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Dive into the research topics where Fabio B. Noronha is active.

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Featured researches published by Fabio B. Noronha.


Chemical Reviews | 2012

Production of hydrogen from ethanol: review of reaction mechanism and catalyst deactivation.

Lisiane V. Mattos; Gary Jacobs; Burtron H. Davis; Fabio B. Noronha

Mechanism and Catalyst Deactivation Lisiane V. Mattos,† Gary Jacobs,‡ Burtron H. Davis,‡ and Fab́io B. Noronha* †Departamento de Engenharia Química e de Petroĺeo, Universidade Federal Fluminense (UFF), Rua Passo da Pat́ria, 156-CEP 24210-240, Niteroí, RJ, Brazil ‡Center for Applied Energy Research, The University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511, United States Instituto Nacional de Tecnologia−INT, Av. Venezuela 82, CEP 20081-312, Rio de Janeiro, Brazil


Chemical Engineering Journal | 2001

Correlation between catalytic activity and support reducibility in the CO2 reforming of methane over Pt/CexZr1-xO2 catalysts

Fabio B. Noronha; Eugene C. Fendley; Ricardo R. Soares; Walter E. Alvarez; Daniel E. Resasco

We have investigated the relationship between the reducibility of the support and the catalytic activity of supported Pt on a series of catalysts supported on ceria‐zirconia mixed oxides. The supports were prepared by co-precipitation with varying Ce/Zr ratios. X-ray diffraction analysis indicated that, depending on the Ce/Zr ratio, solid solutions of cubic Ce x Zr1 x O2 can be formed. The reducibility of the supports was determined by X-ray photoelectron spectroscopy (XPS). After reduction at 773 K in hydrogen the fraction of reduced cerium (i.e. Ce 3C ) was found to vary with the Ce content, exhibiting a maximum at a composition Ce0:5Zr0:5O2. A good correlation was found between the reducibility and the catalytic activity. It was found that the conversion of methane and CO2 obtained on the different catalysts after 22 h on stream went through a maximum as a function of Ce content in the support and that maximum occurred at the composition that exhibited the maximum reducibility. The H2/CO product ratio was also a function of the support composition, also presenting a maximum for the Pt/Ce0:5Zr0:5O2 catalyst. The amount and nature of carbonaceous deposits were investigated by combining temperature-programmed oxidation (TPO) studies with (XPS). The TPO profiles of all the spent samples revealed two oxidation peaks, one in the low-temperature region, 623‐723 K, and the other in the high-temperature region, 873‐973 K. The peak in the high-temperature region is dominant in the unpromoted catalysts, while the peak at low temperature is more prominent in the Pt/Cex Zr1 x O2 catalysts. XPS exhibits three types of carbon with different binding energies on the spent catalysts, two of them are two forms of coke, and the third one is due to carbonates. However, all of the peaks decreased after an oxidation at intermediate temperatures (i.e. 723 K). Therefore, it appears that the different peaks observed in TPO are not due to different forms of carbon, but rather to different locations on the catalyst surface. The amount of carbonates on the spent catalysts increased with the Ce content, but the correlation between carbonate concentration and activity was not as good as that between reducibility of the support and activity.


Catalysis Today | 2002

Partial oxidation of methane on Pt/Ce–ZrO2 catalysts

Lisiane V. Mattos; E.R de Oliveira; P.D Resende; Fabio B. Noronha; Fabio B. Passos

The mechanism of partial oxidation of methane was studied on Pt/Al2O3, Pt/ZrO2 and Pt/Ce–ZrO2 catalysts. The reducibility and oxygen transfer capacity were evaluated by temperature programmed reduction (TPR) and oxygen storage capacity (OSC). The effect of the support on the cleaning mechanism of the catalyst surface was investigated by the sequence of CH4/O2 pulses. Moreover, temperature programmed surface reaction (TPSR) measurements were performed to evaluate the reaction mechanism. Pt/Ce–ZrO2 catalysts proved to be more active, stable and selective than Pt/Al2O3 and Pt/ZrO2 catalysts. The results were explained by the higher reducibility and oxygen storage/release capacity of Pt/Ce–ZrO2 catalysts, which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability and activity of the catalysts, as revealed by the CH4/O2 pulses. TPSR experiments showed that the partial oxidation of methane proceeded through a two-step mechanism.


Fuel Processing Technology | 2003

Partial oxidation and CO2 reforming of methane on Pt/Al2O3, Pt/ZrO2, and Pt/Ce–ZrO2 catalysts

L.V. Mattos; E. Rodino; Daniel E. Resasco; Fabio B. Passos; Fabio B. Noronha

Abstract The partial oxidation and CO 2 reforming of methane were studied on Pt/Al 2 O 3 , Pt/ZrO 2 , and Pt/Ce–ZrO 2 catalysts. The reducibility and the oxygen transfer capacity were evaluated by oxygen storage capacity (OSC). The effect of the support on the cleaning mechanism of the catalyst surface was investigated by the sequence of CH 4 /O 2 and CH 4 /CO 2 pulses. The Pt/Ce–ZrO 2 catalyst showed the highest stability on both partial oxidation and CO 2 reforming of methane. The results were explained by the higher reducibility and oxygen storage/release capacity of Pt/Ce–ZrO 2 catalysts, which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability of the catalysts, as revealed by the CH 4 /O 2 and CH 4 /CO 2 pulses. For Pt/Al 2 O 3 and Pt/ZrO 2 catalysts, the increase of carbon deposits around or near the metal particle inhibits the CO 2 dissociation on CO 2 reforming of methane. This effect on the CO 2 reforming of methane affects the partial oxidation of methane, which comprehends two steps: combustion of methane and CO 2 and steam reforming of unreacted methane.


Catalysis Letters | 2003

Catalytic Performance of Pt/ZrO2 and Pt/Ce-ZrO2 Catalysts on CO2 Reforming of CH4 Coupled with Steam Reforming or Under High Pressure

Fabio B. Noronha; Abolghasem Shamsi; C. Taylor; Eugene C. Fendley; Susan M. Stagg-Williams; Daniel E. Resasco

CO2 reforming of methane was performed on Pt/ZrO2 and Pt/Ce-ZrO2 catalysts at 1073 K under different reactions conditions: (i) atmospheric pressure and CH4:CO2 ratio of 1:1 and 2:1; (ii) in the presence of water and CH4:CO2 ratio of 2:1; (iii) under pressure (105 and 190 psig) and CH4:CO2 ratio of 2:1. The Pt supported on ceria-promoted ZrO2 catalyst was more stable than the Pt/ZrO2 catalyst under all reaction conditions. We ascribe this higher stability to the higher density of oxygen vacancies on the promoted support, which favors the cleaning mechanism of the metal particle. The increase of either the CH4:CO2 ratio or total pressure causes a decrease in activity for both catalysts, because under either case the rate of methane decomposition becomes higher than the rate of oxygen transfer. The Pt/Ce-ZrO2 catalyst was always more stable than the Pt/ZrO2 catalyst, demonstrating the important role of the support on this reaction.


Catalysis Letters | 2016

The Effect of Metal Type on Hydrodeoxygenation of Phenol Over Silica Supported Catalysts

Camila A. Teles; Raimundo C. Rabelo-Neto; Jerusa R. de Lima; Lisiane V. Mattos; Daniel E. Resasco; Fabio B. Noronha

Different metals supported on SiO2 were tested for the hydrodeoxygenation of phenol. For Pt/SiO2, Pd/SiO2 and Rh/SiO2 catalysts, phenol is mainly tautomerized, followed by hydrogenation of the aromatic ring. The direct dehydroxylation of phenol followed by hydrogenolysis is favored over more oxophilic metals (Ru, Co and Ni).Graphical Abstract


Membrane Science and Technology | 2011

Review of Silica Membranes for Hydrogen Separation Prepared by Chemical Vapor Deposition

Sheima J. Khatib; S. Ted Oyama; Kátia R. de Souza; Fabio B. Noronha

Abstract The application of inorganic silica membranes for sulfur hexafluoride selectivity separation at elevated temperatures has attracted much attention due to their good permselectivity and mechanical strength. These membranes are usually in the form of a thin layer of silica (selective layer) deposited on a thick porous support. One of the methods which is successfully used for deposition of the silica layers is the chemical vapor deposition (CVD), due to its versatility and reproducibility as well as high selectivities obtained with the membranes formed by this method. This chapter starts with a brief description of the basic principles of CVD and its application in the preparation of silica membranes, followed by a complete literature review which surveys the studies that have been carried out on supported silica membranes prepared through CVD and applied in hydrogen separation with two of the most commonly used supports, Vycor glass and alumina.


Journal of Natural Gas Chemistry | 2006

Methane Direct Conversion on Mo/ZSM-5 Catalysts Modified by Pd and Ru

Priscila Dias Sily; Fabio B. Noronha; Fabio B. Passos

The effect of addition of Ru and Pd to Mo/HZSM-5 catalysts used in the dehydroaromatization of methane was investigated. Catalytic tests and temperature-programmed oxidation results showed that Pd-based catalysts were more selective to naphthalene and suffered strong deactivation. The presence of Ru improved the activity and stability, with a decrease in the carbonaceous deposit probably because of a mechanism of protection of the Mo2C surface.


Chemcatchem | 2016

Ethanol to 1,3-butadiene conversion by using ZrZn-containing MgO/SiO2 systems prepared by co-precipitation and effect of catalyst acidity modification

Simoní Da Ros; Matthew D. Jones; Davide Mattia; José Carlos Pinto; Marcio Schwaab; Fabio B. Noronha; Simon A. Kondrat; Tomos J. Clarke; Stuart Hamilton Taylor

The conversion of ethanol to 1,3‐butadiene (1,3‐BD) has been investigated over ZrO2‐ and ZnO‐containing magnesia silica oxides prepared by a co‐precipitation method at different Mg‐to‐Si molar ratios. The effect of reaction temperature and ethanol flow rate was investigated. The catalyst acidity was modified through the addition of alkali metals (Na, K and Li) to the final materials. Catalysts were characterised by nitrogen physisorption analysis, X‐ray diffraction, scanning electron microscopy with energy dispersive X‐ray, temperature‐programmed desorption of ammonia, infrared spectroscopy and 29Si/(7Li) NMR spectroscopy. The catalytic results showed that the controlled reduction of catalyst acidity allows ethanol dehydration to be suppressed, whilst increasing 1,3‐BD selectivity. The best catalytic performance achieved 72 mol % for the combined 1,3‐BD and acetaldehyde selectivity.


Chemcatchem | 2017

Hydrodeoxygenation of Phenol over Zirconia-Supported Catalysts: The Effect of Metal Type on Reaction Mechanism and Catalyst Deactivation

Camila A. Teles; Raimundo C. Rabelo-Neto; Gary Jacobs; Burtron H. Davis; Daniel E. Resasco; Fabio B. Noronha

This work aims at investigating the effect of the type of metal (Pt, Pd, Rh, Ru, Cu, Ni, Co) on the performance of ZrO2‐supported catalysts for the hydrodeoxygenation of phenol in the gas phase at 573 K and 1 atm. Two different reaction pathways take place depending on the type of the metal. For Pt/ZrO2 and Pd/ZrO2 catalysts, phenol is mainly tautomerized, followed by hydrogenation of the C=C bond of the tautomer intermediate formed, producing cyclohexanone and cyclohexanol. By contrast, the direct dehydroxylation of phenol followed by hydrogenolysis might also occur over more oxophilic metals such as Rh, Ru, Co, and Ni. In addition to the metals, the oxophilic sites of this support represented by Zr4+ and Zr3+ cations near the perimeter of the metal particles also increased the selectivity to deoxygenated products. All catalysts were significantly deactivated mainly owing to the growth of metal particle size and the decrease in the density of oxophilic sites.

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Lisiane V. Mattos

Federal Fluminense University

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Gary Jacobs

University of Kentucky

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Fabio B. Passos

Federal Fluminense University

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Lídia O.O. da Costa

Instituto Militar de Engenharia

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J.M.C. Bueno

Federal University of São Carlos

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Sania M. de Lima

Federal University of São Carlos

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