On the catalytic hydrogenation of polycyclic aromatic hydrocarbons into less toxic compounds by a facile recoverable catalyst

Jacinto, Marcos José; Santos, Osvaldo H C F; Landers, Richard; Kiyohara, Pedro Kunihiko; Rossi, Liane M.

doi:10.1016/j.apcatb.2009.04.031

Cited by 37 publications

(20 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two contributions corresponding to different rhodium species can be observed after deconvolution of the Rh 3d spectra. The low binding energy signal (BE of 3d 3/2 at~311.5 eV and 3d 5/2 at~306.8 eV) is consistent with rhodium metal whereas the higher (BE of 3d 3/2 at~313.4 eV and 3d 5/2 at~308.7 eV) agrees with the presence of rhodium oxide species [15]. The presence of oxygen O1s peak binding energy at 531.2 eV (not shown), characteristic of lattice oxide, coincides with the binding energy upshift of the Rh 3d peak to suggest surface oxidation.…”

Section: Resultssupporting

confidence: 73%

Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation

2011

View full text Add to dashboard Cite

Rhodium nanostructured thin film catalysts were prepared by pulsed laser deposition. The depositions were performed under vacuum and at different He background gas pressures ranging from 1 to 5 Torr. SEM, TEM, X-ray diffraction, and X-ray photoelectron spectroscopy were used to evaluate the morphology, the structure, the surface composition, and the electronic structure of the catalysts. Their electrochemical properties were studied towards CO stripping measurements in acidic solution; a reaction of critical issue to liquid fuel cells. It was discovered that rhodium (Rh) film deposited under 5 Torr of He background pressure showed the highest electroactive surface area, and the lowest onset potential of CO oxidation demonstrating an enhancement of the CO poisoning resistance. The reason for such enhanced electrocatalytic activity is ascribed to the high porosity and roughness of the Rh surface. Compared to Pt films made under similar processing conditions (5 Torr of He), Rh film displayed higher roughness factor of 58.5 (vs. 30 for Pt), a net charge due to oxidation and desorption of the CO adlayer of 385 μC cm −2 (vs. 350 μC cm −2 for Pt), and an onset potential for CO oxidation of 30 mV less anodic than that at Pt electrode.

show abstract

Section: Resultssupporting

confidence: 73%

Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation

2011

View full text Add to dashboard Cite

show abstract

“…[15] The deposition of Rh NPs (3-5nm) onto silica-coated magnetite NPs (Fe 3 O 4 @SiO 2 )d id not change this behavior but improved the recoverability. [16] Av ery similar behavior was exhibited by carbon-supported Pd (5 nm) NPs. [17] Pd NPs (2-10 nm) stabilized in high-densitypolyethylene were also investigated in the catalytic hydrogenation of anthracene in supercritical CO 2 (200 atm with 10 atm of H 2 )b yi nsitu UV/Vis spectroscopy.K inetic studies confirmed that in the presence of the NPs the initial hydrogenation occurs mainly at the external rings.…”

Section: Introductionmentioning

confidence: 65%

Hydrogenation of Condensed Aromatic Compounds over Mesoporous Bifunctional Catalysts Following a Diels–Alder Adduct Pathway

et al. 2016

View full text Add to dashboard Cite

Pt(0.5 wt %)‐Al‐SBA‐15 and Pt(0.5 wt %)‐Al‐MCM‐41 bifunctional catalysts were prepared by wet impregnation and investigated in the hydrogenation of anthracene and the hydrogenolysis/hydrogenation of a series of synthesized Diels–Alder adducts with anthracene and anthracene derivatives. The mesoporous texture of the investigated catalysts allowed the hydrogenation of these substrates to a large extent. In direct correlation with the size of the Pt particles, Pt‐Al‐SBA‐15 exhibited a higher activity. Both catalysts exhibited a strong Lewis acidity associated with the presence of the Al extra‐framework species. The acidity of these catalysts afforded the esterification of the reaction byproduct, that is, succinic anhydride, with methanol or ethanol, and the hydrocracking/decyclization of one hydrogenated ring to lead to 1,2,3,4‐tetrahydronaphthalene derivatives. A good correlation with the calculated values of the reaction Gibbs free energy has been evidenced.

show abstract

“…The material obtained is far superior in terms of morphology control and particle size than those prepared before and has been applied in our group as a support for a variety of applications in drug delivery, separation of enzymes and catalysts. [53][54][55][56][57][58] Another interesting feature is that the thermal stability of the magnetite nanoparticles was increased after the coating with a layer of silica. The pure magnetic nanoparticles loose the magnetic properties after thermal treatment (500 °C, 2 h, air), while the silica-coated magnetite preserved its magnetic properties.…”

Section: Coating Magnetite With Silicamentioning

confidence: 99%

“…This same catalyst has shown very interesting catalytic activities in the liquid hydrogenation of polycyclic aromatic hydrocarbons. 57 The Pt NP catalyst is highly active in the hydrogenation of ketones, alkenes and arenes. The substrates were converted to the fully hydrogenated form, but partially hydrogenated products were also isolated by stopping the reaction at the time indicated by the hydrogen profile of the hydrogenation curve (e.g., ethylbenzene was isolated with 98.9% selectivity during hydrogenation of styrene).…”

Section: Rhodium Platinum and Iridium Catalystsmentioning

confidence: 99%

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Rossi¹,

Garcia²,

Vono³

2012

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

O objetivo deste Account é fornecer uma visão geral de nossas atividades atuais de pesquisa, as quais envolvem a síntese e modificação de nanomateriais superparamagnéticos para aplicação na área de separação magnética e catálise. Primeiramente, uma introdução ao magnetismo e à separação magnética é feita. Em seguida, estratégias sintéticas que têm sido desenvolvidas para gerar nanopartículas superparamagnéticas revestidas esfericamente por sílica e outros óxidos, com destaque a sistemas bem caracterizados e preparados por metodologias que geram amostras de elevada qualidade e que, a princípio, podem ser produzidas em maior escala, são discutidas. Uma série de catalisadores magneticamente recuperáveis preparados em nosso grupo de pesquisa pela combinação única de suportes superparamagnéticos e nanopartículas metálicas é destacada. Este Account é concluído com observações pessoais e perspectivas neste campo de pesquisa.The aim of this Account is to provide an overview of our current research activities on the design and modification of superparamagnetic nanomaterials for application in the field of magnetic separation and catalysis. First, an introduction of magnetism and magnetic separation is done. Then, the synthetic strategies that have been developed for generating superparamagnetic nanoparticles spherically coated by silica and other oxides, with a focus on well characterized systems prepared by methods that generate samples of high quality and easy to scale-up, are discussed. A set of magnetically recoverable catalysts prepared in our research group by the unique combination of superparamagnetic supports and metal nanoparticles is highlighted. This Account is concluded with personal remarks and perspectives on this research field.

show abstract

On the catalytic hydrogenation of polycyclic aromatic hydrocarbons into less toxic compounds by a facile recoverable catalyst

Cited by 37 publications

References 23 publications

Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation

Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation

Hydrogenation of Condensed Aromatic Compounds over Mesoporous Bifunctional Catalysts Following a Diels–Alder Adduct Pathway

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Contact Info

Product

Resources

About