SciELO - Scientific Electronic Library Online

 
vol.82 issue4Optimization of the process of immobilization of lipase produces by Marinobacter sp Ch27 in octadecilo - sepabead author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO

Share


Revista de la Sociedad Química del Perú

Print version ISSN 1810-634X

Abstract

UNSIHUAY, Daisy; PICASSO, Gino  and  SUN KOU, Rosario. Synthesis of catalysts based on Ni-Ti mixed oxides for the production of ethylene from catalytic dehydrogenation of ethane. Rev. Soc. Quím. Perú [online]. 2016, vol.82, n.4, pp.491-504. ISSN 1810-634X.

Catalysts based on titanium doped nickel oxides Ni1-αTiαO with α from 0.01 to 0.05, were prepared by a controlled evaporation method at 550 °C for selective oxidative dehydrogenation (ODH) of ethane to ethylene. The introduction of small amounts of Ti into the NiO lattice had noticeable effects on the nickel simple oxide properties, increasing the BET surface. In addition, it was observed a sustained depletion of crystallite size following XRD analysis, a generation of new acid sites, evaluated by NH3-TPD, a redistribution of reducible species to lower and higher temperatures studied from H2-TPR profile and a depression of nonstoichiometric oxygen with the increasing composition of titanium detected by O2-TPD. The catalytic tests were carried out under steady state conditions at a constant W/F of 0.48 g.s/ mL in order to evaluate the conversion and modifying W/F from 0.24 to 0.48 g.s/mL, to quantify the selectivity to ethylene. In all the Ni1-αTiαO catalysts, the catalytic tests revealed a positive doping effect of Ti in the performance of the samples, improving the ethane conversion and selectivity levels to ethylene, in comparison to the pure NiO. The sample Ni0.95Ti0.05O achieved the best selectivity to ethylene (77%) at a moderated ethane conversion of 35%, probably due to the increasing of the nucleophilic species of surface oxygen.

Keywords : ODH; ethane; Ti-doped NiO; ethylene selectivity.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )