Synthesis and Physico-Chemical Characterization of CeO2/ZrO2-SO4(2-) Mixed Oxides

Environmentally friendly solid-acid catalysts CeO2/ZrO2-SO4(2-) were prepared by the sol gel method varying CeO2 content (10, 20 and 30 wt%) and using sulfation in situ, maintaining the sulfate ions amount present in the materials at 20 wt%. ZrO2 and ZrO2-SO4(2-)were also prepared for comparison proposes using the same synthesis method. The materials were characterized by X-ray diffraction, nitrogen physisorption, potentiometric titration with n-butylamine, decomposition of 2-propanol and n-pentane isomerization. The specific surface area of ZrO2-SO4(2-) was high (160 m²/g) compared with the unmodified ZrO2 (80 m²/g), however this area decreased with increasing the CeO2 content (37-100 m²/g). There was no significant effect of CeO2 on the tetragonal structure of ZrO2-SO4(2-). The variation of acid sites amount runs parallel to the change of specific surface area. The acid sites amount decreased with increasing cerium oxide content. The decomposition of 2-propanol results fundamentally in the formation of dehydration products such as propylene and diisopropyl ether, both involving acid sites. In addition, a good performance during the n-pentane isomerization was observed for these materials. The selectivity towards isopentane reaches 84% when the Pt/CeO2/ZrO2-SO4(2-) catalyst with the highest CeO2 content was used.

Bibliographic Details

Main Authors:	Hernández-Enríquez,Juan Manuel, Silva-Rodrigo,Rebeca, García-Alamilla,Ricardo, García-Serrano,Luz Arcelia, Handy,Brent Edward, Cárdenas-Galindo,Guadalupe, Cueto-Hernández,Arturo
Format:	Digital revista
Language:	English
Published:	Sociedad Química de México A.C. 2012
Online Access:	http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1870-249X2012000200005
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