Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Vannia Cristina dos Santos"'
Autor:
Vannia Cristina dos Santos-Durndell, Tailor Machado Peruzzolo, Geani Maria Ucoski, Luiz Pereira Ramos, Shirley Nakagaki
Publikováno v:
Biofuel Research Journal, Vol 5, Iss 2, Pp 806-812 (2018)
Solid magnetic nanoparticles (magnetite = Mag) composed of Fe3O4 and magnetite coated with silica (Fe3O4/SiO2 = Mag/Si) were prepared from inexpensive starting materials. The catalytic activity of the solids was investigated for palmitic acid esterif
Externí odkaz:
https://doaj.org/article/ec6dd51ac79c4f3386f3914f01acfb5e
Autor:
Lee J. Durndell, Abdallah I.M. Rabee, Gamal A.H. Mekhemer, Mark A. Isaacs, Mohamed I. Zaki, Nasr E. Fouad, Lucia Frattini, Karen Wilson, Adam F. Lee, Vannia Cristina dos Santos
Publikováno v:
Molecular Catalysis. 458:206-212
Solid acids are desirable heterogeneous catalysts for green chemistry, with zirconia and its sulfated analogues offering tunable Lewis/Bronsted character. A new route to sulfated ZrO2, and Al-substituted ZrO2 (SO4/AlxZrO2), via carbonization and calc
Autor:
Tailor Machado Peruzzolo, Shirley Nakagaki, Vannia Cristina dos Santos-Durndell, Luiz Pereira Ramos, Geani Maria Ucoski
Publikováno v:
Biofuel Research Journal, Vol 5, Iss 2, Pp 806-812 (2018)
Solid magnetic nanoparticles (magnetite = Mag) composed of Fe3O4 and magnetite coated with silica (Fe3O4/SiO2 = Mag/Si) were prepared from inexpensive starting materials. The catalytic activity of the solids was investigated for palmitic acid esterif
Autor:
Vannia Cristina dos Santos, Ana Carolina Cons Bacilla, Ângela Taís Mattei da Silva, Adam F. Lee, Karen Wilson, Karen Mary Mantovani, Shirley Nakagaki
Publikováno v:
Applied Catalysis B: Environmental. 205:498-504
A family of niobia (Nb2O5) functionalized SBA-15 solid catalysts have been prepared via wet impregnation with NbCl5 (2–32 wt% Nb) and subsequent thermal processing, for application in the acid catalyzed esterification of propanoic acid with methano
Autor:
Karen Wilson, Marta Granollers Mesa, Jinesh C. Manayil, Friederike C. Jentoft, Adam F. Lee, Vannia Cristina dos Santos
Publikováno v:
ChemCatChem. 9:2231-2238
Propylsulfonic acid (PrSO3H) derivatised solid acid catalysts have been prepared by post modification of mesoporous SBA-15 silica with mercaptopropyltrimethoxysilane (MPTMS), with the impact of co-derivatisation with octyltrimethoxysilane (OTMS) grou
Autor:
Shirley Nakagaki, Ângela Taís Mattei da Silva, Alesandro Bail, Noemi Nagata, Ana Carolina Cons Bacilla, Marianne Roque de Freitas, Katia J. Ciuffi, Liziane Marçal, Vannia Cristina dos Santos
Publikováno v:
Journal of Molecular Catalysis A: Chemical. 422:221-233
In this work a vanadium(III)-based catalyst was synthesized, characterized by thermogravimetric analysis, electron paramagnetic resonance (EPR), powder X-ray diffraction (PXRD) and FTIR spectroscopy, and its activity was evaluated during fatty acids
Publikováno v:
Applied Catalysis B: Environmental. 162:75-84
A series of WOx/ZrO2 with various tungsten loadings was prepared via incipient-wetness impregnation of zirconium hydroxide. The resulting thermally processed materials were characterised by XRD, XPS, porosimetry, NH3-TPD and pyridine FTIR spectroscop
Autor:
Vannia Cristina dos Santos, Adam F. Lee, Karen Wilson, Mark A. Isaacs, Christopher M. A. Parlett, Lee J. Durndell
Publikováno v:
dos Santos, V C, Durndell, L J, Isaacs, M A, Parlett, C M A, Wilson, K & Lee, A F 2017, ' A new application for transition metal chalcogenides : WS 2 catalysed esterification of carboxylic acids ', Catalysis Communications, vol. 91, pp. 16-20 . https://doi.org/10.1016/j.catcom.2016.12.003
The first application of WS2, a well-known graphene analogue, as a solid acid catalyst for carboxylic acid esterification is reported. WS2 exhibits excellent specific activities and high conversion to methyl esters of (65–90%) for C2–C16 carboxyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84e11ca6d4172f18433fbe273c50c036
https://doi.org/10.1016/j.catcom.2016.12.003
https://doi.org/10.1016/j.catcom.2016.12.003
Autor:
Gustavo Pimenta Ricci, Shirley Nakagaki, Alesandro Bail, Vannia Cristina dos Santos, Katia J. Ciuffi, Wido H. Schreiner, Luiz Pereira Ramos, Marianne Roque de Freitas
Publikováno v:
Applied Catalysis B: Environmental. :314-324
Molybdenum-containing silica easily synthesized by the sol–gel process was evaluated as catalyst for heterogeneous esterification reaction of fatty acids using methanol and ethanol. The molybdenum content depended on the conditions employed during
Autor:
Omar J. de Lima, Shirley Nakagaki, Luiz Pereira Ramos, Vannia Cristina dos Santos, Henrique de Oliveira Okada, Alesandro Bail, Katia J. Ciuffi
Publikováno v:
Energy & Fuels. 25:2794-2802
The development of alternative methods of biodiesel production still remains a major priority of the biofuel industry. In this work, the catalytic activity of anhydrous and insoluble sodium tungstate (Na2WO4) and its heterogenized form in silica (Na2