Nikolaos dimitratos university of bologna curriculum vitae. Oxidation of methane to methanol with hydrogen peroxide using supported goldpalladium alloy nanoparticles. In recent years, research efforts have focused on the development of safe and efficient h2 generationstorage materials toward a fuelcellbased h2 economy as a longterm solution in the near future. The synthesis of supported bimetallic nanoparticles with welldefined size and compositional parameters has long been a challenge. These supported nanoparticles offer great potential as catalysts for the synthes. Identification of growth during nanoparticle immobilization, nanoscale advances. Synthesis of stable ligandfree goldpalladium nanoparticles. Supported gold palladium nanoparticles are active for the oxidation of methane, giving a high selectivity for the formation of methyl hydroperoxide and methanol, using hydrogen peroxide as the oxidant see picture. Promotion of phenol photodecomposition over tio2 using au. Group delay and dispersion in adiabatic plasmonic nanofocusing vasily kravtsov, joanna m. These micromotors actually propel themselves in a specific direction autonomously when placed in a chemical solution.
The catalytic performance of supported aupd nanoparticles with alloy and coreshell structures synthesised by colloidal methods was carried out for the aerobic oxidation of benzyl alcohol. Nanomaterials free fulltext effect of carbon support. Nikolaos dimitratos university of bologna publications. Tandem site and sizecontrolled pd nanoparticles for the. Facile removal of stabilizerligands from supported gold nanoparticles. Supported gold nanoparticles as catalysts for the oxidation of. Other readers will always be interested in your opinion of the books youve read. Colloidal methods have proven particularly suitable for producing small nanoparticles with controlled morphologies and excellent catalytic properties. Catalysis using colloidalsupported goldbased nanoparticles. Pdf the adsorbed state of a thiol on palladium nanoparticles. The synthesis of supported bimetallic nanoparticles with welldefined size. Brett and ra tiruvalam and nikolaos dimitratos and antonio lopezsanchez, title tuning the particle size in supported aupd alloy nanoparticles for catalytic evaluation, year. Mechanistic insight into the interaction between a titanium dioxide photocatalyst and pd cocatalyst for improved photocatalytic performance.
Synthesis of highly uniform and compositioncontrolled gold. Au nanoparticles trapped within nfunctionalized cnfs were more. Noble metal nanoparticles au, pd, au pd alloys with a narrow size distribution supported on nanocrystalline tio2 mtio2 have been synthesized via a solimmobilization route. Preformed au colloidal nanoparticles immobilised on nio as highly efficient heterogeneous catalysts for reduction of 4nitrophenol to 4aminophenol. The application of a water extraction treatment to retain sizestabilized au pd nanoparticles, in contrast to a more standard thermal treatment, provides the most active catalyst for this reaction. In this study, we used the syngistix nano application module for particle measurementdetection and automated data treatment. Konstandopoulos1,2 1aerosol and particle technology laboratory aptl, center for research and technology hellas, chemical process engineering. Pd local structure and size correlations to the activity of pdtio2 for photocatalytic reforming of methanol. Catalysis using colloidalsupported goldbased nanoparticles by nikolaos dimitratos, ceri hammond, christopher j. Misfet with embedded au nano particles into the gate.
Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Pdf catalysis by gold and goldpalladium nanoparticles has attracted significant. Herein, we report the development of pd nanoparticles supported on carbon nanofibers cnfs via solimmobilisation and impregnation techniques. Selective oxidation of primary carbonhydrogen bonds with oxygen is of crucial importance for the sustainable exploitation of available feedstocks. The ones marked may be different from the article in the profile. Valorisation of glycerol to fine chemicals and fuels. Bimetallic nanoparticles, composed of two different metal elements, are of a great interest from both the. Effect of aucu ratio author links open overlay panel stefania albonetti a thomas pasini a alice lolli a magda blosi c marco piccinini b nikolaos dimitratos b jose a. Graphite based materials were less active dimitratos et al. We report a convenient excess anion modification and postreduction step to the impregnation method which permits the reproducible preparation of supported bimetallic aupd nanoparticles having a tight particle size distribution comparable to that found for solimmobilization materials but without the complication of ligands adsorbed on the particle surface. Nanoparticles, in particular gold nanoparticles, have been used for millennia. Electron microscopy investigations of precious metal catalysts. Systematic study of the oxidation of methane using.
International journal of hydrogen energy vol 41, issue 41. View nikolaos dimitratos profile on linkedin, the worlds largest professional community. Selective oxidation of glycerol by highly active bimetallic catalysts at ambient temperature under basefree conditions gemma l brett, qian he, ceri hammond, peter j miedziak, nikolaos dimitratos, meenakshisundaram sankar, andrew a herzing, marco conte, jose antonio lopezsanchez, christopher j kiely, david w knight, stuart h. Onedimensional plasmon coupling by facile selfassembly of. Read the conference proceedings scientific tracks abstracts of journal of material sciences and engineering journals march, 0001.
Nikolaos dimitratos studied chemistry at the university of bath and received a phd at the university of liverpool in 2003. Surface probing by spectroscopy on titaniasupported gold. See the complete profile on linkedin and discover nikolaos. The 5 th kacstoxford petrochemical forum university of oxford. By scott rogers, diego gianolio, peter wells, nikolaos dimitratos pubs. The effect of support, stabilizing agent, and pd nanoparticles nps size was studied for sodium muconate and t,tmuconic acid hydrogenation to bioadipic acid. Catalysis using colloidalsupported goldbased nanoparticles nikolaos dimitratos. Selective oxidation of 5hydroxymethyl2furfural over. Conference proceedings scientific tracks abstracts. Read selective oxidation using supported gold and gold palladium nanoparticles prepared by sol. Transfer dehydrogenation of 1phenylethanol over pdc. A different phenol degradation pathway was observed when using.
Oxidation process of carbon nanotubes following a similar procedure to the cfs, cnts were chemically functionalized with a mixture of concentrated sulfuric and nitric. We report here that supported goldpalladium aupd nanoparticles on carbon or tio2 are active for the oxidation of the. Veith,c di wang,d maela manzoli,e laura pratia and graham j. In recent years, there has been significant interest in the utilisation of supported goldbased nanoparticles that can be effective catalysts for a broad range of chemical processes. Hutchingsb aubased catalysts have established a new important field of catalysis, revealing specific properties in. The reaction parameters such as catalyst loading and stirring rate have been optimized to determine the required conditions to carry out the reaction under kinetic regime control. Programme the continuing, central role of fossil and hydrocarbon fuels in the structured transition to a sustainable energy future monday 2 4 th august. Selective oxidation of 5hydroxymethyl2furfural over tio 2supported goldcopper catalysts prepared from preformed nanoparticles. Pandian lakshmanan, preparation and characterization of auceo 2al 2o 3 catalysts and catalytic performances in total oxidation of propene 15. We report here that supported goldpalladium aupd nanoparticles on carbon or tio2. New industrial applications for gold selected papers on catalysis from the 4th international conference on gold science, technology and its applications, university of limerick, ireland, september 36, 2006. Aqueous aupd colloids catalyze selective ch4 oxidation to.
Gold nanoparticles floating gate misfet for nonvolatile memory applications d. Group delay and dispersion in adiabatic plasmonic nanofocusing. Using in situ drifts, we demonstrate that in situ activation during methanol oxidation enhances the catalytic activity at low temperature and that this is a longlived effect. After thermal treatment at 700 c, a film of porous network composed of sintered particles. Dark field tem dftem study shows the sintered particles were composed of tens of lamellar stacks with a characteristic thickness of around 3. The interaction between pd and tio2 for promoting photocatalytic activity was investigated by tailoring the size of pd nanoparticles and monitoring the photocatalytic activity. This chapter provides an updated overview of the recent developments in the selective transformation of organic compounds such as alkanes, alkenes, alcohols, polyols and aldehydes using green catalytic processes and metal supported nanoparticles in. Ja lopezsanchez, n dimitratos, c hammond, gl brett, l kesavan.
We have determined the shell composition and thickness of the nano particles by a combination of xray absorption fine structure and xray photoelectron spectroscopy. Optimised photocatalytic hydrogen production using coreshell. Extracting structural information of au colloids at ultradilute concentrations. Oxidation of methane to methanol with hydrogen peroxide.
An amendment to this paper has been published and can be accessed via a link at the top of the paper. In this paper, we describe and discuss the utilisation of goldbased nanoparticles as efficient catalysts for a range of important reactions, with particular. Gold nanoparticles floating gate misfet for nonvolatile. Hydrogen production from formic acid decomposition in the liquid phase using pd nanoparticles supported on cnfs with different surface properties sanchez f, alotaibi mh, motta d, et al. Also at the nano scale, quantum effects can become much more important in. The selective oxidation of methane, the primary component of natural gas, remains an important challenge in catalysis. Hutchings1 selective oxidation of primary carbonhydrogen bonds with oxygen is of crucial importance for the sustainable exploitation of available feedstocks. Apr 27, 2014 the discovery of novel m aterials that can be active, selective and stable catalysts for the efficient transformation of organic molecules to useful products is of high importance. Catalysis institute cci and leads the advanced nanoparticulate materials research group, which specialises in the development of nanoparticulate materials for a range of chemical applications.
With new photocatalysts of gold nanoparticles supported on zeolite supports auzeolite, oxidation of benzyl alcohol and its derivatives into the corresponding aldehydes can proceed well with a high selectivity 99 % under visible. Methyl formate formation from methanol oxidation using. Au and ag based nanoparticles supported on titania prepared via sol immobilisation for the anaerobic, ambient temperature reforming of methanol with water for the photocatalytic production of. Multistructural aspects of catalytic soot oxidation souzana lorentzou1,2, margaritis kostoglou1,3, athanasios g. It has been reported that bimetallic nanoparticles can enhance the catalytic activity and selectivity compared to monometallic species. The chemical composition and morphology of the fresh and used catalysts. Effect of electronic and structural properties on catalytic hydrogenation of conjugated functional groups. The catalytic activity of 5 wt% pdc has been evaluated using the liquid phase transfer dehydrogenation of 1phenylethanol as a model reaction. In our previous papers we have shown that catalysts based on supported aupd nanoparticles are effective catalysts for the oxidation of polyols and alcohols,,, as well as for the synthesis of hydrogen peroxide. Technological advancements are leading the way for innovation within the petrochemical industry. Micrometre and nanometresized particles play important roles in many applications, including catalysis 1, optics 2,3, biosensing 4,5,6,7,8 and data storage 9. Sankar meenakshisundaram, oxidation of glycerol using gold catalysts.
Nikolaos dimitratos associate professor, department of industrial chemistry toso montanari alma mater studiorum verified email at unibo. Cardiff catalysis institute, cardiff university, main building, park place cf103at cardiff uk. This cited by count includes citations to the following articles in scholar. Metal nanoparticles that comprise a few hundred to several thousand atoms have many applications in areas such as photonics, sensing, medicine and catalysis. In this paper we examine the oxidation of benzyl alcohol using mild conditions and contrast the use of three reactor. Multistructural aspects of catalytic soot oxidation. Aupt nanoparticles have been prepared by a twostep methodology using polyvinyl alcohol pva as protective agent and a combination of nabh4. Supported gold nanoparticles from quantum dot to mesoscopic size scale. Oxidation of benzyl alcohol using supported goldpalladium. Synthesis of highly uniform and compositioncontrolled. We used colloidal goldpalladium nanoparticles, rather than the same nanoparticles supported on titanium oxide, to oxidize methane to methanol with high selectivity 92% in aqueous solution at mild temperatures. Pdf selective liquid phase oxidation with supported. Read systematic study of the oxidation of methane using supported gold palladium nanoparticles under mild aqueous conditions, topics in catalysis on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Herein, we reported the utilization of preformed aupt nanoparticles deposited on phosphorus functionalized carbons as effective catalysts for the oxidation of 5hydroxymethylfurfural hmf to furandicarboxylic acid fdca. Nanomaterials have a much greater surface area to volume ratio than their conventional forms, which can lead to greater chemical reactivity and affect their strength. Nikolaos dimitratos nd is associate professor at the university of bologna from november 2018, italy and specialises in the development of nanoparticulate materials for a range of chemical applications. Short chains and complex networks of interconnected au nanoparticle chains see figure are produced by a simple templatefree approach. Designing metal nanoparticles for catalysis ucl discovery. Electron microscopy investigations of precious metal. Dr nikolaos dimitratos nd is a chancellors research fellow at the cardi. Nikolaos dimitratos, solventfree oxidation of benzyl alcohol using aupd catalysts prepared by sol immobilisation 14.
All content in this area was uploaded by nikolaos dimitratos on jun 06, 2016. To date, heterogeneous catalysts have either shown low activity andor selectivity or have required activated oxygen donors. Three different activated carbons ac were used norit, kb, and g60 and carbon morphology did not affect the substrate conversion, but it greatly influenced the adipic acid yield. Nikolaos dimitratos chemistry world journalist muck rack. The use of solimmobilisation to prepare supported metal nanoparticles is an area of growing importance in heterogeneous catalysis. Nd studied chemistry at the university of bath and received his phd at the university of liverpool in 2003.
Mechanistic insight into the interaction between a titanium. Supported gold nanoparticles from quantum dot to mesoscopic. Pdzno catalysts for direct co 2 hydrogenation to methanol hasliza bahrujia, michael bowkera,b. Norli abdullah, hasliza bahruji, scott m rogers, peter p wells, c richard a catlow, michael bowker. Quantitative evaluation of nanoparticle dissolution kinetics. Promotion of phenol photodecomposition over tio2 using au, pd. Supported metal nanoparticles in liquidphase oxidation. Solventfree oxidation of primary carbonhydrogen bonds in. The influence of tuning the particle size of titania. Pdf selective photocatalytic oxidation of benzene for. Herein we report the development of preformed pd nanoparticles supported on carbon nano.
Nanoparticle catalysis organic chemistry inorganic chemistry chemistry. Pvp, and thpc during the synthesis of palladium nanoparticles via solimmobilisation technique on the resulted particles, and their catalytic activity on the liquid phase transfer dehydrogenation of 1phet has been investigated. Towards controlled synthesis of ultrasmall nanoparticles volume 23 supplement qian he, thomas davies, chloe dixon, sultan althahban, li lu, simon freakley, laura abis, nishtha agarwal, margherita macino, stefano cattaneo, sankar meenakshisundaram, nikolaos dimitratos, graham hatchings, christopher. Associate professor at department of industrial chemistry toso montanari chimind. He was a postdoctoral researcher at the university of milan professor laura prati and professor michele rossi and. Jan 14, 2011 selective oxidation of primary carbonhydrogen bonds with oxygen is of crucial importance for the sustainable exploitation of available feedstocks. Chemically tailorable colloidal particles from infinite. Selective liquid phase oxidation with supported metal nanoparticles. A series of nanostructured ptaumo xceo 2 m mn, fe, ti catalysts were prepared and their catalytic performance for the cooxidation of carbon monoxide co and hydrogen h 2 were evaluated at room temperature. Differences between the catalytic activity of the aupd nanoparticles on carbon and tio. Easily the most important examples are biological motors such as bacteria and any other selfpropelled cells. Selective oxidation of glycerol by highly active bimetallic.
Noble metal nanoparticles au, pd, aupd alloys with a narrow size distribution supported on nanocrystalline tio2 mtio2 have been synthesized via a solimmobilization route. Citeseerx tuning the particle size in supported aupd. The effect of metal identity and size on the photocatalytic performance of mtio2 has been systematically investigated using phenol as a probe molecule. There are many different micromotor types operating under a host of mechanisms. Petrochemical catalyst materials, processes, and emerging. New materials discovery and application, process modification and automation, and market and demand changes are just a few of the many changes occurring as a result of technology innovation and integration.
The influence of varying the stabiliser type pva, pvp, and thpc during the synthesis of palladium nanoparticles via solimmobilisation technique on the resulted particles, and their catalytic activity on the liquid phase transfer dehydrogenation of 1phet has been investigated. Facile removal of stabilizerligands from supported gold. Effect of carbon support, capping agent amount, and pd nps size for bioadipic acid production from muconic acid and sodium muconate. Raschke department of physics, department of chemistry, and jila, university of colorado, boulder, colorado 80309, usa. Ja lopez sanchez, n dimitratos, c hammond, gl brett, l kesavan.
Optical spectroscopy and computer simulations show that surface plasmons from individual noncontacting nanoparticles are strongly coupled in the resulting 1d superstructures. Tandem site and sizecontrolled pd nanoparticles for the directed hydrogenation of furfural. Although batch colloidal methods are commonly used to preform metal nanoparticles with the desired sizerange in solution, inhomogeneous mixing of the reactant solutions often leads to variations in size, structure and composition from batch. Among all the techniques, colloidal methods are well established for preparing small metal nps with narrow particle size distribution and achieving high degree of dispersion of metal nps. Photocatalytic ethanol reforming showed that the coreshell structured aupd promoters supported on tio. University has played a big role in the projects, most notably in helping establish collaborations, offer a wealth of ideas and always.
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