Luiz Gustavo Possato
@fc.unesp.br
Assistant Professor, Department of Chemistry, School of Science, Unesp, bauru
Universidade Estadual Paulista
RESEARCH, TEACHING, or OTHER INTERESTS
Catalysis, Colloid and Surface Chemistry, Global and Planetary Change, Spectroscopy
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
N. Marcuz, R.P. Ribeiro, E.C. Rangel, N.C. Cruz, L.G. Possato, K.S. Coan, C.R. Grandini, and D.R.N. Correa
Elsevier BV
Luiz H. Vieira, Leandro Martins, and Luiz G. Possato
Informa UK Limited
Leandro Martins, Laura Silva, and Luiz Possato
Sociedade Brasileira de Quimica (SBQ)
BEST PRACTICES AND PITFALLS IN THE MEASUREMENTS OF THE CATALYTIC ACTIVITY OF MATERIALS IN THERMO-CATALYSIS. As catalysis grows as a multidisciplinary research area, many questions arise regarding the procedures used to determine the activity of materials in different chemical reactions. To correct inconsistencies, whether in definitions, concepts, or experimental methods, some catalysis science journals have been publishing editorials warning less-aware authors. In this work, we present some common concepts and procedures in thermo-catalysis, reviewing good practices and pointing out frequent failures that make it difficult to reliably compare the activity between materials of the same family and results from the scientific literature.
Luiz G. Possato, Sandra H. Pulcinelli, Leandro Martins, Valerie Briois, and Celso V. Santilli
Wiley
AbstractOperando time‐resolved X‐ray absorption spectroscopy (XAS) was used to determine nickel species supported on porous MgO during the ethanol steam reforming reaction. The Principal Component Analysis (PCA) of the nickel K‐edge XAS spectra revealed Ni(OH)2, NiMgO, and metallic Ni during the activation and reaction of the catalysts. The Multivariate Curve Resolution‐Alternating Least Squares (MCR‐ALS) method for the time‐resolved XAS spectra data permitted to calculate the concentration of species during the activation and reaction steps and to determine the formation of NiMgO and nickel reduction degree. The samples prepared with surfactants, Ni10MgO‐F127 and Ni10MgO‐P123, showed less nickel reduction (less than 30 %) but were more active and stable than the reference Ni10MgO catalyst, which reduced 52 %. It happened due to the smaller particle size and a larger specific area of the porous supports. The samples synthesized without Pluronic deactivated, and ethanol dehydrogenation became predominant instead of the ethanol steam reforming.
Gabriel L. Catuzo, Luiz G. Possato, María Eugenia Sad, Cristina Padró, and Leandro Martins
Wiley
AbstractGlycerol conversion into value‐added chemicals has received much attention due to the prospect of increasing the biodiesel industry‘s profitability. The dehydration of glycerol is one of the most explored reactions in the valorization of glycerol, and the zeolite H‐ZSM‐5 is one of the furthermost used structures. In this study, several characterization techniques were used to investigate the detailed aging of coke in spent H‐ZSM‐5 zeolites after their use in the gas‐phase glycerol dehydration to produce acrolein. The carbonaceous deposits formed almost totally in the first minutes of the reaction. They rapidly got trapped inside the pores, hampering the accessibility to active sites and the zeolite‘s full catalytic action. Two types of coke were formed during the reaction: polyglycols, on the external surface, and aromatics, inside the pores, representing the majority (∼98 wt.%) of the carbonaceous compounds. Besides, aromatic compounds age over time, becoming bulkier and more deficient in hydrogen. We also found a correlation between the amount of coke, its size, accessibility to the acid active sites, and changes in crystallographic parameters of the zeolite with the presence of coke.
Luiz G. Possato, Rosembergue G.L. Gonçalves, Rodrigo M.M. Santos, Thiago F. Chaves, Valérie Briois, Sandra H. Pulcinelli, Leandro Martins, and Celso V. Santilli
Elsevier BV
Luiz G. Possato, Elen Pereira, Rosembergue G.L. Gonçalves, Sandra H. Pulcinelli, Leandro Martins, and Celso V. Santilli
Elsevier BV
Thiago F. Chaves, Luiz G. Possato, Celso V. Santilli, and Joaquín Pérez-Pariente
Elsevier BV
Roberto A. Luizon Filho, Luiz G. Possato, Oscar A.N. Santisteban, Adriano de Vasconcellos, Danilo A. da Silva, Marcelo F. Lima, Leandro Martins, and José G. Nery
Elsevier BV
Luiz G. Possato, Mauro D. Acevedo, Cristina L. Padró, Valérie Briois, Aline R. Passos, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Luiz H. Vieira, Luiz G. Possato, Thiago F. Chaves, Jason J. Lee, Taylor P. Sulmonetti, Christopher W. Jones, and Leandro Martins
Wiley
AbstractSupported transition metal catalysts have been extensively applied to oxidative and reductive processes. The understanding of surface speciation and active site‐support interactions in these materials play a substantial role in developing improved heterogeneous catalysts. Herein, a series of impregnated 3D ferrierite and 2D ITQ‐6 siliceous supports with variable loading of vanadium oxide was prepared. Chemical and structural properties of the materials were studied by X‐ray diffraction, N2 physisorption, inductively coupled plasma – optical emission spectrometry, X‐ray absorption, Fourier transform infrared and diffuse reflectance UV‐vis spectroscopies, and temperature‐programmed reduction with H2. Reactivity of the catalyst surface, associated with the incidence of isolated silanol groups, was found to be more effective when vanadium oxides were better dispersed and stabilized than increases in surface area. Differences in activation and the oxidation state dynamic behavior of active sites were then probed by methanol oxidation as a model reaction monitored by in situ FTIR spectroscopy and XANES/MS. By applying isothermal periods of reaction under non‐oxidizing atmosphere and regeneration of catalysts by O2, it was found that, even at distinct rates, all types of sites are accessible during reaction, since a complete reduction to V4+ was observed. However, reoxidation of sites to V5+ is limited and sensitive to the different vanadium species on the surface, and probably, the determinant factor of the distinct V5+/V4+ equilibrium reached for the catalysts when the reaction is carried out under constant oxidizing atmosphere.
Luiz H. Vieira, Luiz G. Possato, Thiago F. Chaves, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Luiz G. Possato, Wellington H. Cassinelli, Camilo I. Meyer, Teresita Garetto, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Luiz G. Possato, Thiago F. Chaves, Wellington H. Cassinelli, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Letícia F. Rasteiro, Luiz H. Vieira, Luiz G. Possato, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Alex Silva Paula, Luiz Gustavo Possato, Davi Rubinho Ratero, Janine Contro, Keren Keinan-Adamsky, Ricardo Reis Soares, Gil Goobes, Leandro Martins, and José G. Nery
Elsevier BV
Luiz G. Possato, Wellington H. Cassinelli, Teresita Garetto, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV
Luiz Gustavo Possato, Rosiane N. Diniz, Teresita Garetto, Sandra H. Pulcinelli, Celso V. Santilli, and Leandro Martins
Elsevier BV