (80 ± 1.42%) confirming that the response model was suitable for the optimization. As far as the authors know, this is the first study of CPF removal using RPR in agriculture runoff at circumneutral pH.
[Mh] Termos MeSH primário: Clorpirifos/análise
Modelos Teóricos
Tanques/química
Luz Solar
Titânio/química
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Agricultura
Catálise
Clorpirifos/efeitos da radiação
Oxirredução
Propriedades de Superfície
Poluentes Químicos da Água/efeitos da radiação
Poluição da Água/prevenção & controle
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 15FIX9V2JP (titanium dioxide); D1JT611TNE (Titanium); JCS58I644W (Chlorpyrifos)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171008
[St] Status:MEDLINE


  6 / 82934 MEDLINE  
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[PMID]:28946119
[Au] Autor:Wanag A; Rokicka P; Kusiak-Nejman E; Kapica-Kozar J; Wrobel RJ; Markowska-Szczupak A; Morawski AW
[Ad] Endereço:West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Institute of Inorganic Technology and Environment Engineering, Pulaskiego 10, 70-322 Szczecin, Poland. Electronic address: awanag@zut.edu.pl.
[Ti] Título:Antibacterial properties of TiO modified with reduced graphene oxide.
[So] Source:Ecotoxicol Environ Saf;147:788-793, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In this paper, the antibacterial activity of titanium dioxide modified with reduced graphene oxide (rGO) was presented. TiO /rGO photocatalysts were prepared by the hydrothermal method under elevated pressure at 180°C and heated at 100°C in Ar flow. The obtained photocatalysts were characterized by means of XRD, FTIR/DRS, UV-vis/DR, Raman spectroscopy and scanning electron microscopy (SEM). The carbon content was also examined. FTIR/DRS and Raman analysis confirmed the presence of rGO in the TiO structure, suggesting a successful modification. The antimicrobial photoactivity of photocatalysts was conducted against E. coli under an artificial solar light. The results show that all TiO /rGO photocatalysts exhibited an antibacterial activity higher than unmodified TiO . The best result was found for sample with 1.5wt% additive of reduced graphene oxide. In this case, total inactivation of E. coli was noticed after 75min of irradiation. It was found that the presence of rGO in sample improves the antimicrobial activity.
[Mh] Termos MeSH primário: Antibacterianos/farmacologia
Desinfecção/métodos
Escherichia coli/efeitos dos fármacos
Grafite/química
Titânio/farmacologia
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Antibacterianos/química
Catálise
Escherichia coli/efeitos da radiação
Óxidos/química
Propriedades de Superfície
Titânio/química
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Oxides); 15FIX9V2JP (titanium dioxide); 7782-42-5 (Graphite); D1JT611TNE (Titanium)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170926
[St] Status:MEDLINE


  7 / 82934 MEDLINE  
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[PMID]:29402942
[Au] Autor:Kwan CS; Zhao R; Van Hove MA; Cai Z; Leung KC
[Ad] Endereço:Department of Chemistry and Partner State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong.
[Ti] Título:Higher-generation type III-B rotaxane dendrimers with controlling particle size in three-dimensional molecular switching.
[So] Source:Nat Commun;9(1):497, 2018 02 05.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Type III-B rotaxane dendrimers (T3B-RDs) are hyperbranched macromolecules with mechanical bonds on every branching unit. Here we demonstrate the design, synthesis, and characterization of first to third (G1-G3), and up to the fourth (G4) generation (MW > 22,000 Da) of pure organic T3B-RDs and dendrons through the copper-catalyzed alkyne-azide cycloaddition (CuAAC) reaction. By utilizing multiple molecular shuttling of the mechanical bonds within the sphere-like macromolecule, a collective three-dimensional contract-extend molecular motion is demonstrated by diffusion ordered spectroscopy (DOSY) and atomic force microscopy (AFM). The discrete T3B-RDs are further observed and characterized by AFM, dynamic light scattering (DLS), and mass spectrometry (MS). The binding of chlorambucil and pH-triggered switching of the T3B-RDs are also characterized by H-NMR spectroscopy.
[Mh] Termos MeSH primário: Dendrímeros/síntese química
Rotaxanos/síntese química
[Mh] Termos MeSH secundário: Catálise
Cobre/química
Dendrímeros/química
Substâncias Macromoleculares
Modelos Moleculares
Estrutura Molecular
Movimento (Física)
Tamanho da Partícula
Rotaxanos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Dendrimers); 0 (Macromolecular Substances); 0 (Rotaxanes); 789U1901C5 (Copper)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-018-02902-z


  8 / 82934 MEDLINE  
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[PMID]:28470848
[Au] Autor:Camprubi E; Jordan SF; Vasiliadou R; Lane N
[Ad] Endereço:Department of Genetics, Evolution and Environment, University College London, London, UK.
[Ti] Título:Iron catalysis at the origin of life.
[So] Source:IUBMB Life;69(6):373-381, 2017 06.
[Is] ISSN:1521-6551
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Iron-sulphur proteins are ancient and drive fundamental processes in cells, notably electron transfer and CO fixation. Iron-sulphur minerals with equivalent structures could have played a key role in the origin of life. However, the 'iron-sulphur world' hypothesis has had a mixed reception, with questions raised especially about the feasibility of a pyrites-pulled reverse Krebs cycle. Phylogenetics suggests that the earliest cells drove carbon and energy metabolism via the acetyl CoA pathway, which is also replete in Fe(Ni)S proteins. Deep differences between bacteria and archaea in this pathway obscure the ancestral state. These differences make sense if early cells depended on natural proton gradients in alkaline hydrothermal vents. If so, the acetyl CoA pathway diverged with the origins of active ion pumping, and ancestral CO fixation might have been equivalent to methanogens, which depend on a membrane-bound NiFe hydrogenase, energy converting hydrogenase. This uses the proton-motive force to reduce ferredoxin, thence CO . The mechanism suggests that pH could modulate reduction potential at the active site of the enzyme, facilitating the difficult reduction of CO by H . This mechanism could be generalised under abiotic conditions so that steep pH differences across semi-conducting Fe(Ni)S barriers drives not just the first steps of CO fixation to C1 and C2 organics such as CO, CH SH and CH COSH, but a series of similar carbonylation and hydrogenation reactions to form longer chain carboxylic acids such as pyruvate, oxaloacetate and α-ketoglutarate, as in the incomplete reverse Krebs cycle found in methanogens. We suggest that the closure of a complete reverse Krebs cycle, by regenerating acetyl CoA directly, displaced the acetyl CoA pathway from many modern groups. A later reliance on acetyl CoA and ATP eliminated the need for the proton-motive force to drive most steps of the reverse Krebs cycle. © 2017 IUBMB Life, 69(6):373-381, 2017.
[Mh] Termos MeSH primário: Acetilcoenzima A/química
Ferredoxinas/química
Proteínas com Ferro-Enxofre/química
Ferro/química
Origem da Vida
[Mh] Termos MeSH secundário: Acetilcoenzima A/metabolismo
Archaea/química
Archaea/metabolismo
Bactérias/química
Bactérias/metabolismo
Ciclo do Carbono
Dióxido de Carbono/química
Dióxido de Carbono/metabolismo
Catálise
Ciclo do Ácido Cítrico
Ferredoxinas/metabolismo
Concentração de Íons de Hidrogênio
Fontes Hidrotermais
Ferro/metabolismo
Proteínas com Ferro-Enxofre/metabolismo
Ácidos Cetoglutáricos/química
Ácidos Cetoglutáricos/metabolismo
Ácido Oxaloacético/química
Ácido Oxaloacético/metabolismo
Prótons
Ácido Pirúvico/química
Ácido Pirúvico/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferredoxins); 0 (Iron-Sulfur Proteins); 0 (Ketoglutaric Acids); 0 (Protons); 142M471B3J (Carbon Dioxide); 2F399MM81J (Oxaloacetic Acid); 72-89-9 (Acetyl Coenzyme A); 8558G7RUTR (Pyruvic Acid); 8ID597Z82X (alpha-ketoglutaric acid); E1UOL152H7 (Iron)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1002/iub.1632


  9 / 82934 MEDLINE  
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[PMID]:29478649
[Au] Autor:Xia Y; Xia L; Liu Y; Yang T; Deng J; Dai H
[Ad] Endereço:College of Chemistry and Chemical Engineering, Bohai University, Jinzhou 121013, China; Key Laboratory of Beijing on Regional Air Pollution Control, Beijing Key Laboratory for Green Catalysis and Separation, MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, and College of Environ
[Ti] Título:Concurrent catalytic removal of typical volatile organic compound mixtures over Au-Pd/α-MnO nanotubes.
[So] Source:J Environ Sci (China);64:276-288, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:α-MnO nanotubes and their supported Au-Pd alloy nanocatalysts were prepared using hydrothermal and polyvinyl alcohol-protected reduction methods, respectively. Their catalytic activity for the oxidation of toluene/m-xylene, acetone/ethyl acetate, acetone/m-xylene and ethyl acetate/m-xylene mixtures was evaluated. It was found that the interaction between Au-Pd alloy nanoparticles and α-MnO nanotubes significantly improved the reactivity of lattice oxygen, and the 0.91wt.% Au Pd/α-MnO nanotube catalyst outperformed the α-MnO nanotube catalyst in the oxidation of toluene, m-xylene, ethyl acetate and acetone. Over the 0.91wt.% Au Pd/α-MnO nanotube catalyst, (i) toluene oxidation was greatly inhibited in the toluene/m-xylene mixture, while m-xylene oxidation was not influenced; (ii) acetone and ethyl acetate oxidation suffered a minor impact in the acetone/ethyl acetate mixture; and (iii) m-xylene oxidation was enhanced whereas the oxidation of the oxygenated VOCs (volatile organic compounds) was suppressed in the acetone/m-xylene or ethyl acetate/m-xylene mixtures. The competitive adsorption of these typical VOCs on the catalyst surface induced an inhibitive effect on their oxidation, and increasing the temperature favored the oxidation of the VOCs. The mixed VOCs could be completely oxidized into CO and H O below 320°C at a space velocity of 40,000mL/(g·hr). The 0.91wt.% Au Pd/α-MnO nanotube catalyst exhibited high catalytic stability as well as good tolerance to water vapor and CO in the oxidation of the VOC mixtures. Thus, the α-MnO nanotube-supported noble metal alloy catalysts hold promise for the efficient elimination of VOC mixtures.
[Mh] Termos MeSH primário: Modelos Químicos
Nanotubos/química
Compostos Orgânicos Voláteis/química
[Mh] Termos MeSH secundário: Catálise
Ouro/química
Compostos de Manganês/química
Óxidos/química
Paládio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Manganese Compounds); 0 (Oxides); 0 (Volatile Organic Compounds); 5TWQ1V240M (Palladium); 7440-57-5 (Gold); TF219GU161 (manganese dioxide)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


  10 / 82934 MEDLINE  
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[PMID]:29478631
[Au] Autor:Wen Z; Duan X; Hu M; Cao Y; Ye L; Jiang L; Yuan Y
[Ad] Endereço:State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
[Ti] Título:Efficient low-temperature soot combustion by bimetallic Ag-Cu/SBA-15 catalysts.
[So] Source:J Environ Sci (China);64:122-129, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In this study, the effects of copper (Cu) additive on the catalytic performance of Ag/SBA-15 in complete soot combustion were investigated. The soot combustion performance of bimetallic Ag-Cu/SBA-15 catalysts was higher than that of monometallic Ag and Cu catalysts. The optimum catalytic performance was acquired with the 5Ag -Cu /SBA-15 catalyst, on which the soot combustion starts at T =225°C with a T =285°C. The temperature for 50% of soot combustion was lower than that of conventional Ag-based catalysts to more than 50°C (Aneggi et al., 2009). Physicochemical characterizations of the catalysts indicated that addition of Cu into Ag could form smaller bimetallic Ag-Cu nanolloy particles, downsizing the mean particle size from 3.7nm in monometallic catalyst to 2.6nm in bimetallic Ag-Cu catalyst. Further experiments revealed that Ag and Cu species elicited synergistic effects, subsequently increasing the content of surface active oxygen species. As a result, the structure modifications of Ag by the addition of Cu strongly intensified the catalytic performance.
[Mh] Termos MeSH primário: Modelos Químicos
Fuligem/química
[Mh] Termos MeSH secundário: Catálise
Cobre/química
Ouro/química
Dióxido de Silício/química
Temperatura Ambiente
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (SBA-15); 0 (Soot); 7440-57-5 (Gold); 7631-86-9 (Silicon Dioxide); 789U1901C5 (Copper)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE



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