Ignacio contreras | Universidad Autónoma de Sinaloa (original) (raw)
Phone: +52 (667)7137860, ext. 156
Address: Facultad de Ciencias Químico Biológicas
Universidad Autónoma de Sinaloa
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Papers by Ignacio contreras
nacatsoc.org
15: with 15 wt% of La 2 O 3 and ψ: acid/base site ratio
nacatsoc.org
15: with 15 wt% of La 2 O 3 and ψ: acid/base site ratio
Studies in Surface …, Jan 1, 2010
In previous communications we have shown that the decomposition of nickel and cobalt nitrate in a... more In previous communications we have shown that the decomposition of nickel and cobalt nitrate in a flow of NO/He prevented agglomeration, yielding high nickel and cobalt oxide dispersions. We now report on the impact of NO on the decomposition of first row transition metal nitrates, i.e. Sc, Mn, Fe, Co, Ni, Cu, Zn, using thermal gravimetric analysis and mass spectrometry.
International Journal of Chemical …, Jan 1, 2005
... Behaviour of Pt-Sn Reforming Catalysts Ignacio Contreras, Gustavo Pérez, and Tomás Viveros Ab... more ... Behaviour of Pt-Sn Reforming Catalysts Ignacio Contreras, Gustavo Pérez, and Tomás Viveros Abstract ... A quasi-linear correlation between the deactivation order and the coke formation kinetic constant (Leven-spiel's parameters) was observed. ...
Energy & Fuels, Jan 1, 2009
The effect of the synthesis method over the catalytic behavior was investigated in Pt and PtSn ca... more The effect of the synthesis method over the catalytic behavior was investigated in Pt and PtSn catalysts. Catalysts synthesized using the one-step sol-gel method (OSSGM) were compared with those synthesized by conventional impregnation in the n-heptane reforming reaction at 500°C and 1 atm, showing that the one-step sol-gel synthesis enhances both the activity and the resistance to deactivation by coking. The formation of coordinatively unsaturated aluminum (Al V ) in the materials is promoted by the OSSGM, and it can be related to the increment in both their acidity and their platinum dispersion. Therefore, the bifunctionality of the catalysts, measured as the metal/acid site ratio (Ψ parameter), was also correlated to the Al V species. Higher values of Ψ implied a higher resistance to deactivation, higher rates of toluene production, and an inhibition of benzene induced by the OSSGM.
nacatsoc.org
15: with 15 wt% of La 2 O 3 and ψ: acid/base site ratio
nacatsoc.org
15: with 15 wt% of La 2 O 3 and ψ: acid/base site ratio
Studies in Surface …, Jan 1, 2010
In previous communications we have shown that the decomposition of nickel and cobalt nitrate in a... more In previous communications we have shown that the decomposition of nickel and cobalt nitrate in a flow of NO/He prevented agglomeration, yielding high nickel and cobalt oxide dispersions. We now report on the impact of NO on the decomposition of first row transition metal nitrates, i.e. Sc, Mn, Fe, Co, Ni, Cu, Zn, using thermal gravimetric analysis and mass spectrometry.
International Journal of Chemical …, Jan 1, 2005
... Behaviour of Pt-Sn Reforming Catalysts Ignacio Contreras, Gustavo Pérez, and Tomás Viveros Ab... more ... Behaviour of Pt-Sn Reforming Catalysts Ignacio Contreras, Gustavo Pérez, and Tomás Viveros Abstract ... A quasi-linear correlation between the deactivation order and the coke formation kinetic constant (Leven-spiel's parameters) was observed. ...
Energy & Fuels, Jan 1, 2009
The effect of the synthesis method over the catalytic behavior was investigated in Pt and PtSn ca... more The effect of the synthesis method over the catalytic behavior was investigated in Pt and PtSn catalysts. Catalysts synthesized using the one-step sol-gel method (OSSGM) were compared with those synthesized by conventional impregnation in the n-heptane reforming reaction at 500°C and 1 atm, showing that the one-step sol-gel synthesis enhances both the activity and the resistance to deactivation by coking. The formation of coordinatively unsaturated aluminum (Al V ) in the materials is promoted by the OSSGM, and it can be related to the increment in both their acidity and their platinum dispersion. Therefore, the bifunctionality of the catalysts, measured as the metal/acid site ratio (Ψ parameter), was also correlated to the Al V species. Higher values of Ψ implied a higher resistance to deactivation, higher rates of toluene production, and an inhibition of benzene induced by the OSSGM.